Edgar Filing: Allied World Assurance Co Holdings, AG

Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

Form 10-K

(Mark One)

þ	ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2012

¨	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number: 001-32938

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

(Exact Name of Registrant as Specified in Its Charter)


Switzerland		98-0681223
(State or Other Jurisdiction of		(I.R.S. Employer
Incorporation or Organization)		Identification No.)

Lindenstrasse 8 6340 Baar Zug, Switzerland

(Address of Principal Executive Offices and Zip Code)

41-41-768-1080

(Registrant’s Telephone Number, Including Area Code)

Securities registered pursuant to Section 12(b) of the Act:


Title of Each Class		Name of Each Exchange on Which Registered
Common Shares, par value CHF 12.64 per share		New York Stock Exchange, Inc.

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes þ No ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ¨ No þ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes þ No ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrant’s knowledge, in the definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. þ

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):


Large accelerated filer þ	Accelerated filer ¨	Non-accelerated filer ¨	Smaller reporting company ¨
	(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ¨ No þ

The aggregate market value of voting and non-voting common shares held by non-affiliates of the registrant as of June 29, 2012 (the last business day of the registrant’s most recently completed second fiscal quarter) was approximately $2.8 billion based on the closing sale price of the registrant’s common shares on the New York Stock Exchange on that date.

As of February 18, 2013, 34,541,409 common shares were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

The registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A with respect to the annual general meeting of the shareholders of the registrant scheduled to be held on May 2, 2013 is incorporated in Part III of this Form 10-K.

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

TABLE OF CONTENTS


		Page
PART I
ITEM 1.	Business		1
ITEM 1A.	Risk Factors		26
ITEM 1B.	Unresolved Staff Comments		50
ITEM 2.	Properties		57
ITEM 3.	Legal Proceedings		57
ITEM 4.	Mine Safety Disclosures		57

PART II
ITEM 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities		58
ITEM 6.	Selected Financial Data		61
ITEM 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		63
ITEM 7A.	Quantitative and Qualitative Disclosures About Market Risk		115
ITEM 8.	Financial Statements and Supplementary Data		118
ITEM 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure		118
ITEM 9A.	Controls and Procedures		118
ITEM 9B.	Other Information		121

PART III
ITEM 10.	Directors, Executive Officers and Corporate Governance		121
ITEM 11.	Executive Compensation		121
ITEM 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters		121
ITEM 13.	Certain Relationships and Related Transactions, and Director Independence		121
ITEM 14.	Principal Accountant Fees and Services		121

PART IV
ITEM 15.	Exhibits and Financial Statement Schedules		121
SIGNATURES			122
EXHIBITS			E-1
CONSOLIDATED FINANCIAL STATEMENTS			F-1

PART I

References in this Annual Report on Form 10-K to the terms “we,” “us,” “our,” “the company” or other similar terms mean the consolidated operations of Allied World Assurance Company Holdings, AG, a Swiss holding company, and our consolidated subsidiaries, unless the context requires otherwise. References in this Form 10-K to the terms “Allied World Switzerland” or “Holdings” means only Allied World Assurance Company Holdings, AG. References to our “insurance subsidiaries” may include our reinsurance subsidiaries. References in this Form 10-K to $ are to the lawful currency of the United States and to CHF are to the lawful currency of Switzerland. References in this Form 10-K to Holdings’ “common shares” means its registered voting shares. For your convenience, we have included a glossary beginning on page 51 of selected insurance and reinsurance terms.

Item 1.

Business.

Overview

We are a Swiss-based insurance and reinsurance company that underwrites a diverse portfolio of property and casualty lines of business through offices located in Bermuda, Hong Kong, Ireland, Singapore, Switzerland, the United Kingdom and the United States. For the year ended December 31, 2012, our U.S. insurance, international insurance and reinsurance segments accounted for 42.7%, 24.7% and 32.6%, respectively, of our total gross premiums written of $2,329.3 million. As of December 31, 2012, we had $12.0 billion of total assets and $3.3 billion of shareholders’ equity.

We were formed in Bermuda in 2001, and we redomesticated to Switzerland in December 2010, at which time Holdings became the ultimate parent company of Allied World Assurance Company Holdings, Ltd, the former publicly-traded Bermuda holding company (“Allied World Bermuda”) and its subsidiaries. Since our formation, we have focused primarily on the direct insurance markets. We offer our clients and producers significant capacity in both the direct property and casualty insurance markets as well as in the reinsurance market. We have expanded since our formation and now have 17 offices located in seven different countries.

Internationally, we first established a presence in Europe when Allied World Assurance Company (Europe) Limited was approved to carry on business in the European Union (“E.U.”) from its office in Dublin, Ireland in October 2002 and from a branch office in London, England in May 2003. Allied World Assurance Company (Reinsurance) Limited was approved to write reinsurance in the E.U. from its office in Ireland in July 2003 and from a branch office in London, England in August 2004. In recent years, we have further expanded our European presence, first in October 2008 when Allied World Assurance Company (Reinsurance) Limited opened a branch office in Zug, Switzerland to further penetrate the European market, and later in March 2011 when we received an insurance and reinsurance license for Allied World Assurance Company, AG, a Swiss-domiciled company located in Zug, Switzerland.

In July 2002, we established a presence in the United States when we acquired two insurance companies, Allied World Assurance Company (U.S.) Inc. and Allied World National Assurance Company. We have made substantial investments to expand our North American business, which has grown significantly since 2009 and which we expect will continue to grow in size and importance in the coming years. In February 2008, we acquired a U.S. reinsurance company which we operated under the name Allied World Reinsurance Company until December 2012, when it was renamed Allied World Insurance Company. We write our U.S. reinsurance business through this company. In October 2008, we acquired Darwin Professional Underwriters, Inc. and its subsidiaries (collectively, “Darwin”) to further expand our U.S. insurance platform. We currently have eleven offices in the United States and are licensed in Canada.

Our corporate expansion continued into Asia when Allied World Assurance Company, Ltd opened branch offices in Hong Kong in March 2009 and in Singapore in December 2009. In July 2011, we received a license to write reinsurance business in Labuan, a financial center in Malaysia.

In early 2010, we received approval from Lloyd’s to establish a syndicate. Our Lloyd’s syndicate, Syndicate 2232, commenced underwriting in June 2010. Syndicate 2232 is managed by Capita Managing Agency Limited, a subsidiary of The Capita Group PLC, which is authorized by the Financial Services Authority in the United

Kingdom (the “FSA”). In July 2010, we received approval from the Monetary Authority of Singapore and Lloyd’s Asia to register and operate a service company, Capita 2232 Services Pte Ltd. As part of the Lloyd’s Asia platform, the service company underwrites exclusively on behalf of Syndicate 2232. Syndicate 2232, via the service company, offers a broad range of insurance and reinsurance treaty products from Singapore, including property, casualty and specialty lines, to clients in the Asia Pacific, Middle East and Africa regions. In September 2012, Allied World Reinsurance Management Company received approval to act as a Lloyd’s coverholder to underwrite Latin American and Caribbean treaty business from our Miami office on behalf of Syndicate 2232.

Available Information

We maintain a website at www.awac.com. The information on our website is not incorporated by reference in this Annual Report on Form 10-K.

We make available, free of charge through our website, our financial information, including the information contained in our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as soon as reasonably practicable after we electronically file such material with, or furnish such material to, the U.S. Securities and Exchange Commission (the “SEC”). We also make available, free of charge through our website, our Audit Committee Charter, Compensation Committee Charter, Investment Committee Charter, Nominating & Corporate Governance Committee Charter, Enterprise Risk Committee Charter, Corporate Governance Guidelines, Code of Ethics for CEO and Senior Financial Officers and Code of Business Conduct and Ethics. Such information is also available in print for any shareholder who sends a request to Allied World Assurance Company Holdings, AG, Lindenstrasse 8, 6340 Baar, Zug, Switzerland, attention: Wayne H. Datz, Corporate Secretary, or via e-mail to secretary@awac.com. Reports and other information we file with the SEC may also be viewed at the SEC’s website at www.sec.gov or viewed or obtained at the SEC Public Reference Room at 100 F Street, N.E., Washington, DC 20549. Information on the operation of the SEC Public Reference Room may be obtained by calling the SEC at 1-800-SEC-0330.

Our Strategy

Our business objective is to generate attractive returns on equity and book value per share growth for our shareholders. We seek to achieve this objective by executing the following strategies:

•

Capitalize on profitable underwriting opportunities. Our experienced management and underwriting teams are positioned to locate and identify business with attractive risk/reward characteristics. We pursue a strategy that emphasizes profitability, not market share. Key elements of this strategy are prudent risk selection, appropriate pricing and adjusting our business mix to remain flexible and opportunistic. We seek ways to take advantage of underwriting opportunities that we believe will be profitable.

•

Exercise underwriting and risk management discipline. We believe we exercise underwriting and risk management discipline by: (i) maintaining a diverse spread of risk across product lines and geographic zones, (ii) managing our aggregate property catastrophe exposure through the application of sophisticated modeling tools, (iii) monitoring our exposures on non-property catastrophe coverages, (iv) adhering to underwriting guidelines across our business lines and (v) fostering a culture that focuses on enterprise risk management and strong internal controls.

•

Maintain a conservative investment strategy. We believe that we follow a conservative investment strategy designed to emphasize the preservation of our capital and provide adequate liquidity for the prompt payment of claims. Our investment portfolio consists primarily of investment-grade, fixed-maturity securities of short-to medium-term duration.

Our premium revenues are generated by operations conducted from our corporate headquarters in Switzerland and our other offices in Bermuda, Europe, Hong Kong, Singapore and the United States. For information concerning our gross premiums written by geographic location of underwriting office, see Item 7.

“Management’s Discussion and Analysis of Financial Condition and Results of Operations — Results of Operations — Comparison of Years Ended December 31, 2012 and 2011” and “— Comparison of Years Ended December 31, 2011 and 2010.”

Our Operating Segments

We have three business segments: U.S. insurance, international insurance and reinsurance. These segments and their respective lines of business and products may, at times, be subject to different underwriting cycles. We modify our product strategy as market conditions change and new opportunities emerge by developing new products, targeting new industry classes or de-emphasizing existing lines. Our diverse underwriting skills and flexibility allow us to concentrate on the business lines where we expect to generate the greatest returns. Financial data relating to our three segments is included in Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in our consolidated financial statements included in this report.

The gross premiums written in each segment for the years ended December 31, 2012. 2011 and 2010 were as follows:


	Year Ended December 31, 2012					Year Ended December 31, 2011					Year Ended December 31, 2010
	Amount		% of Total			Amount		% of Total			Amount		% of Total
	($ in millions)
U.S. insurance	$	993.9		42.7	%	$	838.6		43.3	%	$	729.3		41.5	%
International insurance		575.1		24.7	%		530.4		27.3	%		504.9		28.7	%
Reinsurance		760.3		32.6	%		570.5		29.4	%		524.2		29.8	%

Total	$	2,329.3		100.0	%	$	1,939.5		100.0	%	$	1,758.4		100.0	%

U.S. Insurance Segment

General

The U.S. insurance segment includes our direct insurance operations in the United States. Within this segment we provide an increasingly diverse range of specialty liability products, with a particular emphasis on coverages for healthcare and professional liability risks. Additionally, we offer a selection of direct general casualty insurance and general property insurance products. We generally target small- and middle-market, non-Fortune 1000 accounts domiciled in North America, including public entities, private companies and non-profit organizations. In recent years we have enhanced our U.S. insurance operating platform, principally through hiring underwriting talent, through an expanded network of branch offices located in strategically important locations across the country and through upgrades to our information technology platform to accommodate our increasing business demands. Our underwriters are spread among our locations in the United States because we believe it is important to be physically present in the major insurance markets where we compete for business. We believe improvements to our operating platform have allowed us to assume and maintain a significant role as a writer of primary professional liability and other specialty liability coverage for small firms. We will continue to seek attractive opportunities in the U.S. market.

The table below illustrates the breakdown of the company’s U.S. direct insurance gross premiums written by line of business for the year ended December 31, 2012.


	Year Ended December 31, 2012
	Amount		% of Total
	($ in millions)
General casualty	$	269.6		27.1	%
Professional liability		260.8		26.2	%
Healthcare		207.3		20.9	%
Programs		105.3		10.6	%
General property		94.3		9.5	%
Other(1)		56.6		5.7	%

	$	993.9		100.0	%

(1)	Includes our inland marine, environmental and mergers and acquisitions lines of business.

Products and Customer Base

Our casualty operations in the United States focus on insurance products providing coverage for specialty type risks, such as professional liability, environmental liability, product liability, and healthcare liability risks, and we offer commercial general liability products as well. Professional liability products include policies covering directors and officers, employment practices and fiduciary liability insurance. We also offer a diverse mix of errors and omissions liability coverages for a variety of service providers, including law firms, technology companies, insurance companies, insurance agents and brokers, and municipalities. We also provide both primary and excess liability and other casualty coverages to the healthcare industry, including hospitals and hospital systems, managed care organizations, accountable care organizations and medical facilities such as home care providers, specialized surgery and rehabilitation centers, and outpatient clinics. We regularly assess our product mix, and we evaluate new products and markets where we believe our underwriting and service will allow us to differentiate our offerings.

In late 2009, we commenced writing environmental liability business by offering a line of environmental casualty products covering the pollution and related liability exposures of general contractors, tank installers, remediation contractors and others. During 2012, we introduced new coverages for mergers and acquisitions liability, privacy and technology liability.

With respect to general casualty products, we provide both primary and excess liability coverage, and our focus is on complex risks in a variety of industries including construction, real estate, public entities, retailers, manufacturing, transportation, and finance and insurance services. We also offer comprehensive insurance to contractors and their employees working outside of the United States on contracts for agencies of the U.S. government or foreign operations of U.S. companies.

Our U.S. property insurance operations provide direct coverage of physical property and business interruption coverage for commercial property risks. During 2011, we also commenced writing inland marine business. We write solely commercial coverages and concentrate our efforts on primary risk layers of insurance (as opposed to excess layers), offering meaningful but limited capacity in these layers. This means that we are typically part of the first group of insurers that cover a loss up to a specified limit. We offer general property products from our underwriting platforms in the United States, and cover risks for retail chains, real estate, manufacturers, hotels and casinos, and municipalities.

We currently have a total of 12 insurance programs in the United States, offering a variety of products including professional liability, excess casualty and primary general liability. We generally retain responsibility for administration of claims, although we may opt to outsource claims in selected situations. In selecting program

administrators, we consider the integrity, experience and reputation of the program administrator, the availability of reinsurance and the potential profitability of the business. In order to assure the continuing integrity of the underwriting and related business operations in our program business, we conduct additional reviews and audits of the program administrator. To help align our interests with those of our program administrators, we seek to set up incentive-based compensation to encourage better long-term underwriting results as a component of their fees.

For more information concerning our gross premiums written by line of business in our U.S. insurance segment, see Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Results of Operations — U.S. Insurance Segment — Comparison of Years Ended December 31, 2012 and 2011” and “— Comparison of Years Ended December 31, 2011 and 2010.”

Distribution

Within our U.S. insurance segment, insurance policies are placed through a network of over 200 insurance intermediaries, including excess and surplus lines wholesalers and regional and national retail brokerage firms. A subset of these intermediaries also access certain of our U.S. casualty products via our proprietary i-bind platform that allows for accelerated quote and bind capabilities through the internet. Marsh & McLennan Companies, Inc. (“Marsh”) accounted for approximately 10% of gross premiums written in the U. S. insurance segment during 2012.

International Insurance Segment

General

The international insurance segment includes our direct insurance operations outside of the United States. It includes our operations in Bermuda, Europe and Asia. Our Bermuda operations underwrite primarily larger, Fortune 1000 casualty and property risks for accounts domiciled in North America. Our insurance operations in Europe, with offices in Dublin, London and Switzerland, have focused on mid-sized to large European and multi-national companies domiciled outside of North America, and we are also diversifying into insurance products for smaller commercial clients. In addition, Syndicate 2232 offers select product lines including international property, general casualty and professional liability, targeted at key territories such as countries in Latin America and the Asia Pacific region. The international insurance segment also encompasses our offices in Asia that underwrite a variety of primary and excess professional liability lines and general casualty and healthcare insurance products. Our staff in the international insurance segment is spread among our locations in Bermuda, Europe and Asia because we believe it is important that our underwriters be physically present in the major insurance markets around the world where we compete for business.

The table below illustrates the breakdown of the company’s international insurance gross premiums written by line of business for the year ended December 31, 2012.


	Year Ended December 31, 2012
	Amount		% of Total
	($ in millions)
Professional liability	$	182.0		31.7	%
General property		157.2		27.3	%
General casualty		131.6		22.9	%
Healthcare		73.2		12.7	%
Other		31.1		5.4	%

	$	575.1		100.0	%

Products and Customer Base

Our casualty operations within our international insurance provide general casualty products; professional liability products such as directors and officers, employment practices, fiduciary and errors and omissions liability insurance; and healthcare liability products. Our focus with respect to general casualty products is on complex risks in a variety of industries, including manufacturing, energy, chemicals, transportation, real estate, consumer products, medical and healthcare services and construction. We also offer a diverse mix of coverages for a number of industries including law firms, technology companies, financial institutions, insurance companies and brokers, manufacturing and energy, and engineering and construction firms. Our healthcare underwriters provide risk transfer products to numerous healthcare institutions, such as hospitals, managed care organizations and healthcare systems. We offer both primary and excess coverage, with the latter focused primarily on insuring excess layers, with a median attachment point of $80 million. Our international insurance segment utilizes significant gross limit capacity.

We offer general property products from our underwriting platforms in Bermuda and Europe. Our international property insurance operations provide direct coverage of physical property and business interruption coverage for commercial property risks and mining risks. We write solely commercial coverages and focus on the insurance of the primary risk layer. The types of commercial property risks we cover include retail chains, real estate, manufacturers, hotels and casinos.

In 2010, we commenced writing trade credit insurance by offering short- and medium-term credit insurance for clients that export primarily to and from Latin America and the Caribbean.

For more information on our gross premiums written by line of business in our international insurance segment, see Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Results of Operations — International Insurance Segment — Comparison of Years Ended December 31, 2012 and 2011” and “— Comparison of Years Ended December 31, 2011 and 2010.”

Distribution

With regard to our international insurance segment, we utilize our relationships with insurance intermediaries as our principal method for obtaining business. Our international insurance segment maintains significant relationships with Marsh, Aon Corporation (“Aon”) and Willis Group Holdings (“Willis”), which accounted for 29%, 25% and 11%, respectively, of our gross premiums written in this segment during 2012.

Reinsurance Segment

General

Our reinsurance segment includes the reinsurance of property, general casualty, professional liability, specialty lines and property catastrophe coverages written by other insurance companies. In order to diversify our portfolio and complement our direct insurance business, we target the overall contribution from reinsurance to be approximately 30% of our total annual gross premiums written.

We presently write reinsurance on both a treaty and a facultative basis, targeting several niche markets including professional liability lines, specialty casualty, property for U.S. regional insurers, accident and health, marine, aerospace and crop risks. Overall, we strive to diversify our reinsurance portfolio through the appropriate combination of business lines, ceding source, geography and contract configuration. Our primary customer focus is on highly-rated carriers with proven underwriting skills and dependable operating models.

We determine appropriate pricing either by using pricing models built or approved by our actuarial staff or by relying on established pricing set by one of our pricing actuaries for a specific treaty. Pricing models are generally used for facultative reinsurance, property catastrophe reinsurance, property per risk reinsurance and workers compensation and personal accident catastrophe reinsurance. Other types of reinsurance rely on actuarially-established pricing. On a written basis, our business mix is more heavily weighted to reinsurance during the first three months of the year. Our reinsurance segment operates from our offices in Bermuda, London, Miami, New York, Singapore and Switzerland.

The table below illustrates the breakdown of the company’s reinsurance gross premiums written by line of business for the year ended December 31, 2012.


	Year Ended December 31, 2012
	Amount		% of Total
	($ in millions)
Property	$	354.6		46.7	%
Casualty		254.3		33.4	%
Specialty		151.4		19.9	%

	$	760.3		100.0	%

Product Lines and Customer Base

Property, casualty and specialty reinsurance is the principal source of revenue for this segment. The insurers we reinsure range from single state to nationwide insurers located in the United States as well as specialty carriers or the specialty divisions of standard lines carriers. For our international treaty unit, our clients include multi-national insurers, single territory insurers, niche carriers and Lloyd’s syndicates. We focus on niche programs and coverages, frequently sourced from excess and surplus lines insurers. In October 2008, we expanded our international reach by opening a branch office in Switzerland that offers property, general casualty and professional liability products throughout Europe. This business is now being written by Allied World Assurance Company, AG, our Swiss licensed insurance and reinsurance company. Syndicate 2232 also offers international treaty reinsurance. During 2009, we expanded our reinsurance operations both in Asia, where we opened a branch office in Singapore that serves as the company’s hub for all classes of treaty reinsurance business for the region, and in the United States, where we added a property underwriting team to our reinsurance platform. In December 2010, we expanded our specialty reinsurance offerings by launching a marine and specialty division. In 2011, we added crop reinsurance offerings. In September 2012, our Miami operations received approval to act as a Lloyd’s coverholder to underwrite treaty business in Latin America and the Caribbean on behalf of Syndicate 2232. We target a portfolio of well-rated companies that are highly knowledgeable in their product lines, have the financial resources to execute their business plans and are committed to underwriting discipline throughout the underwriting cycle.

Our property reinsurance underwrites treaties which protect insurers who write residential, commercial and industrial accounts in North America, Europe, Asia and Latin America. Our predominant exposure to loss is in North America. We also write Euro-centric business, including Lloyd’s syndicates and Continental European companies, and are expanding our capabilities in Asia and Latin America. We emphasize monoline, per risk accounts, which are structured as either quota share or excess-of-loss reinsurance. Monoline reinsurance applies to one kind of coverage, and per risk reinsurance coverage applies to a particular risk (for example a building and its contents), rather than on a per accident, event or aggregate basis. Where possible, coverage is provided on a “losses occurring” basis, which limits coverage to property losses occurring within the treaty year. We selectively write industry loss warranties where we believe market opportunities justify the risks.

Our casualty reinsurance business consists of general casualty and professional liability lines and writes both treaty and facultative business. Our general casualty treaties cover working layer, intermediate layer and catastrophe exposures. We sell both quota share and excess-of-loss reinsurance. We principally underwrite general liability, auto liability and commercial excess and umbrella liability for both admitted and non-admitted companies. Our general casualty facultative business is principally comprised of lower-attachment, individual-risk reinsurance covering automobile liability, general liability and workers compensation risks for many of the largest U.S. property-casualty and surplus lines insurers. Our professional liability treaties cover several products, primarily directors’ and officers’ liability, but also attorneys’ malpractice, medical malpractice, miscellaneous professional classes and transactional risk liability. The complex exposures undertaken by this unit demand highly technical underwriting and pricing analysis.

For our specialty reinsurance business, we underwrite on a global basis crop, marine and aviation, and other specialty lines of business, including accident and health business with an emphasis on catastrophe personal accident programs and workers compensation catastrophe business.

For more information on our gross premiums written by line of business in our reinsurance segment, see Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Results of Operations — Reinsurance Segment — Comparison of Years Ended December 31, 2012 and 2011” and “—Comparison of Years Ended December 31, 2011 and 2010.”

Distribution

Due to a number of factors, including transactional size and complexity, the distribution infrastructure of the reinsurance marketplace is characterized by relatively few intermediary firms. As a result, we have close business relationships with a small number of reinsurance intermediaries, and our business during 2012 was primarily with affiliates of Marsh, Aon and Willis accounting for 41%, 27% and 14%, respectively, of total gross premiums written in this segment during 2012. Due to the substantial percentage of premiums produced in our reinsurance segment by the top three intermediaries, the loss of business from any one of them could have a material adverse effect on our business.

Security Arrangements

Allied World Assurance Company, Ltd, our Bermuda insurance and reinsurance company, is not admitted as an insurer nor is it accredited as a reinsurer in any jurisdiction in the United States, although it is qualified as an “eligible” reinsurer in several U.S. states. Except in states where it has qualified as an eligible reinsurer, Allied World Assurance Company, Ltd is generally required to post collateral security with respect to any reinsurance liabilities it assumes from ceding insurers domiciled in the United States in order for these cedents to obtain credit on their U.S. statutory financial statements with respect to insurance liabilities ceded by them. Under applicable statutory provisions, the security arrangements may be in the form of letters of credit, reinsurance trusts maintained by trustees or funds-withheld arrangements where assets are held by the ceding company. For a description of the security arrangements used by us, see Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Liquidity and Capital Resources — Pledged Assets.”

Enterprise Risk Management

General

While the assumption of risk is inherent in our business, we believe we have developed a strong risk management culture that is fostered and maintained by our senior management. Our enterprise risk management (“ERM”) consists of numerous processes and controls that have been designed by our senior management, with oversight by our Board of Directors, including through its Enterprise Risk Committee, and implemented by employees across our organization. One key element of our ERM is our economic capital model. Utilizing this modeling framework, we review the relative interaction between risks impacting us from underwriting through investment risks. Our ERM supports our firm-wide decision making process by aiming to provide reliable and timely risk information. Our primary ERM objectives are to:

•

protect our capital position,

•

ensure that our assumed risks (individually and in the aggregate) are within our firm-wide risk appetite,

•

maximize our risk-adjusted returns on capital, and

•

manage our earnings volatility.

We have identified the following six major categories of risk within our business:

Underwriting risk: Encompasses risks associated with entering into insurance and reinsurance transactions and includes frequency and severity assessments, pricing adequacy issues and exposures posed by new products. For more information concerning our management of underwriting risk, see “Underwriting Risk Management” below.

Catastrophe and Aggregate Accumulation risk: Addresses the organization’s exposure to natural catastrophes, such as windstorms, earthquakes or floods, particularly with regard to managing the

concentration of exposed insurance limits within coastal or other areas that are more prone to severe catastrophic events. For more information concerning our management of catastrophe risk, see “Underwriting Risk Management” below.

Reserving risk: The risks associated with overestimating or underestimating required reserves is a significant risk for any company that writes long-tailed casualty business.

Investment risk: Addresses risks of market volatility and losses associated with individual investments and investment classes, as well as overall portfolio risk associated with decisions as to asset mix, geographic risk, duration and liquidity.

Reinsurance risk: The ceding of policies we write to other reinsurers is a principal risk management activity, and it requires careful monitoring of the concentration of our reinsured exposures and the creditworthiness of the reinsurers to which we cede business.

Operational risk: Encompasses a wide range of risks related to our operations, including: corporate governance, claims settlement processes, regulatory compliance, employment practices and IT exposures (including disaster recovery and business continuity planning).

Our risk governance structure includes committees comprised of senior underwriting, actuarial, finance, legal, investment and operations staff that identify, monitor and help manage each of these risks. Our management-based Risk Management Committee, chaired by our Chief Risk Officer, focuses primarily on identifying correlations among our primary categories of risk, developing metrics to assess our overall risk position, performing an annual risk assessment and reviewing continually factors that may impact our organizational risk. This risk governance structure is complemented by our internal audit department, which assesses the adequacy and effectiveness of our internal control systems and coordinates risk-based audits and compliance reviews and other specific initiatives to evaluate and address risk within targeted areas of our business. Our ERM is a dynamic process, with periodic updates being made to reflect organizational processes and the recalibration of our models, as well as staying current with changes within our industry and the global economic environment.

Our management’s internal ERM efforts are overseen by our Board of Directors, primarily through its Enterprise Risk Committee. This committee, comprised of independent directors, is charged with reviewing and recommending to the Board of Directors our overall firm-wide risk appetite as well as overseeing management’s compliance therewith. Our Enterprise Risk Committee reviews our risk management methodologies, standards, tolerances and risk strategies, and assesses whether management is addressing risk issues in a timely and appropriate manner. Our Audit Committee, Investment Committee and Compensation Committee also oversee aspects of our financial, investment and compensation risks, respectively. Internal controls and ERM can provide a reasonable but not absolute assurance that our control objectives will be met. The possibility of material financial loss remains in spite of our ERM efforts.

Underwriting Risk Management

Underwriting insurance and reinsurance coverage, which is our primary business activity, entails the assumption of risk. Therefore, protecting corporate assets from an unexpected level of loss related to underwriting activities is a major area of focus. We emphasize careful risk selection by evaluating a potential insured’s risk management practices, loss history and adequacy of retention. Other factors that go into the effective management of underwriting risk may differ depending on the line of business involved and the type of account being insured or reinsured.

In our direct insurance casualty products, we strive to write diverse business across a variety of product lines and industry classes, and we review business concentrations on a regular basis with the objective of creating balanced portfolios. By maintaining a balanced casualty portfolio, we believe we are less vulnerable to adverse market changes in any one product or industry. In addition, because of the large limits we often deploy for casualty business written in the U.S. insurance segment and the international insurance segment, we utilize both facultative and treaty reinsurance to reduce our net exposure. For more information on the reinsurance we purchase for the casualty business written in the U.S. insurance and international insurance segments, see Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Critical Accounting Policies — Ceded Reinsurance.”

In our direct insurance property products, we have historically managed our property catastrophe exposure by closely monitoring our policy limits in addition to utilizing complex risk models that analyze the locations covered by each insurance policy enabling us to obtain a more accurate assessment of our property catastrophe exposure. In addition to our continued focus on aggregate limits and modeled probable maximum loss, we have implemented a gross exposed policy limits approach that focuses on exposures in catastrophe-prone geographic zones and takes into consideration flood severity, demand surge and business interruption exposures for each critical area. We closely monitor our gross accumulations in each zone and restrict our gross exposed policy limits in each critical property catastrophe zone to an amount consistent with our probable maximum loss. Subsequent to a catastrophic event, we reassess our risk appetite and risk tolerances to ensure they are aligned with our capital preservation targets. Additionally, for our direct property, workers compensation, accident and health catastrophe and property reinsurance business, we seek to manage our risk exposure so that our probable maximum losses for a single catastrophe event, after all applicable reinsurance, in any “one-in-250-year” event does not exceed approximately 20% of our total capital.

Before we review the specifics of any proposal in our reinsurance segment, we consider the attributes of the client, including the experience and reputation of its management and its risk management strategy. We also examine the level of shareholders’ equity, industry ratings, length of incorporation, duration of business model, portfolio profitability, types of exposures and the extent of its liabilities. To identify, manage and monitor accumulations of exposures from potential property catastrophes, we employ industry-recognized software. Our underwriters, actuaries and claims personnel collaborate throughout the reinsurance underwriting process. For property proposals, we also obtain information on the nature of the perils to be included and the policy information on locations to be covered under the reinsurance contract. If a program meets our underwriting criteria, we then assess the adequacy of its proposed pricing, terms and conditions, and its potential impact on our profit targets and risk objectives.

Competition

The insurance and reinsurance industry is highly competitive. Insurance and reinsurance companies compete on the basis of many factors, including premium rates, general reputation and perceived financial strength, the terms and conditions of the products offered, ratings assigned by independent rating agencies, speed of claims payments and reputation and experience in risks underwritten.

We compete with major U.S. and non-U.S. insurers and reinsurers, many of which have greater financial, marketing and management resources than we do. Some of these companies have more capital than our company. In our direct insurance business, we compete with insurers that provide property and casualty-based lines of insurance such as: ACE Limited, Arch Capital Group Ltd., Axis Capital Holdings Limited, American International Group, Inc., The Chubb Corporation, Endurance Specialty Holdings Ltd., Factory Mutual Insurance Company, HCC Insurance Holdings, Inc., Ironshore Inc., Liberty Mutual Insurance Company, Lloyd’s, Markel Insurance Company, Munich Re Group, The Navigators Group, Inc., OneBeacon Insurance Group, Ltd, Swiss Reinsurance Company, W.R. Berkeley Corporation, XL Capital Ltd and Zurich Financial Services. In our reinsurance business, we compete with reinsurers that provide property and casualty-based lines of reinsurance such as: ACE Limited, Alterra Capital Holdings, Ltd, Arch Capital Group Ltd., Berkshire Hathaway, Inc., Everest Re Group, Ltd., Lloyd’s, Montpelier Re Holdings Ltd., Munich Re Group, PartnerRe Ltd., Platinum Underwriters Holdings, Ltd., RenaissanceRe Holdings Ltd., Swiss Reinsurance Company, Transatlantic Holdings, Inc. and XL Capital Ltd.

In addition, risk-linked securities, derivatives and other non-traditional risk transfer vehicles are being developed and offered by other parties, including entities other than insurance and reinsurance companies. The availability of these non-traditional products could reduce the demand for traditional insurance and reinsurance.

Our Financial Strength Ratings

Ratings are an important factor in establishing the competitive position of insurance and reinsurance companies. A.M. Best, Moody’s, Standard & Poor’s and Fitch Ratings have each developed a rating system to provide an opinion of an insurer’s or reinsurer’s financial strength and ability to meet ongoing obligations to its policyholders. Each rating reflects the rating agency’s opinion of the capitalization, management and sponsorship

of the entity to which it relates, and is neither an evaluation directed to investors in our common shares nor a recommendation to buy, sell or hold our common shares. A.M. Best ratings currently range from “A++” (Superior) to “F” (In Liquidation) and include 15 separate ratings categories. Moody’s maintains a letter scale rating system ranging from “Aaa” (Exceptional) to “C” (Lowest-rated) and includes 21 separate ratings categories. Standard & Poor’s maintains a letter scale rating system ranging from “AAA” (Extremely Strong) to “R” (under regulatory supervision) and includes 21 separate ratings categories. Fitch Ratings maintains a letter scale rating system ranging from “AAA” (Extremely Strong”) to “C” (Distressed) and includes 19 separate ratings categories. Our principal operating subsidiaries and their respective ratings from each rating agency are provided in the table below.

Subsidiary

Rated “A”
(Excellent) from
A.M. Best(1)

Rated “A2”
(Good) from
Moody’s(2)

Rated “A”
(Strong) from
Standard & Poor’s(3)

Rated “A”
(Strong) from
Fitch Ratings(4)

Allied World Assurance Company, Ltd

Allied World Assurance Company (U.S.) Inc.

Allied World National Assurance Company

Allied World Insurance Company

Darwin National Assurance Company

—

Darwin Select Insurance Company

—

Allied World Assurance Company, AG

—

Allied World Assurance Company (Europe) Limited

—

Allied World Assurance Company (Reinsurance) Limited

—

(1)	Third highest of 15 available ratings from A.M. Best.

(2)	Sixth highest of 21 available ratings from Moody’s.

(3)	Sixth highest of 21 available ratings from Standard & Poor’s.

(4)	Fifth highest of 19 available ratings from Fitch Ratings.

In addition to the above-named subsidiaries, we underwrite through our Lloyd’s Syndicate 2232. All Lloyd’s syndicates benefit from Lloyd’s central resources, including Lloyd’s brand, its network of global licenses and the central fund. As all of Lloyd’s policies are ultimately backed by this common security, a single market rating can be applied. A.M. Best has assigned Lloyd’s a financial strength rating of “A” (Excellent) and Standard & Poor’s and Fitch Ratings have assigned Lloyd’s a financial strength rating of “A+” (Strong). These ratings are subject to periodic review, and may be revised upward, downward or revoked, at the sole discretion of the rating agencies.

Reserve for Losses and Loss Expenses

We are required by applicable insurance laws and regulations in the countries in which we operate and accounting principles generally accepted in the United States (“U.S. GAAP”) to establish loss reserves to cover our estimated liability for the payment of all losses and loss expenses incurred with respect to premiums earned on the policies and treaties that we write. These reserves are balance sheet liabilities representing estimates of losses and loss expenses we are required to pay for insured or reinsured claims that have occurred as of or before the balance sheet date. It is our policy to establish these losses and loss expense reserves using prudent actuarial methods after reviewing all information known to us as of the date they are recorded. For more specific information concerning the statistical and actuarial methods we use to estimate ultimate expected losses and loss expenses, see Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Critical Accounting Policies — Reserve for Losses and Loss Expenses.”

The following tables show the development of gross and net reserves for losses and loss expenses, respectively. The tables do not present accident or policy year development data. Each table begins by showing

the original year-end reserves recorded at the balance sheet date for each of the years presented (“as originally estimated”). This represents the estimated amounts of losses and loss expenses arising in all prior years that are unpaid at the balance sheet date, including reserves for losses incurred but not reported (“IBNR”). The re-estimated liabilities reflect additional information regarding claims incurred prior to the end of the preceding financial year. A (redundancy) or deficiency arises when the re-estimation of reserves recorded at the end of each prior year is (less than) or greater than its estimation at the preceding year-end. The cumulative (redundancies) or deficiencies represent cumulative differences between the original reserves and the currently re-estimated liabilities over all prior years. Annual changes in the estimates are reflected in the consolidated statement of operations and comprehensive income for each year, as the liabilities are re-estimated.

The lower sections of the tables show the portions of the original reserves that were paid (claims paid) as of the end of subsequent years. This section of each table provides an indication of the portion of the re-estimated liability that is settled and is unlikely to develop in the future. For our quota share treaty reinsurance business, we have estimated the allocation of claims paid to applicable years based on a review of large losses and earned premium percentages.

Development of Reserve for Losses and Loss Expenses Cumulative Deficiency (Redundancy)

Gross Losses


	Year Ended December 31,
	2002			2003			2004			2005			2006			2007			2008(1)			2009			2010			2011			2012
	($ in thousands)
As Originally Estimated:	$	310,508		$	1,062,138		$	2,084,331		$	3,543,811		$	3,900,546		$	4,307,637		$	4,576,828		$	4,761,772		$	4,879,188		$	5,225,143		$	5,645,549
Liability Re-estimated as of:
One Year Later		253,691			981,713			1,961,172			3,403,274			3,622,721			3,484,894			4,290,335			4,329,254			4,557,847			4,991,161
Two Years Later		226,943			899,176			1,873,599			3,249,263			3,247,858			3,149,303			3,877,832			3,975,195			4,246,518
Three Years Later		217,712			845,162			1,733,707			2,894,460			2,911,300			2,791,110			3,576,846			3,670,311
Four Years Later		199,860			810,183			1,513,697			2,558,600			2,605,761			2,533,557			3,295,723
Five Years Later		205,432			704,666			1,306,220			2,315,913			2,432,597			2,300,062
Six Years Later		196,495			626,818			1,235,604			2,190,495			2,314,204
Seven Years Later		179,752			619,903			1,207,675			2,168,471
Eight Years Later		184,107			618,248			1,199,686
Nine Years Later		184,104			618,607
Ten Years Later		188,482
Cumulative (Redundancy)		(122,026	)		(443,531	)		(884,645	)		(1,375,340	)		(1,586,342	)		(2,007,575	)		(1,281,105	)		(1,091,461	)		(632,670	)		(233,982	)
Cumulative Claims Paid as of:
One Year Later		54,288			138,843			374,605			718,263			560,163			583,447			574,823			634,463			656,568			852,091
Two Years Later		83,465			237,949			574,399			1,154,901			1,002,503			943,879			1,089,540			1,036,171			1,242,079
Three Years Later		100,978			301,264			725,955			1,521,586			1,252,921			1,311,398			1,391,252			1,408,003
Four Years Later		124,109			372,187			842,931			1,662,811			1,531,899			1,469,345			1,680,698
Five Years Later		163,516			425,394			910,393			1,828,977			1,622,539			1,634,536
Six Years Later		184,691			456,652			971,953			1,864,908			1,705,920
Seven Years Later		195,688			478,055			994,769			1,916,912
Eight Years Later		201,516			499,459			1,031,853
Nine Years Later		149,044			514,810
Ten Years Later		156,529

(1)	Reserve for losses and loss expenses includes the reserves for losses and loss expenses of Finial Insurance Company (now renamed Allied World Insurance Company), which we acquired in February 2008, and Darwin, which we acquired in October 2008.

Development of Reserve for Losses and Loss Expenses Cumulative Deficiency (Redundancy)

Gross Losses


	Year Ended December 31,
	2002			2003			2004			2005			2006			2007			2008			2009			2010			2011
Liability Re-estimated as of:
One Year Later		82	%		92	%		94	%		96	%		93	%		81	%		94	%		91	%		93	%		96	%
Two Years Later		73	%		85	%		90	%		92	%		83	%		73	%		85	%		83	%		87	%
Three Years Later		70	%		80	%		83	%		82	%		75	%		65	%		78	%		77	%
Four Years Later		64	%		76	%		73	%		72	%		67	%		59	%		72	%
Five Years Later		66	%		66	%		63	%		65	%		62	%		53	%
Six Years Later		63	%		59	%		59	%		62	%		59	%
Seven Years Later		58	%		58	%		58	%		61	%
Eight Years Later		59	%		58	%		58	%
Nine Years Later		59	%		58	%
Ten Years Later		61	%
Cumulative (Redundancy)		(39	%)		(42	%)		(42	%)		(39	%)		(41	%)		(47	%)		(28	%)		(23	%)		(13	%)		(4	%)

Gross Loss and Loss Expense Cumulative Paid as a Percentage of Originally Estimated Liability
Cumulative Claims Paid as of:
One Year Later		17	%		13	%		18	%		20	%		14	%		14	%		13	%		13	%		13	%		16	%
Two Years Later		27	%		22	%		28	%		33	%		26	%		22	%		24	%		22	%		25	%
Three Years Later		33	%		28	%		35	%		43	%		32	%		30	%		30	%		30	%
Four Years Later		40	%		35	%		40	%		47	%		39	%		34	%		37	%
Five Years Later		53	%		40	%		44	%		52	%		42	%		38	%
Six Years Later		59	%		43	%		47	%		53	%		44	%
Seven Years Later		63	%		45	%		48	%		54	%
Eight Years Later		65	%		47	%		50	%
Nine Years Later		48	%		48	%
Ten Years Later		50	%

Development of Reserve for Losses and Loss Expenses Cumulative Deficiency (Redundancy)

Losses Net of Reinsurance


	Year Ended December 31,
	2002			2003			2004			2005			2006			2007			2008(1)			2009			2010			2011			2012
	($ in thousands)
As Originally Estimated:	$	299,946		$	967,305		$	1,809,588		$	2,826,930		$	3,211,441		$	3,624,872		$	3,688,514		$	3,841,781		$	3,951,600		$	4,222,224		$	4,504,439
Liability Re-estimated as of:
One Year Later		243,129			887,870			1,760,469			2,662,723			2,978,320			3,312,248			3,440,522			3,528,426			3,698,072			4,051,875
Two Years Later		216,381			833,496			1,655,675			2,551,946			2,699,585			3,032,063			3,128,342			3,255,966			3,474,313
Three Years Later		207,945			773,967			1,551,115			2,281,007			2,416,966			2,742,484			2,882,645			3,020,003
Four Years Later		191,471			746,355			1,353,988			1,986,782			2,152,221			2,518,524			2,655,736
Five Years Later		197,656			648,469			1,162,263			1,776,483			1,997,008			2,326,535
Six Years Later		188,733			574,803			1,098,702			1,663,577			1,895,963
Seven Years Later		172,219			568,273			1,075,318			1,644,204
Eight Years Later		176,582			566,975			1,067,080
Nine Years Later		176,579			567,803
Ten Years Later		180,956
Cumulative (Redundancy)		(118,990	)		(399,502	)		(742,508	)		(1,182,726	)		(1,315,478	)		(1,298,337	)		(1,032,778	)		(821,778	)		(477,287	)		(170,349	)
Cumulative Claims Paid as of:
One Year Later		52,077			133,336			306,865			461,310			377,250			415,214			415,902			498,084			542,649			743,844
Two Years Later		76,843			214,939			482,038			759,276			698,959			681,332			811,697			843,697			1,050,845
Three Years Later		93,037			272,028			624,894			990,514			884,077			964,790			1,069,303			1,171,454
Four Years Later		116,494			342,898			733,286			1,090,679			1,094,011			1,099,963			1,318,773
Five Years Later		155,904			407,712			783,091			1,219,997			1,167,580			1,244,936
Six Years Later		172,974			426,354			833,918			1,248,296			1,241,493
Seven Years Later		176,390			440,812			851,312			1,293,137
Eight Years Later		177,880			455,271			883,239
Nine Years Later		141,507			467,305
Ten Years Later		145,698

(1)	Reserve for losses and loss expenses net includes the reserves for losses and loss expenses of Finial Insurance Company (now renamed Allied World Insurance Company), which we acquired in February 2008, and Darwin, which we acquired in October 2008.

Development of Reserve for Losses and Loss Expenses Cumulative Deficiency (Redundancy)

Losses Net of Reinsurance


	Year Ended December 31,
	2002			2003			2004			2005			2006			2007			2008			2009			2010			2011
Liability Re-estimated as of:
One Year Later		81	%		92	%		97	%		94	%		93	%		91	%		93	%		92	%		94	%		96	%
Two Years Later		72	%		86	%		91	%		90	%		84	%		84	%		85	%		85	%		88	%
Three Years Later		69	%		80	%		86	%		81	%		75	%		76	%		78	%		79	%
Four Years Later		64	%		77	%		75	%		70	%		67	%		69	%		72	%
Five Years Later		66	%		67	%		64	%		63	%		62	%		64	%
Six Years Later		63	%		59	%		61	%		59	%		59	%
Seven Years Later		57	%		59	%		59	%		58	%
Eight Years Later		59	%		59	%		59	%
Nine Years Later		59	%		59	%
Ten Years Later		60	%
Cumulative (Redundancy)		(40	%)		(41	%)		(41	%)		(42	%)		(41	%)		(36	%)		(28	%)		(21	%)		(12	%)		(4	%)

Net Loss and Loss Expense Cumulative Paid as a Percentage of Originally Estimated Liability
Cumulative Claims Paid as of:
One Year Later		17	%		14	%		17	%		16	%		12	%		11	%		11	%		13	%		14	%		18	%
Two Years Later		27	%		22	%		27	%		27	%		22	%		19	%		22	%		22	%		27	%
Three Years Later		33	%		28	%		35	%		35	%		28	%		27	%		29	%		30	%
Four Years Later		40	%		35	%		41	%		39	%		34	%		30	%		36	%
Five Years Later		53	%		42	%		43	%		43	%		36	%		34	%
Six Years Later		59	%		44	%		46	%		44	%		39	%
Seven Years Later		63	%		46	%		47	%		46	%
Eight Years Later		65	%		47	%		49	%
Nine Years Later		48	%		48	%
Ten Years Later		49	%

Losses Net of Reinsurance

The table below is a reconciliation of the beginning and ending liability for unpaid losses and loss expenses for the years ended December 31, 2012, 2011 and 2010. Losses incurred and paid are reflected net of reinsurance recoveries.


	Year Ended December 31,
	2012			2011			2010
	($ in millions)
Net reserves for losses and loss expenses, January 1	$	4,222.2		$	3,951.6		$	3,841.8
Incurred related to:
Commutation of variable rated reinsurance contracts		—			11.5			8.9
Current year non-catastrophe		1,130.0			909.0			913.9
Current year property catastrophe		179.6			292.2			98.4
Prior year		(170.3	)		(253.5	)		(313.3	)

Total incurred		1,139.3			959.2			707.9

Paid related to:
Current year non-catastrophe		99.1			72.1			61.0
Current year property catastrophe		18.1			70.1			37.6
Prior year		743.8			542.6			498.1

Total paid		861.0			684.8			596.7
Foreign exchange revaluation		3.9			(3.8	)		(1.4	)

Net reserve for losses and loss expenses, December 31		4,504.4			4,222.2			3,951.6
Losses and loss expenses recoverable		1,141.1			1,002.9			927.6

Reserve for losses and loss expenses, December 31	$	5,645.5		$	5,225.1		$	4,879.2

Investments

Investment Strategy and Guidelines

We believe that we follow a conservative investment strategy designed to emphasize the preservation of our invested assets and provide adequate liquidity for the prompt payment of claims. To help ensure adequate liquidity for payment of claims, we take into account the maturity and duration of our investment portfolio and our general liability profile. In making investment decisions, we consider the impact of various catastrophic events to which we may be exposed. As of December 31, 2012, investment grade, fixed-maturity securities and cash and cash equivalents, represented 77% of our total investments and cash and cash equivalents, with the remainder invested in non-investment grade securities and loans, equities, hedge funds and other alternative investments. Our current Investment Policy Statement contains restrictions on the maximum amount of our investment portfolio that may be invested in alternative investments (such as hedge funds and private equity vehicles) as well as a minimum amount that must be maintained in investment grade fixed income securities and cash. Beginning in 2012, two new subsidiaries (Allied World Financial Services, Ltd and Allied World Financial Services, Inc., collectively, “AWFS”) invest in nonpublic entities that we believe will complement our core insurance and reinsurance operations and diversify our revenues. These investments do not and are not expected to represent a material part of the company’s total investment portfolio.

In an effort to meet business needs and mitigate risks, our investment guidelines provide restrictions on our portfolio’s composition, including limits on the type of issuer, sector limits, credit quality limits, portfolio duration, limits on the amount of investments in approved countries and permissible security types. We may direct our investment managers to invest some of the investment portfolio in currencies other than the U.S. dollar based on the business we have written, the currency in which our loss reserves are denominated on our books or regulatory requirements.

Our investment performance is subject to a variety of risks, including risks related to general economic conditions, market volatility, interest rate fluctuations, liquidity risk and credit and default risk. Investment guideline restrictions have been established in an effort to minimize the effect of these risks but may not always be effective due to factors beyond our control. Interest rates are highly sensitive to many factors, including governmental monetary and fiscal policies, domestic and international economic and political conditions and other factors beyond our control. A significant increase in interest rates could result in significant losses, realized or unrealized, in the value of our investment portfolio. Similarly, given our portfolio’s exposure to credit assets, a significant increase in credit spreads could result in significant losses to our investment portfolio. Additionally, with respect to some of our investments, we are subject to prepayment and therefore reinvestment risk. Alternative investments, such as our hedge fund and private equity investments, subject us to restrictions on sale, transfer and redemption, which may limit our ability to withdraw funds or realize gains on such investments for some period of time after our initial investment. The values of, and returns on, such investments may also be more volatile.

Investment Committee and Investment Managers

The Investment Committee of our Board of Directors has approved an Investment Policy Statement that contains investment guidelines and supervises our investment activity. The Investment Committee regularly monitors our overall investment results and compliance with investment objectives and guidelines, and ultimately reports our overall investment results to the Board of Directors.

For our fixed income assets and loans we have engaged six outside investment managers to provide us with certain discretionary investment management services. We have agreed to pay investment management fees based on the market values of the investments in the portfolio. The fees, which vary depending on the amount of assets under management, are included as a deduction to net investment income. These investment management agreements may generally be terminated by either party upon 30 days prior written notice.

Our Portfolio

Composition as of December 31, 2012

As of December 31, 2012, we had total investments and cash and cash equivalents of $8.8 billion, including restricted cash, fixed-maturity securities, equity securities, hedge fund, private equity investments and other securities. The average credit quality of our investments is rated AA—by Standard & Poor’s and Aa3 by Moody’s. Short-term instruments must be rated a minimum of A-1, F-1 or P-1 by Standard & Poor’s, Moody’s or Fitch. The target duration range is 1.00 to 4.25 years. The portfolio has a total return rather than income orientation. The average duration of our investment portfolio was 2.1 years as of December 31, 2012.

The following table shows the types of securities in our portfolio, their fair market values, average rating and portfolio percentage as of December 31, 2012.


	Fair Value		Average Rating		Portfolio Percentage
	($ in millions)
Type of Investment
Cash and cash equivalents	$	865.4		AAA		9.8	%
U.S. government securities		1,529.2		AA+		17.3	%
U.S. government agencies		336.8		AA+		3.8	%
Non-U.S. government and government agencies		261.6		AA+		3.0	%
State, municipalities and political subdivisions		40.4		AA-		0.5	%
Mortgage-backed securities:
Agency mortgage-backed securities		1,400.9		AA+		15.9	%
Non-agency residential mortgage-backed securities		90.3		BBB+		1.0	%
Non-agency mortgage-backed securities (non-investment grade strategy)		176.8		CCC		2.0	%
Commercial mortgage-backed securities		290.4		AA+		3.4	%

Total mortgage-backed securities		1,958.4				22.3	%
Corporate securities:
Financial institutions		866.1		A+		9.8	%
Industrials		1,153.9		BBB-		13.1	%
Utilities		69.2		BBB-		0.8	%

Total corporate securities		2,089.2				23.7	%
Asset-backed securities:
Credit card receivables		24.9		AAA		0.3	%
Automobile loan receivables		31.3		AAA		0.4	%
Student loan receivables		133.0		AA+		1.5	%
Collateralized loan obligations		190.2		AA+		2.2	%
Other		31.5		AAA		0.3	%

Total asset-backed securities		410.9				4.7	%
Other invested assets:
Hedge funds		151.0		N/A		1.7	%
Private equity funds		504.9		N/A		5.7	%
Other private securities		127.6		N/A		1.5	%

Total other invested assets		783.5				8.9	%
Equity securities		523.9		N/A		6.0	%

Total investment portfolio	$	8,799.3				100.0	%

For more information on the securities in our investment portfolio, please see Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Critical Accounting Policies — Fair Value of Financial Instruments”.

Ratings as of December 31, 2012

The investment ratings (provided by Standard & Poor’s and Moody’s) for fixed-maturity securities held as of December 31, 2012 and the percentage of our total fixed-maturity securities they represented on that date were as follows:


	Fair Value		Percentage of Total Fair Value
	($ in millions)
Ratings
U.S. government and government agencies	$	1,865.9		28.2	%
AAA/Aaa		866.7		13.1	%
AA/Aa		1,905.3		28.8	%
A/A		876.1		13.2	%
BBB/Bbb		393.9		5.9	%
BB/Bb		245.9		3.7	%
B/B		262.3		4.0	%
CCC+ and below		210.4		3.1	%

Total	$	6,626.5		100.0	%

Maturity Distribution as of December 31, 2012

The maturity distribution for our fixed-maturity securities held as of December 31, 2012 was as follows:


	Fair Value		Percentage of Total Fair Value
	($ in millions)
Maturity
Due within one year	$	573.9		8.6	%
Due after one year through five years		2,835.9		42.8	%
Due after five years through ten years		774.4		11.7	%
Due after ten years		73.0		1.1	%
Mortgage-backed		1,958.4		29.6	%
Asset-backed		410.9		6.2	%

Total	$	6,626.5		100.0	%

Investment Returns for the Year Ended December 31, 2012

Our investment returns for year ended December 31, 2012 ($ in millions):


Net investment income	$	167.1
Net realized investment gains		306.4
Net change in unrealized gains		(17.6	)

Total net investment return	$	455.9

Total financial statement portfolio return(1)		5.5	%
Effective annualized yield(2)		2.1	%

(1)	Total financial statement portfolio return for our investment portfolio is calculated using beginning and ending market values adjusted for external cash flows and includes the net change in unrealized gains and losses.

(2)	Effective annualized yield is calculated by dividing net investment income by the average balance of aggregate invested assets, on an amortized cost basis.

Our Principal Operating Subsidiaries

Allied World Assurance Company, Ltd is a registered Class 4 Bermuda insurance and reinsurance company that began operations in November 2001. It carries on business from its offices in Bermuda and from branch offices licensed in Hong Kong and Singapore, as well as under its license from Labuan. Allied World Assurance Company (Europe) Limited was incorporated as a wholly-owned subsidiary of Allied World Assurance Holdings (Ireland) Ltd and has been approved to carry on business in the E.U. from its office in Dublin, Ireland since October 2002 and from a branch office in London, England since May 2003. Since its formation, Allied World Assurance Company (Europe) Limited has written business primarily originating from Dublin, Ireland, the United Kingdom and Continental Europe. Allied World Assurance Company (Reinsurance) Limited was incorporated as a wholly-owned subsidiary of Allied World Assurance Holdings (Ireland) Ltd and has been approved to carry on business in the E.U. from its office in Ireland since July 2003, from a branch office in London, England since August 2004 and from a branch office in Zug, Switzerland since October 2008. We include the business produced by Allied World Assurance Company (Reinsurance) Limited in our international insurance segment (other than reinsurance business written through its Swiss branch office) even though the majority of coverages are structured as facultative reinsurance. Allied World Assurance Company, AG is a direct subsidiary of Holdings which was formed in Switzerland in May 2010 and licensed by the Swiss Financial Market Supervisory Authority (“FINMA”) to write insurance and reinsurance from our office in Zug, Switzerland and approved to operate a branch from our office in Bermuda.

We write direct insurance in the United States primarily through four subsidiaries, Allied World Assurance Company (U.S.) Inc. and Allied World National Assurance Company, which we acquired in July 2002, and Darwin National Assurance Company and Darwin Select Insurance Company, which we acquired in October 2008. These companies are authorized or eligible to write insurance on both a surplus lines and admitted basis throughout the United States. In February 2008, we also acquired a fully licensed subsidiary which we operated as Allied World Reinsurance Company until late 2012, when it was renamed Allied World Insurance Company. It offers primarily reinsurance, although it also writes direct insurance. Lastly, Allied World Reinsurance Management Company was formed in Delaware in February 2012. It is licensed to write as a managing general underwriter for our U.S. reinsurance business.

The activities of AWAC Services Company (Bermuda), Ltd, AWAC Services Company (Ireland) Limited and AWAC Services Company are limited to providing certain administrative services to various subsidiaries of Holdings. During 2010, we formed a new subsidiary, 2232 Services Limited, in the United Kingdom in order to administratively support the operations of Syndicate 2232 at Lloyd’s. Allied World Financial Services, Ltd and Allied World Financial Services, Inc. were incorporated in Bermuda and Delaware, respectively, during 2012 to engage in investment transactions intended to complement the Company’s core property and casualty business.

Our Employees

As of February 11, 2013, we had a total of 818 full-time employees. We believe that our employee relations are good. No employees are subject to collective bargaining agreements.

Regulatory Matters

General

The business of insurance and reinsurance is regulated in most countries, and our operating subsidiaries are required to comply with a wide variety of laws and regulations both in the jurisdictions in which they are organized and where they sell their products. The insurance regulatory environment has become subject to increased scrutiny in many jurisdictions globally.

Allied World Assurance Company, AG obtained its license from FINMA in March 2011 and is approved to carry on insurance and reinsurance business in specific lines of non-life business. Allied World Assurance Company, AG is required to comply with the Federal Insurance Supervision Act (the “ISA”), the Federal Insurance Supervision Ordinance and regulations and guidance issued by FINMA. The following are some significant aspects of the Swiss regulatory framework:

Capital and Solvency Requirements. Allied World Assurance Company, AG is required to satisfy minimum capital and solvency requirements. Solvency is determined based on two independent methodologies:

•

Solvency I: This involves calculating a solvency margin by applying defined percentages to a base of the higher of gross annual premium or gross claims over a prescribed period of time and comparing coverage in terms of the company’s admissible funds against the required solvency margin determined in accordance with the ISA.

•

Swiss Solvency Test (the “SST”): The SST is similar in nature to the methodology that will be applied under the E.U.’s Solvency II regime. Under this approach, capital adequacy is achieved if risk bearing capital exceeds the required solvency capital.

The SST model involves a more sophisticated analysis by providing for a market-consistent valuation of all assets and liabilities of the firm with a methodological approach to risk categories (insurance risk, credit risk etc.) subjecting them to scenario stress tests at a basic level in the context of the use of a standard regulatory model or internal model validated by FINMA.

Allied World Assurance Company, AG is also required to satisfy technical provisions with regard to its assets, which include restrictions concerning the investment of “tied” assets, which are assets that are secured to ensure the claims of the company’s insurance clients.

Corporate Governance, Risk Management and Internal Controls. In addition to quantitative risk measures, FINMA requires full qualitative governance and control of risk in the firm. This includes requirements as to the ongoing fitness, propriety and competence of the directors and senior management, observance of ethical standards, objective and appropriate remuneration procedures, management of conflicts of interests, the institution of a compliance function, independence and adequate resourcing of control functions (including the responsible actuary, the risk management function and the internal audit function). Insurance companies are required to implement documented procedures for risk management and internal control.

In addition, Allied World Assurance Company, AG is subject to annual reporting requirements enacted by FINMA.

Allied World Assurance Company (Reinsurance) Limited also operates a branch office in Zug, Switzerland. As this subsidiary is domiciled outside of Switzerland, conducts only reinsurance business in Switzerland and is regulated by the Central Bank of Ireland (“CBI”) as a reinsurance undertaking, it is not required to be licensed by FINMA.

Bermuda

The Insurance Act 1978 of Bermuda (the “Insurance Act”) regulates the insurance and reinsurance business of Allied World Assurance Company, Ltd and provides that no person may carry on any insurance business in or from Bermuda unless registered as an insurer by the Bermuda Monetary Authority (the “BMA”). Allied World Assurance Company, Ltd has been registered as a Class 4 insurer by the BMA and approved to carry on general insurance and reinsurance business. The Insurance Act also imposes solvency and liquidity standards and auditing and reporting requirements on Bermuda insurance and reinsurance companies and grants the Bermuda Monetary Authority powers to supervise and investigate the affairs of these companies.

The following are some significant aspects of the Bermuda insurance and reinsurance regulatory framework:

Solvency and Capital Standards. As a Class 4 insurer, Allied World Assurance Company, Ltd is required to maintain a minimum solvency margin and to hold available statutory capital and surplus equal to or exceeding its enhanced capital requirement and target capital level as determined by the BMA under the Bermuda Solvency Capital Requirement model (“BSCR model”). The BSCR model is a risk-based capital model that provides a method for determining an insurer’s enhanced capital requirement and total capital level taking into account the risk characteristics of different aspects of an insurer’s business. Allied World Assurance Company, Ltd is required to maintain a minimum solvency margin that is equal to the greatest of (1) $100,000,000; (2) 50% of net premiums written (being gross premiums written less any premiums ceded, but the company may not deduct more than 25% of gross premiums written when computing net premiums written); and (3) 15% of net losses and loss expense reserves.

Eligible Capital. Allied World Assurance Company, Ltd is now required to disclose the makeup of its capital in accordance with the recently introduced “three-tiered capital system”. Under this system, all of the insurer’s capital instruments will be classified as either basic or ancillary capital, which in turn will be classified into one of three tiers based on their “loss absorbency” characteristics. Highest quality capital will be classified tier 1 capital, lesser quality capital will be classified as either tier 2 capital or tier 3 capital. The maximum of tier 1, 2 and 3 capital that may be used to support the company’s minimum solvency margin, enhanced capital requirement and target capital level will be determined in accordance with the BMA’s rules.

Liquidity. Allied World Assurance Company, Ltd must maintain a minimum liquidity ratio at least equal to the value of its relevant assets at not less than 75% of the amount of its relevant liabilities.

Dividends. Allied World Assurance Company, Ltd is prohibited from declaring or paying any dividends during any financial year if it is, or would be after such dividend, in breach of its minimum solvency margin, minimum liquidity ratio or enhanced capital requirements. Allied World Assurance Company, Ltd is also prohibited, without prior BMA approval, from declaring or paying in any financial year dividends of more than 25% of its total statutory capital and surplus or from reducing by 15% or more its total statutory capital. Under the Companies Act, Allied World Assurance Company Holdings, Ltd and each of its Bermuda subsidiaries may not declare or pay a dividend if such company has reasonable grounds for believing that it is, or would after the payment be, unable to pay its liabilities as they become due, or that the realizable value of its assets would thereby be less than its liabilities.

Principal office and representatives. Allied World Assurance Company, Ltd must maintain a principal office and appoint a principal representative, loss reserve specialist and independent auditor approved by the BMA.

Filings. Allied World Assurance Company, Ltd must file with the BMA annual and quarterly statutory financial returns, annual GAAP financial statements and an annual capital and solvency return.

Group Supervision. In 2011, the BMA notified Allied World Assurance Company, Ltd that it intended to act as group supervisor of our insurance and reinsurance companies and that Allied World Assurance Company, Ltd had been designated as the “designated insurer” in respect thereof. In accordance with the current group supervision and solvency rules, Allied World Assurance Company, Ltd is now required to prepare and submit annual audited group U.S. GAAP financial statements, annual group statutory financial statements, an annual group statutory financial return, an annual group capital and solvency return and quarterly group unaudited financial returns. Enhanced group capital requirements will come into effect in 2014.

Currency matters. As the BMA has classified each of our Bermuda subsidiaries as non-residents of Bermuda, these subsidiaries may engage in transactions in currencies other than Bermuda dollars and there are no restrictions on our ability to transfer funds (other than funds denominated in Bermuda dollars) in and out of Bermuda.

Code of Conduct. Allied World Assurance Company, Ltd must comply with the Insurance Code of Conduct which prescribes the duties, standards, procedures and sound business principles with which all companies registered under the Insurance Act must comply. Failure to comply with the requirements of the Insurance Code of Conduct will be taken into account by the BMA in determining whether an insurer is conducting its business in a sound and prudent manner as prescribed by the Insurance Act and may result in the BMA exercising its powers of intervention and investigation and will be a factor in calculating the operational risk charge under the insurer’s BSCR model.

Shareholder notification requirements. The BMA also requires written notification from any person who, directly or indirectly, becomes a holder of at least 10%, 20%, 33% or 50% of the voting shares of Allied World Assurance Company, Ltd or its parent within 45 days of becoming such a holder. The BMA may object to such a person if it appears to the BMA that the person is not fit and proper to be such a holder and/or require the shareholder to reduce its holdings or voting rights. A person that does not give the required notification or comply with such a notice or direction from the BMA will be guilty of an offense.

If it appears to the BMA that there is a risk of Allied World Assurance Company, Ltd becoming insolvent, or that Allied World Assurance Company, Ltd is in breach of the Insurance Act or any conditions imposed upon its registration, the BMA may take numerous restrictive actions to protect the public interest, including cancelling our registration under the Insurance Act.

Ireland

Allied World Assurance Company (Europe) Limited is authorized as a non-life insurance undertaking and is regulated by the CBI pursuant to the Insurance Acts 1909 to 2011, the Central Bank Acts 1942 to 2010, and all statutory instruments relating to insurance made or adopted under the European Communities Acts 1972 to 2009 (the “Irish Insurance Acts and Regulations”). The Third Non-Life Directive of the European Union (the “Non-Life Directive”) established a common framework for the authorization and regulation of non-life insurance undertakings within the E.U. The Non-Life Directive permits non-life insurance undertakings authorized in a member state of the E.U. to operate in other member states of the E.U. either directly from the home member state (on a freedom to provide services basis) or through local branches (by way of permanent establishment). Allied World Assurance Company (Europe) Limited operates a branch office in the United Kingdom and operates on a freedom to provide services basis in other European Union member states.

Allied World Assurance Company (Reinsurance) Limited is authorized and regulated by the CBI pursuant to the Central Bank Acts 1942 to 2010, all statutory instruments relating to reinsurance made or adopted under the European Communities Acts 1972 to 2009 and the provisions of the European Communities (Reinsurance) Regulations 2006 (which transposed the E.U. Reinsurance Directive into Irish law) and operates branches in London, England and Zug, Switzerland. Pursuant to the provisions of these regulations, reinsurance undertakings may, subject to the satisfaction of certain formalities, carry on reinsurance business in other E.U. member states either directly from the home member state (on a freedom to provide services basis) or through local branches (by way of permanent establishment).

United States

Our U.S. insurance and reinsurance subsidiaries are admitted or surplus line eligible in all 50 states and the District of Columbia. Allied World Assurance Company (U.S.) Inc. is admitted in three states, including Delaware, its state of domicile, surplus lines eligible in 49 jurisdictions, including the District of Columbia and Puerto Rico, and an accredited reinsurer in 38 jurisdictions, including the District of Columbia. Allied World National Assurance Company is admitted in 44 jurisdictions, including New Hampshire, its state of domicile, surplus lines eligible in three states and an accredited reinsurer in one state. Allied World Insurance Company (f/k/a Allied World Reinsurance Company) is admitted to write insurance and reinsurance in all 50 states, including New Hampshire, its state of domicile, and the District of Columbia. Darwin National Assurance Company is domiciled in Delaware and admitted to write in all other U.S. jurisdictions except Arkansas. Darwin Select

Insurance Company, which is an Arkansas company, is admitted in that state and is an eligible surplus lines writer in all other states and the District of Columbia, and Vantapro Specialty Insurance Company, which is an inactive Arkansas company, is currently admitted only in Arkansas and Illinois.

Our U.S. admitted and authorized insurers and reinsurers are subject to considerable regulation and supervision by state insurance regulators. The extent of regulation varies but generally has its source in statutes that delegate regulatory, supervisory and administrative authority to a department of insurance in each state. Among other things, state insurance commissioners regulate inter-affiliate transactions and dividend payments, insurer solvency standards, insurer and agent licensing, authorized investments, premium rates, restrictions on the size of risks that may be insured under a single policy, loss and expense reserves and provisions for unearned premiums, and deposits of securities for the benefit of policyholders. The states’ regulatory schemes also extend to policy form approval and market conduct regulation. In addition, some states have enacted variations of competitive rate making laws, which allow insurers to set premium rates for certain classes of insurance without obtaining the prior approval of the state insurance department. State insurance departments also conduct periodic examinations of the affairs of authorized insurance companies and require the filing of annual and other reports relating to the financial condition of companies and other matters.

Holding Company Regulation. Insurance holding company laws vary by state but generally require admitted insurers that are subsidiaries of insurance holding companies to register and file with state regulatory authorities certain reports including information concerning their capital structure, ownership, financial condition and general business operations. Generally, all transactions involving the insurers in a holding company system and their affiliates must be fair and, if material, require prior notice and approval or non-disapproval by the state insurance department. In addition, insurance holding company laws limit the amount of inter-company dividend payments which may be paid without regulator approval, as well as restricting any change of control transactions involving more than 10% of an insurance company’s voting securities.

Guaranty Fund Assessments and Involuntary Pools. Virtually all states require admitted insurers to participate in various forms of guaranty associations in order to bear a portion of the loss suffered by certain insureds caused by the insolvency of other insurers. Depending upon state law, insurers can be assessed an amount that is generally equal to between 1% and 2% of the annual premiums written for the relevant lines of insurance in that state to pay the claims of insolvent insurers. Most of these assessments are recoverable through premium rates, premium tax credits or policy surcharges. Many states also require participation in assigned risk pools involving workers compensation and automobile insurance.

Risk-Based Capital. U.S. insurers are also subject to risk-based capital (or “RBC”) guidelines that provide a method to measure the total adjusted capital (statutory capital and surplus plus other adjustments) of insurance companies taking into account the risk characteristics of the company’s investments and products. The RBC formulas establish capital requirements for four categories of risk: asset risk, insurance risk, interest rate risk and business risk. As of December 31, 2012, we believe all of our U.S. insurance and reinsurance subsidiaries had adjusted capital in excess of amounts requiring company or regulatory action.

NAIC Ratios. The National Association of Insurance Commissioners (“NAIC”) Insurance Regulatory Information System, or IRIS, was developed to help state regulators identify companies that may require special attention. IRIS is comprised of statistical and analytical phases consisting of key financial ratios whereby financial examiners review annual statutory basis statements and financial ratios. As of December 31, 2012, we do not believe that any of our U.S. insurance and reinsurance subsidiaries had an IRIS ratio range warranting any regulatory action.

Surplus Lines Regulation. The regulation of our U.S. subsidiaries’ excess and surplus lines insurance business differs significantly from their regulation as admitted or authorized insurers. These companies are subject to the surplus lines regulation and reporting requirements of the jurisdictions in which they are eligible to write surplus lines insurance. Allied World Assurance Company (U.S.) Inc. and Darwin Select Insurance Company, which conduct business on a surplus lines basis in a particular state, are generally exempt from that state’s guaranty fund laws and from participation in its involuntary pools.

Lloyd’s

General. Syndicate 2232 was licensed to start underwriting certain lines of insurance and reinsurance business effective June 2010. Allied World Capital (Europe) Limited is the sole corporate member of Syndicate 2232. Syndicate 2232 is managed by Capita Managing Agency Limited, an unaffiliated entity (“Capita”).

Lloyd’s intervention powers. As a member of Lloyd’s, Allied World Capital (Europe) Limited is obliged to comply with Lloyd’s bye laws and applicable provisions of the Financial and Services and Markets Act 2000. The Council of Lloyd’s has wide discretionary powers to regulate members’ underwriting at Lloyd’s and its exercise of these powers might affect the return on an investment of the corporate member in a given underwriting year.

Capital requirements. The capital required to support a syndicate’s underwriting capacity, referred to as “funds at Lloyd’s”, is assessed annually and is determined by Lloyd’s in accordance with the capital adequacy rules established by the FSA. If a member of Lloyd’s is unable to pay its debts to policyholders, such debts may be payable from the Lloyd’s Central Fund, which in many respects acts as an equivalent to a state guaranty fund in the United States. The Council of Lloyd’s has discretion to call or assess up to 3% of a member’s underwriting capacity in any one year as a Central Fund contribution.

Our business plan, including the maximum underwriting capacity, for Syndicate 2232 requires annual approval by Lloyd’s. The Lloyd’s Franchise Board may require changes to any business plan and may also require the provision of additional capital to support an approved business plan. If material changes in the business plan for Syndicate 2232 were required by Lloyd’s or if charges and assessments payable by Allied World Capital (Europe) Limited to Lloyd’s were to increase significantly, these events could have an adverse effect on the operations and financial results of Allied World Capital (Europe) Limited.

The Company has provided capital to support the underwriting of Syndicate 2232 in the form of a letter of credit. An underwriting year of account is closed by way of reinsurance to close on the third anniversary of the inception of the relevant underwriting year. Upon the closing of an underwriting year, a profit or loss will be declared for the closed year of account. Prior to the closure of an underwriting year, “funds at Lloyd’s” cannot typically be reduced unless the consent of Lloyd’s is obtained and such consent will only be considered where a member has surplus “funds at Lloyd’s”. Lloyd’s approval is also required before any person can acquire control of a Lloyd’s managing agent or Lloyd’s corporate member.

FSA regulation. Lloyd’s is authorized by the FSA and required to implement certain rules prescribed by the FSA under the Lloyd’s Act of 1982 regarding the operation of the Lloyd’s market. With respect to managing agents and corporate members, Lloyd’s prescribes certain minimum standards relating to management and control, solvency and other requirements and monitors managing agents’ compliance with such standards. Future regulatory changes or rulings by the FSA could impact the business strategy or financial assumptions made by Capita and/or Allied World Capital (Europe) Limited and such impact could adversely affect the Syndicate 2232’s financial conditions and results.

Other applicable laws. Lloyd’s worldwide insurance and reinsurance business is subject to various laws, regulations, treaties and policies of the E.U. as well as each jurisdiction in which it operates. Material changes in governmental requirements or laws could have an adverse effect on Lloyd’s and its member companies, including Allied World Capital (Europe) Limited.

Asia

Allied World Assurance Company, Ltd received regulatory approval to operate branch offices in Hong Kong, Singapore and Labuan, the Malaysian financial district, in March 2009, December 2009 and July 2011, respectively.

Latin America

In connection with the opening in 2012 of a Miami office to service primarily markets in Latin America and the Caribbean, Allied World Insurance Company has become registered as a foreign reinsurer in a number of Latin American countries.

Item 1A.

Risk Factors.

Factors that could cause our actual results to differ materially from those in the forward-looking statements contained in this Annual Report on Form 10-K and other documents we file with the SEC include the following:

Risks Related to Our Company

Downgrades or the revocation of our financial strength ratings would affect our standing among brokers and customers and may cause our premiums and earnings to decrease significantly.

Ratings have become an increasingly important factor in establishing the competitive position of insurance and reinsurance companies. Each rating is subject to periodic review by, and may be revised downward or revoked at the sole discretion of, the rating agency. The ratings are neither an evaluation directed to our investors nor a recommendation to buy, sell or hold our securities. For the financial strength rating of each of our principal operating subsidiaries, please see Item 1. “Business — Our Financial Strength Ratings”.

If the rating of any of our subsidiaries is revised downward or revoked, our competitive position in the insurance and reinsurance industry may suffer, and it may be more difficult for us to market our products. Specifically, any revision or revocation of this kind could result in a significant reduction in the number of insurance and reinsurance contracts we write and in a substantial loss of business as customers and brokers that place this business move to competitors with higher financial strength ratings.

Additionally, it is common for our reinsurance contracts to contain terms that would allow the ceding companies to cancel the contract for the portion of our obligations if our insurance subsidiaries are downgraded below an A—by either A.M. Best or Standard & Poor’s. Whether a ceding company would exercise the cancellation right (and, in the case of our U.S. reinsurance business, as described in the paragraph below, the right to require the posting of security) would depend, among other factors, on the reason for such downgrade, the extent of the downgrade, the prevailing market conditions and the pricing and availability of replacement reinsurance coverage. Therefore, we cannot predict in advance the extent to which these rights would be exercised, if at all, or what effect any such cancellations or security postings would have on our financial condition or future operations, but such effect could be material.

For example, if all ceding companies for which we have in force business as of December 31, 2012 were to exercise their cancellation rights or require the posting of security, the estimated impact could result in the return of premium, the commutation of loss reserves, the posting of collateral or a combination thereof. The unearned premium and reserve for losses and loss expenses associated with our reinsurance segment was $323.1 million and $1,480.6 million at December 31, 2012, respectively.

Our U.S. reinsurance subsidiary does not typically post security for the reinsurance contracts it writes. In addition to the cancellation right discussed above, should the company’s A.M. Best rating or Standard & Poor’s rating be downgraded below A-, some ceding companies would have the right to require the subsidiary to post security for its portion of the obligations under such contracts. If this were to occur, our U.S. reinsurance subsidiary may not have the liquidity to post security as stipulated in such reinsurance contracts.

All Lloyd’s syndicates benefit from Lloyd’s central resources, including the Lloyd’s brand, its network of global licenses and the central fund. The central fund is available at the discretion of the Council of Lloyd’s to meet any valid claim that cannot be met by the resources of any member. Because all Lloyd’s policies are ultimately backed by the central fund, a single market rating can be applied. The ability of Lloyd’s syndicates to trade in certain classes of business at current levels is dependent on the maintenance of a satisfactory credit rating issued by an accredited rating agency. A. M. Best has assigned Lloyd’s a financial strength rating of “A” (Excellent) and Standard & Poor’s and Fitch Ratings have assigned Lloyd’s a financial strength rating of “A+” (Strong). Syndicate 2232 benefits from Lloyd’s current ratings and would be adversely affected if the current ratings were downgraded from their present levels.

We also cannot assure you that A.M. Best, Standard & Poor’s, Moody’s or Fitch Ratings will not downgrade our insurance subsidiaries.

Actual claims may exceed our reserves for losses and loss expenses.

Our success depends on our ability to accurately assess the risks associated with the businesses that we insure and reinsure. We establish loss reserves to cover our estimated liability for the payment of all losses and loss expenses incurred with respect to the policies we write. Loss reserves do not represent an exact calculation of liability. Rather, loss reserves are estimates of what we expect the ultimate resolution and administration of claims will cost. These estimates are based on actuarial and statistical projections and on our assessment of currently available data, as well as estimates of future trends in claims severity and frequency, judicial theories of liability and other factors. Loss reserve estimates are refined as experience develops and claims are reported and resolved. Establishing an appropriate level of loss reserves is an inherently uncertain process. It is therefore possible that our reserves at any given time will prove to be inadequate.

To the extent we determine that actual losses or loss expenses exceed our expectations and reserves reflected in our financial statements, we will be required to increase our reserves to reflect our changed expectations. This could cause a material increase in our liabilities and a reduction in our profitability, including operating losses and a reduction of capital. Our results for the year ended December 31, 2012 included $298.6 million and $128.3 million of favorable (i.e., a loss reserve decrease) and adverse development (i.e., a loss reserve increase), respectively, of reserves relating to losses incurred for prior loss years. In comparison, our results for the year-ended December 31, 2011 included $362.2 million and $108.7 million of favorable and adverse development, respectively, of reserves relating to losses incurred for prior loss years. Our results for the year ended December 31, 2010 included $358.8 million and $45.5 million of favorable and adverse development, respectively, of reserves relating to losses incurred for prior loss years.

We have estimated our net losses from catastrophes based on actuarial analyses of claims information received to date, industry modeling and discussions with individual insureds and reinsureds. Accordingly, actual losses may vary from those estimated and will be adjusted in the period in which further information becomes available.

We may experience significant losses and volatility in our financial results from catastrophic events.

As a casualty and property insurer and reinsurer, we may experience significant losses from claims arising out of catastrophic events. Catastrophes can be caused by various unpredictable events, including earthquakes, volcanic eruptions, hurricanes, windstorms, hailstorms, drought, severe winter weather, floods, fires, tornadoes, explosions and other natural or man-made disasters, including oil spills and other environmental contamination. The international geographic distribution of our business subjects us to catastrophe exposure from natural events occurring in a number of areas throughout the world, examples of which include floods and windstorms in Europe, hurricanes and windstorms in Mexico, Florida, the Gulf Coast and the Atlantic Coast regions of the United States, typhoons and earthquakes in Japan and Taiwan, and earthquakes in California and parts of the Midwestern United States known as the New Madrid zone. Our largest exposure to wind events is concentrated in the Southeast and Gulf Coast of the United States. Our largest exposure to earthquake events is concentrated in California. The loss experience of catastrophe insurers and reinsurers has historically been characterized as low frequency but high severity in nature. In recent years, the frequency of major catastrophes appears to have increased and may continue to increase as a result of global climate change and other factors. Increases in the values and concentrations of insured property and the effects of inflation have resulted in increased severity of losses to the industry in recent years, and we expect this trend to continue.

The loss limitation methods we employ, such as establishing maximum aggregate exposed limits on policies written in key coastal and other defined geographical zones, restrictive underwriting guidelines and purchasing reinsurance, may not be sufficient protection against losses from catastrophes. In the event we do not accurately estimate losses from catastrophes that have already occurred, there is a possibility that loss reserves for such catastrophes will be inadequate to cover the losses. Because U.S. GAAP does not permit insurers and reinsurers to reserve for catastrophes until they occur, claims from these events could cause substantial volatility in our

financial results for any fiscal quarter or year and could have a material adverse effect on our financial condition and results of operations. In addition, losses from catastrophic events could result in downward revisions to our financial strength ratings from the various rating agencies that cover us.

The risk models we use to quantify catastrophe exposures and risk accumulations may prove inadequate in predicting all outcomes from potential catastrophe events.

We use widely accepted and industry-recognized catastrophe risk modeling programs to help us quantify our aggregate exposure to any one event. As with any model of physical systems, particularly those with low frequencies of occurrence and potentially high severity of outcomes, the accuracy of the model’s predictions is largely dependent on the accuracy and quality of the data provided in the underwriting process and the judgments of our employees and other industry professionals. These models do not anticipate all potential perils or events that could result in a catastrophic loss to us. Furthermore, it is often difficult for models to anticipate and incorporate events that have not been experienced during or as a result of prior catastrophes. Accordingly, it is possible for us to be subject to events or contingencies that have not been anticipated by our catastrophe risk models and which could have a material adverse effect on our reserves and results of operations.

We may be adversely impacted by inflation.

Our operations, like those of other property and casualty insurers and reinsurers, are susceptible to the effects of inflation because premiums are established before the ultimate amounts of loss and loss adjustment expense are known. Although we consider the potential effects of inflation when setting premium rates, our premiums may not fully offset the effects of inflation and essentially result in our under pricing the risks we insure and reinsure. Our reserve for losses and loss adjustment expenses includes assumptions about future payments for settlement of claims and claims-handling expenses, such as the value of replacing property and associated labor costs for the property business we write, the value of medical treatments and litigation costs. To the extent inflation causes theses costs to increase above reserves established for these claims, we will be required to increase our loss reserves with a corresponding reduction in our net income in the period in which the deficiency is identified, which may have a material adverse effect on our financial condition and results of operations.

We could face losses from terrorism and political unrest.

We have exposure to losses resulting from acts of terrorism and political instability. Although we generally exclude acts of terrorism from our property insurance policies and property reinsurance treaties where practicable, we provide coverage in circumstances where we believe we are adequately compensated for assuming those risks.

Our trade credit and political risk insurance program protects insureds with interests in foreign jurisdictions in the event governmental action prevents them from exercising their contractual rights and may also protect their assets against physical damage perils. This may include risks arising from expropriation, forced abandonment, license cancellation, trade embargo, contract frustration, non-payment, war on land or political violence, including terrorism, revolution, insurrection and civil unrest. Political risk insurance is typically provided to financial institutions, equity investors, exporters, importers, export credit agencies and multilateral agencies in an array of industries, in connection with investments and contracts in both emerging markets and developed countries.

Our trade credit and political risk insurance program also protects insureds in foreign jurisdictions against non-payment coverage on specific loan obligations as a result of commercial as well as political risk events. We attempt to manage our exposure, by among other things, setting credit limits by country, region, industry and individual counterparty and regularly reviewing our aggregate exposures. The occurrence of one or more large losses in our credit and political risk insurance portfolio could have a material adverse effect on our results of operations or financial condition.

We could face losses from pandemic diseases.

A pandemic disease could also cause us to suffer significantly increased insurance losses on a variety of coverages we offer. Our reinsurance protections may only partially offset these losses. Moreover, even in cases where we seek to exclude coverage, we may not be able to completely eliminate our exposure to these events. It is impossible to predict the timing or severity of these events with statistical certainty or to estimate the amount of loss that any given occurrence will generate. We could also suffer losses from a disruption of our business operations and our investments may suffer a decrease in value due to the occurrence of any of these events. To the extent we suffer losses from these risks, such losses could be significant.

Our business and our financial results may be adversely affected by unexpected levels of loss due to climate change.

A substantial portion of our revenues are derived from the underwriting of property insurance and reinsurance around the world. Therefore, large scale climate change (often referred to as “global warming”) as well as changing ocean temperatures could increase the frequency and severity of our loss costs related to property damage and/or business interruption due to hurricanes, windstorms, flooding, blizzards, tornadoes or other severe weather events particularly with respect to properties located in coastal areas. Additionally, if changes in climatic patterns and ocean temperature conditions continue, it is likely that such changes will further impair the ability to predict the frequency and severity of future weather-related disasters in many parts of the world. Over the longer term, such decreased predictability will create additional uncertainty as to future trends and exposures. In addition to unexpected increases in covered losses and decreased predictability, global climate change may also give rise to new environmental liability claims against policyholders that compete in the energy, automobile manufacturing and other industries that we serve. There could be an increase in claims against policyholders of directors and officers liability or related management liability policies alleging a failure to supervise, manage or properly disclose climate change exposures. We may also incur greater-than-expected expense levels due to the costs involved in responding to regulators, rating agencies and other interested constituencies with respect to climate change and other environmental disclosures.

The perceived effects of climate change on debt obligations can impact our investment mix in any one issuer, industry or region. The largest per-issuer exposure, outside of government and government-related issuers, represented less than 1% of our investment portfolio and the largest ten exposures represented less than 4% of the portfolio as of December 31, 2012.

The failure of any of the loss limitation methods we employ could have a material adverse effect on our financial condition or results of operations.

We seek to limit our loss exposure by adhering to maximum limitations on policies written in defined geographical zones (which limits our exposure to losses in any one geographic area), limiting program size for each client (which limits our exposure to losses with respect to any one client), adjusting retention levels and establishing per risk and per occurrence limitations for each event and establishing prudent underwriting guidelines for each insurance program written (all of which limit our liability on any one policy). Many of our direct liability insurance policies include maximum aggregate limitations. We cannot assure you that any of these loss limitation methods will be effective. In particular, geographic zone limitations involve significant underwriting judgments, including the determination of the areas of the zones and whether a policy falls within particular zone limits. Disputes relating to coverage and choice of legal forum may also arise. As a result, various provisions of our policies that are designed to limit our risks, such as limitations or exclusions from coverage (which limit the range and amount of liability to which we are exposed on a policy) or choice of forum (which provides us with a predictable set of laws to govern our policies and the ability to lower costs by retaining legal counsel in fewer jurisdictions), may not be enforceable in the manner we intend and some or all of our other loss limitation methods may prove to be ineffective. One or more catastrophic or other events could result in claims and expenses that substantially exceed our expectations and could have a material adverse effect on our results of operations.

Turmoil in the U.S. and international financial markets could harm our business, liquidity and financial condition, and our share price.

Recent U.S. debt ceiling and budget deficit concerns, together with adverse sovereign debt conditions in Europe, have increased the possibility of further economic slowdowns. These conditions, including the possibility of a prolonged recession, may potentially affect various aspects of our business, including the demand for and claims made under our products, our counterparty credit risk and the ability of our customers, counterparties and others to establish or maintain their relationships with us, our ability to access and efficiently use internal and external capital resources and our investment performance. Continued volatility in the U.S. and other securities markets may also adversely affect our share price.

We may be adversely impacted by the European sovereign debt crisis.

Developments in Europe have created uncertainty with respect to the ability of certain European countries to continue to service their sovereign debt obligations. The debt crisis and related European financial restructuring efforts may cause the value of the Euro to deteriorate. These factors could lead to an exit by a member country from the European Union. A country’s exit from the European Union could lead to a devaluation of any currency that such country introduces to replace the Euro. Our customers or brokers located in the impacted country may be unable to pay the monies due to us or may seek to renegotiate their insurance policies or reinsurance contracts in the new currency at terms that are less favorable or unfavorable to us. The resulting financial climate from such an event could also lead to greater-than-expected losses on some of the in-force insurance policies or reinsurance contracts. For example, directors and officers policies issued to financial institutions may experience higher losses as a result. We may also experience increased loss activity in our trade credit and political risk portfolio. To the extent we suffer losses from the crisis in Europe, such losses could be significant.

For our reinsurance business, we depend on the policies, procedures and expertise of ceding companies; these companies may fail to accurately assess the risks they underwrite which may lead us to inaccurately assess the risks we assume.

Because we participate in reinsurance markets, the success of our reinsurance underwriting efforts depends in part on the policies, procedures and expertise of the ceding companies making the original underwriting decisions (when an insurer transfers some or all of its risk to a reinsurer, the insurer is sometimes referred to as a “ceding company”). Underwriting is a matter of judgment, involving important assumptions about matters that are inherently unpredictable and beyond the ceding companies’ control and for which historical experience and statistical analysis may not provide sufficient guidance. We face the risk that the ceding companies may fail to accurately assess the risks they underwrite, which, in turn, may lead us to inaccurately assess the risks we assume as reinsurance; if this occurs, the premiums that are ceded to us may not adequately compensate us and we could face significant losses on these reinsurance contracts.

The availability and cost of security arrangements for reinsurance transactions may materially impact our ability to provide reinsurance from Bermuda to insurers domiciled in the United States.

Allied World Assurance Company, Ltd, our Bermuda insurance and reinsurance company, is not admitted as an insurer, nor is it accredited as a reinsurer, in any jurisdiction in the United States. As a result, it is required to post collateral security with respect to most reinsurance liabilities it assumes from ceding insurers domiciled in the United States in order for U.S. ceding companies to obtain credit on their U.S. statutory financial statements with respect to the insurance liabilities ceded to them. Under applicable statutory provisions, the security arrangements may be in the form of letters of credit, reinsurance trusts maintained by trustees or funds-withheld arrangements where assets are held by the ceding company. Allied World Assurance Company, Ltd uses trust accounts and has access to up to $1.45 billion in letters of credit under two letter of credit facilities. The letter of credit facilities impose restrictive covenants, including restrictions on asset sales, limitations on the incurrence of certain liens and required collateral and financial strength levels. Violations of these or other covenants could result in the suspension of access to letters of credit or such letters of credit becoming due and payable. Our access to our existing letter of credit facilities is dependent on the ability of the banks that are parties to these facilities to meet their commitments. Our $1 billion letter of credit facility with Citibank Europe plc is on an uncommitted basis, which means Citibank Europe has agreed to offer us up to $1 billion in letters of credit, but

they are not contractually obligated for that full amount. Our $450 million syndicated letter of credit facility expires in June 2016. The lenders under our letter of credit facilities may not be able to meet their commitments if they become insolvent, file for bankruptcy protection or if they otherwise experience shortages of capital and liquidity. If these letter of credit facilities are not sufficient or drawable or if Allied World Assurance Company, Ltd is unable to renew either or both of these facilities or to arrange for trust accounts or other types of security on commercially acceptable terms, its ability to provide reinsurance to U.S.-domiciled insurers may be severely limited and adversely affected.

In addition, security arrangements with ceding insurers may subject our assets to security interests or may require that a portion of our assets be pledged to, or otherwise held by, third parties. Although the investment income derived from our assets while held in trust typically accrues to our benefit, the investment of these assets is governed by the terms of the letter of credit facilities and the investment regulations of the state of domicile of the ceding insurer, which generally regulate the amount and quality of investments permitted and which may be more restrictive than the investment regulations applicable to us under Bermuda law. These restrictions may result in lower investment yields on these assets, which could adversely affect our profitability.

We depend on a small number of brokers for a large portion of our revenues. The loss of business provided by any one of them could adversely affect us.

We market our insurance and reinsurance products worldwide through insurance and reinsurance brokers. For the year ended December 31, 2012, our top three brokers represented approximately 55% of our total gross premiums written. Marsh, Aon (including Benfield Group Ltd.) and Willis were responsible for the distribution of approximately 25%, 19% and 11%, respectively, of our total gross premiums written for the year ended December 31, 2012. Loss of all or a substantial portion of the business produced by any one of those brokers could have a material adverse effect on our financial condition, results of operations and business.

Our reliance on brokers subjects us to their credit risk.

In accordance with industry practice, we frequently pay amounts owed on claims under our insurance and reinsurance contracts to brokers, and these brokers, in turn, pay these amounts to the customers that have purchased insurance or reinsurance from us. If a broker fails to make such a payment, it is likely that, in most cases, we will be liable to the client for the deficiency because of local laws or contractual obligations. Likewise, when a customer pays premiums for policies written by us to a broker for further payment to us, these premiums are generally considered to have been paid and, in most cases, the client will no longer be liable to us for those amounts, whether or not we actually receive the premiums. Consequently, we assume a degree of credit risk associated with the brokers we use with respect to our insurance and reinsurance business.

We may be unable to purchase reinsurance for our own account on commercially acceptable terms or to collect under any reinsurance we have purchased.

We acquire reinsurance purchased for our own account to mitigate the effects of large or multiple losses on our financial condition. From time to time, market conditions have limited, and in some cases prevented, insurers and reinsurers from obtaining the types and amounts of reinsurance they consider adequate for their business needs. For example, following the events of September 11, 2001, terms and conditions in the reinsurance markets generally became less attractive to buyers of such coverage. Similar conditions may occur at any time in the future and we may not be able to purchase reinsurance in the areas and for the amounts required or desired. Even if reinsurance is generally available, we may not be able to negotiate terms that we deem appropriate or acceptable or to obtain coverage from entities with satisfactory financial resources.

In addition, the recent financial market turmoil may significantly adversely affect the ability of our reinsurers and retrocessionaires to meet their obligations to us. A reinsurer’s insolvency, or inability or refusal to make payments under a reinsurance or retrocessional reinsurance agreement with us, could have a material adverse effect on our financial condition and results of operations because we remain liable to the insured under the corresponding coverages written by us.

Our investment performance may adversely affect our financial performance and ability to conduct business.

We derive a significant portion of our income from our invested assets. As a result, our operating results depend in part on the performance of our investment portfolio. Ongoing conditions in the U.S. and international financial markets have and could continue to adversely affect our investment portfolio. Depending on market conditions, we could incur additional losses in future periods, which could have a material adverse effect on our financial condition, results of operations and business.

Our investment portfolio is overseen by our Chief Investment Officer and managed by professional investment management firms in accordance with the Investment Policy Statement approved by the Investment Committee of the Board of Directors. Our investment performance is subject to a variety of risks, including risks related to general economic conditions, market volatility and interest rate fluctuations, liquidity risk, and credit and default risk. Additionally, with respect to some of our investments, we are subject to pre-payment or reinvestment risk. Our current Investment Policy Statement constrains the amount of our investment portfolio that may be invested in alternatives (such as hedge funds and private equity). As a result, we may be subject to restrictions on redemption, which may limit our ability to withdraw funds or realize on such investments for some period of time after our initial investment. The values of, and returns on, such investments may also be more volatile. In addition, investments in hedge funds may involve certain other risks, including the limited operating history of a fund as well as risks associated with the strategies employed by the managers of the fund.

Because of the unpredictable nature of losses that may arise under insurance or reinsurance policies written by us, our liquidity needs could be substantial and may arise at any time. To the extent we are unsuccessful in managing our investment portfolio within the context of our expected liabilities, we may be forced to liquidate our investments at times and prices that are not optimal, or we may have difficulty in liquidating some of our alternative investments due to restrictions on sales, transfers and redemptions noted above. This could have a material adverse effect on the performance of our investment portfolio. If our liquidity needs or general liability profile unexpectedly change, we may not be successful in continuing to structure our investment portfolio in its current manner. In addition, investment losses could significantly decrease our book value, thereby affecting our ability to conduct business.

While we maintain an investment portfolio with instruments rated highly by the recognized rating agencies, there are no assurances that these high ratings will be maintained. Over the past several years companies with highly-rated debt have filed for bankruptcy. The assignment of a high credit rating does not preclude the potential for the risk of default on any investment instrument.

Any increase in interest rates and/or credit spread levels could result in significant losses in the fair value of our investment portfolio.

Our investment portfolio contains interest-rate-sensitive instruments that may be adversely affected by changes in interest rates. Fluctuations in interest rates affect our returns on fixed income investments. Generally, investment income will be reduced during sustained periods of lower interest rates as higher-yielding fixed income securities are called, mature or are sold and the proceeds reinvested at lower rates. During periods of rising interest rates, prices of fixed income securities tend to fall and realized gains upon their sale are reduced. Interest rates are highly sensitive to many factors, including governmental monetary policies, domestic and international economic and political conditions and other factors beyond our control. We may not be able to effectively mitigate interest rate sensitivity. In particular, a significant increase in interest rates could result in significant losses, realized or unrealized, in the fair value of our investment portfolio and, consequently, could have a material adverse effect on our financial condition and results of operations. Additionally, changes in the credit spread (the difference in the percentage yield) between U.S. Treasury securities and non-U.S. Treasury securities may negatively impact our investment portfolio as we may not be able to effectively mitigate credit spread sensitivity. In particular, a significant increase in credit spreads could result in significant losses, realized or unrealized, in the fair value of our investment portfolio and, consequently, could have a material adverse effect on our financial condition and results of operations.

In addition, our investment portfolio includes U.S. government agency and non-agency commercial and residential mortgage-backed securities. As of December 31, 2012, mortgage-backed securities constituted approximately 22% of the fair value of our total investments and cash and cash equivalents, of which 16% of the fair value was invested in U.S. government agency mortgage-backed securities. Changes in interest rates can expose us to prepayment risks on these investments. In periods of declining interest rates, mortgage prepayments generally increase and mortgage-backed securities are generally prepaid more quickly, requiring us to reinvest the proceeds at the then current market rates. In periods of rising interest rates, mortgage-backed securities may have declining levels of prepayments, extending their maturity and duration, thereby negatively impacting the security’s price.

Our non-agency commercial and residential mortgage-backed securities are subject to delinquencies, defaults and losses on the underlying mortgage loans. While many of the factors that led to such delinquencies, defaults and losses have moderated over the last 12 months, further deterioration is possible. Delinquencies, defaults and losses with regard to non-agency residential mortgage-backed securities are driven in part by residential property values. A decline or an extended flattening in property values may result in increased delinquencies, defaults and losses on residential mortgage loans generally, especially with respect to second homes and investor properties, and with respect to any residential mortgage loans where the aggregate loan amounts (including any subordinate loans) are close to or greater than the related property values. This would negatively impact the value of our securities.

Our investment portfolio includes below investment-grade securities that have a higher degree of credit or default risk, which could result in significant losses in the fair value of our investment portfolio.

Our investment portfolio consists primarily of investment grade, fixed-maturity securities. We invest a smaller portion of the portfolio in below investment-grade securities. As of December 31, 2012, below investment-grade securities comprised approximately 11% of our fixed-maturity portfolio. These securities, which pay a higher rate of interest, also have a higher degree of credit or default risk. These securities may also be less liquid and/or may experience default losses in times of economic weakness or market disruptions (such as a recession), which could have a material adverse effect on our financial condition and results of operations.

The valuation of our investments may include methodologies, estimations and assumptions that are subject to differing interpretations and could result in changes to investment valuations that may materially adversely affect our financial condition or results of operations.

During periods of market disruptions, it may be difficult to value certain of our securities if trading becomes less frequent or market data becomes less observable. In addition, there may be certain asset classes that were in active markets with significant observable data that become illiquid due to the recent financial environment. In such cases, the valuation of a greater number of securities in our investment portfolio may require more subjectivity and management judgment. As such, valuations may include inputs and assumptions that are less observable or require greater estimation as well as valuation methods that are more sophisticated or require greater estimation thereby resulting in values which may be less than the value at which the investments may be ultimately sold. Further, rapidly changing and unpredictable credit and equity market conditions could materially affect the valuation of securities as reported within our consolidated financial statements and the period-to-period changes in value could vary significantly. Decreases in value could have a material adverse effect on our financial condition and results of operations.

We may be adversely affected by fluctuations in currency exchange rates.

The U.S. dollar is our reporting currency and the functional currency of all of our operating subsidiaries. We enter into insurance and reinsurance contracts where the premiums receivable and losses payable are denominated in currencies other than the U.S. dollar. In addition, we maintain a portion of our investments and liabilities in currencies other than the U.S. dollar. Assets in non-U.S. currencies are generally converted into U.S. dollars at the time of receipt. When we incur a liability in a non-U.S. currency, we carry such liability on our books in the original currency. These liabilities are converted from the non-U.S. currency to U.S. dollars at the time of payment. We may incur foreign currency exchange gains or losses as we ultimately receive premiums and settle claims required to be paid in foreign currencies.

We have currency hedges in place that seek to alleviate our potential exposure to volatility in foreign exchange rates and intend to consider the use of additional hedges when we are advised of known or probable significant losses that will be paid in currencies other than the U.S. dollar. To the extent that we do not seek to hedge our foreign currency risk or our hedges prove ineffective, the impact of a movement in foreign currency exchange rates could adversely affect our financial condition or results of operations. The sovereign debt crisis in Europe and the related restructuring efforts may, among other factors, magnify the risk of exchange rate volatility.

We may require additional capital in the future that may not be available to us on commercially favorable terms.

Our future capital requirements depend on many factors, including our ability to write new business and to establish premium rates and reserves at levels sufficient to cover losses. To the extent that the funds generated by insurance premiums received and sale proceeds and income from our investment portfolio are insufficient to fund future operating requirements and cover losses and loss expenses, we may need to raise additional funds through financings or reduce our assets. Financial market volatility since 2008 has created uncertainty in the equity and credit markets and may have affected our ability, and the ability of others within our industry, to raise additional capital in the public or private markets. Any future financing, if available at all, may be on terms that are not favorable to us. In the case of equity financing, dilution to our shareholders could result, and the securities issued may have rights, preferences and privileges that are senior or otherwise superior to those of our common shares.

Our business could be adversely affected if we lose any member of our management team or are unable to attract and retain our personnel.

Our success depends in substantial part on our ability to attract and retain our employees who generate and service our business. We rely substantially on the services of our executive management team. If we lose the services of any member of our executive management team, our business could be adversely affected. If we are unable to attract and retain other talented personnel, the further implementation of our business strategy could be impeded. This, in turn, could have a material adverse effect on our business. We currently have written employment agreements with our Chief Executive Officer, General Counsel, Chief Actuary and certain other members of our executive management team. We do not maintain key man life insurance policies for any of our employees.

Employee error and misconduct may be difficult to detect and prevent and could adversely affect our business, results of operations and financial condition.

We may experience losses from, among other things, fraud, errors, the failure to document transactions properly or to obtain proper internal authorization or the failure to comply with regulatory or legal requirements. It is not always possible to deter or prevent employee misconduct and the precautions we take to prevent and detect this activity may not be effective in all cases. Losses related to employee error or misconduct could adversely affect our financial condition, results of operations and business.

If a program administrator were to exceed its underwriting authority or otherwise breach obligations owed to us, we could be adversely affected.

We write a portion of our insurance business through relationships with program administrators, under contracts pursuant to which we authorize such program administrators to underwrite and bind business on our behalf, within guidelines we prescribe. In this structure, we rely on controls incorporated in the provisions of the program administration agreement, as well as on the administrator’s internal controls, to limit the risks insured to those which are within the prescribed parameters. Although we monitor program administrators on an ongoing basis, our monitoring efforts may not be adequate or our program administrators could exceed their underwriting authorities or otherwise breach obligations owed to us. We are liable to policyholders under the terms of policies underwritten by program administrators, and to the extent such administrators exceed their authorities or otherwise breach their obligations to us, our financial condition or results of operations could be material adversely affected.

If we experience difficulties with our information technology and telecommunications systems and/or data security, our ability to conduct our business might be adversely affected.

We rely heavily on the successful, uninterrupted functioning of our information technology (“IT”) and telecommunications systems. Our business and continued expansion is highly dependent upon our ability to perform, in an efficient and uninterrupted fashion, necessary business functions, such as pricing, quoting and processing policies, paying claims, performing actuarial and other modeling functions. A failure of our IT and telecommunication systems or the termination of third-party software licenses we rely on in order to maintain such systems could materially impact our ability to write and process business, provide customer service, pay claims in a timely manner or perform other necessary actuarial, legal, financial and other business functions. Computer viruses, hackers and other external hazards, as well as internal exposures such as potentially dishonest employees, could expose our IT and data systems to security breaches that may result in liability to us, cause our data to be corrupted and cause us to commit resources, management time and money to prevent or correct security breaches. Some of our key business partners rely on our systems for critical underwriting and administration functions and interruption and/or failure of these systems could cause significant liability to them. If we do not maintain adequate IT and telecommunications systems, we could experience adverse consequences, including inadequate information on which to base critical decisions, the loss of existing customers, difficulty in attracting new customers, litigation exposures and increased administrative expenses. As a result, our ability to conduct our business might be adversely affected.

The integration of acquired companies, the growth of our operations through new lines of insurance or reinsurance business, the expansion into new geographic regions and/or the entering into joint ventures or partnerships may expose us to operational risks.

Acquisitions involve numerous risks, including operational, strategic and financial risks such as potential liabilities associated with the acquired business. We may experience difficulties in integrating an acquired company, which could adversely affect the acquired company’s performance or prevent us from realizing anticipated synergies, cost savings and operational efficiencies. Our existing businesses could also be negatively impacted by acquisitions. Expanding our lines of business, expanding our geographic reach and entering into joint ventures or partnerships also involve operational, strategic and financial risks, including retaining qualified management and implementing satisfactory budgetary, financial and operational controls. Our failure to manage successfully these risks may adversely affect our financial condition, results of operations or business, or we may not realize any of the intended benefits.

As a result of the higher par value of our common shares and increased shareholder approval power under Swiss law, we have less flexibility with respect to certain aspects of capital management.

The par value of our common shares is CHF 12.64 per share (as may be adjusted in connection with the payment of dividends by virtue of a par value reduction, as approved by our shareholders). Under Swiss law, we may not issue shares below par value. In the event we need to raise common equity capital at a time when the trading price of our shares is below the par value of such shares, we will be unable to do so. As a consequence we would have to consider reducing the par value of our common shares, which in turn would reduce our ability to make tax-free distributions by par value reductions to our shareholders. We would also need to obtain approval of our shareholders to decrease the par value of our common shares, which would require us to file a proxy statement with the SEC and convene a meeting of shareholders. This would delay any capital raising plans and there is no assurance that we would be able to obtain such shareholder approval. See “Risks Related to Taxation — We may not be able to make distributions or repurchase shares without subjecting you to Swiss withholding tax.”

Swiss law affords shareholders more powers and allows our shareholders to authorize share capital that can be issued by the Board of Directors without shareholder approval. Under Swiss law, this authorization is limited to 50% of a company’s existing registered share capital and must be renewed by the shareholders every two years. Under our Articles of Association, this authorization is further limited to 20% of our existing registered share capital. Additionally, subject to specified exceptions described in our Articles of Association, Swiss law grants preemptive rights to existing shareholders to subscribe for new issuances of shares and other securities.

Swiss law also does not provide as much flexibility in the various terms that can attach to different classes of shares. For example, we will not be able to issue preferred stock without the approval of a majority of the votes cast at a shareholder meeting. Swiss law also reserves for approval by shareholders many corporate actions, such as that dividends must be approved by shareholders. There may be situations where the restrictions on capital management flexibility under Swiss law could have a material adverse effect on us and our shareholders.

We may become subject to additional Swiss regulation.

Under so-called “group supervision,” FINMA has the right to supervise us on a group-wide basis. On December 11, 2009, we received non-binding written confirmation from FINMA that it will not subject us to group supervision based primarily on the fact that most of our senior management will not reside in Switzerland. Factors which can cause FINMA to subject us to group supervision include the location of our top management and corresponding requests by foreign regulators. We cannot assure you that our future business needs may not require us to have a greater management presence in Switzerland or that FINMA will not otherwise determine to exercise group supervision over us. If subjected to group supervision, we may incur additional costs and administrative obligations. These additional costs and administrative obligations may have a substantial impact on our organizational and operational flexibility.

Risks Related to the Insurance and Reinsurance Business

The insurance and reinsurance business is historically cyclical and we expect to experience periods with excess underwriting capacity and unfavorable premium rates and policy terms and conditions.

Historically, insurers and reinsurers have experienced significant fluctuations in operating results due to competition, frequency of occurrence or severity of catastrophic events, levels of underwriting capacity, general economic conditions and other factors. The supply of insurance and reinsurance is related to prevailing prices, the level of insured losses and the level of industry surplus which, in turn, may fluctuate in response to changes in rates of return on investments being earned in the insurance and reinsurance industry. The occurrence, or non-occurrence, of catastrophic events, the frequency and severity of which are unpredictable, affects both industry results and consequently prevailing market prices for certain of our products. As a result of these factors, the insurance and reinsurance business historically has been a cyclical industry characterized by periods of intense competition on price and policy terms due to excessive underwriting capacity as well as periods when shortages of capacity permit favorable premium rates and policy terms and conditions. Increases in the supply of insurance and reinsurance may have adverse consequences for us, including fewer policies and contracts written, lower premium rates, increased expenses for customer acquisition and retention and less favorable policy terms and conditions.

Increased competition in the insurance and reinsurance markets in which we operate could adversely impact our operating margins.

The insurance and reinsurance industry are highly competitive. We compete with major U.S. and international insurers and reinsurers. Many of our competitors have greater financial, marketing and management resources. We also compete with new companies that continue to be formed to enter the insurance and reinsurance markets.

In addition, risk-linked securities and derivative and other non-traditional risk transfer mechanisms and vehicles are being developed and offered by other parties, including entities other than insurance and reinsurance companies. The availability of these non-traditional products could reduce the demand for traditional insurance and reinsurance. A number of new, proposed or potential industry or legislative developments could further increase competition in our industry.

New competition from these developments could result in fewer contracts written, lower premium rates, increased expenses for customer acquisition and retention and less favorable policy terms and conditions, which could have a material adverse effect on our growth, financial condition or results of operations.

The effects of emerging claims and coverage issues on our business are uncertain.

As industry practices and legal, judicial, social and other conditions change, unexpected and unintended issues related to claims and coverage may emerge. These issues may adversely affect our business by either extending coverage beyond our underwriting intent or by increasing the number or size of claims. In some instances, these changes may not become apparent until some time after we have issued insurance or reinsurance contracts that are affected by the changes. As a result, the full extent of liability under our insurance and reinsurance contracts may not be known for many years after a contract is issued. Examples of emerging claims and coverage issues include:

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larger defense costs, settlements and jury awards in cases involving professionals and corporate directors and officers covered by professional liability and directors and officers liability insurance; and

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a trend of plaintiffs targeting property and casualty insurers in class action litigation related to claims handling, insurance sales practices and other practices related to the conduct of our business.

Risks Related to Laws and Regulations Applicable to Us

Compliance by our insurance subsidiaries with the legal and regulatory requirements to which they are subject is expensive. Any failure to comply could have a material adverse effect on our business.

Our insurance subsidiaries are required to comply with a wide variety of laws and regulations applicable to insurance or reinsurance companies, both in the jurisdictions in which they are organized and where they sell their insurance and reinsurance products. The insurance and regulatory environment, in particular for offshore insurance and reinsurance companies, has become subject to increased scrutiny in many jurisdictions, including the United States, various states within the United States and the United Kingdom. In the past, there have been Congressional and other initiatives in the United States regarding increased supervision and regulation of the insurance industry. It is not possible to predict the future impact of changes in laws and regulations on our operations. The cost of complying with any new legal requirements affecting our subsidiaries could have a material adverse effect on our business.

In addition, our subsidiaries may not always be able to obtain or maintain necessary licenses, permits, authorizations or accreditations. They also may not be able to fully comply with, or to obtain appropriate exemptions from, the laws and regulations applicable to them. Any failure to comply with applicable law or to obtain appropriate exemptions could result in restrictions on either the ability of the company in question, as well as potentially its affiliates, to do business in one or more of the jurisdictions in which they operate or on brokers on which we rely to produce business for us. In addition, any such failure to comply with applicable laws or to obtain appropriate exemptions could result in the imposition of fines or other sanctions. Any of these sanctions could have a material adverse effect on our business.

Our Bermuda insurance subsidiary, Allied World Assurance Company, Ltd, is registered as a Class 4 Bermuda insurance and reinsurance company and is subject to regulation and supervision in Bermuda. The applicable Bermudian statutes and regulations generally are designed to protect insureds and ceding insurance companies rather than shareholders or noteholders. Among other things, those statutes and regulations:

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require Allied World Assurance Company, Ltd to maintain minimum levels of capital and surplus,

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impose liquidity requirements which restrict the amount and type of investments it may hold,

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prescribe solvency standards that it must meet, and

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restrict payments of dividends and reductions of capital and provide for the performance of periodic examinations of Allied World Assurance Company, Ltd and its financial condition.

These statutes and regulations may, in effect, restrict the ability of Allied World Assurance Company, Ltd to write new business or distribute funds. Although it conducts its operations from Bermuda, Allied World Assurance Company, Ltd is not authorized to directly underwrite local risks in Bermuda.

Allied World Assurance Company, Ltd also operates branch offices in Hong Kong, Singapore and Labuan, which offices are regulated by the Office of the Insurance Commissioner in Hong Kong, the Monetary Authority of Singapore and the Labuan Financial Services Authority, respectively.

Our U.S. insurance and reinsurance subsidiaries, Allied World Assurance Company (U.S.) Inc. and Darwin National Assurance Company, each a Delaware domiciled subsidiary, Allied World National Assurance Company and Allied World Insurance Company, each a New Hampshire domiciled subsidiary, and Darwin Select Insurance Company and Vantapro Specialty Insurance Company, each an Arkansas domiciled subsidiary, are subject to the statutes and regulations of their relevant state of domicile as well as any other state in the United States where they conduct business. In the states where the companies are admitted, the companies must comply with all insurance laws and regulations, including insurance rate and form requirements. Insurance laws and regulations may vary significantly from state to state. In those states where the companies act as surplus lines carriers, the states’ regulation focuses mainly on the company’s solvency.

Allied World Assurance Company (Europe) Limited, an Irish domiciled insurer, operates within the E.U. non-life insurance legal and regulatory framework as established under the Non-Life Directive, and operates a branch in London, England. Allied World Assurance Company (Europe) Limited is required to operate in accordance with the provisions of the Irish Insurance Acts and Regulations and the requirements of the CBI.

Allied World Assurance Company (Reinsurance) Limited, an Irish domiciled reinsurer, is regulated by the CBI pursuant to the Central Bank Acts 1942 to 2010, all statutory instruments relating to reinsurance made or adopted under the European Communities Acts 1972 to 2009, and the provisions of the European Communities (Reinsurance) Regulations 2006 (which transposed the E.U. Reinsurance Directive into Irish law) and operates branches in London, England and Zug, Switzerland. Pursuant to the provisions of these regulations, reinsurance undertakings may, subject to the satisfaction of certain formalities, carry on reinsurance business in other E.U. member states either directly from the home member state (on a freedom to provide services basis) or through local branches (by way of permanent establishment).

Capita, as the managing agent for our Lloyd’s Syndicate 2232, is regulated by the FSA and must adhere to certain minimum standards relating to management, underwriting, control and solvency as established by Lloyd’s. Capita must also ensure that the underwriting activities of Lloyd’s Syndicate 2232 are in accordance with the business plan approved by Lloyd’s annually.

Allied World Assurance Company, AG, a Swiss domiciled insurer and reinsurer located in Zug, is regulated by FINMA.

Our Bermuda operating company could become subject to regulation in the United States.

Allied World Assurance Company, Ltd, our Bermuda operating company is not admitted as an insurer, nor accredited as a reinsurer, in any jurisdiction in the United States. For the year ended December 31, 2012, more than 70% of the gross premiums written by Allied World Assurance Company, Ltd, however, are derived from insurance or reinsurance contracts entered into with entities domiciled in the United States. The insurance laws of each state in the United States regulate the sale of insurance and reinsurance within the state’s jurisdiction by foreign insurers. Allied World Assurance Company, Ltd conducts its business through its Bermuda office and does not maintain an office, and its personnel do not solicit insurance business, resolve claims or conduct other insurance business, in the United States. While Allied World Assurance Company, Ltd does not believe it is in violation of insurance laws of any jurisdiction in the United States, we cannot be certain that inquiries or challenges to our insurance and reinsurance activities will not be raised in the future. It is possible that, if Allied World Assurance Company, Ltd were to become subject to any laws of this type at any time in the future, we would not be in compliance with the requirements of those laws.

Our holding company structure and regulatory and other constraints affect our ability to pay dividends and make other payments.

Allied World Assurance Company Holdings, AG is a holding company, and as such has no substantial operations of its own. It does not have any significant assets other than its ownership of the shares of its direct and indirect subsidiaries. Dividends and other permitted distributions from subsidiaries are expected to be the sole source of funds for Allied World Assurance Company Holdings, AG to meet any ongoing cash requirements and to pay any dividends to shareholders.

Swiss Law

Under Swiss law, dividends may be paid out only if we have sufficient distributable profits from previous fiscal years or if we have legal reserves, each as will be presented on Holdings’ audited statutory financial statements prepared in accordance with Swiss law. Payments out of the share capital (in other words, the aggregate par value of our share capital) in the form of dividends are not allowed; however, payments out of share capital may be made by way of a capital reduction to achieve a similar result as the payment of dividends. The affirmative vote of shareholders holding a majority of the votes cast at a shareholder meeting must approve reserve reclassifications and distributions of dividends. Our Board of Directors may propose to shareholders that a dividend be paid but cannot itself authorize the dividend. In addition, our shareholders may propose dividends without any dividend proposal by the Board of Directors. Under Swiss law, upon satisfaction of all legal requirements, we will be required to submit an application to the Swiss Commercial Register to register each applicable par value reduction. Without effective registration of the appropriate documentation with the Swiss Commercial Register, we will not be able to proceed with the payment of any installment of any dividend made by par value reduction. We cannot assure you that the Swiss Commercial Register will approve the registration of any applicable par value reduction.

Under Swiss law, if our general capital reserves amount to less than 20% of the share capital recorded in the Swiss Commercial Register (i.e., 20% of the aggregate par value of our capital), then at least 5% of our annual profit must be retained as general reserves. Swiss law permits us to accrue additional general reserves. In addition, we are required to create a special reserve on Holdings’ audited statutory financial statements in the amount of the purchase price of common shares we or any of our subsidiaries repurchases, which amount may not be used for dividends.

Swiss companies generally must maintain separate audited statutory financial statements for the purpose of, among other things, determining the amounts available for the return of capital to shareholders, including by way of a distribution of dividends. Amounts available for the return of capital as indicated on Holdings’ audited statutory financial statements may be materially different from amounts reflected in our consolidated U.S. GAAP financial statements. Our auditor must confirm that a dividend proposal made to shareholders complies with Swiss law and our Articles of Association.

We are required under Swiss law to declare any dividends and other capital distributions in Swiss francs. We have made and intend to continue to make any dividend payments to holders of our common shares in U.S. dollars. Continental Stock Transfer & Trust Company, our transfer agent, will be responsible for paying the U.S. dollars to registered holders of our common shares, less amounts subject to withholding for taxes. As a result, shareholders may be exposed to fluctuations in the U.S. dollar—Swiss franc exchange rate between the date used for purposes of calculating the Swiss franc amount of any proposed dividend or par value reduction and the relevant payment date.

Bermuda Law

Bermuda law, including Bermuda insurance regulations and the Companies Act, restricts the declaration and payment of dividends and the making of distributions by our Bermuda entities, unless specified requirements are met. Allied World Assurance Company, Ltd is prohibited from paying dividends of more than 25% of its total statutory capital and surplus (as shown in its previous financial year’s statutory balance sheet) without prior BMA approval. Allied World Assurance Company, Ltd is also prohibited from declaring or paying dividends without the approval of the BMA if Allied World Assurance Company, Ltd failed to meet its minimum solvency margin and minimum liquidity ratio on the last day of the previous financial year.

Furthermore, in order to reduce its total statutory capital by 15% or more, Allied World Assurance Company, Ltd would require the prior approval of the BMA. In addition, Bermuda corporate law prohibits a company from declaring or paying a dividend if there are reasonable grounds for believing that (i) the company is, or would after the payment be, unable to pay its liabilities as they become due; or (ii) the realizable value of the company’s assets would thereby be less than the aggregate of its liabilities, its issued share capital and its share premium accounts.

U.S. and Irish Law

In addition, our U.S. and Irish insurance subsidiaries are subject to significant regulatory restrictions limiting their ability to declare and pay any dividends.

In general, a U.S. insurance company subsidiary may not pay an “extraordinary” dividend or distribution until 30 days after the applicable insurance regulator has received notice of the intended payment and has not objected to, or has approved, the payment within the 30-day period. In general, an “extraordinary” dividend or distribution is defined by these laws and regulations as a dividend or distribution that, together with other dividends and distributions made within the preceding 12 months, exceeds the greater (or, in some jurisdictions, the lesser) of: (a) 10% of the insurer’s statutory surplus as of the immediately prior year end; or (b) or the statutory net income during the prior calendar year. The laws and regulations of some of these U.S. jurisdictions also prohibit an insurer from declaring or paying a dividend except out of its earned surplus. For example, payments of dividends by U.S. insurance companies are subject to restrictions on statutory surplus pursuant to state law. In addition, insurance regulators may prohibit the payment of ordinary dividends or other payments by our U.S. insurance subsidiaries (such as a payment under a tax sharing agreement or for employee or other services) if they determine that such payment could be adverse to such subsidiaries’ policyholders.

Without the consent of the CBI, Allied World Assurance Company (Europe) Limited and Allied World Assurance Company (Reinsurance) Limited are not permitted to reduce the level of their capital, may not make any dividend payments, may not make inter-company loans and must maintain a minimum solvency margin. These rules and regulations may have the effect of restricting the ability of these companies to declare and pay dividends.

In addition, we have insurance subsidiaries that are the parent company for other insurance subsidiaries, and dividends and other distributions are subject to multiple layers of the regulations discussed above as funds are pushed up to our ultimate parent company. The inability of any of our insurance subsidiaries to pay dividends in an amount sufficient to enable Allied World Assurance Company Holdings, AG to meet its cash requirements at the holding company level could have a material adverse effect on our business, our ability to transfer capital from one subsidiary to another and our ability to declare and pay dividends to our shareholders. Furthermore, Allied World Bermuda has senior notes outstanding. The inability of any of our insurance subsidiaries to pay dividends in an amount sufficient to enable Allied World Bermuda to make payments on the outstanding senior notes could have a material adverse effect on our business.

In 2010, the U.S. Congress enacted healthcare reform legislation that could have a material impact on our business.

Our U.S. insurance segment and our international insurance segment derive substantial revenues from healthcare liability underwriting in the United States, that is, providing insurance to individuals and institutions that participate in the U.S. healthcare delivery infrastructure. U.S. healthcare legislation in 2010 has and will continue to effect far-reaching changes in the healthcare delivery system and the healthcare cost reimbursement structure in the United States and could negatively impact our healthcare liability business. Additionally, future healthcare proposals could include tort reform provisions under which plaintiffs would be restricted in their ability to bring suit against healthcare providers, which could negatively impact the demand for our healthcare liability products. While the impact of this healthcare legislation or future healthcare proposals on our business is difficult to predict, any material changes in how healthcare providers insure their malpractice liability risks could have a material adverse effect on our results of operations.

In 2010, the U.S. Congress enacted the Dodd Frank Wall Street Reform and Consumer Protection Act (“Dodd-Frank Act”), which could have an impact on our business.

The Dodd-Frank Act, which effects sweeping changes to financial services regulation in the United States, was enacted in July 2010. The Dodd-Frank Act establishes the Financial Services Oversight Council (“FSOC”) and the Federal Insurance Office (“FIO”) and in limited instances authorizes the federal preemption of certain state insurance laws. The FSOC and FIO are authorized to study, monitor and report to Congress on the U.S. insurance industry and the significance of global reinsurance to the U.S. insurance market. The potential impact

of the Dodd-Frank Act on the U.S. insurance business is not clear; however, our business could be affected by changes to the U.S. system of insurance regulation or the designation of insurers or reinsurers with which we do business as systemically significant non-bank financial companies.

Other legislative, regulatory and industry initiatives could adversely affect our business.

The insurance and reinsurance regulatory framework is subject to heavy scrutiny by U.S. federal and individual state governments as well as an increasing number of international authorities. Government regulators are generally concerned with the protection of policyholders to the exclusion of other constituencies, including shareholders. Governmental authorities in the United States and worldwide seem increasingly interested in the potential risks posed by the insurance industry as a whole, and to commercial and financial systems in general. While we do not believe these inquiries have identified meaningful, new risks posed by the insurance and reinsurance industry, and while we cannot predict the exact nature, timing or scope of possible governmental initiatives, there may be increased regulatory intervention in our industry in the future. For example, the U.S. federal government has increased its scrutiny of the insurance regulatory framework in recent years, and some state legislators have considered or enacted laws that will alter and likely increase state regulation of insurance and reinsurance companies and holding companies. Moreover, the NAIC, which is an association of the insurance commissioners of all 50 states and the District of Columbia and state insurance regulators, regularly reexamine existing laws and regulations.

For example, we could be adversely affected by proposals to:

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provide insurance and reinsurance capacity in markets and to consumers that we target;

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require our participation in industry pools and guaranty associations;

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expand the scope of coverage under existing policies;

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increasingly mandate the terms of insurance and reinsurance policies;

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establish a new federal insurance regulator or financial industry systemic risk regulator;

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revise laws and regulations under which we operate, including a potential change to U.S. tax laws to disallow or limit the current tax deduction for reinsurance premiums paid by our U.S. subsidiaries to our Bermuda insurance subsidiary for reinsurance protections it provides to our U.S. subsidiaries; or

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disproportionately benefit the companies of one country over those of another.

With respect to international measures, an E.U. directive concerning the capital adequacy, risk management and regulatory reporting for insurers and reinsurers (“Solvency II”) which was adopted by the European Parliament in April 2009, may affect our insurance businesses. Implementation of Solvency II by E.U. member states is anticipated at the beginning of 2015. Implementing those measures necessary for compliance with the requirements of Solvency II may require us to utilize a significant amount of resources to ensure compliance. In addition, the capital and solvency margin requirements of Solvency II may lead to either an increase or decrease of the capital required by our E.U. domiciled insurers in order that they comply with Solvency II. Solvency II provides for the supervision of insurers and reinsurers on both a solo (entity level) and group basis. In respect of our non-E.U. subsidiaries engaging in E.U. insurance or reinsurance business, should the regulatory regime in which they are operating not be deemed equivalent to that established within the E.U. pursuant to Solvency II, additional capital requirements may be imposed in order that such companies may continue to insure or reinsure E.U. domiciled risk/cedents.

We are unable to predict the future impact on our operations of changes in the laws and regulations to which we are or may become subject. Moreover, our exposure to potential regulatory initiatives could be heightened by the fact that our principal insurance subsidiary is domiciled in, and operates exclusively from, Bermuda. For example, Bermuda, a small jurisdiction, may be disadvantaged in participating in global or cross-border regulatory matters as compared with larger jurisdictions such as the United States or the leading E.U. countries. In addition, Bermuda, which is currently an overseas territory of the United Kingdom, may consider changes to its relationship with the United Kingdom in the future. These changes could adversely affect Bermuda’s position with respect to its regulatory initiatives, which could adversely impact us commercially.

Changes in current accounting practices and future pronouncements may materially impact our reported financial results.

Developments in accounting practices, for example a convergence of U.S. GAAP with International Financial Reporting Standards, or IFRS, may require considerable additional expense to comply with, particularly if we are required to prepare information relating to prior periods for comparison purposes or to apply the new requirements retroactively. The impact of changes in current accounting practices and future pronouncements cannot be predicted, but may affect the results of our operations, including among other things, the calculation of net income.

We are subject to the U.S. Foreign Corrupt Practices Act, the U.K. Bribery Act 2010 and similar worldwide anti-bribery laws, which impose restrictions and may carry substantial penalties.

The U.S. Foreign Corrupt Practices Act, the U.K. Bribery Act 2010 and anti-bribery laws in other jurisdictions generally prohibit companies and their intermediaries from making improper payments for the purpose of obtaining or retaining business or other commercial advantage. Our corporate policies mandate compliance with these anti-bribery laws, which often carry substantial penalties. We cannot assure you that our internal control policies and procedures will protect us from reckless or other inappropriate acts committed by our directors, officers, employees, affiliates or agents. Violations of these laws, or allegations of such violations, could have a material adverse effect on our business, financial position and results of operations and could cause the market value of our common shares to decline.

Risks Related to Ownership of Our Common Shares

Future sales of our common shares may adversely affect the market price.

As of February 11, 2013, we had 34,541,409 common shares outstanding. Up to an additional 1,822,775 common shares may be issuable upon the vesting and exercise of outstanding stock options, restricted stock units and performance-based equity awards. We have filed registration statements on Form S-8 under the Securities Act of 1933, as amended (the “Securities Act”), to register common shares issued or reserved for issuance under the Allied World Assurance Company Holdings, AG Third Amended and Restated 2001 Employee Stock Option Plan, the Allied World Assurance Company Holdings, AG Third Amended and Restated 2004 Stock Incentive Plan, the Allied World Assurance Company Holdings, AG Third Amended and Restated Long-Term Incentive Plan, the Allied World Assurance Company Holdings, AG 2012 Omnibus Incentive Compensation Plan and the Allied World Assurance Company Holdings, AG Amended and Restated 2008 Employee Share Purchase Plan. Subject to the exercise of issued and outstanding stock options, shares registered under the registration statements on Form S-8 will be available for sale to the public. We cannot predict what effect, if any, future sales of our common shares, or the availability of common shares for future sale, will have on the market price of our common shares. Sales of substantial amounts of our common shares in the public market, or the perception that sales of this type could occur, could depress the market price of our common shares and may make it more difficult for you to sell your common shares at a time and price that you deem appropriate.

Our Articles of Association contain restrictions on voting, ownership and transfers of our common shares.

Our Articles of Association generally provide that shareholders have one vote for each common share held by them and are entitled to vote at all meetings of shareholders. However, the voting rights exercisable by a shareholder may be limited so that certain persons or groups are not deemed to hold 10% or more of the voting power conferred by our common shares. Moreover, these provisions could have the effect of reducing the voting power of some shareholders who would not otherwise be subject to the limitation by virtue of their direct share ownership. Our Board of Directors may refuse to register holders of shares as shareholders with voting rights based on certain grounds, including if the holder would, directly or indirectly, formally, constructively or beneficially own (as described in Articles 8 and 14 of our Articles of Association) or otherwise control voting rights with respect to 10% or more of our registered share capital recorded in the Swiss Commercial Register. In addition, our Board of Directors shall reject entry of holders of voting shares as shareholders with voting rights in

the share register or shall decide on their deregistration when the acquirer or shareholder upon request does not expressly state that it has acquired or holds the voting shares for its own account and benefit. Furthermore, our Board of Directors may cancel, with retroactive application, the registration of a shareholder with voting rights if the initial registration was on the basis of false information in the shareholder’s application. Shareholders registered without voting rights may not participate in or vote at our shareholders meetings, but will be entitled to dividends, preemptive rights and liquidation proceeds. Only shareholders that are registered as shareholders with voting rights on the relevant record date are permitted to participate in and vote at a shareholders meeting.

Anti-takeover provisions in our Articles of Association could impede an attempt to replace or remove our directors, which could diminish the value of our common shares.

Our Articles of Association contain provisions that may entrench directors and make it more difficult for shareholders to replace directors even if the shareholders consider it beneficial to do so. In addition, these provisions could delay or prevent a change of control that a shareholder might consider favorable. For example, these provisions may prevent a shareholder from receiving the benefit from any premium over the market price of our shares offered by a bidder in a potential takeover. Even in the absence of an attempt to effect a change in management or a takeover attempt, these provisions may adversely affect the prevailing market price of our common shares if they are viewed as discouraging changes in management and takeover attempts in the future.

For example, the following provisions in our Articles of Association could have such an effect:

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the election of our directors is staggered, meaning that members of only one of three classes of our directors are elected each year, thus limiting a shareholder’s ability to replace directors;

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shareholders whose shares represent 10% or more of our total voting shares will be reduced to less than 10% of the total voting power. Conversely, shareholders owning less than 10% of the total voting power may gain increased voting power as a result of these cutbacks;

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our directors may decline the registration of a shareholder as a shareholder with voting rights in the share register if and to the extent such shareholder owns or otherwise controls alone or together with others 10% of our total voting rights or if such shareholder refuses to confirm to us that it has acquired the voting shares for its own account and benefit; and

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at any time until May 3, 2014, our Board of Directors has the power to issue a number of voting shares up to 20% of our share capital registered in the Swiss Commercial Register and to limit or withdraw the preemptive rights of the existing shareholders in various circumstances.

As a shareholder of our company, you may have greater difficulties in protecting your interests than as a shareholder of a U.S. corporation.

Swiss law differs in material respects from laws generally applicable to U.S. corporations and their shareholders. Taken together with the provisions of our Articles of Association, some of these differences may result in your having greater difficulties in protecting your interests as a shareholder of our company than you would have as a shareholder of a U.S. corporation. This affects, among other things, the circumstances under which transactions involving an interested director are voidable, whether an interested director can be held accountable for any benefit realized in a transaction with our company, what approvals are required for business combinations by our company with a large shareholder or a wholly-owned subsidiary, what rights you may have as a shareholder to enforce specified provisions of Swiss corporate law or our Articles of Association, the rights of shareholders to bring class action and derivative lawsuits and the circumstances under which we may indemnify our directors and officers.

It may be difficult to enforce service of process and enforcement of judgments against us and our officers and directors.

Holdings is incorporated pursuant to the laws of Switzerland. In addition, certain of our directors and officers reside outside the United States, and all or a substantial portion of our assets and the assets of such persons are located in jurisdictions outside the United States. As such, it may be difficult or impossible to effect

service of process within the United States upon us or those persons or to recover against us or them on judgments of U.S. courts, including judgments predicated upon civil liability provisions of the U.S. federal securities laws.

We have been advised by Swiss counsel, that there is doubt as to whether the courts in Switzerland would enforce judgments of U.S. courts obtained in actions against us or our directors and officers, predicated upon the civil liability provisions of the U.S. federal securities laws or original actions brought in Switzerland against us or such persons predicated solely upon U.S. federal securities laws. Further, we have been advised by Swiss counsel that there is no treaty in effect between the United States and Switzerland providing for the enforcement of judgments of U.S. courts. Some remedies available under the laws of U.S. jurisdictions, including some remedies available under the U.S. federal securities laws, may not be allowed in Swiss courts as contrary to that jurisdiction’s public policy. Because judgments of U.S. courts are not automatically enforceable in Switzerland, it may be difficult for investors to recover against us based upon such judgments.

There are regulatory limitations on the ownership and transfer of our common shares.

The BMA must approve all issuances and transfers of securities of our Bermuda exempted companies. Before any shareholder acquires 10% or more of the voting shares, either directly or indirectly, of any of our U.S. insurance subsidiaries, that shareholder must file an acquisition statement with and obtain prior approval from the domiciliary insurance commissioner of the respective company. Similar provisions apply to our Lloyd’s corporate member. Any company or individual that, together with its or his associates, directly or indirectly acquires 10% or more of the shares in a Lloyd’s corporate member or its parent company, or is entitled to exercise or control the exercise of 10% or more of the voting power in such Lloyd’s corporate member or its parent company, would be considered to have acquired control for the purposes of the relevant legislation, as would a person who had significant influence over the management of such Lloyd’s corporate member or its parent company by virtue of his shareholding or voting power in either. In such a case, the controlling entity would be required to provide notice to Lloyd’s.

Risks Related to Taxation

U.S. taxation of our non-U.S. companies could materially adversely affect our financial condition and results of operations.

We believe that our non-U.S. companies, including our Swiss, Bermuda and Irish companies, have operated and will operate their respective businesses in a manner that will not cause them to be subject to U.S. tax (other than U.S. federal excise tax on insurance and reinsurance premiums and withholding tax on specified investment income from U.S. sources) on the basis that none of them are engaged in a U.S. trade or business. However, there are no definitive standards under current law as to those activities that constitute a U.S. trade or business and the determination of whether a non-U.S. company is engaged in a U.S. trade or business is inherently factual. Therefore, we cannot assure you that the U.S. Internal Revenue Service (the “IRS”) will not contend that a non-U.S. company is engaged in a U.S. trade or business. If any of the non-U.S. companies are engaged in a U.S. trade or business and does not qualify for benefits under the applicable income tax treaty, such company may be subject to U.S. federal income taxation at regular corporate rates on its premium income from U.S. sources and investment income that is effectively connected with its U.S. trade or business. In addition, a U.S. federal branch profits tax at the rate of 30% may be imposed on the earnings and profits attributable to such income. All of the premium income from U.S. sources and a significant portion of investment income of such company, as computed under Section 842 of the U.S. Internal Revenue Code of 1986, as amended, requiring that a foreign company carrying on a U.S. insurance or reinsurance business have a certain minimum amount of effectively connected net investment income, determined in accordance with a formula that depends, in part, on the amount of U.S. risks insured or reinsured by such company, may be subject to U.S. federal income and branch profits taxes.

If Allied World Assurance Company, Ltd, our Bermuda insurance subsidiary, or any Bermuda insurance subsidiary we form or acquire in the future is engaged in a U.S. trade or business and qualifies for benefits under the United States-Bermuda tax treaty, U.S. federal income taxation of such subsidiary will depend on whether (i) it maintains a U.S. permanent establishment and (ii) the relief from taxation under the treaty generally applies to non-premium income. We believe that our Bermuda insurance subsidiary has operated and will continue to

operate its business in a manner that will not cause it to maintain a U.S. permanent establishment. However, the determination of whether an insurance company maintains a U.S. permanent establishment is inherently factual. Therefore, we cannot assure you that the IRS will not successfully assert that our Bermuda insurance subsidiary maintains a U.S. permanent establishment. In such case, our Bermuda insurance subsidiary will be subject to U.S. federal income tax at regular corporate rates and branch profit tax at the rate of 30% with respect to its income attributable to the permanent establishment. Furthermore, although the provisions of the treaty clearly apply to premium income, it is uncertain whether they generally apply to other income of a Bermuda insurance company. Therefore, if a Bermuda insurance subsidiary of our company qualifies for benefits under the treaty and does not maintain a U.S. permanent establishment but is engaged in a U.S. trade or business, and the treaty is interpreted not to apply to income other than premium income, such subsidiary will be subject to U.S. federal income and branch profits taxes on its investment and other non-premium income as described in the preceding paragraph. In addition, a Bermuda subsidiary will qualify for benefits under the treaty only if more than 50% of its shares are beneficially owned, directly or indirectly, by individuals who are Bermuda residents or U.S. citizens or residents. Our Bermuda subsidiaries may not be able to continually satisfy such beneficial ownership test or be able to establish it to the satisfaction of the IRS.

If any of our Swiss or Irish companies are engaged in a U.S. trade or business and qualify for benefits under the relevant income tax treaty with the United States, U.S. federal income taxation of such company will depend on whether it maintains a U.S. permanent establishment. We believe that each such company has operated and will continue to operate its business in a manner that will not cause it to maintain a U.S. permanent establishment. However, the determination of whether a non-U.S. company maintains a U.S. permanent establishment is inherently factual. Therefore, we cannot assure you that the IRS will not successfully assert that any of such companies maintains a U.S. permanent establishment. In such case, the company will be subject to U.S. federal income tax at regular corporate rates and branch profits tax at the rate of 5% with respect to its income attributable to the permanent establishment.

U.S. federal income tax, if imposed, will be based on effectively connected or attributable income of a non-U.S. company computed in a manner generally analogous to that applied to the income of a U.S. corporation, except that all deductions and credits claimed by a non-U.S. company in a taxable year can be disallowed if the company does not file a U.S. federal income tax return for such year. Penalties may be assessed for failure to file such return. None of our non-U.S. companies filed U.S. federal income tax returns for the 2002 and 2001 taxable years. However, we have filed protective U.S. federal income tax returns on a timely basis for each non-U.S. company for subsequent years in order to preserve our right to claim tax deductions and credits in such years if any of such companies is determined to be subject to U.S. federal income tax.

If any of our non-U.S. companies is subject to such U.S. federal taxation, our financial condition and results of operations could be materially adversely affected.

Our U.S. subsidiaries may be subject to additional U.S. taxes in connection with our interaffiliate arrangements.

Our U.S. subsidiaries reinsure a significant portion of their insurance policies with Allied World Assurance Company, Ltd. While we believe that the terms of these reinsurance arrangements are arm’s length, we cannot assure you that the IRS will not successfully assert that the payments made by the U.S. subsidiaries with respect to such arrangements exceed arm’s length amounts. In such case, our U.S. subsidiaries will be treated as realizing additional income that may be subject to additional U.S. income tax, possibly with interest and penalties. Such excess amount may also be deemed to have been distributed as dividends to the indirect parent of the U.S. subsidiaries, Allied World Assurance Holdings (Ireland) Ltd, in which case this deemed dividend will also be subject to a U.S. federal withholding tax of 5%, assuming that the parent is eligible for benefits under the United States-Ireland income tax treaty (or a withholding tax of 30% if the parent is not so eligible). If any of these U.S. taxes are imposed, our financial condition and results of operations could be materially adversely affected. In addition, if legislation is enacted in the U.S. that limits or eliminates our ability to enter into interaffiliate arrangements, our financial condition or results of operations could be materially adversely affected.

We may not be able to make distributions or repurchase shares without subjecting you to Swiss withholding tax.

If we are not successful in our efforts to make distributions, if any, through a reduction of par value or pay dividends out of reserves from capital contributions, then any dividends paid by us will generally be subject to a Swiss federal withholding tax at a rate of 35%. The withholding tax must be withheld from the gross distribution and paid to the Swiss Federal Tax Administration. A U.S. holder that qualifies for benefits under the Convention between the United States of America and the Swiss Confederation for the Avoidance of Double Taxation with Respect to Taxes on Income may apply for a refund of the tax withheld in excess of the 15% treaty rate (or in excess of the 5% reduced treaty rate for qualifying corporate shareholders with at least 10% participation in our voting shares, or for a full refund in case of qualified pension funds). Payment of a capital distribution in the form of a par value reduction or out of reserves from capital contributions is not subject to Swiss withholding tax. However, there can be no assurance that our shareholders will approve such dividends, that we will be able to meet the other applicable legal requirements, or that Swiss withholding rules will not be changed in the future. In addition, over the long term, the amount of par value available for us to use for par value reductions or available funds out of reserves from capital contributions will be limited. If we are unable to make a distribution through a reduction in par value or pay a dividend out of reserves from capital contributions, we may not be able to make distributions without subjecting you to Swiss withholding taxes.

The repurchase of our shares to be held in treasury will generally not be subject to Swiss withholding tax. However, under Swiss law, we are generally prohibited from holding in treasury an aggregate amount of voting shares and non-voting shares in excess of 10% of our aggregate share capital, which could limit our ability to repurchase our shares in the future.

You may be subject to U.S. income taxation with respect to income of our non-U.S. companies and ordinary income characterization of gains on disposition of our shares under the controlled foreign corporation (“CFC”) rules.

Generally, each “United States shareholder” of a CFC will be subject to (i) U.S. federal income taxation on its ratable share of the CFC’s subpart F income, even if the earnings attributable to such income are not distributed, provided that such “United States shareholder” holds directly or through non-U.S. entities shares of the CFC; and (ii) potential ordinary income characterization of gains from the sale or exchange of the directly owned shares of the non-U.S. corporation. For these purposes, any U.S. person who owns directly, through non-U.S. entities, or under applicable constructive ownership rules, 10% or more of the total combined voting power of all classes of stock of any non-U.S. company will be considered to be a “United States shareholder.” An insurance company is classified as a CFC only if its “United States shareholders” own 25% or more of the vote or value of its stock. Although our non-U.S. companies may be or become CFCs, for the following reasons we believe it is unlikely that any U.S. person holding our shares directly, or through non-U.S. entities, would be subject to tax as a “United States shareholder.”

First, although certain of our principal U.S. shareholders previously owned 10% or more of our common shares, no such shareholder currently owns more than 10%. We will be classified as a CFC only if United States shareholders own 25% or more of our stock; one United States shareholder alone will not be subject to tax on subpart F income unless that shareholder owns 25% or more of our stock or there is at least one other United States shareholder that in combination with the first United States shareholder owns 25% or more of our common stock. Second, our Articles of Association provide that no individual or legal entity may, directly or through Constructive Ownership (as defined in Article 14 of our Articles of Association) or otherwise control voting rights with respect to 10% or more of our registered share capital recorded in the Swiss Commercial Register and authorize our Board of Directors to refuse to register holders of shares as shareholders with voting rights under certain circumstances. We cannot assure you, however, that the provisions of the Articles of Association referenced in this paragraph will operate as intended or that we will be otherwise successful in preventing a U.S. person from exceeding, or being deemed to exceed, these voting limitations. Accordingly, U.S. persons who hold our shares directly or through non-U.S. entities should consider the possible application of the CFC rules.

You may be subject to U.S. income taxation under the related person insurance income (“RPII”) rules.

Our non-U.S. insurance and reinsurance subsidiaries may currently insure and reinsure and may continue to insure and reinsure directly or indirectly certain of our U.S. shareholders and persons related to such shareholders. We believe that U.S. persons that hold our shares directly or through non-U.S. entities will not be subject to U.S. federal income taxation with respect to the income realized in connection with such insurance and reinsurance prior to distribution of earnings attributable to such income either on the basis (i) that RPII, determined on a gross basis, realized by each non-U.S. insurance and reinsurance subsidiary will be less than 20% of its gross insurance income in each taxable year; or (ii) that at all times during the year U.S. insureds hold less than 20% of the combined voting power of all classes of our shares entitled to vote and hold less than 20% of the total value of our shares. However, the identity of all of our shareholders, as well as some of the factors that determine the extent of RPII in any period, may be beyond our knowledge or control. For example, we may be considered to insure indirectly the risk of our shareholder if an unrelated company that insured such risk in the first instance reinsures such risk with us. Therefore, we cannot assure you that we will be successful in keeping the RPII realized by the non-U.S. insurance and reinsurance subsidiaries or the ownership of us by U.S. insureds below the 20% limit in each taxable year. Furthermore, even if we are successful in keeping the RPII or the ownership of us by U.S. insureds below the 20% limit, we cannot assure you that we will be able to establish that fact to the satisfaction of the U.S. tax authorities. If we are unable to establish that the RPII of any non-U.S. insurance or reinsurance subsidiary is less than 20% of that subsidiary’s gross insurance income in any taxable year, and no other exception from the RPII rules applies, each U.S. person who owns our shares, directly or through non-U.S. entities, on the last day of the taxable year will be generally required to include in its income for U.S. federal income tax purposes that person’s ratable share of that subsidiary’s RPII for the taxable year, determined as if that RPII were distributed proportionately to U.S. holders at that date, regardless of whether that income was actually distributed.

The RPII rules provide that if a holder who is a U.S. person disposes of shares in a foreign insurance corporation that has RPII (even if the amount of RPII is less than 20% of the corporation’s gross insurance income and the ownership of us by U.S. insureds is below 20%) and in which U.S. persons own 25% or more of the shares, any gain from the disposition will generally be treated as a dividend to the extent of the holder’s share of the corporation’s undistributed earnings and profits that were accumulated during the period that the holder owned the shares (whether or not those earnings and profits are attributable to RPII). In addition, such a shareholder will be required to comply with specified reporting requirements, regardless of the amount of shares owned. These rules should not apply to dispositions of our shares because Allied World Assurance Company Holdings, AG is not itself directly engaged in the insurance business and these rules appear to apply only in the case of shares of corporations that are directly engaged in the insurance business. We cannot assure you, however, that the IRS will interpret these rules in this manner or that the proposed regulations addressing the RPII rules will not be promulgated in final form in a manner that would cause these rules to apply to dispositions of our shares.

U.S. tax-exempt entities may recognize unrelated business taxable income (“UBTI”).

A U.S. tax-exempt entity holding our shares generally will not be subject to U.S. federal income tax with respect to dividends and gains on our shares, provided that such entity does not purchase our shares with borrowed funds. However, if a U.S. tax-exempt entity realizes income with respect to our shares under the CFC or RPII rules, as discussed above, such entity will be generally subject to U.S. federal income tax with respect to such income as UBTI. Accordingly, U.S. tax-exempt entities that are potential investors in our shares should consider the possible application of the CFC and RPII rules.

You may be subject to additional U.S. federal income taxation with respect to distributions on and gains on dispositions of our shares under the passive foreign investment company (“PFIC”) rules.

We believe that U.S. persons holding our shares should not be subject to additional U.S. federal income taxation with respect to distributions on and gains on dispositions of shares under the PFIC rules. We expect that our insurance subsidiaries will be predominantly engaged in, and derive their income from the active conduct of, an insurance business and will not hold reserves in excess of reasonable needs of their business, and therefore

qualify for the insurance exception from the PFIC rules. However, the determination of the nature of such business and the reasonableness of such reserves is inherently factual. Furthermore, we cannot assure you, as to what positions the IRS or a court might take in the future regarding the application of the PFIC rules to us. Therefore, we cannot assure you that we will not be considered to be a PFIC. If we are considered to be a PFIC, U.S. persons holding our shares could be subject to additional U.S. federal income taxation on distributions on and gains on dispositions of shares. Accordingly, each U.S. person who is considering an investment in our shares should consult his or her tax advisor as to the effects of the PFIC rules.

Application of a published IRS Revenue Ruling with respect to our insurance or reinsurance arrangements can materially adversely affect us.

The IRS published Revenue Ruling 2005-40 (the “Ruling”) addressing the requirement of adequate risk distribution among insureds in order for a primary insurance arrangement to constitute insurance for U.S. federal income tax purposes. If the IRS successfully contends that our insurance or reinsurance arrangements, including such arrangements with affiliates of our principal shareholders, and with our U.S. subsidiaries, do not provide for adequate risk distribution under the principles set forth in the Ruling, we could be subject to material adverse U.S. federal income tax consequences.

Our non-U.K. companies may be subject to U.K. tax, which may have a material adverse effect on our results of operations.

Two of our subsidiaries, Allied World Capital (Europe) Limited and 2232 Services Limited, are incorporated in the United Kingdom and, are therefore, subject to tax in the United Kingdom. None of our other companies are incorporated in the United Kingdom. Accordingly, none of our other companies should be treated as being resident in the United Kingdom for corporation tax purposes unless the central management and control of any such company is exercised in the United Kingdom. The concept of central management and control is indicative of the highest level of control of a company, which is wholly a question of fact. Each of our companies currently intend to manage our affairs so that none of our other companies are resident in the United Kingdom for tax purposes.

The rules governing the taxation of foreign companies operating in the United Kingdom through a branch or agency were amended by the Finance Act 2003. The current rules apply to the accounting periods of non-U.K. resident companies which start on or after January 1, 2003. Accordingly, a non-U.K. resident company will only be subject to U.K. corporation tax if it carries on a trade in the United Kingdom through a permanent establishment in the United Kingdom. In that case, the company is, in broad terms, taxable on the profits and gains attributable to the permanent establishment in the United Kingdom. Broadly a company will have a permanent establishment if it has a fixed place of business in the United Kingdom through which the business of the company is wholly or partly carried on or if an agent acting on behalf of the company has and habitually exercises authority in the United Kingdom to do business on behalf of the company. Each of our companies, other than Allied World Assurance Company (Reinsurance) Limited and Allied World Assurance Company (Europe) Limited (which have established branches in the United Kingdom), currently intend to operate in such a manner so that none of our companies, other than Allied World Assurance Company (Reinsurance) Limited and Allied World Assurance Company (Europe) Limited, carry on a trade through a permanent establishment in the United Kingdom.

If any of our U.S. subsidiaries were trading in the United Kingdom through a branch or agency and the U.S. subsidiaries were to qualify for benefits under the applicable income tax treaty between the United Kingdom and the United States, only those profits which were attributable to a permanent establishment in the United Kingdom would be subject to U.K. corporation tax.

If Allied World Assurance Holdings (Ireland) Ltd was trading in the United Kingdom through a branch or agency and it was entitled to the benefits of the tax treaty between Ireland and the United Kingdom, it would only be subject to U.K. taxation on its profits which were attributable to a permanent establishment in the United Kingdom. The branches established in the United Kingdom by Allied World Assurance Company (Reinsurance) Limited and Allied World Assurance Company (Europe) Limited constitute a permanent establishment of those companies and the profits attributable to those permanent establishments are subject to U.K. corporation tax.

The United Kingdom has no income tax treaty with Bermuda.

There are circumstances in which companies that are neither resident in the United Kingdom nor entitled to the protection afforded by a double tax treaty between the United Kingdom and the jurisdiction in which they are resident may be exposed to income tax in the United Kingdom (other than by deduction or withholding) on income arising in the United Kingdom (including the profits of a trade carried on there even if that trade is not carried on through a branch agency or permanent establishment), but each of our companies currently operates in such a manner that none of our companies will fall within the charge to income tax in the United Kingdom (other than by deduction or withholding) in this respect.

If any of our non-U.K. companies were treated as being resident in the United Kingdom for U.K. corporation tax purposes, or if any of our companies, other than Allied World Assurance Company (Reinsurance) Limited and Allied World Assurance Company (Europe) Limited, were to be treated as carrying on a trade in the United Kingdom through a branch agency or of having a permanent establishment in the United Kingdom, our results of operations and your investment could be materially adversely affected.

We may be subject to Irish tax, which may have a material adverse effect on our results of operations.

Companies resident in Ireland are generally subject to Irish corporation tax on their worldwide income and capital gains. None of our companies, other than our Irish companies and Allied World Assurance Holdings (Ireland) Ltd, which resides in Ireland, should be treated as being resident in Ireland unless the central management and control of any such company is exercised in Ireland. The concept of central management and control is indicative of the highest level of control of a company, and is wholly a question of fact. Each of our companies, other than Allied World Assurance Holdings (Ireland) Ltd and our Irish companies, currently intend to operate in such a manner so that the central management and control of each of our companies, other than Allied World Assurance Holdings (Ireland) Ltd and our Irish companies, is exercised outside of Ireland. Nevertheless, because central management and control is a question of fact to be determined based on a number of different factors, the Irish Revenue Commissioners might contend successfully that the central management and control of any of our companies, other than Allied World Assurance Holdings (Ireland) Ltd or our Irish companies, is exercised in Ireland. Should this occur, such company will be subject to Irish corporation tax on their worldwide income and capital gains.

The trading income of a company not resident in Ireland for Irish tax purposes can also be subject to Irish corporation tax if it carries on a trade through a branch or agency in Ireland. Each of our companies currently intend to operate in such a manner so that none of our companies carry on a trade through a branch or agency in Ireland. Nevertheless, because neither case law nor Irish legislation definitively defines the activities that constitute trading in Ireland through a branch or agency, the Irish Revenue Commissioners might contend successfully that any of our companies, other than Allied World Assurance Holdings (Ireland) Ltd and our Irish companies, is trading through a branch or agency in Ireland. Should this occur, such companies will be subject to Irish corporation tax on profits attributable to that branch or agency.

If any of our companies, other than Allied World Assurance Holdings (Ireland) Ltd and our Irish companies, were treated as resident in Ireland for Irish corporation tax purposes, or as carrying on a trade in Ireland through a branch or agency, our results of operations and your investment could be materially adversely affected.

If corporate tax rates in Ireland increase, our business and financial results could be adversely affected.

Trading income derived from the insurance and reinsurance businesses carried on in Ireland by our Irish companies is generally taxed in Ireland at a rate of 12.5%. Over the past number of years, various E.U. Member States have, from time to time, called for harmonization of corporate tax rates within the E.U. Ireland, along with other member states, has consistently resisted any movement towards standardized corporate tax rates in the E.U. The Government of Ireland has also made clear its commitment to retain the 12.5% rate of corporation tax until at least the year 2025. Should, however, tax laws in Ireland change so as to increase the general corporation tax rate in Ireland, our results of operations could be materially adversely affected.

If investments held by our Irish companies are determined not to be integral to the insurance and reinsurance businesses carried on by those companies, additional Irish tax could be imposed and our business and financial results could be adversely affected.

Based on administrative practice, taxable income derived from investments made by our Irish companies is generally taxed in Ireland at the rate of 12.5% on the grounds that such investments either form part of the permanent capital required by regulatory authorities, or are otherwise integral to the insurance and reinsurance businesses carried on by those companies. Our Irish companies intend to operate in such a manner so that the level of investments held by such companies does not exceed the amount that is integral to the insurance and reinsurance businesses carried on by our Irish companies. If, however, investment income earned by our Irish companies exceeds these thresholds, or if the administrative practice of the Irish Revenue Commissioners changes, Irish corporation tax could apply to such investment income at a higher rate (currently 25%) instead of the general 12.5% rate, and our results of operations could be materially adversely affected.

We may become subject to taxes in Bermuda after March 31, 2035, which may have a material adverse effect on our results of operations and our investment.

The Bermuda Minister of Finance, under the Exempted Undertakings Tax Protection Act 1966 of Bermuda, has given our Bermuda subsidiaries an assurance that if any legislation is enacted in Bermuda that would impose tax computed on profits or income, or computed on any capital asset, gain or appreciation, or any tax in the nature of estate duty or inheritance tax, then the imposition of any such tax will not be applicable to such entities or their operations, shares, debentures or other obligations until March 31, 2035. Given the limited duration of the Minister of Finance’s assurance, we cannot be certain that we will not be subject to any Bermuda tax after March 31, 2035.

Item 1B.

Unresolved Staff Comments.

None.

GLOSSARY OF SELECTED INSURANCE AND OTHER TERMS

Admitted insurer

An insurer that is licensed or authorized to write insurance in a particular state; to be distinguished from an insurer eligible to write excess and surplus lines insurance on risks located within a jurisdiction.

Assumed reinsurance

That portion of a risk that a reinsurer accepts from an insurer in return for a stated premium.

Attachment point

The loss point of which an insurance or reinsurance policy becomes operative and below which any losses are retained by either the insured or other insurers or reinsurers, as the case may be.

Acquisition costs

Comprised of commissions, brokerage fees and insurance taxes. Commissions and brokerage fees are usually calculated as a percentage of premiums and depend on the market and line of business. Acquisition costs are reported after (1) deducting commissions received on ceded reinsurance, (2) deducting the part of acquisition costs relating to unearned premiums and (3) including the amortization of previously deferred acquisition costs.

Acquisition cost ratio

Calculated by dividing “acquisition costs” by “net premiums earned”.

Capacity

The maximum percentage of surplus, or the dollar amount of exposure, that an insurer or reinsurer is willing or able to place at risk. Capacity may apply to a single risk, a program, a line of business or an entire portfolio of business. Capacity may be constrained by legal restrictions, corporate restrictions or indirect restrictions.

Case reserves

Loss reserves, established with respect to specific, individual reported claims.

Casualty lines

Insurance that is primarily concerned with losses due to injuries to persons and liability imposed on the insured for such injury or for damage to the property of others.

Catastrophe exposure or event

A severe loss, typically involving multiple claimants. Common perils include earthquakes, hurricanes, tsunamis, hailstorms, severe winter weather, floods, fires, tornadoes, explosions and other natural or man-made disasters. Catastrophe losses may also arise from acts of war, acts of terrorism and political instability.

Catastrophe reinsurance

A form of excess-of-loss reinsurance that, subject to a specified limit, indemnifies the ceding company for the amount of loss in excess of a specified retention with respect to an accumulation of losses resulting from a catastrophic event. The actual reinsurance document is called a “catastrophe cover.” These reinsurance contracts are typically designed to cover property insurance losses but can be written to cover other types of insurance losses such as workers’ compensation policies.

Cede, cedent, ceding company

When an insurer transfers some or all of its risk to a reinsurer, it “cedes” business and is referred to as the “ceding company” or “cedent.”

Combined ratio

Calculated as the sum of the “loss and loss expense ratio”, the “acquisition cost ratio” and the “general and administrative expense ratio”.

Commercial coverage

Insurance products that are sold to entities and individuals in their business or professional capacity, and which are intended for other than the insured’s personal or household use.

Deductible

The amount of exposure an insured retains on any one risk or group of risks. The term may apply to an insurance policy, where the insured is an individual or business, or a reinsurance contract, where the insured is an insurance company. See “Retention.”

Direct insurance

Insurance sold by an insurer that contracts directly with the insured, as distinguished from reinsurance.

Directors and officers liability

Insurance that covers liability for corporate directors and officers for wrongful acts, subject to applicable exclusions, terms and conditions of the policy.

Earned premiums or Premiums earned

That portion of premiums written that applies to the expired portion of the policy term. Earned premiums are recognized as revenues under both statutory accounting practice and U.S. GAAP.

Employment practices liability insurance

Insurance that primarily provides liability coverage to organizations and their employees for losses arising from acts of discrimination, harassment and retaliation against current and prospective employees of the organization.

Errors and omissions insurance

Insurance that provides liability coverage for claims arising from professional negligence or malpractice, subject to applicable exclusions, terms and conditions of the policy.

Excess and surplus lines

A risk or a part of a risk for which there is no insurance market available among admitted insurers; or insurance written by non-admitted insurance companies to cover such risks.

Excess layer

Insurance to cover losses in one or more layers above a certain amount with losses below that amount usually covered by the insured’s primary policy and its self-insured retention.

Excess-of-loss reinsurance

Reinsurance that indemnifies the insured against all or a specified portion of losses over a specified amount or “retention.”

Exclusions

Provisions in an insurance or reinsurance policy excluding certain risks or otherwise limiting the scope of coverage.

Expense ratio

Calculated by adding the “acquisition cost ratio” and the “general and administrative cost ratio”.

Exposure

The possibility of loss. A unit of measure of the amount of risk a company assumes.

Facultative reinsurance

The reinsurance of all or a portion of the insurance provided by a single policy. Each policy reinsured is separately negotiated.

Fiduciary liability insurance

Insurance that primarily provides liability coverage to fiduciaries of employee benefit and welfare plans for losses arising from the breach of any fiduciary duty owed to plan beneficiaries.

Frequency

The number of claims occurring during a specified period of time.

General and administrative expense ratio

Calculated by dividing “general and administrative expenses” by “net premiums earned”.

General casualty

Insurance that is primarily concerned with losses due to injuries to persons and liability imposed on the insured for such injury or for damage to the property of others.

Gross premiums written

Total premiums for insurance and reinsurance written during a given period.

Healthcare liability or Healthcare lines

Insurance coverage, often referred to as medical malpractice insurance, which addresses liability risks of doctors, surgeons, nurses, other healthcare professionals and the institutions (hospitals, clinics) in which they practice.

Incurred but not reported (“IBNR”) reserves

Reserves established by us for claims that have occurred but have not yet been reported to us as well as for changes in the values of claims that have been reported to us but are not yet settled.

In-force

Policies that have not expired or been terminated and for which the insurer remains on risk as of a given date.

Limits or gross maximum limits

The maximum amount that an insurer or reinsurer will insure or reinsure for a specified risk, a portfolio of risks or on a single insured entity. The term also refers to the maximum amount of benefit payable for a given claim or occurrence.

Loss development

The difference between the original loss as initially reserved by an insurer or reinsurer and its subsequent evaluation at a later date or at the time of its closure. Loss development occurs because of inflation and time lags between the occurrence of claims and the time they are actually reported to an insurer or reinsurer. To account for these increases, a “loss development factor” or multiplier is usually applied to a claim or group of claims in an effort to more accurately project the ultimate amount that will be paid.

Losses incurred

The total losses and loss adjustment expenses paid, plus the change in loss and loss adjustment expense reserves, including IBNR, sustained by an insurance or reinsurance company under its insurance policies or other insurance or reinsurance contracts.

Losses and loss expense ratio

Calculated by dividing net “losses and loss expenses” by “net premiums earned”.

Losses and loss expenses

“Losses” are an occurrence that is the basis for submission or payment of a claim. Losses may be covered, limited or excluded from coverage, depending on the terms of the insurance policy or other insurance or reinsurance contracts. “Loss expenses” are the expenses incurred by an insurance or reinsurance company in settling a loss.

Loss reserves

Liabilities established by insurers and reinsurers to reflect the estimated cost of claims incurred that the insurer or reinsurer will ultimately be required to pay. Reserves are established for losses and for loss expenses, and consist of case reserves and IBNR reserves. As the term is used in this Form 10-K, “loss reserves” is meant to include reserves for both losses and for loss expenses.

Loss year

The year to which a claim is attributed based upon the terms in the underlying policy or contract. All years referred to are years ending December 31.

Net premiums earned

The portion of net premiums written during or prior to a given period that was recognized as income during such period.

Net premiums written

Gross premiums written, less premiums ceded to reinsurers.

Paid losses

Claim amounts paid to insureds or ceding companies.

Per occurrence limitations

The maximum amount recoverable under an insurance or reinsurance policy as a result of any one event, regardless of the number of claims.

Primary insurance (primary layer)

Insurance that absorbs the losses immediately above the insured’s retention layer. A primary insurer will pay up to a certain dollar amount of losses over the insured’s retention, at which point a higher layer excess insurer will be liable for additional losses. The coverage terms of a primary insurance layer typically assume an element of regular loss frequency.

Probable maximum loss (“PML”)

An estimate of the loss on any given insurance policy or group of policies at some pre-defined probability of occurrence. The probability of occurrence is usually expressed in terms of the number of years between loss events of that size (e.g., 1 in 100 years or 1 in 200 years).

Producer

A licensed professional, often referred to as an insurance agent, insurance broker or intermediary, who acts as intermediary between the insurance carrier and the insured or reinsured (as the case may be).

Product liability

Insurance that provides coverage to manufacturer and/or distributors of tangible goods against liability for personal injury caused if such products are unsafe or defective.

Professional liability

Insurance that provides liability coverage to directors and officers, attorneys, doctors, accountants and other professionals who offer services to the general public and claim expertise in a particular area greater than the ordinary layperson for their negligence or malfeasance.

Property catastrophe coverage

In reinsurance, coverage that protects the ceding company against accumulated losses in excess of a stipulated sum that arise from a catastrophic event such as an earthquake, fire or windstorm. “Catastrophe loss” generally refers to the total loss of an insurer arising out of a single catastrophic event.

Quota share reinsurance

A proportional reinsurance treaty in which the ceding company cedes an agreed-on percentage of every risk it insures that falls within a class or classes of business subject to the treaty.

Reinsurance

The practice whereby one insurer, called the reinsurer, in consideration of a premium paid to that reinsurer, agrees to indemnify another insurer, called the ceding company, for part or all of the liability of the ceding company under one or more policies or contracts of insurance that it has issued.

Reserves

Liabilities established by insurers and reinsurers to reflect the estimated cost of claims incurred that the insurer or reinsurer will ultimately be required to pay. Reserves are established for losses and for loss expenses, and consist of case reserves and IBNR reserves. As the term is used in this report, “reserves” are meant to include reserves for both losses and for loss expenses.

Retention

Retrocessional coverage

A transaction whereby a reinsurer cedes to another reinsurer, the retrocessionaire, all or part of the reinsurance that the first reinsurer has assumed. Retrocessional reinsurance does not legally discharge the ceding reinsurer from its liability with respect to its obligations to the reinsured. Reinsurance companies cede risks to retrocessionaires for reasons similar to those that cause insurers to purchase reinsurance: to reduce net liability on individual risks, to protect against catastrophic losses, to stabilize financial ratios and to obtain additional underwriting capacity.

Run-off

Liability of an insurance or reinsurance company for existing claims that it expects to pay in the future and for which a loss reserve has been established.

Self-insured

A term which describes a risk, or part of a risk, retained by the insured in lieu of transferring the risk to an insurer. A policy deductible or retention feature allows a policyholder to self-insure a portion of an exposure and thereby reduce its risk-transfer costs.

Specialty lines

A term used in the insurance and reinsurance industry to describe types of insurance or classes of business that require specialized expertise to underwrite. Insurance and reinsurance for these classes of business is not widely available and is typically purchased from the specialty lines divisions of larger insurance companies or from small specialty lines insurers.

Subpart F income

Insurance and reinsurance income (including underwriting and investment income) and foreign personal holding company income (including interest, dividends and other passive investment income).

Surplus (or statutory surplus)

As determined under statutory accounting principles, the amount remaining after all liabilities, including loss reserves, are subtracted from all of the “admitted” assets (i.e., those permitted by regulation to be recognized on the statutory balance sheet). Surplus is also referred to as “statutory surplus” or “surplus as regards policyholders” for statutory accounting purposes.

Surplus lines

A risk or a part of a risk for which there is no insurance market available among admitted insurers or insurance written by non-admitted insurance companies to cover such risks.

“Swing-rated” reinsurance contract

A reinsurance contract, that links the ultimate amount of ceded premium to the ultimate loss ratio on the reinsured business. This type of reinsurance contract enables the cedent to retain a greater portion of premium if the ultimate loss ratio develops at a level below the initial loss threshold set by the reinsurers, but requires a higher amount of ceded premium if the ultimate loss ratio develops above the initial threshold.

Treaties

Reinsurance contracts under which the ceding company agrees to cede and the reinsurer agrees to assume risks of a particular class or classes of business.

Treaty year

The year in which the contract incepts. Exposure from contracts incepting during the current treaty year will potentially affect both the current loss year as well future loss years.

Ultimate loss

Total of all expected settlement amounts, whether paid or reserved together with any associated loss adjustment expenses, and is the estimated total amount of loss at the measurement date. For purposes of this Form 10-K, “ultimate loss” is the sum of paid losses, case reserves and IBNR.

Underwriter

An employee of an insurance or reinsurance company who examines, accepts or rejects risks and classifies accepted risks in order to charge an appropriate premium for each accepted risk. The underwriter is expected to select business that will produce an average risk of loss no greater than that anticipated for the class of business.

Underwriting results

The pre-tax profit or loss experienced by an insurance company that is calculated by deducting net losses and loss expenses, net acquisition costs and general and administration expenses from net premiums earned. This profit or loss calculation includes reinsurance assumed and ceded but excludes investment income.

Unearned premium

The portion of premiums written that is allocable to the unexpired portion of the policy term or underlying risk.

Working layer

Primary insurance that absorbs the losses immediately above the insured’s retention layer. A working layer insurer will pay up to a certain dollar amount of losses over the insured’s retention, at which point a higher layer excess insurer will be liable for additional losses. The coverage terms of a working layer typically assume an element of loss frequency.

Item 2.

Properties.

Our corporate headquarters are located in offices we lease in Switzerland. We also lease space in Bermuda, England, Hong Kong, Ireland, Singapore and the United States for the operation of our U.S. insurance, international insurance and reinsurance segments. Our leases have remaining terms ranging from nine months to approximately nine years in length. We renew and enter into new leases in the ordinary course of business as needed. While we believe that the office space from these leased properties is sufficient for us to conduct our operations for the foreseeable future, we may need to expand into additional facilities to accommodate future growth. For more information on our leasing arrangements, please see Note 14 of the notes to the consolidated financial statements in this Form 10-K.

Item 3.

Legal Proceedings.

New Cingular Wireless

In April 2006, a complaint was filed in the U.S. District Court for the Northern District of Georgia (Atlanta Division) entitled New Cingular Wireless Headquarters, LLC et al. v. Marsh & McLennan Companies, Inc., et al. Our Bermuda insurance subsidiary, Allied World Assurance Company, Ltd, was among the 78 insurers named as defendants. Plaintiffs alleged that the broker defendants used a variety of illegal schemes and anti-competitive practices that resulted in the plaintiffs either paying more for insurance products or receiving less beneficial terms than the competitive market would have produced. The parties entered into a settlement and release agreement as of December 2, 2012, the terms of which are confidential. The settlement did not have a material adverse effect on the Company’s results of operations, financial position or cash flow.

Litigation Related to the Terminated Merger Agreement with Transatlantic

In connection with our proposed merger with Transatlantic Holdings, Inc. (“Transatlantic”), which was mutually terminated by the parties on September 15, 2011, two putative stockholder class action lawsuits filed against Holdings, and the members of the Transatlantic board of directors challenging the merger, remained outstanding as of December 31, 2012: Ivers v. Transatlantic Holdings, Inc., et al. (filed June 17, 2011 in the Court of Chancery of the State of Delaware) and Kramer v. Transatlantic Holdings, Inc., et al. (filed June 30, 2011 in the Court of Chancery of the State of Delaware) (collectively, the “Lawsuits”). Each of the Lawsuits was filed against Transatlantic, the members of the Transatlantic board of directors, and Holdings and/or its subsidiaries. Alleghany Corporation and Shoreline Merger Sub, LLC were later added as defendants. Plaintiffs in each Lawsuit asserted that the members of the Transatlantic board of directors breached their fiduciary duties and that Holdings and/or its subsidiaries, or Alleghany Corporation and/or its subsidiaries, aided and abetted the alleged breaches of fiduciary duties. On October 12, 2012, the parties entered into a stipulation and agreement of compromise and settlement, which is currently pending approval by the Court of Chancery of the State of Delaware. There can be no assurance that the Court of Chancery of the State of Delaware will approve the settlement.

The company, in common with the insurance industry in general, is subject to litigation and arbitration in the normal course of its business. These legal proceedings generally relate to claims asserted by or against the company in the ordinary course of insurance or reinsurance operations. Estimated amounts payable under these proceedings are included in the reserve for losses and loss expenses in the company’s consolidated balance sheets. As of December 31, 2012, the company was not a party to any material legal proceedings arising outside the ordinary course of business that management believes will have a material adverse effect on the company’s results of operations, financial position or cash flow.

Item 4.

Mine Safety Disclosures.

Not applicable.

PART II

Item 5.

Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Our common shares are publicly traded on the New York Stock Exchange under the symbol “AWH”. The following table sets forth, for the periods indicated, the high and low sales prices per share of our common shares as reported on the New York Stock Exchange Composite Tape.


	High		Low
*2012:*
First quarter	$	71.34	$	60.80
Second quarter	$	79.55	$	67.84
Third quarter	$	80.10	$	74.32
Fourth quarter	$	84.17	$	76.12

*2011:*
First quarter	$	63.95	$	57.67
Second quarter	$	65.70	$	53.70
Third quarter	$	59.00	$	49.00
Fourth quarter	$	63.33	$	51.00

On February 11, 2013, the last reported sale price for our common shares was $87.21 per share. At February 11, 2013, there were 32 holders of record of our common shares.

The following dividends were paid during 2012 and 2011:


Dividend Paid	Partial Par Value Reduction Per Share			Dividend Per Share
December 18, 2012		CHF	0.34	$	0.375
September 25, 2012		CHF	0.35	$	0.375
August 6, 2012		CHF	0.36	$	0.375
April 6, 2012		CHF	0.34	$	0.375
January 6, 2012		CHF	0.35	$	0.375
October 7, 2011		CHF	0.32	$	0.375
August 5, 2011		CHF	0.30	$	0.375

At the Annual Shareholder Meeting in May 2011, our shareholders approved the payment of a cash dividend to shareholders in four quarterly installments in the form of distributions through par value reductions, each of which were $0.375 per share.

At the Annual Shareholder Meeting in May 2012, our shareholders approved the payment of a cash dividend to shareholders in four quarterly installments in the form of distributions through par value reductions, each of which were $0.375 per share. The fourth installment of the dividend is anticipated to be paid in March 2013.

The continued declaration and payment of dividends to holders of common shares is expected but will be at the discretion of our Board of Directors and subject to legal, regulatory, financial and other restrictions. Specifically, any future declaration and payment of any cash dividends by the company will:

•

depend upon its results of operations, financial condition, cash requirements and other relevant factors;

•

be subject to shareholder approval;

•

be subject to restrictions contained in our credit facilities and other debt covenants; and

•

be subject to other restrictions on dividends imposed by Swiss law.

Under Swiss law, our shareholders have the power to declare dividends without the agreement of the Board of Directors. Consequently, dividends may be declared by resolution of the shareholders even if our Board of Directors and management do not believe it is in the best interest of the company or the shareholders. As a holding company, our principal source of income is dividends or other statutorily permissible payments from our subsidiaries. The ability of our subsidiaries to pay dividends is limited by the applicable laws and regulations of the various countries in which we operate, including Bermuda, the United States and Ireland. See Item 1. “Business — Regulatory Matters,” Item 1A. Risk Factors — Our holding company structure and regulatory and other constraints affect our ability to pay dividends and make other payments,” Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Liquidity and Capital Resources — Pledged Assets” and Note 15 of the notes to consolidated financial statements included in this Form 10-K.

Issuer Purchases of Equity Securities

The following table summarizes our repurchases of our common shares during the three months ended December 31, 2012:


Period	Total Number of Shares Purchased		Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		Maximum Dollar Value (or Approximate Dollar Value) of Shares that May Yet be Purchased Under the Plans or Programs
October 1 — 31, 2012		209,924	$	80.52		209,924	$	450,223,890
November 1 — 30, 2012		253,991		78.72		253,991		430,230,664
December 1 — 31, 2012		249,959		80.01		249,959		410,230,733

Total		713,874	$	79.70		713,874	$	410,230,733

(1)	At the 2012 Annual Shareholder Meeting on May 3, 2012, Holdings’ shareholders approved a new, two-year $500 million share repurchase program. Share repurchases may be effected from time to time through open market purchases, privately negotiated transactions, tender offers or otherwise.

PERFORMANCE GRAPH

The following information is not deemed to be “soliciting material” or to be “filed” with the SEC or subject to the liabilities of Section 18 of the Exchange Act, and the report shall not be deemed to be incorporated by reference into any prior or subsequent filing by the company under the Securities Act or the Exchange Act.

The following graph shows the cumulative total return, including reinvestment of dividends, on the common shares compared to such return for Standard & Poor’s 500 Composite Stock Price Index (“S&P 500”), and Standard & Poor’s Property & Casualty Insurance Index for the five year period beginning on December 31, 2007 and ending on December 31, 2012, assuming $100 was invested on December 31, 2007. The measurement point on the graph represents the cumulative shareholder return as measured by the last reported sale price on such date during the relevant period.

TOTAL RETURN TO SHAREHOLDERS

(INCLUDES REINVESTMENT OF DIVIDENDS)

LOGO

Item 6.

Selected Financial Data.

The following table sets forth our summary historical statement of operations data and summary balance sheet data as of and for the years ended December 31, 2012, 2011, 2010, 2009 and 2008. Statement of operations data and balance sheet data are derived from our audited consolidated financial statements, which have been prepared in accordance with U.S. GAAP. These historical results are not necessarily indicative of results to be expected from any future period. For further discussion of this risk see Item 1A. “Risk Factors” in this Form 10-K. You should read the following selected financial data in conjunction with the other information contained in this Form 10-K, including Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Item 8. “Financial Statements and Supplementary Data”.


	Year Ended December 31,
	2012		2011 (1)		2010 (2)			2009			2008 (3)
	($ in millions, except per share amounts)
Summary Statement of Operations Data:
Gross premiums written	$	2,329.3	$	1,939.5	$	1,758.4		$	1,696.3		$	1,445.6

Net premiums written	$	1,837.8	$	1,533.8	$	1,392.4		$	1,321.1		$	1,107.2

Net premiums earned	$	1,748.9	$	1,457.0	$	1,359.5		$	1,316.9		$	1,117.0
Net investment income		167.1		195.9		244.1			300.7			308.8
Net realized investment gains (losses)		306.4		10.1		285.6			126.4			(60.0	)
Net impairment charges recognized in earnings		—		—		(0.2	)		(49.6	)		(212.9	)
Other income		—		101.7		0.9			1.5			0.7

Total revenues	$	2,222.4	$	1,764.7	$	1,889.9		$	1,695.9		$	1,153.6
Net losses and loss expenses		1,139.3		959.2		707.9			604.1			641.1
Total expenses		1,711.0		1,459.2		1,198.0			1,052.4			977.6

Income before income taxes	$	511.4	$	305.5	$	691.9		$	643.5		$	176.0
Income tax expense (benefit)		18.4		31.0		26.9			36.6			(7.6	)

Net income	$	493.0	$	274.5	$	665.0		$	606.9		$	183.6

Per Share Data:
Basic earnings per share	$	13.67	$	7.21	$	14.30		$	12.26		$	3.75
Diluted earnings per share	$	13.30	$	6.92	$	13.32		$	11.67		$	3.59
Dividends paid per share	$	1.875	$	0.750	$	1.050		$	0.740		$	0.720


	Year Ended December 31,
	2012			2011 (1)			2010 (2)			2009			2008 (3)
Selected Ratios:
Loss and loss expense ratio		65.1	%		65.8	%		52.1	%		45.9	%		57.4	%
Acquisition cost ratio		11.8	%		11.5	%		11.7	%		11.3	%		10.1	%
General and administrative expense ratio		17.6	%		18.6	%		21.1	%		18.9	%		16.6	%

Expense ratio		29.4	%		30.1	%		32.8	%		30.2	%		26.7	%

Combined ratio		94.5	%		95.9	%		84.9	%		76.1	%		84.1	%


	As of December 31,
	2012			2011 (1)			2010 (2)			2009			2008 (3)
	($ in millions)
Summary Balance Sheet Data:
Cash and cash equivalents	$	681.9		$	634.0		$	757.0		$	292.2		$	655.8
Investments		7,933.9			7,406.6			7,183.6			7,156.3			6,157.1
Reinsurance recoverable		1,141.1			1,002.9			927.6			920.0			888.3
Total assets		12,029.9			11,122.2			10,427.6			9,653.2			9,022.5
Reserve for losses and loss expenses		5,645.5			5,225.1			4,879.2			4,761.8			4,576.8
Unearned premiums		1,218.0			1,078.4			962.2			928.6			930.4
Total debt		798.2			797.9			797.7			498.9			742.5
Total shareholders’ equity	$	3,326.3		$	3,149.0		$	3,075.8		$	3,213.3		$	2,416.9

(1)	Other income for the year ended December 31, 2011 includes termination fees (net of expenses) of $101.7 million related to the termination of the previously announced merger agreement with Transatlantic.

(2)

Effective July 1, 2010, the Company elected the fair value option for any investment in a beneficial interest in a securitized asset. As a result, the Company elected the fair value option for all of its mortgage-backed and asset-backed securities held as of June 30, 2010. On July 1, 2010, the Company reclassified net unrealized gains of $41.9 million from “accumulated other comprehensive income” to “retained earnings”. As a result of the fair value election, any change in fair value of the mortgage-backed and asset-backed securities is recognized in “net realized investment gains” on the consolidated income statement.

(3)	Darwin is included in the Company’s consolidated results only for the three months ended December 31, 2008 and subsequent fiscal year ends.

Item 7.

Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Some of the statements in this Form 10-K include forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995 that involve inherent risks and uncertainties. These statements include in general forward-looking statements both with respect to us and the insurance industry. Statements that are not historical facts, including statements that use terms such as “anticipates,” “believes,” “expects,” “intends,” “plans,” “projects,” “seeks” and “will” and that relate to our plans and objectives for future operations, are forward-looking statements. In light of the risks and uncertainties inherent in all forward-looking statements, the inclusion of such statements in this Form 10-K should not be considered as a representation by us or any other person that our objectives or plans will be achieved. These statements are based on current plans, estimates and expectations. Actual results may differ materially from those projected in such forward-looking statements and therefore you should not place undue reliance on them. Important factors that could cause actual results to differ materially from those in such forward-looking statements are set forth in Item 1A. “Risk Factors” in this Form 10-K. We undertake no obligation to release publicly the results of any future revisions we make to the forward-looking statements to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Overview

Our Business

We write a diversified portfolio of property and casualty insurance and reinsurance internationally through our subsidiaries and branches based in Bermuda, Europe, Hong Kong, Singapore and the United States as well as our Lloyd’s Syndicate 2232. We manage our business through three operating segments: U.S. insurance, international insurance and reinsurance. As of December 31, 2012, we had approximately $12.0 billion of total assets, $3.3 billion of total shareholders’ equity and $4.1 billion of total capital, which includes shareholders’ equity and senior notes.

During the year ended December 31, 2012, we continued to experience rate increases on property lines that had experienced significant loss activity in the prior year. We also continued to see rate improvement during the year on some of our casualty lines of business in certain jurisdictions. We believe that there are opportunities where certain products have attractive premium rates and that the expanded breadth of our operations allows us to target those classes of business. Given these trends, we continue to be selective in the insurance policies and reinsurance contracts we underwrite. Our consolidated gross premiums written increased by $389.8 million, or 20.1%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. Our net income increased by $218.5 million to $493.0 million compared to the year ended December 31, 2011. The increase resulted from the improvement in underwriting results, as catastrophe losses were $112.6 million lower, combined with a $296.3 million increase in our realized investment gains as markets and economic conditions rebounded during the year, partially offset by the $101.7 million reduction in other income.

Recent Developments

We reported a net loss of $41.1 million for the three months ended December 31, 2012 compared to net income of $183.1 million for the three months ended December 31, 2011, a decrease of $224.2 million.

The decrease in net income was due to the following:

•

For the three months ended December 31, 2012, we incurred $166.1 million of pre-tax catastrophe-related losses from Superstorm Sandy (net of estimated reinstatement premiums) compared to $59.1 million of pre-tax catastrophe-related losses for the three months ended December 31, 2011 related to the flooding in Thailand that occurred in the fourth quarter of 2011 and from other catastrophes that occurred earlier in 2011, an increase of $107.0 million.

•

Net favorable reserve development related to prior years decreased $59.6 million to $32.8 million for the three months ended December 31, 2012 from $92.4 million for the same period in 2011.

•

The three months ended December 31, 2011 included non-recurring termination fee income of $66.7 million from our previously-announced merger agreement with Transatlantic.

•

Net realized investment gains decreased by $17.2 million.

•

Income tax expense decreased by $12.2 million as a result of the items described above.

During the three months ended December 31, 2012, we completed four strategic investments through AWFS in Cunningham Lindsey, MatlinPatterson, Aeolus Capital Management and Crescent Capital Group. Our goal with AWFS is to invest in strategic business opportunities that we believe will complement our core insurance and reinsurance operations and diversify our revenues.

Financial Highlights


	Year Ended December 31,
	2012			2011			2010
	($ in millions, except share, per share and percentage data)
Gross premiums written	$	2,329.3		$	1,939.5		$	1,758.4
Net income		493.0			274.5			665.0
Operating income		202.7			183.7			397.8
Basic earnings per share:
Net income	$	13.67		$	7.21		$	14.30
Operating income	$	5.62		$	4.82		$	8.56
Diluted earnings per share:
Net income	$	13.30		$	6.92		$	13.32
Operating income	$	5.47		$	4.63		$	7.97
Weighted average common shares outstanding:
Basic		36,057,145			38,093,351			46,491,279
Diluted		37,069,885			39,667,905			49,913,317
Basic book value per common share	$	95.59		$	83.44		$	80.75
Diluted book value per common share	$	92.59		$	80.11		$	74.29
Annualized return on average equity (ROAE), net income		15.3	%		8.9	%		21.9	%
Annualized ROAE, operating income		6.3	%		6.0	%		13.1	%

Non-GAAP Financial Measures

In presenting the company’s results, management has included and discussed certain non-GAAP financial measures, as such term is defined in Item 10(e) of Regulation S-K promulgated by the SEC. Management believes that these non-GAAP measures, which may be defined differently by other companies, better explain the Company’s results of operations in a manner that allows for a more complete understanding of the underlying trends in the Company’s business. However, these measures should not be viewed as a substitute for those determined in accordance with U.S. GAAP.

Operating income & operating income per share

Operating income is an internal performance measure used in the management of our operations and represents after-tax operational results excluding, as applicable, net realized investment gains or losses, net impairment charges recognized in earnings, net foreign exchange gain or loss and other non-recurring items. We exclude net realized investment gains or losses, net impairment charges recognized in earnings, net foreign exchange gain or loss and other non-recurring items from our calculation of operating income because these amounts are heavily influenced by and fluctuate in part according to the availability of market opportunities and other factors. We have excluded from our operating income the aggregate $101.7 million termination fee we

received from Transatlantic in 2011 as this is a non-recurring item. In addition to presenting net income determined in accordance with U.S. GAAP, we believe that showing operating income enables investors, analysts, rating agencies and other users of our financial information to more easily analyze our results of operations and our underlying business performance. Operating income should not be viewed as a substitute for U.S. GAAP net income. The following is a reconciliation of operating income to its most closely related U.S. GAAP measure, net income.


	Year Ended December 31,
	2012			2011			2010
	($ in millions, except per share data)
Net income	$	493.0		$	274.5		$	665.0
Add after tax effect of:
Net realized investment gains		(291.1	)		(0.2	)		(267.7	)
Net impairment charges recognized in earnings		—			—			0.1
Other income — termination fee		—			(93.7	)		—
Foreign exchange loss		0.8			3.1			0.4

Operating income	$	202.7		$	183.7		$	397.8

Basic per share data:
Net income	$	13.67		$	7.21		$	14.30
Add after tax effect of:
Net realized investment gains		(8.07	)		(0.01	)		(5.75	)
Other income — termination fee		—			(2.46	)		—
Foreign exchange loss		0.02			0.08			0.01

Operating income	$	5.62		$	4.82		$	8.56

Diluted per share data:
Net income	$	13.30		$	6.92		$	13.32
Add after tax effect of:
Net realized investment gains		(7.85	)		(0.01	)		(5.36	)
Other income — termination fee		—			(2.36	)		—
Foreign exchange loss		0.02			0.08			0.01

Operating income	$	5.47		$	4.63		$	7.97

Diluted book value per share

We have included diluted book value per share because it takes into account the effect of dilutive securities; therefore, we believe it is an important measure of calculating shareholder returns.


	As of December 31,
	2012			2011			2010
	($ in millions, except share and per share data)
Price per share at period end	$	78.80		$	62.93		$	59.44
Total shareholders’ equity	$	3,326.3		$	3,149.0		$	3,075.8
Basic common shares outstanding		34,797,781			37,742,131			38,089,226
Add:
Unvested restricted share units		135,123			249,251			571,178
Performance based equity awards		485,973			889,939			1,440,017
Employee share purchase plan		10,750			11,053			10,576
Dilutive options/warrants outstanding		1,224,607			1,525,853			3,272,739
Weighted average exercise price per share	$	47.02		$	45.72		$	35.98
Deduct:
Options bought back via treasury method		(730,652	)		(1,108,615	)		(1,980,884	)

Common shares and common share equivalents outstanding		35,923,582			39,309,612			41,402,852
Basic book value per common share	$	95.59		$	83.44		$	80.75
Diluted book value per common share	$	92.59		$	80.11		$	74.29

Annualized return on average equity

Annualized return on average shareholders’ equity (“ROAE”) is calculated using average shareholders’ equity, excluding the average after tax unrealized gains or losses on investments. We present ROAE as a measure that is commonly recognized as a standard of performance by investors, analysts, rating agencies and other users of our financial information.

Annualized operating return on average shareholders’ equity is calculated using operating income and average shareholders’ equity, excluding the average after tax unrealized gains or losses on investments.


	Year Ended December 31,
	2012			2011			2010
	($ in millions)
Opening shareholders’ equity	$	3,149.0		$	3,075.8		$	3,213.3
Deduct: accumulated other comprehensive income		(14.5	)		(57.1	)		(149.8	)

Adjusted opening shareholders’ equity	$	3,134.5		$	3,018.7		$	3,063.5
Closing shareholders’ equity	$	3,326.3		$	3,149.0		$	3,075.8
Deduct: accumulated other comprehensive income		—			(14.5	)		(57.1	)

Adjusted closing shareholders’ equity	$	3,326.3		$	3,134.5		$	3,018.7
Average shareholders’ equity	$	3,230.4		$	3,076.6		$	3,041.1
Net income available to shareholders	$	493.0		$	274.5		$	665.0
Annualized return on average shareholders’ equity — net income available to shareholders		15.3	%		8.9	%		21.9	%

Operating income available to shareholders	$	202.7		$	183.7		$	397.8
Annualized return on average shareholders’ equity — operating income available to shareholders		6.3	%		6.0	%		13.1	%

Relevant Factors

Revenues

We derive our revenues primarily from premiums on our insurance policies and reinsurance contracts, net of any reinsurance or retrocessional coverage purchased. Insurance and reinsurance premiums are a function of the amounts and types of policies and contracts we write, as well as prevailing market prices. Our prices are determined before our ultimate costs, which may extend far into the future, are known. In addition, our revenues include income generated from our investment portfolio, consisting of net investment income and net realized investment gains or losses. Investment income is principally derived from interest and dividends earned on investments, partially offset by investment management and custodial expenses and fees paid to our custodian bank. Net realized investment gains or losses include gains or losses from the sale of investments, as well as the change in the fair value of investments that we mark-to-market through net income.

Expenses

Our expenses consist largely of net losses and loss expenses, acquisition costs and general and administrative expenses. Net losses and loss expenses incurred are comprised of three main components:

•

losses paid, which are actual cash payments to insureds and reinsureds, net of recoveries from reinsurers;

•

outstanding loss or case reserves, which represent management’s best estimate of the likely settlement amount for known claims, less the portion that can be recovered from reinsurers; and

•

reserves for losses incurred but not reported, or “IBNR”, which are reserves (in addition to case reserves) established by us that we believe are needed for the future settlement of claims. The portion recoverable from reinsurers is deducted from the gross estimated loss.

General and administrative expenses include personnel expenses including stock-based compensation expense, rent expense, professional fees, information technology costs and other general operating expenses.

Ratios

Management measures results for each segment on the basis of the “loss and loss expense ratio,” “acquisition cost ratio,” “general and administrative expense ratio,” “expense ratio” and the “combined ratio.” Because we do not manage our assets by segment, investment income, interest expense and total assets are not allocated to individual reportable segments. General and administrative expenses are allocated to segments based on various factors, including staff count and each segment’s proportional share of gross premiums written.

Critical Accounting Policies

It is important to understand our accounting policies in order to understand our financial position and results of operations. Our consolidated financial statements reflect determinations that are inherently subjective in nature and require management to make assumptions and best estimates to determine the reported values. If events or other factors cause actual results to differ materially from management’s underlying assumptions or estimates, there could be a material adverse effect on our financial condition or results of operations. The following are the

accounting estimates that, in management’s judgment, are critical due to the judgments, assumptions and uncertainties underlying the application of those estimates and the potential for results to differ from management’s assumptions.

Reserve for Losses and Loss Expenses

Reserves for losses and loss expenses by segment as of December 31, 2012 and 2011 were comprised of the following:


	U.S. Insurance						International Insurance						Reinsurance						Total
	December 31,						December 31,						December 31,						December 31,
	2012			2011			2012			2011			2012			2011			2012			2011
	($ in millions)
Case reserves	$	508.8		$	387.6		$	550.5		$	522.6		$	479.8		$	456.2		$	1,539.1		$	1,366.4
IBNR		1,389.5			1,274.8			1,716.1			1,726.4			1,000.8			857.5			4,106.4			3,858.7

Reserve for losses and loss expenses		1,898.3			1,662.4			2,266.6			2,249.0			1,480.6			1,313.7			5,645.5			5,225.1
Reinsurance recoverables		(517.3	)		(438.3	)		(620.6	)		(564.3	)		(3.2	)		(0.3	)		(1,141.1	)		(1,002.9	)

Net reserve for losses and loss expenses	$	1,381.0		$	1,224.1		$	1,646.0		$	1,684.7		$	1,477.4		$	1,313.4		$	4,504.4		$	4,222.2

The reserve for losses and loss expenses is comprised of two main elements: outstanding loss reserves, also known as case reserves, and reserves for IBNR. Outstanding loss reserves relate to known claims and represent management’s best estimate of the likely loss settlement. IBNR reserves relate primarily to unreported events that, based on industry information, management’s experience and actuarial evaluation, can reasonably be expected to have occurred and are reasonably likely to result in a loss to our company. IBNR reserves also relate to estimated development of reported events that based on industry information, management’s experience and actuarial evaluation, can reasonably be expected to reach our attachment point and are reasonably likely to result in a loss to our company. We also include IBNR changes in the values of claims that have been reported to us but are not yet settled. Each claim is settled individually based upon its merits and it is not unusual for a claim to take years after being reported to settle, especially if legal action is involved. As a result, reserves for losses and loss expenses include significant estimates for IBNR reserves.

The reserve for IBNR is estimated by management for each line of business based on various factors, including underwriters’ expectations about loss experience, actuarial analysis, comparisons with the results of industry benchmarks and loss experience to date. The reserve for IBNR is calculated as the ultimate amount of losses and loss expenses less cumulative paid losses and loss expenses and case reserves. Our actuaries employ generally accepted actuarial methodologies to determine estimated ultimate loss reserves.

While management believes that our case reserves and IBNR are sufficient to cover losses assumed by us, there can be no assurance that losses will not deviate from our reserves, possibly by material amounts. The methodology of estimating loss reserves is periodically reviewed to ensure that the assumptions made continue to be appropriate. To the extent actual reported losses exceed estimated losses, the carried estimate of the ultimate losses will be increased (i.e., unfavorable reserve development), and to the extent actual reported losses are less than estimated losses, the carried estimate of ultimate losses will be reduced (i.e., favorable reserve development). We record any changes in our loss reserve estimates and the related reinsurance recoverables in the periods in which they are determined.

In certain lines of business, claims are generally reported and paid within a relatively short period of time (“shorter tail lines”) during and following the policy coverage period. This generally enables us to determine with greater certainty our estimate of ultimate losses and loss expenses. The estimate of reserves for our shorter tail lines of business and products, including property, crop, aviation, marine, personal accident and workers compensation catastrophe relies primarily on traditional loss reserving methodologies, utilizing selected paid and reported loss development factors.

Our casualty insurance and casualty reinsurance lines of business include general liability risks, healthcare and professional liability risks. Claims may be reported or settled several years after the coverage period has terminated for these lines of business (“longer tail lines”), which increases uncertainties of our reserve estimates in such lines. In addition, our attachment points for these longer tail lines are often relatively high, making reserving for these lines of business more difficult than shorter tail lines due to having to estimate whether the

severity of the estimated losses will exceed our attachment point. We establish a case reserve when sufficient information is gathered to make a reasonable estimate of the liability, which often requires a significant amount of information and time. Due to the lengthy reporting pattern of these casualty lines, reliance is placed on industry benchmarks supplemented by our own experience. For expected loss ratio selections, we are giving increasing consideration to our existing experience supplemented with analysis of loss trends, rate changes and experience of peer companies.

Our reinsurance treaties are reviewed individually, based upon individual characteristics and loss experience emergence. Loss reserves on assumed reinsurance have unique features that make them more difficult to estimate than direct insurance. We establish loss reserves upon receipt of advice from a cedent that a reserve is merited. Our claims staff may establish additional loss reserves where, in their judgment, the amount reported by a cedent is potentially inadequate. The following are the most significant features that make estimating loss reserves on assumed reinsurance difficult:

•

Reinsurers have to rely upon the cedents and reinsurance intermediaries to report losses in a timely fashion.

•

Reinsurers must rely upon cedents to price the underlying business appropriately.

•

Reinsurers have less predictable loss emergence patterns than direct insurers, particularly when writing excess-of-loss reinsurance.

For excess-of-loss reinsurance, cedents generally are required to report losses that either exceed 50% of the retention, have a reasonable probability of exceeding the retention or meet serious injury reporting criteria. All reinsurance claims that are reserved are reviewed at least every six months. For quota share reinsurance treaties, cedents are required to give a periodic statement of account, generally monthly or quarterly. These periodic statements typically include information regarding written premiums, earned premiums, unearned premiums, ceding commissions, brokerage amounts, applicable taxes, paid losses and outstanding losses. They can be submitted 60 to 90 days after the close of the reporting period. Some quota share reinsurance treaties have specific language regarding earlier notice of serious claims.

Reinsurance generally has a greater time lag than direct insurance in the reporting of claims. The time lag is caused by the claim first being reported to the cedent, then the intermediary (such as a broker) and finally the reinsurer. This lag can be up to six months or longer in certain cases. There is also a time lag because the insurer may not be required to report claims to the reinsurer until certain reporting criteria are met. In some instances this could be several years while a claim is being litigated. We use reporting factors based on data from the Reinsurance Association of America to adjust for time lags. We also use historical treaty-specific reporting factors when applicable. Loss and premium information are entered into our reinsurance system by our claims department and our accounting department on a timely basis.

We record the individual case reserves sent to us by the cedents through the reinsurance intermediaries. Individual claims are reviewed by our reinsurance claims department and adjusted as deemed appropriate. The loss data received from the intermediaries is checked for reasonableness and for known events. Details of the loss listings are reviewed during routine claim audits.

The expected loss ratios that we assign to each treaty are based upon analysis and modeling performed by a team of actuaries. The historical data reviewed by the team of pricing actuaries is considered in setting the reserves for each cedent. The historical data in the submissions is matched against our carried reserves for our historical treaty years.

Loss reserves do not represent an exact calculation of liability. Rather, loss reserves are estimates of what we expect the ultimate resolution and administration of claims will cost. These estimates are based on actuarial and statistical projections and on our assessment of currently available data, as well as estimates of future trends in claims severity and frequency, judicial theories of liability and other factors. Loss reserve estimates are refined

as experience develops and as claims are reported and resolved. In addition, the relatively long periods between when a loss occurs and when it may be reported to our claims department for our casualty insurance and casualty reinsurance lines of business increase the uncertainties of our reserve estimates in such lines.

We utilize a variety of standard actuarial methods in our analysis. The selections from these various methods are based on the loss development characteristics of the specific line of business. For lines of business with long reporting periods such as casualty reinsurance, we may rely more on an expected loss ratio method (as described below) until losses begin to develop. For lines of business with short reporting periods such as property insurance, we may rely more on a paid loss development method (as described below) as losses are reported relatively quickly. The actuarial methods we utilize include:

Paid Loss Development Method. We estimate ultimate losses by calculating past paid loss development factors and applying them to exposure periods with further expected paid loss development. The paid loss development method assumes that losses are paid at a consistent rate. The paid loss development method provides an objective test of reported loss projections because paid losses contain no reserve estimates. In some circumstances, paid losses for recent periods may be too varied for accurate predictions. For many coverages, especially casualty coverages, claim payments are made slowly and it may take years for claims to be fully reported and settled. These payments may be unreliable for determining future loss projections because of shifts in settlement patterns or because of large settlements in the early stages of development. Choosing an appropriate “tail factor” to determine the amount of payments from the latest development period to the ultimate development period may also require considerable judgment, especially for coverages that have long payment patterns. As we have limited payment history, we have had to supplement our paid loss development patterns with appropriate benchmarks.

Reported Loss Development Method. We estimate ultimate losses by calculating past reported loss development factors and applying them to exposure periods with further expected reported loss development. Since reported losses include payments and case reserves, changes in both of these amounts are incorporated in this method. This approach provides a larger volume of data to estimate ultimate losses than the paid loss development method. Thus, reported loss patterns may be less varied than paid loss patterns, especially for coverages that have historically been paid out over a long period of time but for which claims are reported relatively early and have case loss reserve estimates established. This method assumes that reserves have been established using consistent practices over the historical period that is reviewed. Changes in claims handling procedures, large claims or significant numbers of claims of an unusual nature may cause results to be too varied for accurate forecasting. Also, choosing an appropriate “tail factor” to determine the change in reported loss from the latest development period to the ultimate development period may require considerable judgment. As we have limited reported history, we have had to supplement our reported loss development patterns with appropriate benchmarks.

Expected Loss Ratio Method. To estimate ultimate losses under the expected loss ratio method, we multiply earned premiums by an expected loss ratio. The expected loss ratio is selected utilizing industry data, historical company data and professional judgment. This method is particularly useful for new lines of business where there are no historical losses or where past loss experience is not credible.

Bornhuetter-Ferguson Paid Loss Method. The Bornhuetter-Ferguson paid loss method is a combination of the paid loss development method and the expected loss ratio method. The amount of losses yet to be paid is based upon the expected loss ratios and the expected percentage of losses unpaid. These expected loss ratios are modified to the extent paid losses to date differ from what would have been expected to have been paid based upon the selected paid loss development pattern. This method avoids some of the distortions that could result from a large development factor being applied to a small base of paid losses to calculate ultimate losses. This method will react slowly if actual loss ratios develop differently because of major changes in rate levels, retentions or deductibles, the forms and conditions of reinsurance coverage, the types of risks covered or a variety of other changes.

Bornhuetter-Ferguson Reported Loss Method. The Bornhuetter-Ferguson reported loss method is similar to the Bornhuetter-Ferguson paid loss method with the exception that it uses reported losses and reported loss development factors.

During 2012, 2011 and 2010, we adjusted our reliance on actuarial methods utilized for certain casualty lines of business and loss years within our U.S. insurance and international insurance segments from using a blend of the Bornhuetter-Ferguson reported loss method and the expected loss ratio method to using only the Bornhuetter-Ferguson reported loss method. We also began adjusting our reliance on actuarial methods utilized for certain other casualty lines of business and loss years within all of our operating segments including the reinsurance segment, by placing greater reliance on the Bornhuetter-Ferguson reported loss method than on the expected loss ratio method. Placing greater reliance on more responsive actuarial methods for certain casualty lines of business and loss years within each of our operating segments is a natural progression as we mature as a company and gain sufficient historical experience of our own that allows us to further refine our estimate of the reserve for losses and loss expenses. We believe utilizing only the Bornhuetter-Ferguson reported loss method for older loss years will more accurately reflect the reported loss activity we have had thus far in our ultimate loss ratio selections, and will better reflect how the ultimate losses will develop over time. We will continue to utilize the expected loss ratio method for the most recent loss years until we have sufficient experience to utilize other acceptable actuarial methodologies.

We expect that the trend of placing greater reliance on more responsive actuarial methods, for example from the expected loss ratio method to the Bornhuetter-Ferguson reported loss method, to continue as both (1) our loss years mature and become more statistically reliable and (2) as we build databases of our internal loss development patterns. The expected loss ratio remains a key assumption as the Bornhuetter-Ferguson methods rely upon an expected loss ratio selection and a loss development pattern selection.

The key assumptions used to arrive at our best estimate of loss reserves are the expected loss ratios, rate of loss cost inflation, selection of benchmarks and reported and paid loss emergence patterns. Our reporting factors and expected loss ratios are based on a blend of our own experience and industry benchmarks for longer tailed business and primarily our own experience for shorter tail business. The benchmarks selected were those that we believe are most similar to our underwriting business.

Our expected loss ratios for shorter tail lines change from year to year. As our losses from shorter tail lines of business are reported relatively quickly, we select our expected loss ratios for the most recent years based upon our actual loss ratios for our older years adjusted for rate changes, inflation, cost of reinsurance and average storm activity. For the shorter tail lines, we initially used benchmarks for reported and paid loss emergence patterns. As we mature as a company, we have begun supplementing those benchmark patterns with our actual patterns as appropriate. For the longer tail lines, we continue to use benchmark patterns, although we update the benchmark patterns as additional information is published regarding the benchmark data.

For shorter tail lines, the primary assumption that changed during both 2012 as compared to 2011 and 2011 as compared to 2010 as it relates to prior year losses was actual paid and reported loss emergence patterns were generally less severe than estimated for each year due to lower frequency and severity of reported losses. As a result of this change, we recognized net favorable prior year reserve development in both 2012 and 2011. However, we did experience significant losses on certain of our shorter tail lines related to the current loss year.

During the years ended December 31, 2012, 2011 and 2010, we incurred $179.6 million, $292.2 million and $98.3 million of catastrophe-related losses. In addition, during the year ended December 31, 2012 we recognized $36.0 million related to drought losses on the U.S. Crop reinsurance book.

We will continue to evaluate and monitor the development of these losses and the impact it has on our current and future assumptions. We believe recognition of the reserve changes in the period they were recorded was appropriate since a pattern of reported losses had not emerged and the loss years were previously too immature to deviate from the expected loss ratio method in prior periods.

The selection of the expected loss ratios for the longer tail lines is our most significant assumption. Due to the lengthy reporting pattern of longer tail lines, we supplement our own experience with industry benchmarks of expected loss ratios and reporting patterns in addition to our own experience. For our longer tail lines, the primary assumption that changed during both 2012 as compared to 2011 and 2011 as compared to 2010 as it

relates to prior year losses was using the Bornhuetter-Ferguson loss development method for certain casualty lines of business and loss years as discussed above. This method calculated a lower projected loss ratio based on loss emergence patterns to date. As a result of the change in the expected loss ratio, we recognized net favorable prior year reserve development in 2012, 2011 and 2010. We believe that recognition of the reserve changes in the period they were recorded was appropriate since a pattern of reported losses had not emerged and the loss years were previously too immature to deviate from the expected loss ratio method in prior periods.

Our overall change in the loss reserve estimates related to prior years decreased as a percentage of total carried reserves during 2012. During 2012 we had a net decrease of $170.3 million, or 4.0%, on an opening carried reserve base of $4,222.2 million, net of reinsurance recoverable. During 2011 we had a net decrease of $253.5 million, or 6.4%, on an opening carried reserve base of $3,951.6 million, net of reinsurance recoverables. We believe that these changes are reasonable given the long-tail nature of our business.

There is potential for significant variation in the development of loss reserves, particularly for the casualty lines of business due to their long tail nature and high attachment points. The maturing of our casualty insurance and reinsurance loss reserves have caused us to reduce what we believe is the reasonably possible variance in the expected loss ratios for older loss years. As of December 31, 2012 and 2011, we believe the reasonably possible variances in our expected loss ratio in percentage points for our loss years are as follows:


	As of December 31,
Loss Year	2012			2011
2004		0.0	%		2.0	%
2005		2.0	%		4.0	%
2006		4.0	%		6.0	%
2007		6.0	%		8.0	%
2008		8.0	%		10.0	%
2009		10.0	%		10.0	%
2010		10.0	%		10.0	%
2011		10.0	%		10.0	%
2012		10.0	%		N/A

The change in the reasonably possible variance for the 2005 through 2008 loss years in 2012 compared to 2011 is due to giving greater weight to the Bornhuetter-Ferguson loss development method for additional lines of business during 2011 and additional development of losses. The total reasonably possible variance of our expected loss ratio for all loss years for our casualty insurance and casualty reinsurance lines of business was six percentage points as of December 31, 2012. Because we expect a small volume of large claims, it is more difficult to estimate the ultimate loss ratios, so we believe the variance of our loss ratio selection could be relatively wide.

If our final casualty insurance and reinsurance loss ratios vary by six percentage points from the expected loss ratios in aggregate, our required net reserves after reinsurance recoverable would increase or decrease by approximately $610.6 million. Excluding the impact of income taxes, this would result in either an increase or decrease to net income and total shareholders’ equity of approximately $610.6 million. As of December 31, 2012, this represented approximately 18% of total shareholders’ equity.

In terms of liquidity, our contractual obligations for reserves for losses and loss expenses would also increase or decrease by approximately $610.6 million after reinsurance recoverable. If our obligations were to increase, we believe we currently have sufficient cash and investments to meet those obligations.

The following tables provide our ranges of loss and loss expense reserve estimates by business segment as of December 31, 2012:


	Reserve for Losses and Loss Expenses Gross of Reinsurance Recoverable
	Carried Reserves		Low Estimate		High Estimate
	($ in millions)
U.S. insurance	$	1,898.3	$	1,450.8	$	2,154.2
International insurance		2,266.6		1,736.6		2,559.2
Reinsurance		1,480.6		1,164.0		1,714.1
Consolidated(1)		5,645.5		4,472.2		6,306.6

	Reserve for Losses and Loss Expenses Net of Reinsurance Recoverable
	Carried Reserves		Low Estimate		High Estimate
	($ in millions)
U.S. insurance	$	1,380.9	$	1,062.7	$	1,576.9
International insurance		1,646.1		1,247.1		1,865.5
Reinsurance		1,477.4		1,161.0		1,710.7
Consolidated(1)		4,504.4		3,574.0		5,049.9

(1)	For statistical reasons, it is not appropriate to add together the ranges of each business segment in an effort to determine the low and high range around the consolidated loss reserves.

Our range for each business segment was determined by utilizing multiple actuarial loss reserving methods along with various assumptions of reporting patterns and expected loss ratios by loss year. The various outcomes of these techniques were combined to determine a reasonable range of required loss and loss expense reserves. While we believe our approach to determine the range of loss and loss expense is reasonable, there are no assurances that actual loss experience will be within the ranges of loss and loss expense noted above.

Our selection of the actual carried reserves has typically been above the midpoint of the range. As of December 31, 2012, we were 4.5% above the midpoint of the consolidated net loss reserve range. We believe that we should be prudent in our reserving practices due to the lengthy reporting patterns and relatively large limits of net liability for any one risk of our direct excess casualty business and of our casualty reinsurance business. Thus, due to this uncertainty regarding estimates for reserve for losses and loss expenses, we have carried our consolidated reserve for losses and loss expenses, net of reinsurance recoverable, above the midpoint of the low and high estimates for the consolidated net losses and loss expenses. We believe that relying on the more prudent actuarial indications is appropriate for these lines of business.

Ceded Reinsurance

We cede insurance to reinsurers in order to limit our maximum loss, to protect against concentration of risk within our portfolio and to manage our exposure to catastrophic events. Because the ceding of insurance does not discharge us from our primary obligation to the insureds, we remain liable to the extent that our reinsurers do not meet their obligations under the reinsurance agreements. Therefore, we regularly evaluate the financial condition of our reinsurers and monitor concentration of credit risk. No material provision has been made for unrecoverable reinsurance as of December 31, 2012 and 2011 as we believe that all reinsurance balances will be recovered.

When we reinsure a portion of our exposures, we pay reinsurers a portion of premiums received on the reinsured policies. The following table illustrates our gross premiums written, ceded premiums written and net premiums written:


	Year Ended December 31,
	2012			2011			2010
	($ in millions)
Gross premiums written	$	2,329.3		$	1,939.5		$	1,758.4
Premiums ceded		(491.5	)		(405.7	)		(365.9	)

Net premiums written	$	1,837.8		$	1,533.8		$	1,392.5

Ceded as a percentage of gross		21.1	%		20.9	%		20.8	%

The following table illustrates the effect of our reinsurance ceded strategies on our results of operations:


	Year Ended December 31,
	2012			2011			2010
	($ in millions)
Ceded premiums written	$	491.5		$	405.8		$	365.9

Ceded premiums earned	$	440.8		$	366.3		$	365.3
Losses and loss expenses ceded		(252.6	)		(214.6	)		(165.8	)
Acquisition costs ceded		(97.3	)		(92.6	)		(81.5	)

We had net cash outflows relating to ceded reinsurance activities (premiums paid less losses recovered and net ceding commissions received) of approximately $247.5 million, $148.3 million and $128.5 million for the years ended December 31, 2012, 2011 and 2010, respectively. The net cash outflows in all years are reflective of fewer losses that were recoverable under our reinsurance coverages.

Our reinsurance treaties are generally purchased on an annual basis and are therefore subject to yearly renegotiation. The treaties typically specify ceding commissions, and include provisions for required reporting to the reinsurers, responsibility for taxes, arbitration of disputes and the posting of security for the reinsurance recoverable under certain circumstances, such as a downgrade in the reinsurer’s financial strength rating. The amount of risk ceded by us to reinsurers is subject to maximum limits which vary by line of business and by type of coverage. We also purchase a limited amount of facultative reinsurance, which provides cover for specified policies, rather than for whole classes of business.

The examples below illustrate the types of treaty reinsurance arrangements in force at December 31, 2012:

•

General Property: We purchased both quota share reinsurance for our general property business written in our U.S. insurance and international insurance segments, as well as excess-of-loss cover providing protection for specified classes of catastrophe. We have also purchased a limited amount of facultative reinsurance, which provides cover for specified general property policies.

•

General Casualty: We have purchased variable quota share reinsurance for our general casualty business since December 2002. At year-end 2012, the percentage ceded varied by both location of writing office and by limits reinsured, with a significantly larger cession being effective for policies above $25 million in limits. We also have excess-of-loss cover in place for general casualty business written in our Asian branch offices.

•

Professional Liability: For professional liability policies, our reinsurance varied by writing office and by policy type. Professional liability policies written in our Bermuda, European and U.S. offices were quota-share reinsured with cession percentages dependent upon location. Additionally, the professional liability policies written in the United States were reinsured on an excess-of-loss basis.

•

Healthcare: We purchased quota share and excess-of-loss reinsurance protection for our healthcare line of business written by our Bermuda and U.S. offices, respectively. As is the case with general casualty, our healthcare business originating in Asia is under an excess-of-loss reinsurance arrangement.

The following table illustrates our reinsurance recoverable as of December 31, 2012 and 2011:


	As of December 31,
	2012		2011
	($ in millions)
Ceded case reserves	$	234.2	$	196.5
Ceded IBNR reserves		906.9		806.4

Reinsurance recoverable	$	1,141.1	$	1,002.9

As noted above, we remain obligated for amounts ceded in the event our reinsurers do not meet their obligations. Accordingly, we have evaluated the reinsurers that are providing reinsurance protection to us and will continue to monitor their credit ratings and financial stability. We generally have the right to terminate our treaty reinsurance contracts at any time, upon prior written notice to the reinsurer, under specified circumstances, including the assignment to the reinsurer by A.M. Best of a financial strength rating of less than “A-.”

As of December 31, 2012, approximately 99% of ceded case reserves and ceded IBNR were recoverable from reinsurers who had an A.M. Best rating of “A-” or higher. The following table shows a breakdown of our reinsurance recoverables by credit rating as of December 31, 2012:


	As of December 31, 2012
A.M Best Rating:	Ceded OSLR		Ceded IBNR		Reinsurance Recoverable		Reinsurance Recoverable on Paid
	($ in millions)
A++	$	38.0	$	40.1	$	78.1	$	—
A+		83.2		356.8		440.0		33.6
A		110.1		502.6		612.7		22.0
A-		—		0.7		0.7		0.9
B++		0.7		4.5		5.2		0.3
NR		2.2		2.2		4.4		0.1

Total	$	234.2	$	906.9	$	1,141.1	$	56.9

We determine what portion of the losses will be recoverable under our reinsurance policies by reference to the terms of the reinsurance protection purchased. This determination is necessarily based on the underlying loss estimates and, accordingly, is subject to the same uncertainties as the estimate of case reserves and IBNR reserves.

The following table shows our reinsurance recoverables by operating segment as of December 31, 2012 and 2011:


	As of December 31,
	2012		2011
	($ in millions)
U.S. insurance	$	517.3	$	438.3
International insurance		620.6		564.3
Reinsurance		3.2		0.3

Total	$	1,141.1	$	1,002.9

Historically, our reinsurance recoverables related primarily to our property lines of business, which being short tail in nature, are not subject to the same variations as our casualty lines of business. However, during 2012 and 2011 we have increased the amount of reinsurance we utilize for our casualty lines of business in the U.S. insurance and international insurance segments; and as such, the reinsurance recoverables from our casualty lines of business have increased over the past several years.

Our reinsurance recoverables are subject to the same uncertainties as the estimate of case reserves and IBNR reserves. The reasonably possible variance of our expected ceded loss ratio for all loss years for our casualty insurance and casualty reinsurance lines of business was eight percentage points as of December 31, 2012.

If our final casualty insurance ceded loss ratios vary by eight percentage points from the expected loss ratios in aggregate, our required reinsurance recoverable would increase or decrease by approximately $152.2 million. Excluding the impact of income taxes, this would result in either an increase or decrease to net income and shareholders’ equity of approximately $152.2 million. As of December 31, 2012, this amount represented approximately 5% of total shareholders’ equity.

Premiums and Acquisition Costs

Premiums are recognized as written on the inception date of a policy. For certain types of business written by us, notably reinsurance, premium income may not be known at the contract inception date. In the case of quota share reinsurance assumed by us, the underwriter makes an estimate of premium income at inception as the premium income is typically derived as a percentage of the underlying policies written by the cedents. The underwriter’s estimate is based on statistical data provided by reinsureds and the underwriter’s judgment and experience. Such estimations are refined over the reporting period of each treaty as actual written premium information is reported by ceding companies and intermediaries. Management reviews estimated premiums at least quarterly and any adjustments are recorded in the period in which they become known.

As of December 31, 2012, our changes in quota share premium estimates have been adjustments of 10%, 0% and (7)% for the 2011, 2010 and 2009 treaty years, respectively. For the 2012 treaty year, a 5% change in our premium estimate would cause gross premiums written in our reinsurance segment to increase or decrease by $13.8 million over the next three years. There would also be a related increase or decrease in loss and loss expenses and acquisition costs due to the increase or decrease in gross premiums written.

Total premiums estimated on quota share reinsurance contracts for the years ended December 31, 2012, 2011 and 2010 represented approximately 13%, 11% and 13%, respectively, of total gross premiums written.

Other insurance and reinsurance policies can require that the premium be adjusted at the expiry of a policy to reflect the risk assumed by us. Premiums resulting from such adjustments are estimated and accrued based on available information.

Fair Value of Financial Instruments

In accordance with U.S. GAAP, we are required to recognize certain assets at their fair value in our consolidated balance sheets. This includes our fixed maturity investments and other invested assets. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. There is a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon whether the inputs to the valuation of an asset or liability are observable or unobservable in the market at the measurement date, with quoted market prices being the highest level (Level 1) and unobservable inputs being the lowest level (Level 3). A fair value measurement will fall within the level of the hierarchy based on the input that is significant to determining such measurement. The three levels are defined as follows:

•

Level 1: Observable inputs to the valuation methodology that are quoted prices (unadjusted) for identical assets or liabilities in active markets.

•

Level 2: Observable inputs to the valuation methodology other than quoted market prices (unadjusted) for identical assets or liabilities in active markets. Level 2 inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical assets in markets that are not active and inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability.

•

Level 3: Inputs to the valuation methodology which are unobservable for the asset or liability.

At each measurement date, we estimate the fair value of the financial instruments using various valuation techniques. We utilize, to the extent available, quoted market prices in active markets or observable market inputs in estimating the fair value of our financial instruments. When quoted market prices or observable market inputs are not available, we utilize valuation techniques that rely on unobservable inputs to estimate the fair value of financial instruments. The following describes the valuation techniques we used to determine the fair value of financial instruments held as of December 31, 2012 and what level within the U.S. GAAP fair value hierarchy the valuation technique resides.

U.S. government and U.S. government agencies: Comprised primarily of bonds issued by the U.S. Treasury, the Federal Home Loan Bank, the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association. The fair values of U.S. government securities are based on quoted market prices in active markets, and are included in the Level 1 fair value hierarchy. We believe the market for U.S. Treasury securities is an actively traded market given the high level of daily trading volume. The fair values of U.S. government agency securities are priced using the spread above the risk-free yield curve. As the yields for the risk-free yield curve and the spreads for these securities are observable market inputs, the fair values of U.S. government agency securities are included in the Level 2 fair value hierarchy.

Non-U.S. government and government agencies: Comprised of fixed income obligations of non-U.S. governmental entities. The fair values of these securities are based on prices obtained from international indices and are included in the Level 2 fair value hierarchy.

States, municipalities and political subdivisions: Comprised of fixed income obligations of U.S. domiciled state and municipality entities. The fair values of these securities are based on prices obtained from the new issue market, and are included in the Level 2 fair value hierarchy.

Corporate debt: Comprised of bonds issued by corporations that are diversified across a wide range of issuers and industries. The fair values of corporate bonds that pay a floating rate coupon are priced using the spread above the London Interbank Offered Rate yield curve and the fair values of corporate bonds that are long term are priced using the spread above the risk-free yield curve. The spreads are sourced from broker-dealers, trade prices and the new issue market. As the significant inputs used to price corporate bonds are observable market inputs, the fair values of corporate bonds are included in the Level 2 fair value hierarchy.

Mortgage-backed: Principally comprised of residential and commercial mortgages originated by both U.S. government agencies (such as the Federal National Mortgage Association) and non-U.S. government agency originators. The fair values of mortgage-backed securities originated by U.S. government agencies and non-U.S. government agencies are based on a pricing model that incorporates prepayment speeds and spreads to determine the appropriate average life of mortgage-backed securities. The spreads are sourced from broker-dealers, trade prices and the new issue market. As the significant inputs used to price the mortgage-backed securities are observable market inputs, the fair values of these securities are included in the Level 2 fair value hierarchy, unless the significant inputs used to price the mortgage-backed securities are broker-dealer quotes and we are not able to determine if those quotes are based on observable market inputs, in which case the fair value is included in the Level 3 fair value hierarchy.

Asset-backed: Principally comprised of bonds backed by pools of automobile loan receivables, home equity loans, credit card receivables and collateralized loan obligations originated by a variety of financial institutions. The fair values of asset-backed securities are priced using prepayment speed and spread inputs that are sourced from the new issue market or broker-dealer quotes. As the significant inputs used to price the asset-backed securities are observable market inputs, the fair values of these securities are included in the Level 2 fair value hierarchy, unless the significant inputs used to price the asset-backed securities are broker-dealer quotes and we are not able to determine if those quotes are based on observable market inputs, in which case the fair value is included in the Level 3 fair value hierarchy.

Equity securities: Comprised of U.S. and foreign common and preferred stocks and mutual funds. Equities are generally included in the Level 1 fair value hierarchy as prices are obtained from market exchanges in active markets. Foreign mutual funds where the net asset value is not provided on a daily basis are included in the Level 3 fair value hierarchy.

Other invested assets: Comprised of funds invested in a range of diversified strategies. In accordance with U.S. GAAP, the fair values of the funds are based on the net asset value of the funds as reported by the fund manager that the Company believes is an unobservable input, and as such, the fair values of those funds are included in the Level 3 fair value hierarchy. The Company does not measure its investments that are accounted for using the equity method of accounting at fair value.

Derivative instruments: The fair value of foreign exchange contracts and interest rate futures are priced from quoted market prices for similar exchange-traded derivatives and pricing valuation models that utilize independent market data inputs. The fair value of derivatives are included in the Level 2 fair value hierarchy.

Senior notes: The fair value of the senior notes is based on trades as reported in Bloomberg. The fair value of the senior notes is included in the Level 2 fair value hierarchy.

The following table shows the pricing sources of our fixed maturity investments held as of December 31, 2012 and 2011:


	As of December 31, 2012							As of December 31, 2011
	Fair Value		Percentage of Total			Fair Value Hierarchy Level		Fair Value		Percentage of Total			Fair Value Hierarchy Level
	($ in millions)							($ in millions)
Barclays indices	$	4,001.6		60.4	%		1 and 2	$	4,044.1		62.2	%		1 and 2
Reuters pricing service		821.5		12.4	%		2		458.8		7.1	%		2
Interactive Data Pricing		622.6		9.4	%		2		996.5		15.3	%		2
Merrill Lynch indices		272.5		4.1	%		2		160.0		2.5	%		2
Broker-dealer quotes		230.1		3.5	%		3		343.9		5.3	%		3
International indices		122.4		1.8	%		2		115.4		1.8	%		2
Other sources		555.8		8.4	%		2		380.0		5.8	%		2

	$	6,626.5		100.0	%			$	6,498.7		100.0	%

Barclays indices: We use Barclays indices to price our U.S. government, U.S. government agencies, corporate debt, agency and non-agency mortgage-backed and asset-backed securities. There are several observable inputs that the Barclays indices use in determining its prices which include among others, treasury yields, new issuance and secondary trades, information provided by broker-dealers, security cash flows and structures, sector and issuer level spreads, credit rating, underlying collateral and prepayment speeds. For U.S. government securities, traders that act as market makers are the primary source of pricing; as such, for U.S. government securities we believe the Barclays indices reflect quoted prices (unadjusted) for identical securities in active markets.

Interactive Data Pricing: We use Interactive Data Pricing to price our U.S. government agencies, municipalities, non-agency mortgage-backed and asset-backed securities. There are several observable inputs that Interactive Data Pricing uses in determining its prices which include among others, benchmark yields, reported trades and issuer spreads.

Reuters pricing service: We use the Reuters pricing service to price our U.S. government agencies, corporate debt, agency and non-agency mortgage-backed and asset-backed securities. There are several observable inputs that the Reuters pricing service uses in determining its prices which include among others, option-adjusted spreads, treasury yields, new issuance and secondary trades, sector and issuer level spreads, underlying collateral and prepayment speeds.

Broker-dealer quotes: We also utilize broker-dealers to price our agency and non-agency mortgage-backed and asset-backed securities. The pricing sources include JP Morgan Securities Inc., Bank of America Securities LLC, Deutsche Bank Securities Inc. and other broker-dealers. When broker-dealer quotes are utilized it is primarily due to the fact that the particular broker-dealer was involved in the initial pricing of the security.

Merrill Lynch Index: We use the Merrill Lynch indices to price our non-U.S. government and government agencies securities, corporate debt, municipalities and asset-backed securities. There are several observable inputs that the Merrill Lynch indices use in determining its prices, which include reported trades and other sources.

Standard & Poor’s Securities Evaluation: We use Standard & Poor’s to price our U.S. government agencies, corporate debt, municipalities, mortgage-backed and asset-backed securities. There are several observable inputs that Standard & Poor’s uses in determining its prices which include among others, benchmark yields, reported trades and issuer spreads.

International indices: We use international indices, which include the FTSE, Deutsche Teleborse and the Scotia Index, to price our non-U.S. government and government agencies securities. The observable inputs used by international indices to determine its prices are based on new issuance and secondary trades and information provided by broker-dealers.

Other sources: We utilize other indices and pricing services to price various securities. These sources use observable inputs consistent with indices and pricing services discussed above.

We utilize independent pricing sources to obtain market quotations for securities that have quoted prices in active markets. In general, the independent pricing sources use observable market inputs, including, but not limited to, investment yields, credit risks and spreads, benchmarking of like securities, non-binding broker-dealer quotes, reported trades and sector groupings to determine the fair value. For a majority of the portfolio, we obtained two or more prices per security as of December 31, 2012. When multiple prices are obtained, a price source hierarchy is utilized to determine which price source is the best estimate of the fair value of the security. The price source hierarchy emphasizes more weighting to significant observable inputs such as index pricing and less weighting towards non-binding broker quotes. In addition, to validate all prices obtained from these pricing sources including non-binding broker quotes, we also obtain prices from our investment portfolio managers and other sources (e.g., another pricing vendor), and compare the prices obtained from the independent pricing sources to those obtained from our investment portfolio managers and other sources. We investigate any material differences between the multiple sources and determine which price best reflects the fair value of the individual security. There were no material differences between the prices from the independent pricing sources and the prices obtained from our investment portfolio managers and other sources as of December 31, 2012.

There have been no material changes to any of our valuation techniques from those used as of December 31, 2011. Based on all reasonably available information received, we believe the prices that were obtained from inactive markets were orderly transactions and therefore, reflected the current price a market participant would pay for the asset. Since fair valuing a financial instrument is an estimate of what a willing buyer would pay for our asset if we sold it, we will not know the ultimate value of our financial instruments until they are sold. We believe the valuation techniques utilized provide us with the best estimate of the price that would be received to sell our assets in an orderly transaction between participants at the measurement date.

Goodwill and Other Intangible Asset Impairment Valuation

We classify intangible assets into three categories: (1) intangible assets with finite lives subject to amortization; (2) intangible assets with indefinite lives not subject to amortization and (3) goodwill. Intangible assets, other than goodwill, consist of renewal rights, internally generated software, non-compete covenants and insurance licenses held by subsidiaries domiciled in the United States. The following is a summary of our goodwill and other intangible assets as of December 31, 2012 and 2011:


	Year		Finite or	Estimated Useful	Carrying Value As of December, 31,
Source of Goodwill or Intangible Asset	Acquired		Indefinite	Life	2012		2011
					($ in millions)
Goodwill(1)		2008	Indefinite	N/A	$	3.9	$	3.9
Goodwill(2)		2008	Indefinite	N/A		264.5		264.5

Total goodwill					$	268.4	$	268.4

Insurance licenses(3)		2002	Indefinite	N/A	$	3.9	$	3.9
Insurance licenses(1)		2008	Indefinite	N/A		12.0		12.0
Insurance licenses(2)		2008	Indefinite	N/A		8.0		8.0
Distribution network(2)		2008	Finite	15 years		27.5		30.0

Total intangible assets					$	51.4	$	53.9

(1)	Related to the acquisition of Finial Insurance Company

(2)	Related to the acquisition of Darwin

(3)	Related to the acquisition of Allied World National Assurance Company and Allied World Assurance Company (U.S.) Inc.

For intangible assets with finite lives, the value is amortized over their useful lives. We also test intangible assets with finite lives for impairment if conditions exist that indicate the carrying value may not be recoverable. Such factors include, but are not limited to:

•

A significant decrease in the market price of the intangible asset;

•

A significant adverse change in the extent or manner in which the intangible asset is being used or in its physical condition;

•

A significant adverse change in legal factors or in the business climate that could affect the value of the intangible asset, including an adverse action or assessment by a regulator;

•

An accumulation of costs significantly in excess of the amount originally expected for the acquisition or construction of the intangible asset;

•

A current-period operating or cash flow loss combined with a history of operating or cash flow losses or a projection or forecast that demonstrates continuing losses associated with the use of the intangible asset; and

•

A current expectation that, more likely than not, the intangible asset will be sold or otherwise disposed of significantly before the end of its previously estimated useful life.

As a result of our evaluation, we determined that there was no impairment to the carrying value of our intangible assets with finite lives for the year ended December 31, 2012.

For indefinite lived intangible assets we do not amortize the intangible asset but test these intangible assets for impairment by comparing the fair value of the assets to their carrying values on an annual basis or more frequently if circumstances warrant. The factors we consider to determine if an impairment exists are similar to factors noted above. As a result of our evaluation, we determined that there was no impairment to the carrying value of our indefinite lived intangible assets for the year ended December 31, 2012.

Goodwill represents the excess of the cost of acquisitions over the fair value of net assets acquired and is not amortized. Goodwill is assigned at acquisition to the applicable reporting unit(s) based on the expected benefit to be received by the reporting unit(s) from the business combination. We determine the expected benefit based on several factors including the purpose of the business combination, the strategy of the company subsequent to the business combination and structure of the acquired company subsequent to the business combination. A reporting unit is a component of our business that has discrete financial information which is reviewed by management. In determining the reporting unit, we analyze the inputs, processes, outputs and overall operating performance of the reporting unit.

We have determined that the goodwill arising from the acquisition of Darwin should be allocated to the U.S. insurance segment reporting unit as the assets employed and the liabilities relate to the U.S. insurance operations. All the insurance operations of Darwin are included into the U.S. insurance segment.

For goodwill, we perform an impairment test annually, or more frequently if circumstances warrant. We may first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. The results of the qualitative assessment will determine if an entity needs to proceed with the two-step goodwill impairment test.

The first step of the goodwill impairment test is to compare the fair value of the reporting unit with its carrying value, including goodwill. If the carrying amount of the reporting unit exceeds its fair value then the second step of the goodwill impairment test is performed. In determining the fair value of the reporting units discounted cash flow models and market multiple models are utilized. The discounted cash flow models apply a discount to projected cash flows including a terminal value calculation. The market multiple models apply earnings and book value multiples of similar publicly-traded companies to the reporting unit’s projected earnings or book value. We select the weighting of the models utilized to determine the fair value of the reporting units based on judgment, considering such factors as the reliability of the cash flow projections and the entities included in the market multiples.

The second step of the goodwill impairment test compares the implied fair value of the reporting unit’s goodwill with the carrying amount of that goodwill in order to determine the amount of impairment to be recognized. The implied fair value of goodwill is determined by deducting the fair value of a reporting unit’s identifiable assets and liabilities from the fair value of the reporting unit as a whole. The excess of the carrying value of goodwill above the implied goodwill, if any, would be recognized as an impairment charge in “amortization and impairment of intangible assets” in the consolidated income statements.

During 2012, we elected to bypass the qualitative assessment and performed the first step of the goodwill impairment testing on the goodwill.

While we believe that the U.S. insurance segment reporting unit is not at risk of failing step one of the goodwill impairment test, the process of determining whether or not an asset, such as goodwill, is impaired or recoverable relies on projections of future cash flows, operating results and market conditions. Such projections are inherently uncertain and, accordingly, actual future cash flows may differ materially from projected cash flows. In evaluating the recoverability of goodwill, we perform a discounted cash flow analysis. The discounted cash value may be different from the fair value that would result from an actual transaction between a willing buyer and a willing seller. Such analyses are particularly sensitive to changes in discount rates and investment rates. Changes to these rates might result in material changes in the valuation and determination of the recoverability of goodwill. For example, an increase in the rate used to discount cash flows will decrease the discounted cash value. There is likely to be a similar, but not necessarily as large as, increase in the investment rate used to project the cash flows resulting from investment income earned on our investments. Accordingly, an increase in the investment rate would increase the discounted cash value.

Based on our analysis, the point estimate fair value of the U.S. insurance segment reporting unit was in excess of its carrying value by approximately 30% as of the September 30, 2012 measurement date. As a result, we concluded there was no implied goodwill impairment, and therefore, no step two goodwill impairment testing was required.

Results of Operations

The following table sets forth our selected consolidated statement of operations data for each of the periods indicated.


	Year Ended December 31,
	2012			2011			2010
	($ in millions)
Revenues
Gross premiums written	$	2,329.3		$	1,939.5		$	1,758.4

Net premiums written	$	1,837.8		$	1,533.8		$	1,392.4

Net premiums earned	$	1,748.9		$	1,457.0		$	1,359.5
Net investment income		167.1			195.9			244.1
Net realized investment gains		306.4			10.1			285.6
Net impairment charges recognized in earnings		—			—			(0.2	)
Other income		—			101.7			0.9

	$	2,222.4		$	1,764.7		$	1,889.9


Expenses
Net losses and loss expenses	$	1,139.3		$	959.2		$	707.9
Acquisition costs		205.7			167.3			159.5
General and administrative expenses		307.3			271.6			286.5
Amortization of intangible assets		2.5			3.0			3.5
Interest expense		55.4			55.0			40.2
Foreign exchange loss		0.8			3.1			0.4

	$	1,711.0		$	1,459.2		$	1,198.0

Income before income taxes		511.4			305.5			691.9
Income tax expense		18.4			31.0			26.9

Net income	$	493.0		$	274.5		$	665.0


Ratios
Loss and loss expense ratio		65.1	%		65.8	%		52.1	%
Acquisition cost ratio		11.8	%		11.5	%		11.7	%
General and administrative expense ratio		17.6	%		18.6	%		21.1	%

Expense ratio		29.4	%		30.1	%		32.8	%

Combined ratio		94.5	%		95.9	%		84.9	%

Comparison of Years Ended December 31, 2012 and 2011

Premiums

Gross premiums written increased by $389.8 million, or 20.1%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The overall increase in gross premiums written was primarily the result of the following:

•

Gross premiums written in our U.S. insurance segment increased by $155.3 million, or 18.5%. The increase in gross premiums written was primarily due to increased new business across most lines, growth from new products introduced since 2010, and rate increases in all lines of business. This growth was partially offset by non-recurring business, the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions) and continued competition;

•

Gross premiums written in our international insurance segment increased by $44.7 million, or 8.4%, primarily as a result of increased premiums from new products and rate increases in select lines of business. This growth was partially offset by non-recurring business, the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions) and continued competition; and

•

Gross premiums written in our reinsurance segment increased by $189.8 million, or 33.3%. The increase in gross premiums written was primarily due to new business, both from new products and new regions, as well as increased participations on renewing business combined with rate increases in select regions and lines of business. This growth was partially offset by the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions) and continued competition.

The table below illustrates our gross premiums written by geographic location for each of the years indicated.


	Year Ended December 31,				Dollar		Percentage
	2012		2011		Change		Change
	($ in millions)
United States	$	1,360.2	$	1,080.1	$	280.1		25.9	%
Bermuda		611.4		565.8		45.6		8.1	%
Europe		228.8		210.4		18.4		8.7	%
Singapore		111.7		68.4		43.3		63.3	%
Hong Kong		17.2		14.8		2.4		16.2	%

	$	2,329.3	$	1,939.5	$	389.8		20.1	%

Net premiums written increased by $304.0 million, or 19.8%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The increase in net premiums written was due to the increase in gross premiums written. The difference between gross and net premiums written is the cost to us of purchasing reinsurance coverage, including the cost of property catastrophe reinsurance coverage. We ceded 21.1% of gross premiums written for the year ended December 31, 2012 compared to 20.9% in 2011.

Net premiums earned increased by $291.9 million, or 20.0%, for the year ended December 31, 2012 compared to the year ended December 31, 2011 consistent with the higher net premiums written in 2012.

We evaluate our business by segment, distinguishing between U.S. insurance, international insurance and reinsurance. The following table illustrates the mix of our business on both a gross premiums written and net premiums earned basis.


	Gross Premiums Written						Net Premiums Earned
	Year Ended December 31,						Year Ended December 31,
	2012			2011			2012			2011
U.S. insurance		42.7	%		43.2	%		38.4	%		40.1	%
International insurance		24.7	%		27.3	%		19.3	%		21.8	%
Reinsurance		32.6	%		29.5	%		42.3	%		38.1	%

Total		100.0	%		100.0	%		100.0	%		100.0	%

Net Investment Income

Net investment income decreased by $28.8 million, or 14.7%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The decrease was due to lower yields on our fixed maturity investments as well as an increased allocation to other invested assets, which contribute to our total return but carry little or no current yield. As of December 31, 2012, we held 8.9% of our total investments and cash equivalents in other invested assets compared to 6.7% as of December 31, 2011. The book yield of the investment portfolio for the years ended December 31, 2012 and 2011 was 2.1% and 2.5%, respectively.

The decrease in the book yield was due to the reinvestment of cash at lower rates and an increased allocation to lower risk asset classes combined with lower market yields. As of December 31, 2012, we held 21.2% of our total investments and cash equivalents in U.S. government or government agency securities, compared to 16.1% as of December 31, 2011. Cash and cash equivalents also increased to 9.8% of total investments and cash equivalents as compared to 8.8% as of December 31, 2011. Our average duration increased from 1.9 years as of December 31, 2011 to 2.1 years as of December 31, 2012.

Investment management expenses of $16.5 million and $14.2 million were incurred during the years ended December 31, 2012 and 2011, respectively. The increase in investment management expenses was primarily due to the increase in the size of our investment portfolio, as well as expenses from higher expense asset classes.

Realized Investment Gains

Net realized investment gains were comprised of the following:


	Year Ended December 31,
	2012			2011
	($ in millions)
Gross realized gains on sale of invested assets	$	183.6		$	154.9
Gross realized losses on sale of invested assets		(51.7	)		(62.1	)

Net realized gains on sale of invested assets		131.9			92.8
Net realized and unrealized losses on derivatives		(3.6	)		(70.1	)
Mark-to-market changes:
Debt securities, trading		106.3			(8.1	)
Other invested assets and equity securities		71.8			(4.5	)

Total mark-to-market changes		178.1			(12.6	)

Net realized investment gains	$	306.4		$	10.1

During the years ended December 31, 2012 and 2011, we did not recognize any net impairment charges. The total return of our investment portfolio was 5.5% and 2.0% for the years ended December 31, 2012 and 2011, respectively.

The investment portfolio return for the year ended December 31, 2012 benefited from the favorable financial, economic and business environment during the year and the absence of significant market events. Equity markets performed well, with the S&P 500 up over 13% during the year. Fixed income securities also benefited from the U.S. Federal Reserve’s continued quantitative easing, resulting in spreads tightening during the year.

The investment portfolio return for the year ended December 31, 2011 was negatively impacted by the credit downgrade of the U.S. Treasury and related securities in early August 2011 and the economic and political turmoil surrounding European sovereign and bank credit risk. The combination of these and other events caused investors to seek safe havens in specific sovereign risks, such as the U.S., Switzerland, Germany and Japan, while selling riskier asset classes, such as equities, corporate bonds and mortgage bonds, and driving down prices. As a result U.S. and European risk-free interest rates decreased and credit spreads widened. Equity markets were relatively flat over the full year of 2011, despite volatility during the year.

Other Income

There was no other income for the year ended December 31, 2012. The other income of $101.7 million for the year ended December 31, 2011 represented a termination fee from our previously announced merger agreement with Transatlantic.

Net Losses and Loss Expenses

Net losses and loss expenses increased by $180.1 million, or 18.8%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The loss and loss expense ratio decreased by 0.7 percentage points for the same period. The increase in net losses and loss expenses was due to the growth in net premiums earned and lower prior year net favorable reserve development. This was partially offset by lower property catastrophe losses in 2012 compared to 2011.

During the year ended December 31, 2012, we incurred $179.6 million of catastrophe-related losses, of which $175.7 million related to Superstorm Sandy and $3.9 million related to Hurricane Isaac. During the year ended December 31, 2011, we incurred $292.2 million of catastrophe-related losses, of which $96.5 million related to the Tohoku earthquake and tsunami, $58.6 million related to the New Zealand earthquake, $53.7 million related to the Midwestern U.S. storms, $43.0 million related to the Thailand floods, $23.7 million related to Hurricane Irene and $16.7 million related to the Australian storms.

Excluding the prior year reserve development, property catastrophe losses and the impact of the commutation, the loss and loss expense ratios would have been 64.5% and 62.9% for the years ended December 31, 2012 and 2011, respectively. The increase was primarily due to the $36.4 million in crop reinsurance losses for the year ended December 31, 2012 that increased the loss and loss expense ratio by 2.1 percentage points.


	Year Ended December 31, 2012						Year Ended December 31, 2011						Dollar			Change in Percentage
	Amount			% of NPE (1)			Amount			% of NPE (1)(2)			Change			Points
	($ in millions)
Non-catastrophe	$	1,130.0			64.5	%	$	909.0			62.9	%	$	221.0			1.6	Pts
Property catastrophe		179.6			10.3			292.2			20.2			(112.6	)		(9.9	)

Current year		1,309.6			74.8			1,201.2			83.1			108.4			(8.3	)
Prior year		(170.3	)		(9.7	)		(253.5	)		(17.5	)		83.2			7.8
Impact of commutation (3)		—			—			11.5			0.2			(11.5	)		(0.2	)

Net losses and loss expenses	$	1,139.3			65.1	%	$	959.2			65.8	%	$	180.1			(0.7	)Pts

(1)	“NPE” means net premiums earned.

(2)	Current year and prior year losses as a % of NPE are calculated excluding the effect of the commutation on net premiums earned.

(3)	Reflects the impact of the commutation of prior year contracts in the year ended December 31, 2011, which increased prior year net losses and loss expenses by $11.5 million and increased net premiums earned by $12.4 million.

We recorded net favorable reserve development related to prior years of $170.3 million during the year ended December 31, 2012 compared to net favorable reserve development of $253.5 million for the year ended December 31, 2011, as shown in the tables below.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2012
	2002			2003			2004			2005			2006			2007			2008			2009			2010			2011		Total
	($ in millions)
U.S. insurance	$	(0.6	)	$	0.5		$	(2.2	)	$	(5.4	)	$	(19.3	)	$	(28.6	)	$	(6.0	)	$	(3.0	)	$	12.5		$	35.2	$	(16.9	)
International insurance		5.2			(4.0	)		(6.3	)		(3.8	)		(54.4	)		(42.3	)		(21.7	)		(4.9	)		(6.9	)		16.1		(123.0	)
Reinsurance		(0.3	)		(0.1	)		(0.5	)		(2.0	)		(8.0	)		(19.9	)		(7.2	)		(0.0	)		5.5			2.1		(30.4	)

	$	4.3		$	(3.6	)	$	(9.0	)	$	(11.2	)	$	(81.7	)	$	(90.8	)	$	(34.9	)	$	(7.9	)	$	11.1		$	53.4	$	(170.3	)

The net favorable reserve development is a result of actual loss emergence being lower than anticipated. The unfavorable reserve development in our U.S. insurance segment for the 2010 and 2011 loss years was primarily due to adverse development of $25.1 million on a program that commenced writing in 2008 and was terminated during 2011. We also experienced adverse development for the 2011 loss year for certain errors and omissions products. The unfavorable reserve development in our international insurance segment for the 2011 loss year was due to adverse development on an individual claim, estimated to reach our full limit of $20.0 million, net of reinsurance.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2011
	2002			2003			2004			2005			2006			2007			2008			2009			2010			Total
	($ in millions)
U.S. insurance	$	(0.4	)	$	(2.9	)	$	(4.6	)	$	(20.5	)	$	19.1		$	(7.6	)	$	(4.7	)	$	(7.2	)	$	5.6		$	(23.2	)
International insurance		0.8			4.1			(6.7	)		(33.3	)		(45.3	)		(40.5	)		(14.6	)		(10.1	)		27.1			(118.5	)
Reinsurance		(0.4	)		(2.5	)		(10.9	)		(35.6	)		(16.0	)		(20.7	)		(2.3	)		(10.8	)		(12.6	)		(111.8	)

	$	—		$	(1.3	)	$	(22.2	)	$	(89.4	)	$	(42.2	)	$	(68.8	)	$	(21.6	)	$	(28.1	)	$	20.1		$	(253.5	)

The unfavorable reserve development of $19.1 million in our U.S. insurance segment for the 2006 loss year was primarily due to directors and officers claims within our professional liability line of business related to a class action suit filed against a number of private equity firms alleging collusion. The unfavorable reserve development in our international insurance segment for the 2010 loss year was primarily due to a casualty claim emanating from an oil field services risk.

The following table shows the components of net losses and loss expenses for the years ended December 31, 2012 and 2011.


	Year Ended December 31,				Dollar
	2012		2011		Change
	($ in millions)
Net losses paid	$	861.0	$	684.8	$	176.2
Net change in reported case reserves		131.0		213.3		(82.3	)
Net change in IBNR		147.3		61.1		86.2

Net losses and loss expenses	$	1,139.3	$	959.2	$	180.1

The table below is a reconciliation of the beginning and ending reserves for losses and loss expenses. Losses incurred and paid are reflected net of reinsurance recoverables:


	Year Ended December 31,
	2012			2011
	($ in millions)
Net reserves for losses and loss expenses, January 1	$	4,222.2		$	3,951.6
Incurred related to:
Commutation of variable rated reinsurance contracts		—			11.5
Current year non-catastrophe		1,130.0			909.0
Current year property catastrophe		179.6			292.2
Prior year		(170.3	)		(253.5	)

Total incurred		1,139.3			959.2

Paid related to:
Current year non-catastrophe		99.1			72.1
Current year property catastrophe		18.1			70.1
Prior year		743.8			542.6

Total paid		861.0			684.8
Foreign exchange revaluation		3.9			(3.8	)

Net reserve for losses and loss expenses, December 31		4,504.4			4,222.2
Losses and loss expenses recoverable		1,141.1			1,002.9

Reserve for losses and loss expenses, December 31	$	5,645.5		$	5,225.1

Acquisition Costs

Acquisition costs increased by $38.4 million, or 23.0%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The increase in acquisition costs was primarily due to the increase in net premiums earned. Acquisition costs as a percentage of net premiums earned were 11.8% for the year ended December 31, 2012 compared to 11.5% for 2011. The increase is due to the growth in our reinsurance segment, which has a higher acquisition cost ratio.

General and Administrative Expenses

General and administrative expenses increased by $35.7 million, or 13.1%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The increase in general and administrative expenses was primarily due to increased salary and related costs as average headcount increased by 9.6% to support our continued growth, combined with increased stock compensation expense resulting from the 25.2% increase in our share price during the year and higher performance-based compensation expense as profitability exceeded target levels.

Our general and administrative expense ratio was 17.6% for the year ended December 31, 2012 compared to 18.6% for the year ended December 31, 2011. The decrease was due to the growth in net premiums earned being greater than the increase in expenses, primarily due to the growth in our reinsurance segment, which has a lower general and administrative expense ratio.

The expense ratio is the sum of the acquisition cost ratio and the general and administrative expense ratio. Our expense ratio was 29.4% for the year ended December 31, 2012 compared to 30.1% for the year ended December 31, 2011.

Amortization of Intangible Assets

The amortization of intangible assets decreased by $0.5 million, or 16.7%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The decrease is due to certain intangible assets that were fully amortized during 2011.

Interest Expense

Interest expense increased by $0.4 million, or 0.7%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The increase was due to fees associated with the termination of our $400 million unsecured credit facility on June 7, 2012.

Income Tax Expense

Corporate income tax expense or benefit is generated through our operations in Bermuda, Europe, Hong Kong, Singapore and the United States. Our income tax expense or benefit may fluctuate significantly from period to period depending on the geographic distribution of pre-tax net income or loss in any given period between different jurisdictions with different tax rates. The geographic distribution of pre-tax net income or loss can vary significantly between periods principally due to the geographic location of the business written, the mix of business and the profitability of such business; the geographic location of investment income; the geographic location of net losses and loss expenses incurred; and the amount of inter-company reinsurance utilized for rating agency purposes.

Income tax expense decreased by $12.6 million for the year ended December 31, 2012 compared to the year ended December 31, 2011. The decrease is due to the lower income before income taxes in the United States due to the losses from Superstorm Sandy and the drought in the United States. In addition, the year ended December 31, 2011 also included higher taxable income from our holding company in Switzerland of approximately $90.6 million due to the merger termination fee income received.

Net Income

Net income for the year ended December 31, 2012 was $493.0 million compared to $274.5 million for the year ended December 31, 2011. The $218.5 million increase was primarily the result of lower catastrophe losses of $112.6 million, combined with the $296.3 million increase in our realized investment gains as markets and economic conditions rebounded during the year.

Comparison of Years Ended December 31, 2011 and 2010

Premiums

Gross premiums written increased by $181.1 million, or 10.3%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The overall increase in gross premiums written was primarily the result of the following:

•

Gross premiums written in our U.S. insurance segment increased by $109.3 million, or 15.0%. The increase in gross premiums written was primarily due to increased new business, including from new products, for the year ended December 31, 2011 compared to the year ended December 31, 2010. This growth was partially offset by the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions) and increased competition.

•

Gross premiums written in our international insurance segment increased by $25.5 million, or 5.1%, due to increased premiums in our general property and healthcare lines and new business including new products. This growth was partially offset by the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions) and increased competition.

•

Gross premiums written in our reinsurance segment increased by $46.3 million, or 8.8%. The increase in gross premiums written was primarily due to increased new business, including gross premiums written by our new global marine and specialty division and the continued build-out of our international platform, particularly in Asia. This growth was partially offset by the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions).

The table below illustrates our gross premiums written by geographic location for each of the years indicated.


	Year Ended December 31,				Dollar		Percentage
	2011		2010		Change		Change
	($ in millions)
United States	$	1,080.1	$	993.5	$	86.6		8.7	%
Bermuda		565.8		545.6		20.2		3.7	%
Europe		210.4		193.0		17.4		9.0	%
Singapore		68.4		17.0		51.4		302.4	%
Hong Kong		14.8		9.3		5.5		59.1	%

	$	1,939.5	$	1,758.4	$	181.1		10.3	%

Net premiums written increased by $141.4 million, or 10.2%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The increase in net premiums written was primarily due to the increase in gross premiums written. During the year ended December 31, 2011, premiums ceded were reduced by $12.4 million due to the commutation of certain variable-rated reinsurance contracts that have swing-rated provisions.

A “swing-rated” reinsurance contract links the ultimate amount of ceded premium to the ultimate loss ratio on the reinsured business. It enables the cedent to retain a greater portion of premium if the ultimate loss ratio develops at a level below the initial loss threshold set by the reinsurers, but requires a higher amount of ceded premium if the ultimate loss ratio develops above the initial threshold. In commuting these swing-rated reinsurance contracts, we reduced certain premiums previously ceded and also reduced ceded IBNR by $11.5 million in accordance with the terms of the contracts. During the year ended December 31, 2010, net premiums written included a $9.3 million reduction in premiums ceded for the commutation of certain variable-rated reinsurance contracts.

The difference between gross and net premiums written is the cost to us of purchasing reinsurance coverage, including the cost of property catastrophe reinsurance coverage. We ceded 20.9% of gross premiums written for the year ended December 31, 2011 compared to 20.8% for the year ended December 31, 2010.

Net premiums earned increased by $97.5 million, or 7.2%, for the year ended December 31, 2011 compared to the year ended December 31, 2010 as a result of higher net premiums earned for the U.S. insurance and reinsurance segments. This is driven by increased net premiums written in the current and prior periods, as well as the impact of the commutation of the swing-rated reinsurance contracts, which are fully earned.

The following chart illustrates the mix of our business on both a gross premiums written and net premiums earned basis.


	Gross Premiums Written						Net Premiums Earned
	Year Ended December 31,						Year Ended December 31,
	2011			2010			2011			2010
U.S. insurance		43.3	%		41.5	%		40.1	%		38.1	%
International insurance		27.3	%		28.7	%		21.8	%		24.9	%
Reinsurance		29.4	%		29.8	%		38.1	%		37.0	%

Total		100.0	%		100.0	%		100.0	%		100.0	%

Net Investment Income

Net investment income decreased by $48.2 million, or 19.7%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The decrease was due to lower yields on our fixed maturity investments as well as an increased allocation to equity securities and other invested assets which contribute to our total return but carry little or no current yield. We increased our equity and other invested assets by $385.3 million between December 31, 2011 and December 31, 2010. The book yield of the investment portfolio for the years ended December 31, 2011 and 2010 was 2.5% and 3.3%, respectively. Investment management expenses of $14.2 million and $11.7 million were incurred during the years ended December 31, 2011 and 2010, respectively. The increase in investment management expenses was due to the increase in the size of our investment portfolio as well as expenses from higher expense asset classes (equities).

As of December 31, 2011, approximately 92.6% of our fixed income investments consisted of investment grade securities. The average credit rating of our fixed income portfolio was AA — as rated by Standard & Poor’s and Aa3 as rated by Moody’s, with an average duration of approximately 1.9 years as of December 31, 2011. The average duration of the investment portfolio was 2.7 years as of December 31, 2010.

Net Realized Investment Gains and Net Impairment Charges Recognized in Earnings

Net realized investment gains were comprised of the following:


	Year Ended December 31,
	2011			2010
	($ in millions)
Gross realized gains on sale of invested assets	$	154.9		$	242.4
Gross realized losses on sale of invested assets		(62.1	)		(26.6	)

Net realized gains on sale of invested assets		92.8			215.8
Net realized and unrealized losses on derivatives		(70.1	)		(4.0	)
Mark-to-market changes:
Debt securities, trading		(8.1	)		42.2
Other invested assets and equity securities		(4.5	)		29.7

Total mark-to-market changes		(12.6	)		71.9
Gain on sale of Program Administrator		—			1.9

Net realized investment gains	$	10.1		$	285.6

During the year ended December 31, 2011, we did not recognize any net impairment charges compared to $0.2 million in net impairment charges recognized in earnings during the year ended December 31, 2010. In July 2010, the Company sold its program administrator and wholesale brokerage operations for $2.4 million in cash. The total return of our investment portfolio was 2.0% and 6.1% for the years ended December 31, 2011 and 2010, respectively.

Other Income

The other income of $101.7 million for the year ended December 31, 2011 represented a termination fee from our previously announced merger agreement with Transatlantic.

The other income of $0.9 million for the year ended December 31, 2010 represents fee income from our program administrator operations and wholesale brokerage operations. We sold these operations during the year ended December 31, 2010.

Net Losses and Loss Expenses

Net losses and loss expenses increased by $251.3 million, or 35.5%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The loss and loss expense ratio increased by 13.7 percentage points for the same period. The increase in net losses and loss expenses was due to lower prior year net favorable reserve development and higher property catastrophe losses in 2011 compared to 2010.

During the year ended December 31, 2011, we incurred $292.2 million of catastrophe-related losses, of which $96.5 million related to the Tohoku earthquake and tsunami, $58.6 million related to the New Zealand earthquake, $53.7 million related to the Midwestern U.S. storms, $43.0 million related to the Thailand floods, $23.7 million related to Hurricane Irene and $16.7 million related to the Australian storms. During the year ended December 31, 2010, we incurred $98.4 million of catastrophe-related losses, of which $66.8 million was from the Chilean earthquake, $17.0 million from the New Zealand earthquake and $14.6 million from the Australian floods.

Excluding the prior year reserve development, property catastrophe losses and the impact of the commutations, the loss and loss expense ratios would have been 62.9% and 67.7% for the years ended December 31, 2011 and 2010, respectively.


	Year Ended December 31, 2011						Year Ended December 31, 2010						Dollar			Change in Percentage
	Amount			% of NPE(2)			Amount			% of NPE(2)			Change			Points
	($ in millions)
Non-catastrophe	$	909.0			62.9	%	$	913.9			67.7	%	$	(4.9	)		(4.8	)Pts
Property catastrophe		292.2			20.2			98.4			7.3			193.8			12.9

Current year		1,201.2			83.1			1,012.3			75.0			188.9			8.1
Prior year		(253.5	)		(17.5	)		(313.3	)		(23.2	)		59.8			5.7
Impact of commutation(1)		11.5			0.2			8.9			0.3			2.6			(0.1	)

Net losses and loss expenses	$	959.2			65.8	%	$	707.9			52.1	%	$	251.3			13.7Pts

(1)	Reflects the impact of the commutation of prior year contracts in the years ended December 31, 2011 and 2010, which increased prior year net losses and loss expenses by $11.5 million and $8.9 million and increased net premiums earned by $12.4 million and $9.3 million, respectively.

(2)	Current year and prior year losses as a % of NPE are calculated excluding the effect of the commutation on net premiums earned.

We recorded net favorable reserve development related to prior years of $253.5 million and $313.3 million during the years ended December 31, 2011 and 2010, respectively, as shown in the tables below.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2011
	2002			2003			2004			2005			2006			2007			2008			2009			2010			Total
	($ in millions)
U.S. insurance	$	(0.4	)	$	(2.9	)	$	(4.6	)	$	(20.5	)	$	19.1		$	(7.6	)	$	(4.7	)	$	(7.2	)	$	5.6		$	(23.2	)
International insurance		0.8			4.1			(6.7	)		(33.3	)		(45.3	)		(40.5	)		(14.6	)		(10.1	)		27.1			(118.5	)
Reinsurance		(0.4	)		(2.5	)		(10.9	)		(35.6	)		(16.0	)		(20.7	)		(2.3	)		(10.8	)		(12.6	)		(111.8	)

	$	—		$	(1.3	)	$	(22.2	)	$	(89.4	)	$	(42.2	)	$	(68.8	)	$	(21.6	)	$	(28.1	)	$	20.1		$	(253.5	)

The net favorable reserve development is a result of actual loss emergence being lower than anticipated. The unfavorable reserve development in our U.S. insurance segment for the 2006 loss year was primarily due to directors and officers claims within our professional liability line of business related to a class action suit filed against a number of private equity firms alleging collusion. The unfavorable reserve development in our international insurance segment for the 2010 loss year was primarily due to a casualty claim emanating from an oil field service risk.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2010
	2003			2004			2005			2006			2007			2008			2009			2010			Total
	($ in millions)
U.S. insurance	$	(1.6	)	$	(3.2	)	$	(25.6	)	$	(26.2	)	$	(5.3	)	$	(1.7	)	$	(2.5	)	$	(2.4	)	$	(68.5	)
International insurance		6.8			(6.7	)		(21.6	)		(87.5	)		(36.7	)		(19.3	)		(23.1	)		7.5			(180.6	)
Reinsurance		(0.9	)		(1.0	)		(9.8	)		(33.0	)		(12.4	)		(3.8	)		3.0			(6.3	)		(64.2	)

	$	4.3		$	(10.9	)	$	(57.0	)	$	(146.7	)	$	(54.4	)	$	(24.8	)	$	(22.6	)	$	(1.2	)	$	(313.3	)

The following table shows the components of net losses and loss expenses for the years ended December 31, 2011 and 2010.


	Year Ended December 31,				Dollar
	2011		2010		Change
	($ in millions)
Net losses paid	$	684.8	$	596.7	$	88.1
Net change in reported case reserves		213.3		76.2		137.1
Net change in IBNR		61.1		35.0		26.1

Net losses and loss expenses	$	959.2	$	707.9	$	251.3

The increase in net losses paid for the year ended December 31, 2011 was due to higher paid losses in our U.S. insurance and reinsurance segments as a result of continued growth in these segments, combined with higher current period property catastrophe paid losses. The increase in reported case reserves was primarily due to higher case reserves in each of our operating segments. The increase in IBNR was due to higher IBNR in our international insurance segment as a result of lower net favorable reserve development.

The table below is a reconciliation of the beginning and ending reserves for losses and loss expenses. Losses incurred and paid are reflected net of reinsurance recoverables:


	Year Ended December 31,
	2011			2010
	($ in millions)
Net reserves for losses and loss expenses, January 1	$	3,951.6		$	3,841.8
Incurred related to:
Commutation of variable rated reinsurance contracts		11.5			8.9
Current year non-catastrophe		909.0			913.9
Current year property catastrophe		292.2			98.4
Prior year		(253.5	)		(313.3	)

Total incurred		959.2			707.9

Paid related to:
Current year non-catastrophe		72.1			61.0
Current year property catastrophe		70.1			37.6
Prior year		542.6			498.1

Total paid		684.8			596.7
Foreign exchange revaluation		(3.8	)		(1.4	)

Net reserve for losses and loss expenses, December 31		4,222.2			3,951.6
Losses and loss expenses recoverable		1,002.9			927.6

Reserve for losses and loss expenses, December 31	$	5,225.1		$	4,879.2

Acquisition Costs

Acquisition costs increased by $7.8 million, or 4.9%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The increase in acquisition costs was primarily due to the increase in net premiums earned in our U.S. insurance segment and reinsurance segment. Acquisition costs as a percentage of net premiums earned were 11.5% for the year ended December 31, 2011 compared to 11.7% in 2010.

General and Administrative Expenses

General and administrative expenses decreased by $14.9 million, or 5.2%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The decrease in general and administrative expenses was primarily due to the following:

•

A decrease of $5.9 million in incentive-based compensation due to higher loss activity during the year ended December 31, 2011.

•

A decrease of $7.0 million in stock related compensation due to a decrease in overall awards granted during the year ended December 31, 2011, in addition to a one-time increase of $4.3 million during the year ended December 31, 2010 to recognize expected performance above the target level for our performance-based awards granted in 2009.

•

During the year ended December 31, 2010 we incurred a one-time 1% capital stamp duty of $1.6 million related to a capital contribution of $160.0 million from Allied World Bermuda to Allied World Switzerland.

Our general and administrative expense ratio was 18.6% for the year ended December 31, 2011, which was lower than the 21.1% for the year ended December 31, 2010. The decrease was primarily due to the factors discussed above in addition to the increase in net premiums earned.

Our expense ratio was 30.1% for the year ended December 31, 2011 compared to 32.8% for the year ended December 31, 2010 primarily due to a decrease in the general and administrative expense ratio.

Amortization of Intangible Assets

The amortization of intangible assets decreased $0.5 million, or 14.3%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The decrease was due to the non-compete covenants related to the acquisition of Darwin being fully amortized during 2010. No impairments were recognized during the year ended December 31, 2011.

Interest Expense

Interest expense increased $14.8 million, or 36.8%, for the year ended December 31, 2011 compared to the year ended December 31, 2010 primarily as a result of additional interest expense on our 5.5% senior notes that were issued by Allied World Bermuda in November 2010.

Income Tax Expense

Tax expense increased $4.1 million, or 15.2%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The increase in tax expense is primarily due to higher taxable income for our Swiss holding company of approximately $90.6 million partially offset by lower taxable income for our U.S. operations of approximately $12.9 million. In addition, 2010 included a $5.0 million loss for tax purposes on the sale of our program administrator and wholesale brokerage operation which caused a reduction in tax expense in 2010 of $1.7 million. Our consolidated effective tax rates for the years ended December 31, 2011 and 2010 were 10.1% and 3.9%, respectively.

Net Income

Net income for the year ended December 31, 2011 was $274.5 million compared to $665.0 million for the year ended December 31, 2010. The decrease was primarily the result of lower net realized investment gains, higher net loss and loss expenses, and lower net investment income. Net income for the year ended December 31, 2011 included a net foreign exchange loss of $3.1 million compared to $0.4 million for the year ended December 31, 2010.

Underwriting Results by Operating Segments

Our company is organized into three operating segments:

U.S. Insurance Segment. The U.S. insurance segment includes our direct specialty insurance operations in the United States. This segment provides both direct property and specialty casualty insurance primarily to non-Fortune 1000 North American domiciled accounts.

International Insurance Segment. The international insurance segment includes our direct insurance operations in Bermuda, Europe, Singapore and Hong Kong. This segment provides both direct property and casualty insurance primarily to Fortune 1000 North American domiciled accounts from our Bermuda office and non-North American domiciled accounts from our European, Singapore and Hong Kong offices.

Reinsurance Segment. Our reinsurance segment has operations in Bermuda, Europe, Singapore and the United States. This segment includes the reinsurance of property, general casualty, professional liability, specialty lines and property catastrophe coverages written by insurance companies. We presently write reinsurance on both a treaty and a facultative basis, targeting several niche reinsurance markets.

U.S. Insurance Segment

The following table summarizes the underwriting results and associated ratios for the U.S. insurance segment for each of the years ended December 31, 2012, 2011 and 2010.


	Year Ended December 31,
	2012			2011			2010
	($ in millions)
Revenues
Gross premiums written	$	993.9		$	838.6		$	729.3
Net premiums written		743.4			639.2			551.1
Net premiums earned		671.6			584.3			518.4
Other income		—			—			0.9
Expenses
Net losses and loss expenses	$	465.2		$	387.1		$	297.5
Acquisition costs		86.7			75.0			67.8
General and administrative expenses		141.7			124.4			128.5
Underwriting (loss) income		(22.0	)		(2.2	)		25.5
Ratios
Loss and loss expense ratio		69.3	%		66.2	%		57.4	%
Acquisition cost ratio		12.9	%		12.8	%		13.1	%
General and administrative expense ratio		21.1	%		21.3	%		24.8	%

Expense ratio		34.0	%		34.1	%		37.9	%

Combined ratio		103.3	%		100.3	%		95.3	%

Comparison of Years Ended December 31, 2012 and 2011

Premiums. Gross premiums written increased by $155.3 million, or 18.5%, for the year ended December 31, 2012 compared to 2011. The increase in gross premiums written was primarily due to new business across most lines that added $320.7 million during the year, combined with premium rate increases in all lines of business. Growth from new products introduced in 2012, such as mergers and acquisitions and primary construction, contributed a further $7.6 million for the year. This growth was partially offset by the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions) and continued competition.

The table below illustrates our gross premiums written by line of business for each of the periods indicated.


	Year Ended December 31,				Dollar		Percentage
	2012		2011		Change		Change
	($ in millions)
General casualty	$	269.6	$	205.3	$	64.3		31.3	%
Professional liability		260.8		235.4		25.4		10.8	%
Healthcare		207.3		201.7		5.6		2.8	%
Programs		105.3		87.1		18.2		20.9	%
General property		94.3		78.5		15.8		20.1	%
Other(1)		56.6		30.6		26.0		85.0	%

	$	993.9	$	838.6	$	155.3		18.5	%

(1)	Includes our inland marine, environmental and mergers and acquisitions lines of business

Net premiums written increased by $104.2 million, or 16.3%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The increase in net premiums written was primarily due to higher gross premiums written, partially offset by the impact of the commutation of prior year contracts in 2011. The year ended December 31, 2011 included a $12.4 million reduction in premiums ceded due to the commutation of certain variable-rated reinsurance contracts that had swing-rated provisions. We ceded 25.2% of gross premiums written for the year ended December 31, 2012 compared to 23.8% for 2011. The increase in the cession percentage was due to the impact of the commutation on the prior year, which decreased the 2011 cession percentage by 1.5 percentage points.

Net premiums earned increased by $87.3 million, or 14.9%, for the year ended December 31, 2012 compared to 2011. The increase was primarily due to the growth of our U.S. insurance operations during 2012 and 2011, partially offset by the $12.4 million impact of the commutation of prior year contracts in 2011, which was fully earned.

Net losses and loss expenses. Net losses and loss expenses increased by $78.1 million, or 20.2%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The loss and loss expense ratio increased by 3.1 percentage points for the same period. The increase in net losses and loss expenses was primarily due to growth in net premiums earned, increased property catastrophe losses and lower favorable prior year reserve development in 2012 compared to 2011. This was partially offset by the $11.5 million impact of the commutation of prior year contracts in 2011.

During the year ended December 31, 2012, we incurred $23.0 million of catastrophe-related losses, of which $21.0 million related to Superstorm Sandy and $2.0 million related to Hurricane Isaac. During the year ended December 31, 2011, we incurred $8.3 million of catastrophe-related losses, of which $3.8 million related to the Midwestern U.S. storms and $4.5 million related to Hurricane Irene.

Excluding the prior year reserve development, property catastrophe losses and the impact of the commutation, the loss and loss expense ratios would have been 68.4% and 68.3% for the years ended December 31, 2012 and 2011, respectively.


	Year Ended						Year Ended									Change in
	December 31, 2012						December 31, 2011						Dollar			Percentage
	Amount			% of NPE			Amount			% of NPE(2)			Change			Points
	($ in millions)
Non-catastrophe	$	459.1			68.4	%	$	390.5			68.3	%	$	68.6			0.1	Pts
Property catastrophe		23.0			3.4			8.3			1.5			14.7			1.9

Current year		482.1			71.8			398.8			69.8			83.3			2.0
Prior year		(16.9	)		(2.5	)		(23.2	)		(4.1	)		6.3			1.6
Impact of commutation(1)		—			—			11.5			0.5			(11.5	)		(0.5	)

Net losses and loss expenses	$	465.2			69.3	%	$	387.1			66.2	%	$	78.1			3.1	Pts

(1)	Reflects the impact of the commutation of prior year contracts in the year ended December 31, 2011, which increased prior year net losses and loss expenses by $11.5 million and increased net premiums earned by $12.4 million.

(2)	Current year and prior year losses as a % of NPE are calculated excluding the effect of the commutation on net premiums earned.

Overall, our U.S. insurance segment recorded net favorable reserve development of $16.9 million during the year ended December 31, 2012 compared to net favorable reserve development of $23.2 million for the year ended December 31, 2011, as shown in the tables below.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2012
	2002			2003			2004			2005			2006			2007			2008			2009			2010			2011		Total
	($ in millions)
General casualty	$	(0.1	)	$	(0.7	)	$	(0.2	)	$	(1.2	)	$	(12.3	)	$	(3.3	)	$	(3.4	)	$	(0.6	)	$	(0.1	)	$	—	$	(21.9	)
Professional liability		(0.5	)		(0.5	)		(2.0	)		(0.9	)		(1.0	)		(20.5	)		(3.8	)		(5.1	)		(4.7	)		24.7		(14.3	)
Healthcare		—			1.7			(1.0	)		(3.1	)		(5.1	)		(4.6	)		(0.1	)		(2.2	)		2.3			—		(12.1	)
Other		—			—			—			—			—			—			—			—			—			1.7		1.7
General property		—			—			1.0			(0.2	)		(0.1	)		(0.2	)		1.3			1.0			1.1			1.0		4.9
Programs		—			—			—			—			(0.8	)		—			—			3.9			13.9			7.8		24.8

	$	(0.6	)	$	0.5		$	(2.2	)	$	(5.4	)	$	(19.3	)	$	(28.6	)	$	(6.0	)	$	(3.0	)	$	12.5		$	35.2	$	(16.9	)

The unfavorable reserve development for the 2010 and 2011 loss years was primarily due to adverse development of $25.1 million on a program that commenced writing in 2008 and was terminated during 2011. This was partially offset by favorable development on our active programs. We also experienced adverse development for the 2011 loss year for certain professional liability products.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2011
	2002			2003			2004			2005			2006			2007			2008			2009			2010			Total
	($ in millions)
General casualty	$	—		$	(0.9	)	$	(1.5	)	$	(17.4	)	$	(2.9	)	$	2.5		$	(1.9	)	$	(0.9	)	$	0.5		$	(22.5	)
Professional liability		—			(0.2	)		(0.3	)		(2.5	)		23.4			(7.0	)		(0.8	)		(6.4	)		7.1			13.3
Healthcare		(0.4	)		(1.8	)		(2.7	)		—			(1.4	)		0.1			(0.9	)		0.3			(2.6	)		(9.4	)
Other		—			—			—			—			—			—			—			—			—			—
General property		—			—			(0.1	)		(0.4	)		0.1			(1.1	)		(0.3	)		(1.0	)		(1.2	)		(4.0	)
Programs		—			—			—			(0.2	)		(0.1	)		(2.1	)		(0.8	)		0.8			1.8			(0.6	)

	$	(0.4	)	$	(2.9	)	$	(4.6	)	$	(20.5	)	$	19.1		$	(7.6	)	$	(4.7	)	$	(7.2	)	$	5.6		$	(23.2	)

The unfavorable reserve development of $23.4 million for the 2006 loss year was primarily due to directors and officers claims within our professional liability line of business related to a class action suit filed against a number of private equity firms alleging collusion.

Acquisition costs. Acquisition costs increased by $11.7 million, or 15.6%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The increase was primarily caused by increased net premiums earned. The acquisition cost ratio increased to 12.9% for the year ended December 31, 2012 from 12.8% for 2011.

General and administrative expenses. General and administrative expenses increased by $17.3 million, or 13.9%, for the year ended December 31, 2012 compared to the year ended December 31, 2011, due to the continued growth of our U.S. insurance operations. The increase in general and administrative expenses was primarily due to increased salary and related costs as average headcount increased to support our continued growth, combined with increased stock compensation expense resulting from the 25.2% increase in our share price during the year and an increase in performance-based compensation expense as results have exceeded target levels. The general and administrative expense ratio decreased to 21.1% for the year ended December 31, 2012 from 21.3% in 2011, as a result of our increased net premiums earned.

Comparison of Years Ended December 31, 2011 and 2010

Premiums. Gross premiums written increased by $109.3 million, or 15.0%, for the year ended December 31, 2011 compared to 2010. The increase in gross premiums written was primarily due to new business from existing products, $55.1 million in premiums from new products, specifically in our general casualty, environmental and inland marine lines of business and rate increases in our general property and general casualty lines of business. This growth was partially offset by the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions), rate reductions in our other lines of business and increased competition.

The table below illustrates our gross premiums written by line of business for each of the periods indicated.


	Year Ended December 31,				Dollar			Percentage
	2011		2010		Change			Change
	($ in millions)
Professional liability	$	235.4	$	211.1	$	24.3			11.5	%
General casualty		205.3		145.7		59.6			40.9	%
Healthcare		201.7		179.8		21.9			12.2	%
Programs		87.1		105.6		(18.5	)		(17.5	%)
General property		78.5		73.7		4.8			6.5	%
Other(1)		30.6		13.4		17.2			128.4	%

	$	838.6	$	729.3	$	109.3			15.0	%

(1)	Includes our inland marine, environmental and mergers and acquisitions lines of business

Net premiums written increased by $88.1 million, or 16.0%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The increase in net premiums written was primarily due to higher gross premiums written and the commutation of certain variable-rated reinsurance contracts that have swing-rated provisions, which reduced premiums ceded by $12.4 million. In commuting these swing-rated reinsurance contracts, we reduced certain premiums previously ceded and also reduced ceded losses by $11.5 million in accordance with the terms of the contracts. The net impact of the commutation was a net gain of $0.9 million. For the year ended December 31, 2010, the commutation of certain variable-rated reinsurance contracts reduced premiums ceded by $9.3 million. Overall, we ceded 23.8% of gross premiums written for the year ended December 31, 2011 compared to 24.4% for the year ended December 31, 2010. The decrease in the cession percentage was primarily due to the reduction of premiums ceded related to the commutation of the swing-rated reinsurance contracts. Excluding the impact of the commutation, we ceded 25.3% and 25.7% of gross premiums written during the years ended December 31, 2011 and 2010, respectively.

Net premiums earned increased $65.9 million, or 12.7%, resulting from the growth of our U.S. insurance operations during 2010 and 2011. Additionally, the commutation of swing-rated reinsurance contracts during the year ended December 31, 2011 added $12.4 million to net premiums earned compared to $9.3 million during the year ended December 31, 2010.

Net losses and loss expenses. Net losses and loss expenses increased by $89.6 million, or 30.1%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The loss and loss expense ratio increased 8.8 percentage points for the same period. The increase in net losses and loss expenses was primarily due to the growth in net premiums earned, increased property catastrophe losses and lower prior year net favorable reserve development.

During the year ended December 31, 2011, we incurred $8.3 million of catastrophe-related losses, of which $3.8 million related to the Midwestern U.S. storms and $4.5 million related to Hurricane Irene. During the year ended December 31, 2010, there were no property catastrophe-related losses.

Excluding the prior year reserve development, property catastrophe losses and the impact of the commutations, the loss and loss expense ratios would have been 68.3% and 70.1% for the years ended December 31, 2011and 2010, respectively. The year ended December 31, 2010 included a $12.0 million net loss on a Connecticut power plant explosion which increased the loss and loss expense ratio by 2.4 percentage points.


	Year Ended						Year Ended								Change in
	December 31, 2011						December 31, 2010						Dollar		Percentage
	Amount			% of NPE(2)			Amount			% of NPE(2)			Change		Points
	($ in millions)
Non-catastrophe	$	390.5			68.3	%	$	357.1			70.1	%	$	33.4		(1.8	)Pts
Property catastrophe		8.3			1.5			—			—			8.3		1.5

Current year		398.8			69.8			357.1			70.1			41.7		(0.3	)
Prior year		(23.2	)		(4.1	)		(68.5	)		(13.5	)		45.3		9.4
Impact of commutation(1)		11.5			0.5			8.9			0.8			2.6		(0.3	)

Net losses and loss expenses	$	387.1			66.2	%	$	297.5			57.4	%	$	89.6		8.8	Pts

(1)	Reflects the impact of the commutation of prior year contracts in the years ended December 31, 2011 and 2010, which increased prior year net losses and loss expenses by $11.5 million and $8.9 million and increased net premiums earned by $12.4 million and $9.3 million, respectively.

(2)	Current year and prior year losses as a % of NPE are calculated excluding the effect of the commutation on net premiums earned.

Overall, our U.S. insurance segment recorded net favorable reserve development of $23.2 million during the year ended December 31, 2011 compared to net favorable reserve development of $68.5 million for the year ended December 31, 2010 as shown in the tables below.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2011
	2002			2003			2004			2005			2006			2007			2008			2009			2010			Total
	($ in millions)
General casualty	$	—		$	(0.9	)	$	(1.5	)	$	(17.4	)	$	(2.9	)	$	2.5		$	(1.9	)	$	(0.9	)	$	0.5		$	(22.5	)
Professional liability		—			(0.2	)		(0.3	)		(2.5	)		23.4			(7.0	)		(0.8	)		(6.4	)		7.1			13.3
Healthcare		(0.4	)		(1.8	)		(2.7	)		—			(1.4	)		0.1			(0.9	)		0.3			(2.6	)		(9.4	)
General property		—			—			(0.1	)		(0.4	)		0.1			(1.1	)		(0.3	)		(1.0	)		(1.2	)		(4.0	)
Programs		—			—			—			(0.2	)		(0.1	)		(2.1	)		(0.8	)		0.8			1.8			(0.6	)

	$	(0.4	)	$	(2.9	)	$	(4.6	)	$	(20.5	)	$	19.1		$	(7.6	)	$	(4.7	)	$	(7.2	)	$	5.6		$	(23.2	)


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2010
	2002			2003			2004			2005			2006			2007			2008			2009			Total
	($ in millions)
General casualty	$	(1.4	)	$	(1.4	)	$	(2.6	)	$	(6.6	)	$	(1.4	)	$	(1.7	)	$	(1.5	)	$	(3.2	)	$	(19.8	)
Professional liability		—			(0.2	)		(0.3	)		(1.8	)		(0.2	)		0.9			(2.3	)		(3.7	)		(7.6	)
Healthcare		(0.2	)		(1.6	)		(21.9	)		(7.3	)		—			(0.6	)		3.2			—			(28.4	)
General property		—			—			(0.8	)		(10.5	)		(3.6	)		(1.8	)		(1.9	)		5.6			(13.0	)
Programs		—			—			—			(0.1	)		(0.1	)		1.6			—			(1.1	)		0.3

	$	(1.6	)	$	(3.2	)	$	(25.6	)	$	(26.3	)	$	(5.3	)	$	(1.6	)	$	(2.5	)	$	(2.4	)	$	(68.5	)

Acquisition costs. Acquisition costs increased by $7.2 million, or 10.6%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The increase was primarily caused by increased net premiums earned. The acquisition cost ratio decreased slightly to 12.8% for the year ended December 31, 2011 from 13.1% in 2010.

General and administrative expenses. General and administrative expenses decreased by $4.1 million, or 3.2%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The decrease in general and administrative expenses was primarily due to a decrease in performance based incentive compensation expenses. The decrease in the general and administrative expense ratio from 24.8% for the year ended December 31, 2010 to 21.3% in 2011 was primarily caused by increased net premiums earned and the decrease in expenses as discussed above.

International Insurance Segment

The following table summarizes the underwriting results and associated ratios for the international insurance segment for the years ended December 31, 2012, 2011 and 2010.


	Year Ended December 31,
	2012			2011			2010
	($ in millions)
Revenues
Gross premiums written	$	575.1		$	530.4		$	504.9
Net premiums written		346.3			325.1			319.1
Net premiums earned		336.8			317.0			338.8
Expenses
Net losses and loss expenses	$	163.1		$	206.6		$	160.2
Acquisition costs		(0.5	)		(2.8	)		(0.5	)
General and administrative expenses		91.9			84.3			94.2
Underwriting income		82.3			28.9			84.9
Ratios
Loss and loss expense ratio		48.4	%		65.2	%		47.3	%
Acquisition cost ratio		(0.1	%)		(0.9	%)		(0.1	%)
General and administrative expense ratio		27.3	%		26.6	%		27.8	%

Expense ratio		27.2	%		25.7	%		27.7	%

Combined ratio		75.6	%		90.9	%		75.0	%

Comparison of Years Ended December 31, 2012 and 2011

Premiums. Gross premiums written increased by $44.7 million, or 8.4%, for the year ended December 31, 2012 compared to 2011. The increase was primarily a result of new business, including $19.8 million from trade credit as a result of expansion into new regions, combined with rate increases in select lines of business. Professional liability increased $17.6 million, primarily due to new business, including $7.9 million from new product initiatives, and strong premium retention. However, this increase was partially offset by the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions), continued competition and a reduction in limits deployed for the international general property line of business.

100

The table below illustrates our gross premiums written by line of business for each of the periods indicated.


	Year Ended December 31,				Dollar			Percentage
	2012		2011		Change			Change
	($ in millions)
Professional liability	$	182.0	$	164.4	$	17.6			10.7	%
General property		157.2		159.4		(2.2	)		(1.4	%)
General casualty		131.6		127.2		4.4			3.5	%
Healthcare		73.2		68.1		5.1			7.5	%
Other(1)		31.1		11.3		19.8			175.2	%

	$	575.1	$	530.4	$	44.7			8.4	%

(1)	Includes our trade credit line of business

Net premiums written increased by $21.2 million, or 6.5%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. We ceded to reinsurers 39.8% of gross premiums written for the year ended December 31, 2012 compared to 38.7% for the year ended December 31, 2011.

Net premiums earned increased by $19.8 million, or 6.2%, primarily due to higher net premiums written in the latter half of 2011 and for the year ended December 31, 2012.

Net losses and loss expenses. Net losses and loss expenses decreased by $43.5 million, or 21.1%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The loss and loss expense ratio decreased by 16.8 percentage points for the same period. The decrease in net losses and loss expenses was primarily due to significantly lower catastrophe losses in 2012 compared to 2011, combined with higher net favorable prior year reserve development in 2012 compared to 2011.

During the year ended December 31, 2012, we incurred $75.6 million of catastrophe-related losses, of which $73.7 million related to Superstorm Sandy and $1.9 million related to Hurricane Isaac. During the year ended December 31, 2011, we incurred $107.6 million of catastrophe-related losses, of which $45.0 million related to the Tohoku earthquake and tsunami, $17.7 million related to the storms in the Midwestern United States, $12.7 million related to the New Zealand earthquake, $22.8 million related to the Thailand floods, $8.0 million related to Hurricane Irene and $1.4 million related to the Australian storms.

Excluding the prior year reserve development and property catastrophe losses, the loss and loss expense ratios would have been 62.5% and 68.7% for the years ended December 31, 2012 and 2011, respectively. The decrease was due to lower attritional property losses in 2012 compared to 2011.


	Year Ended						Year Ended									Change in
	December 31, 2012						December 31, 2011						Dollar			Percentage
	Amount			% of NPE			Amount			% of NPE			Change			Points
	($ in millions)
Non-catastrophe	$	210.5			62.5	%	$	217.5			68.7	%	$	(7.0	)		(6.2	)Pts
Property catastrophe		75.6			22.4			107.6			33.9			(32.0	)		(11.5	)

Current year		286.1			84.9			325.1			102.6			(39.0	)		(17.7	)
Prior year		(123.0	)		(36.5	)		(118.5	)		(37.4	)		(4.5	)		0.9

Net losses and loss expenses	$	163.1			48.4	%	$	206.6			65.2	%	$	(43.5	)		(16.8	)Pts

101

Overall, our international insurance segment recorded net favorable reserve development of $123.0 million during the year ended December 31, 2012 compared to net favorable reserve development of $118.5 million for the year ended December 31, 2011, as shown in the tables below.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2012
	2002			2003			2004			2005			2006			2007			2008			2009			2010			2011			Total
	($ in millions)
Professional liability	$	(0.4	)	$	(0.3	)	$	(3.0	)	$	(6.1	)	$	(34.6	)	$	(10.4	)	$	2.9		$	—		$	—		$	—		$	(51.9	)
General casualty		5.7			(2.8	)		(3.1	)		6.6			(18.5	)		(23.2	)		(10.6	)		(4.7	)		1.8			20.0			(28.8	)
Healthcare		(0.1	)		(0.9	)		(0.9	)		(2.5	)		(2.1	)		(9.4	)		(10.3	)		2.6			—			—			(23.6	)
General property		—			—			0.7			(1.8	)		0.8			0.7			(3.7	)		(2.8	)		(8.7	)		(3.9	)		(18.7	)

	$	5.2		$	(4.0	)	$	(6.3	)	$	(3.8	)	$	(54.4	)	$	(42.3	)	$	(21.7	)	$	(4.9	)	$	(6.9	)	$	16.1		$	(123.0	)

The net favorable reserve development for loss years 2003 to 2010 is a result of actual loss emergence being lower than anticipated. The unfavorable reserve development in our general casualty line for loss year 2011 was due to adverse development on an individual claim, estimated to reach our full limit of $20.0 million, net of reinsurance.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2011
	2002			2003			2004			2005			2006			2007			2008			2009			2010		Total
	($ in millions)
Professional liability	$	2.0		$	8.5		$	(6.1	)	$	(12.6	)	$	(18.9	)	$	(14.8	)	$	21.6		$	—		$	—	$	(20.3	)
General casualty		(1.0	)		(4.2	)		2.8			(16.0	)		(16.0	)		(14.1	)		(7.3	)		7.2			22.5		(26.1	)
Healthcare		(0.2	)		(0.1	)		(1.8	)		(2.0	)		(9.7	)		(10.5	)		—			0.2			—		(24.1	)
General property		—			(0.1	)		(1.6	)		(2.7	)		(0.7	)		(1.1	)		(28.9	)		(17.5	)		4.6		(48.0	)

	$	0.8		$	4.1		$	(6.7	)	$	(33.3	)	$	(45.3	)	$	(40.5	)	$	(14.6	)	$	(10.1	)	$	27.1	$	(118.5	)

The unfavorable reserve development for the 2010 loss year was primarily due to a casualty claim emanating from an oil field services risk.

Acquisition costs. Acquisition costs increased by $2.3 million, or 82.1%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The negative cost represents ceding commissions received on ceded premiums in excess of the brokerage fees and commissions paid on gross premiums written. The acquisition cost ratio was negative 0.1% for the year ended December 31, 2012 and negative 0.9% for the year ended December 31, 2011. The increase was due to growth in lines of business with higher acquisition costs, such as trade credit.

General and administrative expenses. General and administrative expenses increased by $7.6 million, or 9.0%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The increase in general and administrative expenses was primarily due to increased salary and related costs incurred as we continue to expand internationally, combined with higher incentive compensation due to increased profitability and the higher stock price. The general and administrative expense ratios for the years ended December 31, 2012 and 2011 were 27.3% and 26.6%, respectively. The increase was primarily due to increased incentive compensation as profitability improved.

102

Comparison of Years Ended December 31, 2011 and 2010

Premiums. Gross premiums written increased by $25.5 million, or 5.1%, for the year ended December 31, 2011 compared to 2010. The increase in gross premiums written was primarily a result of new business, including $12.5 million from new products, specifically related to our trade credit line of business and small to mid-sized enterprise insurance products. In addition, we increased premiums in our healthcare line of business and experienced rate increases within our general property line of business. This growth was partially offset by the continued trend of the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions) including the non-renewal of one general property policy that was previously written during the year ended December 31, 2010 for $5.1 million and the non-renewal of several policies totaling $15.7 million in our general casualty line of business.

The table below illustrates our gross premiums written by line of business for each of the periods indicated.


	Year Ended December 31,				Dollar			Percentage
	2011		2010		Change			Change
	($ in millions)
Professional liability	$	164.4	$	160.7	$	3.7			2.3	%
General property		159.4		150.7		8.7			5.8	%
General casualty		127.2		132.3		(5.1	)		(3.9	%)
Healthcare		68.1		59.3		8.8			14.8	%
Other(1)		11.3		1.9		9.4			n/m

	$	530.4	$	504.9	$	25.5			5.1	%

(1)	Includes our trade credit line of business

Net premiums written increased $6.0 million, or 1.9%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. Net premiums written increased at a lower percentage than gross premiums written due to an increase in ceded premiums written on our professional lines treaty as well as the establishment of a trade credit treaty. We ceded to reinsurers 38.7% of gross premiums written for the year ended December 31, 2011 compared to 36.8% for the year ended December 31, 2010. The increase is primarily due to increased cessions on our general casualty and professional liability lines of business.

Net premiums earned decreased $21.8 million, or 6.4%, primarily due to lower net premiums written during 2010.

Net losses and loss expenses. Net losses and loss expenses increased by $46.4 million, or 29.0%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The loss and loss expense ratio increased by 17.9 percentage points for the same period. The increase in net losses and loss expenses was primarily due to higher loss activity in the current period and lower net favorable reserve development recognized.

During the year ended December 31, 2011, we incurred $107.6 million of catastrophe-related losses, of which $45.0 million related to the Tohoku earthquake and tsunami, $17.7 million related to the storms in the Midwestern United States, $12.7 million related to the New Zealand earthquake, $22.8 million related to the Thailand floods, $8.0 million related to Hurricane Irene and $1.4 million related to the Australian storms.

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Excluding the prior year reserve development and property catastrophe losses, the loss and loss expense ratios would have been 68.7% and 81.7% for the years ended December 31, 2011 and 2010, respectively.


	Year Ended						Year Ended									Change in
	December 31, 2011						December 31, 2010						Dollar			Percentage
	Amount			% of NPE			Amount			% of NPE			Change			Points
	($ in millions)
Non-catastrophe	$	217.5			68.7	%	$	276.7			81.7	%	$	(59.2	)		(13.0	)Pts
Property catastrophe		107.6			33.9			64.1			18.9			43.5			15.0

Current year		325.1			102.6			340.8			100.6			(15.7	)		2.0
Prior year		(118.5	)		(37.4	)		(180.6	)		(53.3	)		62.1			15.9

Net losses and loss expenses	$	206.6			65.2	%	$	160.2			47.3	%	$	46.4			17.9	Pts

Overall, our international insurance segment recorded net favorable reserve development of $118.5 million during the year ended December 31, 2011 compared to net favorable reserve development of $180.6 million for the year ended December 31, 2010, as shown in the tables below.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2011
	2002			2003			2004			2005			2006			2007			2008			2009			2010		Total
	($ in millions)
Professional liability	$	2.0		$	8.5		$	(6.1	)	$	(12.6	)	$	(18.9	)	$	(14.8	)	$	21.6		$	—		$	—	$	(20.3	)
General casualty		(1.0	)		(4.2	)		2.8			(16.0	)		(16.0	)		(14.1	)		(7.3	)		7.2			22.5		(26.1	)
Healthcare		(0.2	)		(0.1	)		(1.8	)		(2.0	)		(9.7	)		(10.5	)		—			0.2			—		(24.1	)
General property		—			(0.1	)		(1.6	)		(2.7	)		(0.7	)		(1.1	)		(28.9	)		(17.5	)		4.6		(48.0	)

	$	0.8		$	4.1		$	(6.7	)	$	(33.3	)	$	(45.3	)	$	(40.5	)	$	(14.6	)	$	(10.1	)	$	27.1	$	(118.5	)

The unfavorable reserve development in our professional liability segment for the 2008 loss year related primarily to a greater reliance on the Bornhuetter-Ferguson reported loss method than on the expected loss ratio method. The unfavorable reserve development for the 2010 loss year was primarily due to a casualty claim emanating from an oil field service risk.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2010
	2002			2003			2004			2005			2006			2007			2008			2009			Total
	($ in millions)
Professional liability	$	2.0		$	(2.8	)	$	(4.1	)	$	(41.8	)	$	(0.2	)	$	—		$	—		$	—		$	(46.9	)
General casualty		5.1			(2.3	)		(15.3	)		(29.8	)		(7.6	)		(6.5	)		11.3			7.8			(37.3	)
Healthcare		(0.3	)		(1.5	)		(2.2	)		(9.9	)		(22.5	)		—			—			—			(36.4	)
General property		—			(0.1	)		—			(6.0	)		(6.4	)		(12.8	)		(34.4	)		(0.3	)		(60.0	)

	$	6.8		$	(6.7	)	$	(21.6	)	$	(87.5	)	$	(36.7	)	$	(19.3	)	$	(23.1	)	$	7.5		$	(180.6	)

Acquisition costs. Acquisition costs decreased $2.3 million for the year ended December 31, 2011 compared to the year ended December 31, 2010. The negative cost represents ceding commissions received on ceded premiums in excess of the brokerage fees and commissions paid on gross premiums written. The acquisition cost ratio decreased from negative 0.1% for the year ended December 31, 2010 to negative 0.9% for the year ended December 31, 2011.

General and administrative expenses. General and administrative expenses decreased $9.9 million, or 10.5%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The decrease in general and administrative expenses was primarily due to a decrease in incentive-based compensation due to higher loss activity as well as a decrease in staffing and related salaries and benefits. The year ended December 31, 2010 included one-time expenses in professional fees related to the establishment of Syndicate

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2232 and our efforts to effect our redomestication to Switzerland. These decreases were offset by an increase in fees for a full year of operating our Lloyd’s Syndicate 2232 of $4.4 million in 2011 versus six months of operation in 2010. The general and administrative expense ratios for the years ended December 31, 2011 and 2010 were 26.6% and 27.8%, respectively, due to lower general and administrative expenses.

Reinsurance Segment

The following table summarizes the underwriting results and associated ratios for the reinsurance segment for the years ended December 31, 2012, 2011 and 2010.


	Year Ended December 31,
	2012			2011			2010
	($ in millions)
Revenues
Gross premiums written	$	760.3		$	570.5		$	524.2
Net premiums written		748.1			569.5			522.3
Net premiums earned		740.5			555.7			502.3
Expenses
Net losses and loss expenses	$	511.0		$	365.5		$	250.2
Acquisition costs		119.5			95.1			92.1
General and administrative expenses		73.7			62.9			63.8
Underwriting income		36.3			32.2			96.2
Ratios
Loss and loss expense ratio		69.0	%		65.8	%		49.8	%
Acquisition cost ratio		16.1	%		17.1	%		18.3	%
General and administrative expense ratio		10.0	%		11.3	%		12.7	%

Expense ratio		26.1	%		28.4	%		31.0	%

Combined ratio		95.1	%		94.2	%		80.8	%

Comparison of Years Ended December 31, 2012 and 2011

Premiums. Gross premiums written increased by $189.8 million, or 33.3%, for the year ended December 31, 2012 compared to 2011. The increase in gross premiums written was primarily due to new business, from both new products and new regions, as well as increased participations on renewing business combined with rate increases. Within our specialty unit, crop reinsurance premiums increased by $48.1 million while marine contributed a further $21.7 million. Gross premiums written in our property reinsurance business also increased by $87.7 million. Gross premiums written in our North American property reinsurance grew $42.0 million as a result of new business and increased participations and our continued expansion into Asia and Latin America contributed a further $41.0 million. Casualty premiums increased $19.9 million, primarily due to the renewal of a $13.5 million expiring two year contract. This was partially offset by the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions) and continued competition.

The table below illustrates our gross premiums written by underwriter geographic location for our reinsurance operations.


	Year Ended December 31,				Dollar		Percentage
	2012		2011		Change		Change
	($ in millions)
United States	$	366.3	$	241.6	$	124.7		51.6	%
Bermuda		210.1		204.7		5.4		2.6	%
Singapore		106.5		66.6		39.9		59.9	%
Europe		77.4		57.6		19.8		34.4	%

	$	760.3	$	570.5	$	189.8		33.3	%

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The table below illustrates our gross premiums written by line of business for each of the periods indicated.


	Year Ended December 31,				Dollar		Percentage
	2012		2011		Change		Change
	($ in millions)
Property	$	354.6	$	266.9	$	87.7		32.9	%
Casualty		254.3		234.4		19.9		8.5	%
Specialty		151.4		69.2		82.2		118.8	%

	$	760.3	$	570.5	$	189.8		33.3	%

Net premiums written increased by $178.6 million, or 31.4%, consistent with the increase in gross premiums written.

Net premiums earned increased by $184.8 million, or 33.3%, as a result of the increase in net premiums written during the years ended December 31, 2012 and 2011. Premiums related to our reinsurance business earn at a slower rate than those related to our direct insurance business. Direct insurance premiums typically earn ratably over the term of a policy. Reinsurance premiums under a quota share reinsurance contract are typically earned over the same period as the underlying policies, or risks, covered by the contract. As a result, the earning pattern of a quota share reinsurance contract may extend up to 24 months, reflecting the inception dates of the underlying policies. Property catastrophe premiums and premiums for other treaties written on a losses occurring basis generally earn ratably over the term of the reinsurance contract.

Net losses and loss expenses. Net losses and loss expenses increased by $145.5 million, or 39.8%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The loss and loss expense ratio increased by 3.2 percentage points for the same period. The increase in net losses and loss expenses was due to growth in net premiums earned, lower prior year net favorable reserve development for the year ended December 31, 2012 compared to 2011 and $36.4 million of crop reinsurance-related losses recorded in 2012. This was partially offset by the lower property catastrophe losses in 2012 compared to 2011.

During the year ended December 31, 2012, we incurred $81.0 million of catastrophe-related losses for Superstorm Sandy. During the year ended December 31, 2011, we incurred $176.3 million, of which $51.5 million related to the Tohoku earthquake and tsunami, $45.9 million from the New Zealand earthquake, $32.2 million related to the Midwestern U.S. storms, $20.2 million related to the Thailand floods, $11.2 million related to Hurricane Irene and $15.3 million related to the Australian storms.

Excluding the prior year reserve development and property catastrophe losses, the loss and loss expense ratios would have been 62.2% and 54.2% for the years ended December 31, 2012 and 2011, respectively. The increase was primarily due to the $36.4 million in crop reinsurance losses and $15.3 million in other U.S. weather related losses for the year ended December 31, 2012 that increased the loss and loss expense ratio by 7.0 percentage points.


	Year Ended						Year Ended									Change in
	December 31, 2012						December 31, 2011						Dollar			Percentage
	Amount			% of NPE			Amount			% of NPE			Change			Points
	($ in millions)
Non-catastrophe	$	460.4			62.2	%	$	301.0			54.2	%	$	159.4			8.0Pts
Property catastrophe		81.0			10.9			176.3			31.7			(95.3	)		(20.8	)

Current year		541.4			73.1			477.3			85.9			64.1			(12.8	)
Prior year		(30.4	)		(4.1	)		(111.8	)		(20.1	)		81.4			16.0

Net losses and loss expenses	$	511.0			69.0	%	$	365.5			65.8	%	$	145.5			3.2	Pts

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Overall, our reinsurance segment recorded net favorable reserve development of $30.4 million during the year ended December 31, 2012 compared to net favorable reserve development of $111.8 million for the year ended December 31, 2011, as shown in the tables below.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2012
	2002			2003			2004			2005			2006			2007			2008			2009			2010			2011			Total
	($ in millions)
Specialty	$	(0.2	)	$	(0.4	)	$	(3.4	)	$	(5.5	)	$	(2.7	)	$	(4.8	)	$	(1.9	)	$	0.3		$	1.6		$	(3.5	)	$	(20.5	)
Property		—			(0.1	)		(0.7	)		1.5			—			(2.5	)		(1.8	)		(0.4	)		(2.3	)		(3.8	)		(10.1	)
Casualty		(0.1	)		0.4			3.6			2.0			(5.3	)		(12.6	)		(3.5	)		0.1			6.2			9.4			0.2

	$	(0.3	)	$	(0.1	)	$	(0.5	)	$	(2.0	)	$	(8.0	)	$	(19.9	)	$	(7.2	)	$	—		$	5.5		$	2.1		$	(30.4	)


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2011
	2002			2003			2004			2005			2006			2007			2008			2009			2010			Total
	($ in millions)
Specialty	$	—		$	(0.1	)	$	(2.8	)	$	(1.9	)	$	—		$	(0.9	)	$	(0.2	)	$	(5.7	)	$	(4.0	)	$	(15.6	)
Property		(0.2	)		(0.9	)		(1.1	)		(2.7	)		(1.2	)		(4.2	)		(0.3	)		(4.8	)		(11.3	)		(26.7	)
Casualty		(0.2	)		(1.5	)		(7.0	)		(31.0	)		(14.8	)		(15.6	)		(1.8	)		(0.3	)		2.7			(69.5	)

	$	(0.4	)	$	(2.5	)	$	(10.9	)	$	(35.6	)	$	(16.0	)	$	(20.7	)	$	(2.3	)	$	(10.8	)	$	(12.6	)	$	(111.8	)

Acquisition costs. Acquisition costs increased by $24.4 million, or 25.7%, for the year ended December 31, 2012 compared to the year ended December 31, 2011 primarily due to the increase in net premiums earned. The acquisition cost ratio was 16.1% for the year ended December 31, 2012, compared to 17.1% for the year ended December 31, 2011, primarily due to the change in mix of business.

General and administrative expenses. General and administrative expenses increased by $10.8 million, or 17.2%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. The increase was due to higher salary and related costs due to higher headcount to support our growing operations, combined with higher incentive compensation due to increased profitability and our higher stock price. The general and administrative expense ratios for the years ended December 31, 2012 and 2011 were 10.0% and 11.3%, respectively, reflecting the higher growth in net premiums earned relative to expenses in 2012.

Comparison of Years Ended December 31, 2011 and 2010

Premiums. Gross premiums written increased by $46.3 million, or 8.8%, for the year ended December 31, 2011 compared to 2010. The increase in gross premiums written was primarily due to increased writings in our international reinsurance lines of business with the continuing build out of our London and Singapore offices, including business written through Syndicate 2232, as well as $25.4 million of new business from our new global marine and specialty division. This growth was partially offset by the non-renewal of business that did not meet our underwriting requirements (which included inadequate pricing and/or terms and conditions). In addition, the increase in gross premiums written was partially offset by a two year treaty we wrote in our general casualty reinsurance line of business for $31.4 million in the year ended December 31, 2010.

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The table below illustrates our gross premiums written by underwriter geographic location for our reinsurance operations.


	Year Ended December 31,				Dollar			Percentage
	2011		2010		Change			Change
	($ in millions)
United States	$	241.6	$	264.2	$	(22.6	)		(8.6	%)
Bermuda		204.7		210.1		(5.4	)		(2.6	%)
Singapore		66.6		16.6		50.0			301.2	%
Europe		57.6		33.3		24.3			73.0	%

	$	570.5	$	524.2	$	46.3			8.8	%

The table below illustrates our gross premiums written by line of business for each of the periods indicated.


	Year Ended December 31,				Dollar			Percentage
	2011		2010		Change			Change
	($ in millions)
Property	$	266.9	$	181.0	$	85.9			47.5	%
Casualty		234.4		301.3		(66.9	)		(22.2	%)
Specialty		69.2		41.9		27.3			65.2	%

	$	570.5	$	524.2	$	46.3			8.8	%

Net premiums written increased by $47.2 million, or 9.0%, and net premiums earned increased $53.4 million, or 10.6%, consistent with the increase in gross premiums written.

Net losses and loss expenses. Net losses and loss expenses increased by $115.3 million, or 46.1%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The loss and loss expense ratio increased by 16.0 percentage points for the same period. The increase in net losses and loss expenses was due to growth in net premiums earned and increased property catastrophe losses, partially offset by higher favorable net prior year reserve development in 2011 compared to 2010.

During the year ended December 31, 2011, we incurred $176.3 million of catastrophe-related losses, of which 51.5 million related to the Tohoku earthquake and tsunami, $45.9 million from the New Zealand earthquake, $32.2 million related to the Midwestern U.S. storms, $20.2 million related to the Thailand floods, $11.2 million related to Hurricane Irene and $15.3 million related to the Australian storms. During the year ended December 31, 2010, we incurred $34.3 million of catastrophe-related losses from a number of earthquakes and other weather related events.

Excluding the prior year reserve development and property catastrophe losses, the loss and loss expense ratios would have been 54.2% and 55.8% for the years ended December 31, 2011 and 2010, respectively.


	Year Ended						Year Ended									Change in
	December 31, 2011						December 31, 2010						Dollar			Percentage
	Amount			% of NPE			Amount			% of NPE			Change			Points
	($ in millions)
Non-catastrophe	$	301.0			54.2	%	$	280.1			55.8	%	$	20.9			(1.6	)	Pts
Property catastrophe		176.3			31.7			34.3			6.8			142.0			24.9

Current year		477.3			85.9			314.4			62.6			162.9			23.3
Prior year		(111.8	)		(20.1	)		(64.2	)		(12.8	)		(47.6	)		(7.3	)

Net losses and loss expenses	$	365.5			65.8	%	$	250.2			49.8	%	$	115.3			16.0		Pts

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Overall, our reinsurance segment recorded net favorable reserve development of $111.8 million and $64.2 million during the years ended December 31, 2011 and 2010, respectively, as shown in the tables below.


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2011
	2002			2003			2004			2005			2006			2007			2008			2009			2010			Total
	($ in millions)
Specialty	$	—		$	(0.1	)	$	(2.8	)	$	(1.9	)	$	—		$	(0.9	)	$	(0.2	)	$	(5.7	)	$	(4.0	)	$	(15.6	)
Property		(0.2	)		(0.9	)		(1.1	)		(2.7	)		(1.2	)		(4.2	)		(0.3	)		(4.8	)		(11.3	)		(26.7	)
Casualty		(0.2	)		(1.5	)		(7.0	)		(31.0	)		(14.8	)		(15.6	)		(1.8	)		(0.3	)		2.7			(69.5	)

	$	(0.4	)	$	(2.5	)	$	(10.9	)	$	(35.6	)	$	(16.0	)	$	(20.7	)	$	(2.3	)	$	(10.8	)	$	(12.6	)	$	(111.8	)


	(Favorable) and Unfavorable Loss Reserve Development by Loss Year
	For the Year Ended December 31, 2010
	2002			2003			2004			2005			2006			2007			2008			2009			Total
	($ in millions)
Specialty	$	—		$	(0.4	)	$	(1.1	)	$	(0.5	)	$	—		$	(1.2	)	$	(2.6	)	$	—		$	(5.8	)
Property		(0.3	)		(0.7	)		(1.0	)		(3.6	)		(0.7	)		(3.5	)		0.8			(7.7	)		(16.7	)
Casualty		(0.5	)					(7.8	)		(28.9	)		(11.7	)		0.9			4.9			1.4			(41.7	)

	$	(0.8	)	$	(1.1	)	$	(9.9	)	$	(33.0	)	$	(12.4	)	$	(3.8	)	$	3.1		$	(6.3	)	$	(64.2	)

Acquisition costs. Acquisition costs increased by $3.0 million, or 3.3%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The increase was primarily a result of higher net premiums earned partially offset by a decrease in profit commissions due to loss activity. The acquisition cost ratio was 17.1% for the year ended December 31, 2011, slightly lower than the 18.3% for the year ended December 31, 2010. The decrease in the acquisition cost ratio is due to more business written on an excess-of-loss basis, which typically carries a lower acquisition cost ratio than quota share business.

General and administrative expenses. General and administrative expenses decreased $0.9 million, or 1.4%, for the year ended December 31, 2011 compared to the year ended December 31, 2010. The decrease in general and administrative expenses was primarily due to a decrease in performance based incentive compensation expenses partially offset by additional professional fees related to the operation of the Lloyd’s Syndicate which was operational for only six months in the prior year. The general and administrative expense ratios for the years ended December 31, 2011 and 2010 were 11.3% and 12.7%, respectively, due to lower general and administrative expenses and higher net premiums earned.

Liquidity and Capital Resources

Liquidity

Liquidity is a measure of our ability to access sufficient cash flows to meet the short-term and long-term cash requirements of our business operations. The Company believes that its cash flows from operations and investments will provide sufficient liquidity for the foreseeable future.

Holdings is a holding company and transacts no business of its own. Cash flows to Holdings may comprise dividends, advances and loans from its subsidiary companies. Holdings is therefore reliant on receiving dividends and other permitted distributions from its subsidiaries to make dividend payments on its common shares.

Our operating subsidiaries depend upon cash inflows from premium receipts, net of commissions, investment income and proceeds from sales and redemptions of investments. Cash outflows for our operating subsidiaries are in the form of claims payments, reinsurance premium payments, purchase of investments, operating expenses and income tax payments as well as dividend payments to the holding company.

Historically, our operating subsidiaries have generated sufficient cash flows to meet all of their obligations. Because of the inherent volatility of our business, the seasonality in the timing of payments by insureds and

109

cedents, the irregular timing of loss payments, and the impact of a change in interest rates and credit spreads on the investment income as well as seasonality in coupon payment dates for fixed income securities, cash flows from operating activities may vary between periods. In the unlikely event that paid losses exceed operating cash flows in any given period, we would use our cash balances available, liquidate a portion of our investment portfolio or borrow under our revolving loan facility (see “Credit Facility” below) in order to meet our short-term liquidity needs.

Our total investments and cash totaled $8.8 billion as of December 31, 2012, the main components of which were investment grade fixed income securities and cash and cash equivalents. As of December 31, 2012, we held $681.9 million of cash and cash equivalents and $573.9 million of fixed income securities with a maturity of less than one year to meet short-term liquidity needs. Our remaining fixed income securities, equity securities and other invested assets are available to meet our long-term liquidity needs.

As of December 31, 2012, we had $150 million available under our revolving loan facility.

Dividend Restrictions

Allied World Assurance Company, AG is subject to Swiss financial and regulatory restrictions limiting its ability to declare and pay dividends. In addition, the jurisdictions in which our operating subsidiaries are licensed to write business also impose regulations requiring companies to maintain or meet various defined statutory ratios, including solvency and liquidity requirements. Some jurisdictions also place restrictions on the declaration and payment of dividends and other distributions.

The payment of dividends from Holdings’ Bermuda domiciled operating subsidiary is, under certain circumstances, limited under Bermuda law, which requires our Bermuda operating subsidiary to maintain certain measures of solvency and liquidity.

Holdings’ U.S. domiciled operating subsidiaries are subject to significant regulatory restrictions limiting their ability to declare and pay dividends. In particular, payments of dividends by Allied World Assurance Company (U.S.) Inc., Allied World National Assurance Company, Allied World Insurance Company, Darwin National Assurance Company, Darwin Select Insurance Company and Vantapro Specialty Insurance Company are subject to restrictions on statutory surplus pursuant to the respective states in which these insurance companies are domiciled. Each state requires prior regulatory approval of any payment of extraordinary dividends.

Allied World Assurance Company (Europe) Limited and Allied World Assurance Company (Reinsurance) Limited are subject to regulatory restrictions limiting their ability to declare and pay any dividends without the consent of the Central Bank of Ireland. We also have branch operations in Canada, Hong Kong, Labuan and Singapore, which have regulatory restrictions limiting the ability to declare and pay dividends.

We also have insurance subsidiaries that are the parent company for other insurance subsidiaries, which means that dividends and other distributions will be subject to multiple layers of regulations in order to dividend funds to Holdings. The inability of the subsidiaries of Holdings to pay dividends and other permitted distributions could have a material adverse effect on Holdings’ cash requirements and our ability to make principal, interest and dividend payments on the senior notes and common shares.

Cash Flows


	Year Ended December 31,
	2012			2011			2010
	($ in millions)
Cash flows provided by operating activities	$	629.4		$	548.1			451.3
Cash flows used in investing activities		(259.7	)		(509.1	)		500.0
Cash flows used in financing activities		(321.2	)		(162.1	)		(486.1	)
Effect of exchange rate changes on foreign currency cash		(0.6	)		0.1			(0.4	)

Net increase (decrease) in cash and cash equivalents		47.9			(123.0	)		464.8
Cash and cash equivalents, beginning of year		634.0			757.0			292.2

Cash and cash equivalents, end of year	$	681.9		$	634.0		$	757.0

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The primary sources of cash inflows from operating activities are premiums received, loss payments from reinsurers and investment income. The primary sources of cash outflows from operating activities are ceded premiums paid to reinsurers, claims paid, commissions paid, operating expenses, interest expense and income taxes. The primary factor in our ability to generate positive operating cash flow is underwriting profitability. We have generated positive operating cash flow for more than 10 consecutive years.

The $81.3 million increase in cash flows from operations was due to the higher premiums collected, net of reinsurance, as net premiums written increased by $304.0 million. This was partially offset by the $176.2 million increase in net paid losses as a result of the growth in operations, the settlement of 2011 catastrophe losses and the maturation of our inforce business.

In our casualty lines of business, claims may be reported and settled several years after the coverage period has terminated. As a result, we expect that we will generate significant operating cash flow as we accumulate casualty loss reserves on our balance sheet. In our property lines of business, claims are generally reported and paid within a relatively short period of time and we expect volatility in our operating cash flows as losses are incurred. Our net paid losses may increase in the short-term due to the recent natural catastrophe activity. We expect increases in the amount of expected loss payments in future periods with a resulting decrease in operating cash flow; however, we do not expect loss payments to exceed the premiums generated. Actual premiums written and collected and losses and loss expenses paid in any period could vary materially from our expectations and could have a significant and adverse effect on operating cash flow.

Cash flows used in investing activities consist primarily of payments for investments acquired, proceeds on the sale of investments and changes in restricted cash. Cash flows used in investing activities decreased $249.4 million from $509.1 million for the year ended December 31, 2011 to $259.7 million for the year ended December 31, 2012. The decrease was to finance our increased share repurchases and dividend payments in 2012.

Cash flows used in financing activities consist primarily of capital raising activities, which include the issuance of common shares or debt, the repurchase of our shares, the payment of dividends and the repayment of debt. The $159.1 million increase in cash flows used in financing activities was due to the $177.2 million increase in share repurchases. No shares were repurchased in the nine months ended September 30, 2011 because of the merger negotiations with Transatlantic. This was partially offset by the $53.6 million in founder warrants repurchased in February 2011. The increase in cash flows used in financing activities was also due to the $39.2 million increase in dividends paid for the year ended December 31, 2012 compared to 2011. Under Swiss Law, we were not able to pay our quarterly dividend until two months after our annual general meeting, resulting in fewer dividend payments in 2011.

Investments

Our funds are primarily invested in liquid, high-grade fixed income securities. As of December 31, 2012 and 2011, 89.2% and 92.6%, respectively, of our fixed income portfolio consisted of investment grade securities. The maturity distribution of our fixed income portfolio (on a fair value basis) as of December 31, 2012 and 2011 was as follows:


	As of December 31,
	2012		2011
	($ in millions)
Due in one year or less	$	573.9	$	661.6
Due after one year through five years		2,835.9		2,686.1
Due after five years through ten years		774.4		725.5
Due after ten years		73.0		94.2
Mortgage-backed		1,958.4		1,818.1
Asset-backed		410.9		513.2

Total	$	6,626.5	$	6,498.7

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We have investments in other invested assets, comprising interests in hedge funds and private equity funds, the market value of which was $783.5 million as of December 31, 2012. Some of these funds have redemption notice requirements. For each of our funds, liquidity is allowed after certain defined periods based on the terms of each fund. See Note 3(c) “Investments — Other Invested Assets” to our consolidated financial statements for additional details on our other invested assets.

We do not believe that inflation has had a material effect on our consolidated results of operations. The potential exists, after a catastrophe loss, for the development of inflationary pressures in a local economy. The effects of inflation are considered implicitly in pricing. Loss reserves are established to recognize likely loss settlements at the date payment is made. Those reserves inherently recognize the effects of inflation. The actual effects of inflation on our results cannot be accurately known, however, until claims are ultimately resolved.

Pledged Assets

Allied World Assurance Company, Ltd uses trust accounts primarily to meet security requirements for inter-company and certain reinsurance transactions. We also have cash and cash equivalents and investments on deposit with various state or government insurance departments or pledged in favor of ceding companies in order to comply with reinsurance contract provisions and relevant insurance regulations. In addition, Allied World Assurance Company, Ltd currently has access to up to $1.45 billion in letters of credit under two letter of credit facilities, a $1 billion uncommitted facility with Citibank Europe plc and a $450 million committed Amended Secured Credit Facility. These facilities are used to provide security to reinsureds and are collateralized by us, at least to the extent of letters of credit outstanding at any given time.

Security arrangements with ceding insurers may subject our assets to security interests or require that a portion of our assets be pledged to, or otherwise held by, third parties. Both of our letter of credit facilities are fully collateralized by assets held in custodial accounts at the Bank of New York Mellon held for the benefit of the banks. Although the investment income derived from our assets while held in trust accrues to our benefit, the investment of these assets is governed by the terms of the letter of credit facilities or the investment regulations of the state or territory of domicile of the ceding insurer, which may be more restrictive than the investment regulations otherwise applicable to us. The restrictions may result in lower investment yields on these assets, which may adversely affect our profitability.

As of December 31, 2012 and 2011, $2,141.2 million and $2,029.1 million, respectively, of cash and cash equivalents and investments were deposited, pledged or held in escrow accounts in favor of ceding companies and other counterparties or government authorities to comply with reinsurance contract provisions and insurance laws.

In addition, as of December 31, 2012 and 2011, a further $1,225.2 million and $1,044.2 million, respectively, of cash and cash equivalents and investments were pledged as collateral for our credit facilities.

We do not currently anticipate that the restrictions on liquidity resulting from restrictions on the payment of dividends by our subsidiary companies or from assets committed in trust accounts or to collateralize the letter of credit facilities will have a material impact on our ability to carry out our normal business activities, including interest and dividend payments, respectively, on our senior notes (described below) and common shares.

Financial Strength Ratings

Financial strength ratings represent the opinions of rating agencies on our capacity to meet our obligations. In the event of a significant downgrade in ratings, our ability to write business and to access the capital markets could be impacted. For additional information on our financial strength ratings refer to “Our Financial Strength Ratings” in Item 1 “Business”.

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Capital Resources

The table below sets forth the capital structure of the Company as of December 31, 2012 and 2011:


	As of December 31,
	2012			2011
	($ in millions)
Senior notes	$	798.2		$	798.0
Shareholders’ equity		3,326.3			3,149.0

Total capitalization	$	4,124.5		$	3,947.0

Debt to total capitalization		19.4	%		20.2	%

On September 10, 2012, we filed a shelf registration statement on Form S-3 with the U.S. Securities and Exchange Commission in which we may offer from time to time common shares of Allied World Switzerland, senior or subordinated debt securities of Allied World Bermuda, guarantees of debt securities of Allied World Bermuda, warrants to purchase common shares of Allied World Switzerland, warrants to purchase debt securities of Allied World Bermuda units which may consist of any combination of the securities listed above. The registration statement is intended to provide us with additional flexibility to access capital markets for general corporate purposes, subject to market conditions and our capital needs.

Share Repurchases

In May 2012, we established a new $500 million share repurchase program. Under the terms of this new share repurchase program, common shares repurchased shall be designated for cancellation and shall be cancelled upon prior shareholder approval.

During the year ended December 31, 2012, our share repurchases were as follows:


	Year Ended December 31, 2012
Common shares repurchased		3,655,959
Total cost of shares repurchased	$	263,942
Average price per share	$	72.20

Shares repurchased by the Company and not designated for cancellation are classified as “Treasury shares, at cost” on the consolidated balance sheets. The Company will issue shares out of treasury principally related to the Company’s employee benefit plans. Shares repurchased and designated for cancellation are constructively retired and recorded as a share cancellation.

Long-Term Debt

In July 2006, Allied World Bermuda issued $500 million aggregate principal amount of 7.50% senior notes due August 1, 2016, with interest payable August 1 and February 1 each year. Allied World Bermuda can redeem the senior notes prior to maturity, subject to payment of a “make-whole” premium; however, Allied World Bermuda currently has no intention of redeeming the notes.

In November 2010, Allied World Bermuda issued $300 million aggregate principal amount of 5.50% senior notes due November 1, 2020, with interest payable May 15 and November 15 each year, commencing May 15, 2011. Allied World Bermuda can redeem the senior notes prior to maturity, subject to payment of a “make-whole” premium; however, Allied World Bermuda currently has no intention of redeeming the notes.

The senior notes issued in 2006 and 2010 have been unconditionally and irrevocably guaranteed for the payment of the principal and interest by Holdings.

Credit Facility

In the normal course of our operations, we enter into agreements with financial institutions to obtain secured and unsecured credit facilities.

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On June 7, 2012, Allied World Bermuda amended its existing secured credit facility. The amended $450 million four-year secured credit facility (the “Amended Secured Credit Facility”) is with a syndication of lenders and is primarily for the issuance of standby letters of credit to support obligations in connection with the insurance and reinsurance business of Allied World Bermuda and its subsidiaries. A portion of the facility may also be used for revolving loans for general corporate and working capital purposes, up to a maximum of $150 million. Allied World Bermuda may request that existing lenders under the Amended Secured Credit Facility make additional commitments from time to time, up to $150 million, subject to approval by the lenders. The Amended Secured Credit Facility contains representations, warranties and covenants customary for similar bank loan facilities, including certain covenants that, among other things, require us to maintain a certain leverage ratio and financial strength rating. We are in compliance with all covenants under the Amended Secured Credit Facility as of December 31, 2012.

On June 7, 2012, upon entering into the Amended Secured Credit Facility, Allied World Bermuda terminated its $400 million unsecured credit facility.

As of December 31, 2012, we also have access to a $1 billion uncommitted letter of credit facility with Citibank Europe plc. This facility was increased from $900 million as of December 31, 2011. The letters of credit issued under the credit facility with Citibank Europe plc are deemed to be automatically extended without amendment for twelve months from the expiry date, or any future expiration date unless at least 30 days prior to any expiration date Citibank Europe plc notifies us that they elect not to consider the letters of credit renewed for any such additional period.

As of December 31, 2012, we had a combined unused letters of credit capacity of $433.6 million from the Amended Secured Credit Facility and Citibank Europe plc. We believe that this remaining capacity is sufficient to meet our future letter of credit needs.

Aggregate Contractual Obligations

The following table shows our aggregate contractual obligations by time period remaining until due date as of December 31, 2012:


	Payment Due by Period
	Total		Less Than 1 Year		1-3 Years		3-5 Years		More Than 5 Years
	($ in millions)
Contractual Obligations
Senior notes (including interest)	$	1,119.5	$	54.0	$	108.0	$	608.0	$	349.5
Operating lease obligations		65.9		11.2		19.2		15.4		20.1
Investment commitments outstanding		266.4		1.1		—		35.6		229.7
Real estate purchase commitment		42.0		5.5		36.5		—		—
Reinsurance collateral		700.0		300.0		400.0		—		—
Gross reserve for losses and loss expenses(1)		5,645.5		1,206.6		1,572.4		869.8		1,996.7

Total	$	7,839.3	$	1,578.4	$	2,136.1	$	1,528.8	$	2,596.0

(1)

Our unpaid losses and loss expenses represent our best estimate of the cost to settle the ultimate liabilities based on information available as of December 31, 2012, and are not fixed amounts payable pursuant to contractual commitments. The timing and amounts of actual loss payments related to these reserves might vary significantly from our current estimate of the expected timing and amounts of loss payments based on many factors, including large individual losses as well as general market conditions.

The investment commitments outstanding represent unfunded commitments related to our other invested assets.

The amounts included for reserve for losses and loss expenses reflect the estimated timing of expected loss payments on known claims and anticipated future claims as of December 31, 2012 and do not take reinsurance recoverables into account. Both the amount and timing of cash flows are uncertain and do not have contractual

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payout terms. For a discussion of these uncertainties, refer to “— Critical Accounting Policies — Reserve for Losses and Loss Expenses.” Due to the inherent uncertainty in the process of estimating the timing of these payments, there is a risk that the amounts paid in any period will differ significantly from those disclosed. Total estimated obligations will be funded by existing cash and investments.

Off-Balance Sheet Arrangements

As of December 31, 2012, we did not have any off-balance sheet arrangements.

Item 7A.

Quantitative and Qualitative Disclosures About Market Risk.

We believe that we are principally exposed to three types of market risk: interest rate risk, credit risk and currency risk.

The fixed income securities in our investment portfolio are subject to interest rate risk and credit risk. Any changes in interest rates and credit spreads have a direct effect on the market values of fixed income securities. As interest rates rise, the market values fall, and vice versa. As credit spreads widen, the market values fall, and vice versa.

In the table below changes in market values as a result of changes in interest rates is determined by calculating hypothetical December 31, 2012 ending prices based on yields adjusted to reflect the hypothetical changes in interest rates, comparing such hypothetical ending prices to actual ending prices, and multiplying the difference by the principal amount of the security. The sensitivity analysis is based on estimates. The estimated changes of our fixed maturity investments and cash and cash equivalents are presented below and actual changes for interest rate shifts could differ significantly.


	Interest Rate Shift in Basis Points
	-200			-100			-50			—			+50			+100			+200
	($ in millions)
Total market value	$	7,653.6		$	7,595.3		$	7,553.4		$	7,491.8		$	7,419.2		$	7,340.9		$	7,173.4
Market value change from base		161.8			103.5			61.6			—			(72.6	)		(150.9	)		(318.4	)
Change in unrealized appreciation/(depreciation)		2.2	%		1.4	%		0.8	%		0	%		(1.0	%)		(2.0	%)		(4.3	%)

In the table below changes in market values as a result of changes in credit spreads are determined by calculating hypothetical December 31, 2012 ending prices adjusted to reflect the hypothetical changes in credit spreads, comparing such hypothetical ending prices to actual ending prices, and multiplying the difference by the principal amount of the security. The sensitivity analysis is based on estimates. The estimated changes of our non-cash, non-U.S. Treasury fixed maturity investments are presented below and actual changes in credit spreads could differ significantly.


	Credit Spread Shift in Basis Points
	-200			-100			-50			—			+50			+100			+200
	($ in millions)
Total market value	$	5,352.9		$	5,225.1		$	5,161.2		$	5,097.3		$	5,033.4		$	4,969.5		$	4,841.6
Market value change from base		255.6			127.8			63.9			—			(63.9	)		(127.8	)		(255.7	)
Change in unrealized appreciation/(depreciation)		5.0	%		2.5	%		1.3	%		0	%		(1.3	%)		(2.5	%)		(5.0	%)

In addition to credit spread risk, our portfolio is also exposed to the risk of securities being downgraded or of issuers defaulting. In an effort to minimize this risk, our investment guidelines have been defined to ensure that the assets held are well diversified and are primarily high-quality securities.

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The following table shows the types of securities in our portfolio, their fair market values, average rating and portfolio percentage as of December 31, 2012.


	Fair Value December 31, 2012		Average Rating		Portfolio Percentage
	($ in millions)
Cash and cash equivalents	$	865.4		AAA		9.8	%
U.S. government securities		1,529.2		AA+		17.3	%
U.S. government agencies		336.8		AA+		3.8	%
Non-U.S. government and government agencies		261.6		AA+		3.0	%
State, municipalities and political subdivisions		40.4		AA-		0.5	%
Mortgage-backed securities (“MBS”): Agency MBS		1,400.9		AA+		15.9	%
Non-agency Residential MBS		90.3		BBB+		1.0	%
Non-agency MBS — Non investment grade		176.8		CCC		2.0	%
Commercial MBS		290.4		AA+		3.4	%

Total mortgage-backed securities		1,958.4				22.3	%
Corporate securities:
Financials		866.1		A+		9.8	%
Industrials		1,153.9		BBB-		13.1	%
Utilities		69.2		BBB-		0.8	%

Total corporate securities		2,089.2				23.7	%
Asset-backed securities:
Credit cards		24.9		AAA		0.3	%
Auto receivables		31.3		AAA		0.4	%
Student Loans		133.0		AA+		1.5	%
Collateralized loan obligations		190.2		AA+		2.2	%
Other		31.5		AAA		0.3	%

Total asset-backed securities		410.9				4.7	%
Other invested assets:
Private equity		151.0		N/A		1.7	%
Hedge funds		504.9		N/A		5.7	%
Other private securities		127.6		N/A		1.5	%

Total other invested assets		783.5				8.9	%
Equities		523.9		N/A		6.0	%

Total investment portfolio	$	8,799.3				100.0	%

As of December 31, 2012, we held $6.6 billion of fixed income securities. Of those assets, approximately 89.2% were rated investment grade (Baa3/BBB—or higher) with the remaining 10.8% rated in the below investment grade category. The average credit quality of the fixed maturity portfolios was AA—by Standard & Poor’s.

Our agency pass-through mortgage-backed securities are exposed to prepayment risk, which occurs when holders of individual mortgages increase the frequency with which they prepay the outstanding principal before

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the maturity date to refinance at a lower interest rate cost. Given the proportion that these securities comprise of the overall portfolio, and the current interest rate environment and condition of the credit market, prepayment risk is not considered significant at this time.

Our non-agency commercial mortgage-backed securities are subject to the risk of non-payment due to increased levels of delinquencies, defaults and losses on commercial loans that cumulatively create shortfalls beyond the level of subordination in our specific securities. As of December 31, 2012, 34.5% of our non-agency commercial mortgage-backed securities were rated below Aaa/AAA.

As of December 31, 2012, we held investments in other invested assets with a fair value of $783.5 million. Other invested assets consist primarily of investments in hedge funds and private equity funds. Investments in these funds involve certain risks related to, among other things, the illiquid nature of the fund shares, the limited operating history of the fund, as well as risks associated with the strategies employed by the managers of the funds. The funds’ objectives are generally to seek attractive long-term returns with lower volatility by investing in a range of diversified investment strategies. As our reserves and capital continue to build, we may consider additional investments in these or other alternative investments. In addition, we invest in various strategic business opportunities that diversify our earnings stream, including asset management and claims servicing.

During 2011, concerns about sovereign and corporate credits throughout the European Economic Area became elevated. As of December 31, 2012, our direct exposure to European credit across all of Europe was $662.2 million and is included within “fixed maturity investments trading, at fair value” and “equity securities trading, at fair value” in the consolidated balance sheets. Of that, approximately $216.2 million was invested in debt issued or guaranteed by European nations, $29.0 million was invested in structured products and $417.0 million was invested in debt and equity securities of European corporations (not guaranteed by a sovereign nation) as outlined in the table below. As of December 31, 2012, we had no direct sovereign exposure to Greece, Ireland, Italy, Portugal or Spain.


	December 31, 2012
	Sovereign and Sovereign Guaranteed		Structured Products		Corporate Bonds and Equities		Total Exposure
	($ in millions)
Belgium	$	22.0	$	—	$	19.1	$	41.1
Denmark		34.7		—		—		34.7
France		—		5.6		54.3		59.9
Germany		71.5		2.7		17.8		92.0
Ireland		—		1.7		2.8		4.5
Italy		—		—		3.1		3.1
Luxembourg		—		—		19.3		19.3
Netherlands		38.8		—		49.8		88.6
Norway		6.9		—		31.4		38.3
Russia		—		—		12.2		12.2
Spain		—		—		24.9		24.9
Sweden		—		—		32.0		32.0
Switzerland		10.9		—		42.2		53.1
United Kingdom		31.4		19.0		108.1		158.5

Total exposure	$	216.2	$	29.0	$	417.0	$	662.2

The U.S. dollar is our reporting currency and the functional currency of all of our operating subsidiaries. However, we enter into insurance and reinsurance contracts where the premiums receivable and losses payable are denominated in currencies other than the U.S. dollar. In addition, we maintain a portion of our investments and liabilities in currencies other than the U.S. dollar, primarily Euro, British Sterling, Swiss Franc and the Canadian dollar. Receivables in non-U.S. currencies are generally converted into U.S. dollars at the time of receipt. When we incur a liability in a non-U.S. currency, we carry such liability on our books in the original

117

currency. These liabilities are converted from the non-U.S. currency to U.S. dollars at the time of payment. As a result, we have an exposure to foreign currency risk resulting from fluctuations in exchange rates. We utilize a hedging strategy to minimize the potential loss of value caused by currency fluctuations by using foreign currency forward contract derivatives that expire in 90 days from purchase.

As of December 31, 2012 and 2011, less than 3.4% and 3.1%, respectively, of our total investments and cash and cash equivalents were denominated in currencies other than the U.S. dollar. Of our business written during the years ended December 31, 2012 and 2011, approximately 12% was written in currencies other than the U.S. dollar.

Item 8.

Financial Statements and Supplementary Data.

See our consolidated financial statements and notes thereto and required financial statement schedules commencing on pages F-1 through F-58 and S-1 through S-2 below.

Item 9.

Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.

None.

Item 9A.

Controls and Procedures.

Disclosure Controls and Procedures

In connection with the preparation of this report, our management has performed an evaluation, with the participation of our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act) as of December 31, 2012. Disclosure controls and procedures are designed to ensure that information required to be disclosed in reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the time periods specified by SEC rules and forms and that such information is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, to allow for timely decisions regarding required disclosures. Based on their evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, as of December 31, 2012, our company’s disclosure controls and procedures were effective to ensure that information required to be disclosed in our reports filed under the Exchange Act is recorded, processed, summarized and reported within the time periods specified by SEC rules and forms and accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Management’s Annual Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f). Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2012, based on the framework in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). Based on an evaluation under the framework in Internal Control — Integrated Framework issued by COSO, our management concluded that our internal control over financial reporting was effective as of December 31, 2012.

Our management, including the Chief Executive Officer and Chief Financial Officer, does not expect that our disclosure controls and procedures or our internal control over financial reporting will prevent all error and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide an absolute assurance that all control issues and instances of fraud, if any, within our company have been detected.

118

The effectiveness of internal control over financial reporting as of December 31, 2012 has been audited by Deloitte & Touche Ltd., an independent registered public accounting firm, as stated in their report which is included below.

Changes in Internal Control Over Financial Reporting

No changes were made in our internal controls over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f), during the fourth quarter ended December 31, 2012 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders of

Allied World Assurance Company Holdings, AG

Zug, Switzerland

We have audited the internal control over financial reporting of Allied World Assurance Company Holdings, AG and subsidiaries (the “Company”) as of December 31, 2012, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Annual Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed by, or under the supervision of, the company’s principal executive and principal financial officers, or persons performing similar functions, and effected by the company’s board of directors, management, and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of the inherent limitations of internal control over financial reporting, including the possibility of collusion or improper management override of controls, material misstatements due to error or fraud may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2012, based on the criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets and related consolidated statements of operations and comprehensive income, shareholders’ equity, and cash flows and financial statement schedules as of and for the year ended December 31, 2012 of the Company and our report dated February 25, 2013 expressed an unqualified opinion on those financial statements and financial statement schedules

/s/ Deloitte & Touche Ltd.

Hamilton, Bermuda

February 25, 2013

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Item 9B.

Other Information.

None.

PART III

Item 10.

Directors, Executive Officers and Corporate Governance.

The information required by this item is incorporated by reference from a definitive proxy statement that will be filed with the SEC not later than 120 days after the close of the fiscal year ended December 31, 2012 pursuant to Regulation 14A.

We have adopted a Code of Ethics for the Chief Executive Officer and Senior Financial Officers that applies specifically to such persons. The Code of Ethics for the Chief Executive Officer and Senior Financial Officers is available free of charge on our website at www.awac.com and is available in print to any shareholder who requests it. We intend to disclose any amendments to this code by posting such information on our website, as well as disclosing any waivers of this code applicable to our principal executive officer, principal financial officer, principal accounting officer or controller and other executive officers who perform similar functions through such means or by filing a Form 8-K.

Item 11.

Executive Compensation.

Item 12.

Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Item 13.

Certain Relationships and Related Transactions, and Director Independence.

Item 14.

Principal Accountant Fees and Services.

PART IV

Item 15.

Exhibits and Financial Statement Schedules.

Financial statement schedules listed in the accompanying index to our consolidated financial statements starting on page F-1 are filed as part of this Form 10-K, and are included in Item 8.

The exhibits listed in the accompanying exhibit index starting on page E-1 are filed as part of this Form 10-K.

121

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, in Zug, Switzerland on February 25, 2013.


ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

By:		/s/ Scott A. Carmilani
		Name: Scott A. Carmilani
		Title: President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.


Signature	Title	Date

/s/ Scott A. Carmilani	President, Chief Executive Officer and Chairman of the Board (Principal Executive Officer)	February 25, 2013
Scott A. Carmilani

/s/ Thomas A. Bradley	Executive Vice President and Chief Financial Officer (Principal Financial and Accounting Officer)	February 25, 2013
Thomas A. Bradley

/s/ Barbara T. Alexander	Director	February 25, 2013
Barbara T. Alexander

/s/ James F. Duffy	Director	February 25, 2013
James F. Duffy

/s/ Bart Friedman	Vice Chairman of the Board	February 25, 2013
Bart Friedman

/s/ Scott Hunter	Director	February 25, 2013
Scott Hunter

/s/ Patrick de Saint-Aignan	Director	February 25, 2013
Patrick de Saint-Aignan

/s/ Samuel J. Weinhoff	Director	February 25, 2013
Samuel J. Weinhoff

122

EXHIBIT INDEX


Exhibit Number		Description

3.1(1)		Articles of Association of Allied World Assurance Company Holdings, AG, as amended and restated

3.2(2)		Organizational Regulations of Allied World Assurance Company Holdings, AG, as amended and restated

4.1(3)		Specimen Common Share Certificate

4.2(4)		Indenture, dated as of July 26, 2006, by and between Allied World Assurance Company Holdings, Ltd, as issuer, and The Bank of New York, as trustee, with regard to Allied World Assurance Company Holdings, Ltd’s outstanding 7.50% Senior Notes due 2016

4.3(4)		First Supplemental Indenture, dated as of July 26, 2006, by and between Allied World Assurance Company, Ltd, as issuer, and The Bank of New York, as trustee, with regard to Allied World Assurance Company Holdings, Ltd’s outstanding 7.50% Senior Notes due 2016

4.4(5)		Second Supplemental Indenture, dated as of December 30, 2010, by and among Allied World Assurance Company Holdings, AG, Allied World Assurance Company Holdings, Ltd and The Bank of New York Mellon, as trustee, with regard to Allied World Assurance Company Holdings, Ltd’s outstanding 7.50% Senior Notes due 2016

4.5(4)		Form of 7.50% Senior Note (Included as part of Exhibit 4.3)

4.6(6)		Senior Indenture, dated November 15, 2010, by and between Allied World Assurance Company Holdings, Ltd and The Bank of New York Mellon, as trustee, with regard to Allied World Assurance Company Holdings, Ltd’s outstanding 5.50% Senior Notes due 2020

4.7(6)		First Supplemental Indenture, dated November 15, 2010, by and between Allied World Assurance Company Holdings, Ltd and The Bank of New York Mellon, as trustee, with regard to Allied World Assurance Company Holdings, Ltd’s outstanding 5.50% Senior Notes due 2020

4.8(5)		Second Supplemental Indenture, dated as of December 30, 2010, by and among Allied World Assurance Company Holdings, AG, Allied World Assurance Company Holdings, Ltd and The Bank of New York Mellon, as Trustee, with regard to Allied World Assurance Company Holdings, Ltd’s outstanding 5.50% Senior Notes due 2020

4.9(6)		Form of 5.50% Senior Note (Included as part of Exhibit 4.7)

10.1(7)		Insurance Letters of Credit-Master Agreement, dated February 28, 2007, by and among Allied World Assurance Company, Ltd, Citibank N.A. and Citibank Europe plc

10.2(7)		Pledge Agreement, dated as of February 28, 2007, by and between Allied World Assurance Company, Ltd and Citibank Europe plc

10.3(7)		Account Control Agreement, dated March 5, 2007, by and among Citibank Europe plc, as secured party; Allied World Assurance Company, Ltd, as pledgor; and Mellon Bank, N.A

10.4(8)		Letter Agreement, dated December 30, 2008, by and among Allied World Assurance Company, Ltd, Citibank Europe plc and The Bank of New York Mellon, with respect to the types of securities that may be pledged under the letter of credit facility with Citibank Europe plc

10.5		Letter and Summary of Terms, dated December 7, 2012, from Citibank Europe plc to Allied World Assurance Company, Ltd, with respect to the letter of credit facility with Citibank Europe plc

10.6(9)		Amended and Restated Credit Agreement, dated as of June 7, 2012, by and among Allied World Assurance Company Holdings, AG; Allied World Assurance Company Holdings, Ltd; Allied World Assurance Company, Ltd; the lenders a party thereto; Citibank, N.A., as syndication agent; and Wells Fargo Bank, National Association, as administrative agent, fronting bank and letter of credit agent.

E-1


Exhibit Number		Description

10.7(9)		Amended and Restated Pledge and Security Agreement, dated as of June 7, 2012, by and between Allied World Assurance Company, Ltd, as pledgor; and Wells Fargo Bank, National Association, as administrative agent

10.8(9)		Pledge and Security Agreement, dated as of June 7, 2012, by and between Allied World Assurance Company Holdings, Ltd, as pledgor; and Wells Fargo Bank, National Association, as administrative agent

10.9(9)		Amended and Restated Account Control Agreement, dated June 7, 2012, by and among Allied World Assurance Company, Ltd, as pledgor; The Bank of New York Mellon, as custodian; and Wells Fargo Bank, National Association, as administrative agent

10.10(9)		Account Control Agreement, dated June 7, 2012, by and among Allied World Assurance Company Holdings, Ltd, as pledgor; The Bank of New York Mellon, as custodian; and Wells Fargo Bank, National Association, as administrative agent

10.11(10)		Contribution-in-Kind Agreement, dated November 30, 2010

10.12(10)		Benefit Plan Assignment and Assumption Agreement, dated as of December 1, 2010, by and among Allied World Assurance Company Holdings, Ltd, Allied World Assurance Company, Ltd, Newmarket Administrative Services, Inc. n/k/a AWAC Services Company and Allied World Assurance Company Holdings, AG

10.13(10)†		Form of Indemnification Agreement for directors and executive officers of Allied World Assurance Company Holdings, AG

10.14(11)†		Amended and Restated Employment Agreement — Form for Certain Executive Officers

10.15(12)†		Amended and Restated Employment Agreement, dated as of October 1, 2008, by and between Allied World National Assurance Company and W. Gordon Knight

10.16(13)†		Amended and Restated Employment Agreement, dated as of October 1, 2008, by and between Allied World Reinsurance Agreement n/k/a Allied World Insurance Company and John R. Bender

10.17(13)†		Amended and Restated Employment Agreement, dated as of October 1, 2008, by and between Allied World National Assurance Company and John J. McElroy

10.18(14)†		Second Amended and Restated Employment Agreement, dated as of March 1, 2009, by and between Allied World Assurance Company Holdings, Ltd and Scott A. Carmilani

10.19(15)†		Employment Agreement, dated as of July 1, 2010, by and between Newmarket Administrative Services, Inc. n/k/a AWAC Services Company and John J. Gauthier

10.20(3)†		Form of Employment Agreement Amendment with regard to Swiss requirements for certain officers of Allied World Assurance Company Holdings, AG

10.21(3)†		Employment Agreement Amendment with regard to Swiss requirements for John Gauthier

10.22(16)†		Allied World Assurance Company Holdings, AG Third Amended and Restated Long-Term Incentive Plan

10.23(17)†		Form of Participation Agreement under the Allied World Assurance Company Holdings, AG Third Amended and Restated Long-Term Incentive Plan

10.24(16)†		Allied World Assurance Company Holdings, AG Third Amended and Restated 2001 Employee Stock Option Plan

10.25(18)†		Form of Option Grant Notice and Option Agreement under Allied World Assurance Company Holdings, AG Third Amended and Restated 2001 Employee Stock Option Plan

10.26(19)†		Form of Option Grant Notice and Option Agreement under Allied World Assurance Company Holdings, AG Third Amended and Restated 2001 Employee Stock Option Plan, as amended in August 2011

E-2


Exhibit Number		Description

10.27(16)†		Allied World Assurance Company Holdings, AG Third Amended and Restated 2004 Stock Incentive Plan

10.28(18)†		Form of RSU Award Agreement for employees under the Allied World Assurance Company Holdings, AG Third Amended and Restated 2004 Stock Incentive Plan

10.29(17)†		Form of RSU Award Agreement for non-employee directors under the Allied World Assurance Company Holdings, AG Third Amended and Restated 2004 Stock Incentive Plan

10.30(20)†		Form of RSU Award Agreement for employees under the Allied World Assurance Company Holdings, AG Third Amended and Restated 2004 Stock Incentive Plan, as amended in May 2009

10.31(21)†		Form of RSU Award Agreement for employees under the Allied World Assurance Company Holdings, AG Third Amended and Restated 2004 Stock Incentive Plan, as amended in November 2009

10.32(19)†		Form of RSU Award Agreement for employees under the Allied World Assurance Company Holdings, AG Third Amended and Restated 2004 Stock Incentive Plan, as amended in August 2011

10.33(19)†		Form of RSU Award Agreement for non-employee directors under the Allied World Assurance Company Holdings, AG Third Amended and Restated 2004 Stock Incentive Plan, as amended in August 2011

10.34(22)†		Form of Performance-Based RSU Award Agreement under the Allied World Assurance Company Holdings, AG Third Amended and Restated 2004 Stock Incentive Plan

10.35(19)†		Form of Performance-Based RSU Award Agreement under the Allied World Assurance Company Holdings, AG Third Amended and Restated 2004 Stock Incentive Plan, as amended in August 2011

10.36(23)†		Form of Performance-Based Equity Award Agreement

10.37(13)†		Allied World Assurance Company Holdings, AG 2012 Omnibus Incentive Compensation Plan

10.38(13)†		Form of RSU Award Agreement under the Allied World Assurance Company Holdings, AG 2012 Omnibus Incentive Compensation Plan

10.39(13)†		Form of Performance-Based Compensation Award Agreement under the Allied World Assurance Company Holdings, AG 2012 Omnibus Incentive Compensation Plan

10.40(24)†		Allied World Assurance Company Holdings, AG Amended and Restated 2008 Employee Share Purchase Plan

10.41(21)†		Allied World Assurance Company (U.S.) Inc. Second Amended and Restated Supplemental Executive Retirement Plan

10.42(21)		Amended and Restated Accounting Services Agreement, dated as of April 1, 2009, by and between Allied World Assurance Company, Ltd and BlackRock Financial Management, Inc.

10.43(25)		Investment Management Agreement, dated as of September 27, 2011, by and between Allied World Assurance Company, Ltd and BlackRock Financial Management, Inc.

21.1		Subsidiaries of the Registrant

23.1		Consent of Deloitte & Touche Ltd., an independent registered public accounting firm

31.1		Certification by Chief Executive Officer, as required by Section 302 of the Sarbanes-Oxley Act of 2002

31.2		Certification by Chief Financial Officer, as required by Section 302 of the Sarbanes-Oxley Act of 2002

E-3


Exhibit Number		Description

32.1*		Certification by Chief Executive Officer, as required by Section 906 of the Sarbanes-Oxley Act of 2002

32.2*		Certification by Chief Financial Officer, as required by Section 906 of the Sarbanes-Oxley Act of 2002

101.1**		Interactive data files pursuant to Rule 405 of Regulation S-T: (i) the Consolidated Balance Sheets as of December 31, 2012 and 2011, (ii) the Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2012, 2011 and 2010, (iii) the Consolidated Statements of Shareholders’ Equity for the years ended December 31, 2012, 2011 and 2010, (iv) the Consolidated Statements of Cash Flows for the years ended December 31, 2012, 2011 and 2010, (v) the Notes to the Consolidated Financial Statements and (vi) Schedules III and IV

(1)	Incorporated herein by reference to the Current Report on Form 8-K of Allied World Assurance Company Holdings, AG filed with the SEC on December 21, 2012.

(2)	Incorporated herein by reference to the Current Report on Form 8-K of Allied World Assurance Company Holdings, AG filed with the SEC on August 3, 2012.

(3)	Incorporated herein by reference to the Annual Report on Form 10-K of Allied World Assurance Company Holdings, AG filed with the SEC on March 1, 2011.

(4)	Incorporated herein by reference to the Current Report on Form 8-K of Allied World Assurance Company Holdings, AG filed with the SEC on August 1, 2006.

(5)	Incorporated herein by reference to the Current Report on Form 8-K of Allied World Assurance Company Holdings, AG filed with the SEC on January 5, 2011.

(6)	Incorporated herein by reference to the Current Report on Form 8-K of Allied World Assurance Company Holdings, AG filed with the SEC on November 15, 2010.

(7)	Incorporated herein by reference to the Current Report on Form 8-K of Allied World Assurance Company Holdings, AG filed with the SEC on March 6, 2007.

(8)	Incorporated herein by reference to the Current Report on Form 8-K of Allied World Assurance Company Holdings, AG filed with the SEC on January 5, 2009.

(9)	Incorporated herein by reference to the Current Report on Form 8-K of Allied World Assurance Company Holdings, AG filed with the SEC on June 13, 2012.

(10)	Incorporated herein by reference to the Current Report on Form 8-K of Allied World Assurance Company Holdings, AG filed with the SEC on December 1, 2010.

(11)

Incorporated herein by reference to the Annual Report on Form 10-K of Allied World Assurance Company Holdings, AG filed with the SEC on February 27, 2009. Other than with respect to title, base salary and housing allowance, the amended and restated employment agreements, dated as of October 1, 2008, for Frank D’Orazio, Wesley Dupont and Marshall Grossack are identical to the form filed as Exhibit 10.41 thereto.

(12)	Incorporated herein by reference to the Annual Report on Form 10-K of Allied World Assurance Company Holdings, AG filed with the SEC on February 27, 2009.

(13)	Incorporated herein by reference to the Annual Report on Form 10-Q of Allied World Assurance Company Holdings, AG filed with the SEC on May 9, 2012

(14)	Incorporated herein by reference to the Current Report on Form 8-K of Allied World Assurance Company Holdings, AG filed with the SEC on March 5, 2009.

(15)	Incorporated herein by reference to the Quarterly Report on Form 10-Q of Allied World Assurance Company Holdings, AG filed with the SEC on November 5, 2010.

E-4

(16)	Incorporated herein by reference to the Post-Effective Amendment No. 1 to the Registration Statement on Form S-8 (Registration No. 333-136420) of Allied World Assurance Company Holdings, AG filed with the SEC on December 1, 2010.

(17)	Incorporated herein by reference to the Registration Statement on Form S-1 (Registration No. 333-132507) of Allied World Assurance Company Holdings, AG filed with the SEC on March 17, 2006, as amended, and declared effective by the SEC on July 11, 2006.

(18)	Incorporated herein by reference to the Quarterly Report on Form 10-Q of Allied World Assurance Company Holdings, AG filed with the SEC on May 9, 2008.

(19)	Incorporated herein by reference to the Quarterly Report on Form 10-Q of Allied World Assurance Company Holdings, AG filed with the SEC on August 9, 2011

(20)	Incorporated by reference to the Quarterly Report on Form 10-Q of Allied World Assurance Company Holdings, AG filed with the SEC on May 8, 2009.

(21)	Incorporated herein by reference to the Annual Report on Form 10-K of Allied World Assurance Company Holdings, AG filed with the SEC on March 1, 2010.

(22)	Incorporated herein by reference to the Quarterly Report on Form 10-Q of Allied World Assurance Company Holdings, AG filed with the SEC on May 7, 2010.

(23)	Incorporated by reference to the Current Report on Form 8-K of Allied World Assurance Company Holdings, AG filed with the SEC on September 18, 2009.

(24)	Incorporated herein by reference to the Post-Effective Amendment No. 1 to the Registration Statement on Form S-8 (Registration No. 333-151298) of Allied World Assurance Company Holdings, AG filed with the SEC on December 1, 2010.

(25)	Incorporated herein by reference to Annual Report on Form 10-K of Allied World Assurance Company Holdings, AG, filed with the SEC on February 29, 2012.

†	Management contract or compensatory plan, contract or arrangement.

*	These certifications are being furnished solely pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, chapter 63 of title 18 United States Code) and are not being filed as part of this report.

In accordance with Rule 406T of Regulation S-T, the information in Exhibit 101.1 to this Annual Report on Form 10-K is deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act, is deemed not filed for purposes of Section 18 of the Exchange Act and otherwise is not subject to liability under these sections.

E-5

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG


	Page No.
Report of Independent Registered Public Accounting Firm		F-2
Consolidated Balance Sheets as of December 31, 2012 and 2011		F-3
Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2012, 2011 and 2010		F-4
Consolidated Statements of Shareholders’ Equity for the years ended December 31, 2012, 2011 and 2010		F-5
Consolidated Statements of Cash Flows for the years ended December 31, 2012, 2011 and 2010		F-6
Notes to Consolidated Financial Statements		F-7
Schedule III — Supplementary Insurance Information		S-1
Schedule IV — Supplementary Reinsurance Information		S-2

F-1

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders of

Allied World Assurance Company Holdings, AG

Zug, Switzerland

We have audited the accompanying consolidated balance sheets of Allied World Assurance Company Holdings, AG and subsidiaries (the “Company”) as of December 31, 2012 and 2011, and the related consolidated statements of operations and comprehensive income, shareholders’ equity, and cash flows for each of the three years in the period ended December 31, 2012. Our audits also included the financial statement schedules listed in the Index at Item 15. These financial statements and financial statement schedules are the responsibility of the Company’s management. Our responsibility is to express an opinion on the financial statements and financial statement schedules based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of Allied World Assurance Company Holdings, AG and subsidiaries as of December 31, 2012 and 2011, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2012, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, such financial statement schedules, when considered in relation to the basic consolidated financial statements taken as a whole, present fairly, in all material respects, the information set forth therein.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company’s internal control over financial reporting as of December 31, 2012, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 25, 2013 expressed an unqualified opinion on the Company’s internal control over financial reporting.

/s/ Deloitte & Touche Ltd.

Hamilton, Bermuda

February 25, 2013

F-2

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

CONSOLIDATED BALANCE SHEETS

as of December 31, 2012 and 2011

(Expressed in thousands of United States dollars, except share and per share amounts)


	As of December 31, 2012			As of December 31, 2011
ASSETS:
Fixed maturity investments available for sale, at fair value (amortized cost: 2012: $0; 2011: $226,397)	$	—		$	244,016
Fixed maturity investments trading, at fair value (amortized cost: 2012: $6,473,429; 2011: $6,207,991)		6,626,454			6,254,686
Equity securities trading, at fair value (cost: 2012: $480,312; 2011: $356,370)		523,949			367,483
Other invested assets		783,534			540,409

Total investments		7,933,937			7,406,594
Cash and cash equivalents		681,879			633,996
Restricted cash		183,485			82,608
Insurance balances receivable		846,900			652,158
Prepaid reinsurance		277,406			226,721
Reinsurance recoverable		1,141,110			1,002,919
Accrued investment income		29,135			38,263
Net deferred acquisition costs		108,010			100,334
Goodwill		268,376			268,376
Intangible assets		51,365			53,898
Balances receivable on sale of investments		418,879			580,443
Net deferred tax assets		25,580			22,646
Other assets		63,884			53,202

Total assets	$	12,029,946		$	11,122,158

LIABILITIES:
Reserve for losses and loss expenses	$	5,645,549		$	5,225,143
Unearned premiums		1,218,021			1,078,412
Reinsurance balances payable		136,264			124,539
Balances due on purchases of investments		759,934			616,728
Senior notes		798,215			797,949
Dividends payable		—			14,302
Accounts payable and accrued liabilities		145,628			116,063

Total liabilities	$	8,703,611		$	7,973,136

SHAREHOLDERS’ EQUITY:
Common shares: 2012: par value CHF 12.64 per share and 2011: par value CHF 14.03 per share (2012: 36,369,868; 2011: 40,003,642 shares issued and 2012: 34,797,781; 2011: 37,742,131 shares outstanding)		454,980			557,153
Additional paid-in capital		—			78,225
Treasury shares, at cost (2012: 1,572,087; 2011: 2,261,511)		(113,818	)		(136,590	)
Retained earnings		2,985,173			2,635,750
Accumulated other comprehensive income: net unrealized gains on investments, net of tax		—			14,484

Total shareholders’ equity		3,326,335			3,149,022

Total liabilities and shareholders’ equity	$	12,029,946		$	11,122,158

See accompanying notes to the consolidated financial statements.

F-3

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME

for the years ended December 31, 2012, 2011 and 2010

(Expressed in thousands of United States dollars, except share and per share amounts)


	2012			2011			2010
REVENUES:
Gross premiums written	$	2,329,271		$	1,939,521		$	1,758,397
Premiums ceded		(491,448	)		(405,755	)		(365,942	)

Net premiums written		1,837,823			1,533,766			1,392,455
Change in unearned premiums		(88,925	)		(76,774	)		(32,907	)

Net premiums earned		1,748,898			1,456,992			1,359,548
Net investment income		167,141			195,948			244,143
Net realized investment gains		306,436			10,077			285,612
Net impairment charges recognized in earnings		—			—			(168	)
Other income		—			101,744			913

		2,222,475			1,764,761			1,890,048

EXPENSES:
Net losses and loss expenses		1,139,264			959,156			707,883
Acquisition costs		205,722			167,295			159,489
General and administrative expenses		307,321			271,656			286,557
Amortization of intangible assets		2,533			2,978			3,483
Interest expense		55,405			54,989			40,242
Foreign exchange loss		783			3,159			444

		1,711,028			1,459,233			1,198,098

Income before income taxes		511,447			305,528			691,950
Income tax expense		18,440			30,980			26,945

NET INCOME		493,007			274,548			665,005

Other comprehensive loss:
Unrealized (losses) gains on investments arising during the year net of applicable deferred income tax (benefit) expense 2012: $(265); 2011: $3,035; 2010: $10,209		(493	)		5,243			162,653
Reclassification adjustment for net realized investment gains included in net income, net of applicable income tax		(13,991	)		(47,894	)		(213,478	)

Other comprehensive loss		(14,484	)		(42,651	)		(50,825	)

COMPREHENSIVE INCOME	$	478,523		$	231,897		$	614,180

PER SHARE DATA
Basic earnings per share	$	13.67		$	7.21		$	14.30
Diluted earnings per share	$	13.30		$	6.92		$	13.32
Weighted average common shares outstanding		36,057,145			38,093,351			46,491,279
Weighted average common shares and common share equivalents outstanding		37,069,885			39,667,905			49,913,317
Dividends paid per share	$	1.875		$	0.750		$	1.050

See accompanying notes to the consolidated financial statements.

F-4

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

for the years ended December 31, 2012, 2011 and 2010

(Expressed in thousands of United States dollars)


	Share Capital			Additional Paid-in Capital			Treasury Shares			Accumulated Other Comprehensive Income			Retained Earnings			Total
December 31, 2009	$	1,492		$	1,359,934		$	—		$	149,849		$	1,702,020		$	3,213,295
Cumulative effect adjustment(1)		—			—			—			(41,889	)		41,889			—
Net income		—			—			—			—			665,005			665,005
Dividends		—			—			—			—			(47,712	)		(47,712	)
Other comprehensive loss		—			—			—			(50,825	)		—			(50,825	)
Stock compensation		38			40,697			—			—			—			40,735
Share repurchases		—			—			(674,662	)		—			—			(674,662	)
Shares cancelled		—			(561,851	)		561,851			—			—			—
Recapitalization(2)		598,525			(598,525	)		—			—			—			—
Repurchase of founder warrants		—			(70,016	)		—			—			—			(70,016	)

December 31, 2010	$	600,055		$	170,239		$	(112,811	)	$	57,135		$	2,361,202		$	3,075,820

December 31, 2010	$	600,055		$	170,239		$	(112,811	)	$	57,135		$	2,361,202		$	3,075,820
Net income		—			—			—			—			274,548			274,548
Dividends — par value reduction		(42,902	)		—			—			—			—			(42,902	)
Other comprehensive loss		—			—			—			(42,651	)		—			(42,651	)
Stock compensation		—			(38,394	)		62,921			—			—			24,527
Share repurchases		—			—			(86,700	)		—			—			(86,700	)
Repurchase of founder warrants		—			(53,620	)		—			—			—			(53,620	)

December 31, 2011	$	557,153		$	78,225		$	(136,590	)	$	14,484		$	2,635,750		$	3,149,022

December 31, 2011	$	557,153		$	78,225		$	(136,590	)	$	14,484		$	2,635,750		$	3,149,022
Net income		—			—			—			—			493,007			493,007
Dividends — par value reduction		(53,523	)		—			—			—			—			(53,523	)
Other comprehensive loss		—			—			—			(14,484	)		—			(14,484	)
Stock compensation		—			(27,099	)		43,354			—			—			16,255
Share repurchases		—			—			(263,942	)		—			—			(263,942	)
Shares cancelled		(48,650	)		(51,126	)		243,360			—			(143,584	)		—

December 31, 2012	$	454,980		$	—		$	(113,818	)	$	—		$	2,985,173		$	3,326,335

(1)	Cumulative effect adjustment reflects adoption of ASU 2010-11 as of July 1, 2010.

(2)	As a result of the redomestication, share capital was increased on a net basis. For additional details refer to Note 11(b).

See accompanying notes to the consolidated financial statements.

F-5

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

CONSOLIDATED STATEMENTS OF CASH FLOWS

for the years ended December 31, 2012, 2011 and 2010

(Expressed in thousands of United States dollars)


	2012			2011			2010
CASH FLOWS PROVIDED BY OPERATING ACTIVITIES:
Net income	$	493,007		$	274,548		$	665,005
Adjustments to reconcile net income to cash provided by operating activities:
Net realized gains (losses) on sales of investments		55,865			(82,764	)		(217,661	)
Mark to market adjustments		(180,380	)		22,654			(71,909	)
Stock compensation expense		17,642			22,294			34,243
Net impairment charges recognized in earnings		—			—			168
Changes in:
Reserve for losses and loss expenses, net of reinsurance recoverables		282,215			270,624			109,819
Unearned premiums, net of prepaid reinsurance		88,924			76,775			32,907
Insurance balances receivable		(194,742	)		(122,231	)		(134,306	)
Reinsurance balances payable		11,725			24,807			(3,105	)
Net deferred acquisition costs		(7,676	)		(3,531	)		(8,982	)
Net deferred tax assets		200			129			12,364
Accounts payable and accrued liabilities		27,815			10,053			13,969
Other items, net		34,843			54,750			18,752

Net cash provided by operating activities		629,438			548,108			451,264

CASH FLOWS (USED IN) PROVIDED BY INVESTING ACTIVITIES:
Purchases of available for sale securities		—			(727	)		(133,079	)
Purchases of trading securities		(8,006,237	)		(7,854,053	)		(12,816,343	)
Purchases of other invested assets		(333,031	)		(281,957	)		(165,505	)
Sales of available for sale securities		236,978			609,833			2,687,129
Sales of trading securities		7,892,907			6,942,291			10,936,501
Sales of other invested assets		53,741			71,543			9,746
Purchases of fixed assets		(3,214	)		(9,819	)		(9,576	)
Change in restricted cash		(100,877	)		13,765			(8,810	)

Net cash (used in) provided by investing activities		(259,733	)		(509,124	)		500,063

CASH FLOWS USED IN FINANCING ACTIVITIES:
Dividends paid — par value reduction		(67,825	)		(28,600	)		—
Dividends paid		—			—			(47,712	)
Proceeds from the exercise of stock options		10,527			6,837			9,598
Share repurchases		(263,942	)		(86,700	)		(674,662	)
Repurchase of founder warrants		—			(53,620	)		(70,016	)
Proceeds from senior notes		—			—			296,682

Net cash used in financing activities		(321,240	)		(162,083	)		(486,110	)

Effect of exchange rate changes on foreign currency cash		(582	)		100			(410	)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		47,883			(122,999	)		464,807
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR		633,996			756,995			292,188

CASH AND CASH EQUIVALENTS, END OF YEAR	$	681,879		$	633,996		$	756,995

Supplemental disclosure of cash flow information:
— Cash paid for income taxes	$	23,957		$	14,132		$	22,556
— Cash paid for interest expense	$	54,000		$	54,000		$	37,500

See accompanying notes to the consolidated financial statements.

F-6

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

1. GENERAL

Allied World Assurance Company Holdings, AG, a Swiss holding company (“Allied World Switzerland”), through its wholly-owned subsidiaries (collectively, the “Company”), provides property and casualty insurance and reinsurance on a worldwide basis through operations in Bermuda, the United States, Europe, Hong Kong, Labuan and Singapore.

2. SIGNIFICANT ACCOUNTING POLICIES

These consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”). The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The significant estimates reflected in the Company’s financial statements include, but are not limited to:

•

The premium estimates for certain reinsurance agreements,

•

Recoverability of deferred acquisition costs,

•

The reserve for outstanding losses and loss expenses,

•

Valuation of ceded reinsurance recoverables,

•

Determination of impairment of goodwill and other intangible assets, and

•

Valuation of financial instruments.

Intercompany accounts and transactions have been eliminated on consolidation and all entities meeting consolidation requirements have been included in the consolidation. Certain immaterial reclassifications in the consolidated statements of operations and comprehensive income (“consolidated income statements”), consolidated statements of cash flows and notes to the consolidated financial statements have been made to prior years’ amounts to conform to the current year’s presentation.

The significant accounting policies are as follows:

a) Premiums and Acquisition Costs

Premiums are recorded as written on the inception date of the policy. For certain types of business written by the Company, notably reinsurance, premium income may not be known at the policy inception date. In the case of quota share reinsurance treaties assumed by the Company, the underwriter makes an estimate of premium income at inception. The underwriter’s estimate is based on statistical data provided by reinsureds and the underwriter’s judgment and experience. Such estimations are refined over the reporting period of each treaty as actual written premium information is reported by ceding companies and intermediaries. Premiums resulting from such adjustments are estimated and accrued based on available information. Certain insurance and reinsurance contracts may require that the premium be adjusted at the expiry of the contract to reflect the change in exposure or loss experience of the insured or reinsured.

Premiums are recognized as earned over the period of policy coverage in proportion to the risks to which they relate. Premiums relating to the unexpired periods of coverage are recorded on the balance sheets as “unearned premiums”. Reinsurance premiums under a quota share reinsurance contract are typically earned over the same period as the underlying policies, or risks, covered by the contract.

Acquisition costs, comprised of commissions, brokerage fees and insurance taxes, are costs that are directly related to the successful acquisition of new and renewal business. While permitted under U.S. GAAP to defer

F-7

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

certain internal costs that are directly related to the successful acquisition of new and renewal business, the Company does not defer such costs. Acquisition costs that are deferred are expensed as the premiums to which they relate are earned. Acquisition costs relating to the reserve for unearned premiums are deferred and carried on the balance sheets as an asset and are amortized over the period of coverage. Expected losses and loss expenses, other costs and anticipated investment income related to these unearned premiums are considered in determining the recoverability or deficiency of deferred acquisition costs. If it is determined that deferred acquisition costs are not recoverable, they are expensed. Further analysis is performed to determine if a liability is required to provide for losses which may exceed the related unearned premiums.

b) Reserve for Losses and Loss Expenses

The reserve for losses and loss expenses is comprised of two main elements: outstanding loss reserves (“OSLR,” also known as case reserves) and reserves for losses incurred but not reported (“IBNR”). OSLR relate to known claims and represent management’s best estimate of the likely loss payment. IBNR relates to reserves established by the Company for claims that have occurred but have not yet been reported to us as well as for changes in the values of claims that have been reported to us but are not yet settled.

The reserve for IBNR is estimated by management for each line of business based on various factors including underwriters’ expectations about loss experience, actuarial analysis, comparisons with the results of industry benchmarks and loss experience to date. The Company’s actuaries employ generally accepted actuarial methodologies to determine estimated ultimate loss reserves. The adequacy of the reserves is re-evaluated quarterly by the Company’s actuaries. At the completion of each quarterly review of the reserves, a reserve analysis is prepared and reviewed with the Company’s loss reserve committee. This committee determines management’s best estimate for loss and loss expense reserves based upon the reserve analysis.

While management believes that the reserves for OSLR and IBNR are sufficient to cover losses assumed by the Company, there can be no assurance that losses will not deviate from the Company’s reserves, possibly by material amounts. The methodology of estimating loss reserves is periodically reviewed to ensure that the assumptions made continue to be appropriate. The Company recognizes any changes in its loss reserve estimates and the related reinsurance recoverables in the consolidated income statements in the periods in which they are determined. These are recorded in “net losses and loss expenses”.

c) Ceded Reinsurance

In the ordinary course of business, the Company uses both treaty and facultative reinsurance to minimize its net loss exposure to any one catastrophic loss event or to an accumulation of losses from a number of smaller events. Reinsurance premiums ceded are expensed and any commissions recorded thereon are earned over the period the reinsurance coverage is provided in proportion to the risks to which they relate. Any unearned ceding commission is included in “net deferred acquisitions costs” on the consolidated balance sheets and is recorded as a reduction to the overall net deferred acquisition cost balance. Prepaid reinsurance represents unearned premiums ceded to reinsurance companies. Reinsurance recoverable includes the balances due from those reinsurance companies under the terms of the Company’s reinsurance agreements for unpaid losses and loss reserves, including IBNR. Amounts recoverable from reinsurers are estimated in a manner consistent with the estimated claim liability associated with the reinsured policy.

The Company determines the portion of the IBNR liability that will be recoverable under its reinsurance contracts by reference to the terms of the reinsurance protection purchased. This determination is necessarily based on the estimate of IBNR and accordingly, is subject to the same uncertainties as the estimate of IBNR.

The Company remains liable to the extent that its reinsurers do not meet their obligations under the reinsurance contracts; therefore, the Company regularly evaluates the financial condition of its reinsurers and monitors concentration of credit risk.

F-8

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

d) Investments

Investments in fixed-maturity securities are classified as either trading or available for sale. Investments in equity securities are classified as trading. Trading securities are carried at fair value with any change in unrealized gains or losses recognized in the consolidated income statements and included in “net realized investment gains”. Available for sale securities are carried at fair value with any change in unrealized gains or losses included as a separate component of “accumulated other comprehensive income” on the consolidated balance sheets.

As permitted under the transitional provisions of Accounting Standards Update (“ASU”) 2010-11 “Derivatives and Hedging: Scope Exception Related to Embedded Credit Derivatives” (“ASU 2010-11”), effective July 1, 2010 the Company elected the fair value option for any investment in a beneficial interest in a securitized asset. As a result, the Company elected the fair value option for all of its mortgage-backed and asset-backed securities held as of June 30, 2010. On July 1, 2010, the Company reclassified net unrealized gains of $41,889 from “accumulated other comprehensive income” to “retained earnings”. As a result of the fair value election, any change in fair value of the mortgage-backed and asset-backed securities is recognized in “net realized investment gains” on the consolidated income statement.

Also included in the Company’s trading securities are to-be-announced mortgage-backed securities, fixed maturity investments that the Company accounts for as derivatives in accordance with U.S. GAAP. As a result, these securities are included in “fixed maturity investments trading, at fair value” on the consolidated balance sheets and any change in unrealized gains or losses is recognized in the consolidated income statements and included in “net realized investment gains”.

Other invested assets consist primarily of investments in hedge funds and private equity funds, which have been accounted for as trading securities. In addition, included in the Company’s other invested assets are various investments which are accounted for using the equity method of accounting. Generally, the Company uses the equity method where it does not have a controlling interest and is not the primary beneficiary. Equity method investments are recorded at cost and adjusted for the Company’s proportionate share of earnings or losses. Other investments are recorded based on valuation techniques depending on the nature of the individual assets. The Company’s share of distributed and undistributed net income from equity method investments is included in “net investment income”.

At each measurement date, the Company estimates the fair value of the financial instruments using various valuation techniques. The Company utilizes, to the extent available, quoted market prices in active markets or observable market inputs in estimating the fair value of financial instruments. When quoted market prices or observable market inputs are not available, the Company may utilize valuation techniques that rely on unobservable inputs to estimate the fair value of financial instruments. The Company bases its determination of whether a market is active or inactive on the spread between what a seller is asking for a security and what a buyer is bidding for that security. Spreads that are significantly above historical spreads are considered inactive markets. The Company also considers the volume of trading activity in the determination of whether a market is active or inactive.

The Company utilizes independent pricing sources to obtain market quotations for securities that have quoted prices in active markets. In general, the independent pricing sources use observable market inputs including, but not limited to, investment yields, credit risks and spreads, benchmarking of like securities, reported trades and sector groupings to determine the fair value. For a majority of the portfolio, the Company obtained two or more prices per security as of December 31, 2012. When multiple prices are obtained, a price source hierarchy is utilized to determine which price source is the best estimate of the fair value of the security. The price source hierarchy emphasizes more weighting to significant observable inputs such as index pricing and less weighting towards non-binding broker-dealer quotes. In addition, to validate all prices obtained from these pricing sources including non-binding broker-dealer quotes, the Company also obtains prices from its investment

F-9

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

portfolio managers and other sources (e.g., another pricing vendor), and compares the prices obtained from the independent pricing sources to those obtained from the Company’s investment portfolio managers and other sources. The Company investigates any material differences between the multiple sources and determines which price best reflects the fair value of the individual security. There were no material differences between the prices obtained from the independent pricing sources and the prices obtained from the Company’s investment portfolio managers and other sources as of December 31, 2012 and 2011.

Investments are recorded on a trade date basis. Investment income is recognized when earned and includes the accrual of discount or amortization of premium on fixed maturity investments using the effective yield method and is net of related expenses. Interest income for debt securities where the Company has elected the fair value option is accrued and recognized based on the contractual terms of the debt securities and is included in “net investment income” in the consolidated income statements. Realized gains and losses on the disposition of investments, which are based upon the first-in first-out method of identification, are included in “net realized investment gains” in the consolidated income statements. For mortgage-backed and asset-backed securities and any other holdings for which there is a prepayment risk, prepayment assumptions are evaluated and revised on a regular basis. Revised prepayment assumptions are applied to securities on a retrospective basis to the date of acquisition. The cumulative adjustments to amortized cost required due to these changes in effective yields and maturities are recognized in net investment income in the same period as the revision of the assumptions.

e) Variable Interest Entities

The Company is involved in the normal course of business with variable interest entities (“VIEs”) as a passive investor in certain asset-backed securities issued by third party VIEs and affiliated VIEs. The Company performs a qualitative assessment at the date when it becomes initially involved in the VIE, followed by ongoing reassessments related to its involvement in VIEs. The Company’s maximum exposure to loss with respect to these investments is limited to the investment carrying amounts reported in the Company’s consolidated balance sheets and any unfunded commitments.

f) Other-Than-Temporary Impairments on Available for Sale Securities

The Company recognizes other-than-temporary impairments (“OTTI”) in the consolidated income statements if the Company intends to sell the available for sale fixed maturity security, or if it is more likely than not that the Company will be required to sell the security, before the recovery of its amortized cost basis. In addition, OTTI is recognized if the present value of the expected cash flows of an available for sale fixed maturity security is less than the amortized cost basis of the security (“credit loss”). The amount of the credit loss is recognized in the consolidated income statements and is included in “net impairment charges recognized in earnings”.

g) Translation of Foreign Currencies

Monetary assets and liabilities denominated in foreign currencies are translated into U.S. dollars at the exchange rates in effect on the balance sheet date. Foreign currency revenues and expenses are translated at the average exchange rates prevailing during the period. Exchange gains and losses, including those arising from forward exchange contracts, are included in the consolidated income statements. The Company’s functional currency, and that of its operating subsidiaries, is the U.S. dollar as it is the single largest currency in which the Company and its subsidiaries transact business and hold invested assets.

h) Cash and Cash Equivalents

Cash and cash equivalents include amounts held in banks, time deposits, commercial paper, discount notes and U.S. Treasury Bills with maturities of less than three months from the date of purchase.

F-10

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

i) Income Taxes

Allied World Switzerland and certain of its subsidiaries operate in jurisdictions where they are subject to income taxation. Current and deferred income taxes are charged or credited to operations, or to accumulated other comprehensive income in certain cases, based upon enacted tax laws and rates applicable in the relevant jurisdiction in the period in which the tax becomes payable. Deferred income taxes are provided for all temporary differences between the bases of assets and liabilities used in the financial statements and those used in the various jurisdictional tax returns.

It is the Company’s policy to recognize interest accrued related to unrecognized tax benefits in “interest expense” and penalties in “general and administrative expenses” in the consolidated income statements. The Company has not recorded any interest or penalties during the years ended December 31, 2012, 2011 and 2010 and the Company has not accrued any payment of interest and penalties as of December 31, 2012 and 2011.

j) Employee Stock Option Compensation Plan

The Company has an employee stock option plan in which the amount of Company shares received as compensation through the issuance of stock options is determined by reference to the value of the shares. Compensation expense for stock options granted to employees is recorded on a straight-line basis over the option vesting period and is based on the fair value of the stock options on the grant date. The fair value of each stock option on the grant date is determined by using the Black-Scholes option-pricing model.

k) Restricted Stock Units

The Company has granted restricted stock units (“RSUs”) to certain employees. The compensation expense for the RSUs is based on the market value of Allied World Switzerland’s common shares on the grant date, and is recognized on a straight-line basis over the applicable vesting period.

The Company has also granted cash-equivalent RSUs to certain employees that vest on a straight-line basis over the applicable vesting period. The amount payable per unit awarded will be equal to the price per share of Allied World Switzerland’s common shares and as such the Company measures the value of the award each reporting period based on the period ending share price. The effects of changes in the share price at each period end during the service period are recognized as increases or decreases in compensation expense ratably over the service period.

l) Performance-Based Equity Awards

The Company has granted long-term incentive plan (“LTIP”) awards to certain key employees in order to promote the long-term growth and profitability of the Company. Each award represents the right to receive a number of common shares in the future, based upon the achievement of established performance criteria during the applicable performance period. The compensation expense for these awards is based on the market value of Allied World Switzerland’s common shares on the grant date, and is recognized on a straight-line basis over the applicable performance and vesting period.

In addition, the Company has granted performance-based RSUs that provide performance-based equity awards to key employees in order to promote the long-term growth and profitability of the Company. Each award represents the right to receive a number of common shares in the future, based upon the achievement of established performance criteria during the applicable performance period. The compensation expense for these awards is based on the market value of Allied World Switzerland’s common shares on the grant date, and is recognized on a straight-line basis over the applicable performance and vesting period.

The Company has also granted cash-equivalent performance-based awards to certain employees that vest based upon the achievement of established performance criteria during the applicable performance period. These cash-equivalent performance-based awards vest after a three-year performance period. The amount payable per

F-11

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

unit awarded will be equal to the price per share of Allied World Switzerland’s common shares, and as such the Company measures the value of the award each reporting period based on the period ending share price. The effects of changes in the share price at each period end during the service period are recognized as changes in compensation expense ratably over the service period.

m) Goodwill and Intangible Assets

The Company classifies its intangible assets into three categories: (1) intangible assets with finite lives subject to amortization, (2) intangible assets with indefinite lives not subject to amortization, and (3) goodwill. Intangible assets, other than goodwill, generally consist of trademarks, renewal rights, internally generated software, non-compete covenants and insurance licenses held by subsidiaries domiciled in the United States.

For intangible assets with finite lives, the value of the assets is amortized over their expected useful lives and the expense is included in “amortization of intangible assets” in the consolidated income statements. The Company tests assets for impairment if conditions exist that indicate the carrying value may not be recoverable. If, as a result of the evaluation, the Company determines that the value of the intangible assets is impaired, then the value of the assets will be written-down in the period in which the determination of the impairment is made.

For indefinite lived intangible assets the Company does not amortize the intangible asset but evaluates and compares the fair value of the assets to their carrying values on an annual basis or more frequently if circumstances warrant. If, as a result of the evaluation, the Company determines that the value of the intangible assets is impaired, then the value of the assets will be written-down in the period in which the determination of the impairment is made.

Goodwill represents the excess of the cost of acquisitions over the fair value of net assets acquired and is not amortized. Goodwill is assigned at acquisition to the applicable reporting unit(s) based on the expected benefit to be received by the reporting units from the business combination. The Company determines the expected benefit based on several factors including the purpose of the business combination, the strategy of the Company subsequent to the business combination and structure of the acquired company subsequent to the business combination. A reporting unit is a component of the Company’s business that has discrete financial information that is reviewed by management. In determining the reporting unit, the Company analyzes the inputs, processes, outputs and overall operating performance of the reporting unit. The Company has determined that for purposes of the acquisition of Darwin Professional Underwriters, Inc. (“Darwin”) the U.S. insurance segment is the reporting unit that is expected to receive the benefit of the business combination and as such all of the goodwill has been allocated to this reporting unit.

For goodwill, the Company performs an annual impairment test, or more frequently if circumstances are warranted. The Company may first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. The results of the qualitative assessment will determine if an entity needs to proceed with the two-step goodwill impairment test. For the year ended December 31, 2012, the Company elected to bypass the qualitative assessment and performed the first step of the goodwill impairment test.

F-12

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

n) Derivative Instruments

The Company utilizes derivative financial instruments as part of its overall risk management strategy. The Company recognizes all derivative financial instruments at fair value as either assets or liabilities on the consolidated balance sheets. The accounting for gains and losses associated with changes in the fair value of a derivative and the effect on the consolidated financial statements depends on its hedge designation and whether the hedge is highly effective in achieving offsetting changes in the fair value of the asset or liability hedged.

The Company uses currency forward contracts and foreign currency swaps to manage currency exposure. The Company also utilizes various derivative instruments such as interest rate futures and index options, for the purpose of managing market exposures, interest rate volatility, portfolio duration, hedging certain investments, or enhancing investment performance. These derivatives are not designated as hedges and accordingly are carried at fair value on the consolidated balance sheets with realized and unrealized gains and losses included in the consolidated income statements. Refer to Note 4 for the Company’s related disclosure.

o) Earnings Per Share

Basic earnings per share is defined as net income available to common shareholders divided by the weighted average number of common shares outstanding for the period, giving no effect to dilutive securities. Diluted earnings per share is defined as net income available to common shareholders divided by the weighted average number of common and common share equivalents outstanding calculated using the treasury stock method for all potentially dilutive securities, including share warrants, employee stock options, employee share repurchase plan, RSUs and LTIP awards. When the effect of dilutive securities would be anti-dilutive, these securities are excluded from the calculation of diluted earnings per share.

p) New Accounting Pronouncements

In October 2010, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2010-26, “Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts” (“ASU 2010-26”). ASU 2010-26 clarifies what costs associated with acquiring or renewing insurance contracts can be deferred and amortized over the coverage period. Under the revised guidance of ASU 2010-26, incremental direct costs that result directly from and are essential to the insurance contract and would not have been incurred had the insurance contract not been written are costs that may be capitalized, including costs relating to activities specifically performed by the Company such as underwriting, policy issuance and processing. The Company adopted ASU 2010-26 retrospectively on January 1, 2012. The adoption of ASU 2010-26 did not have an impact on consolidated shareholders’ equity or net income as the Company had not previously capitalized costs that did not meet the requirement for capitalization of the revised standard.

In May 2011, the FASB issued ASU 2011-04, “Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs” (“ASU 2011-04”). ASU 2011-04 provides a consistent meaning for the term “fair value” between the FASB and International Accounting Standards Board and establishes common requirements for measuring and disclosing information related thereto. The Company adopted ASU 2011-04 prospectively on January 1, 2012. The adoption of ASU 2011-04 did not have an impact on consolidated shareholders’ equity or net income or the Company’s fair value measurements. Refer to Note 5 for the Company’s related disclosures.

In June 2011, the FASB issued ASU 2011-05, “Presentation of Comprehensive Income” (“ASU 2011-05”). ASU 2011-05 eliminates the option to present the components of other comprehensive income as part of the statement of changes in shareholders’ equity, requires consecutive presentation of the statement of net income and other comprehensive income, and requires the presentation of reclassification adjustments on the face of the financial statements from other comprehensive income to net income. In December 2011, ASU 2011-05 was updated by ASU 2011-12, “Deferral of the Effective Date for Amendments to the Presentation of

F-13

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05” (“ASU 2011-12”) to defer the presentation requirements of reclassification adjustments required by ASU 2011-05. The Company adopted ASU 2011-05 on January 1, 2012. The adoption of ASU 2011-05 and the related updates from ASU 2011-12 did not have an impact on the presentation of the financial statements.

In September 2011, the FASB issued ASU 2011-08, “Testing Goodwill for Impairment” (“ASU 2011-08”). ASU 2011-08 simplifies how goodwill is tested for impairment by permitting entities to assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. The results of the qualitative assessment will determine if an entity needs to proceed with the two-step goodwill impairment test. ASU 2011-08 is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. The Company adopted ASU 2011-08 on January 1, 2012. The adoption of ASU 2011-08 did not have an impact on consolidated shareholders’ equity or net income.

In July 2012, the FASB issued ASU 2012-02, “Testing Indefinite-Lived Intangible Assets for Impairment” (“ASU 2012-02”). ASU 2012-02 modifies both annual and interim impairment testing and allows the inclusion of qualitative factors in the assessment of whether a quantitative impairment test is necessary. When an entity’s qualitative assessment reveals that indefinite-lived intangible asset impairment is more likely than not, the entity must perform the quantitative impairment test. The amendments did not change the existing accounting guidance on how this impairment test is performed. ASU 2012-02 is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012 and early adoption is permitted. The Company has not elected early adoption. The Company does not expect the adoption of this guidance to have an impact on its consolidated shareholders’ equity or net income.

3. INVESTMENTS

a) Available for Sale Securities

The amortized cost, gross unrealized gains, gross unrealized losses and fair value of the Company’s available for sale investments by category are as follows:


	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
December 31, 2011
U.S. Government and Government agencies	$	31,309	$	2,321	$	—		$	33,630
States, municipalities and political subdivisions		29,128		4,351		—			33,479
Corporate debt:
Financial institutions		17,431		348		(292	)		17,487
Industrials		73,539		4,268		—			77,807
Utilities		74,990		6,623		—			81,613

Total fixed maturity investments, available for sale	$	226,397	$	17,911	$	(292	)	$	244,016

F-14

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

b) Trading Securities

Securities accounted for at fair value with changes in fair value recognized in the consolidated income statements by category are as follows:


	December 31, 2012				December 31, 2011
	Fair Value		Amortized Cost		Fair Value		Amortized Cost
U.S. Government and Government agencies	$	1,865,913	$	1,854,198	$	1,278,265	$	1,263,948
Non-U.S. Government and Government agencies		261,627		253,657		256,756		251,784
States, municipalities and political subdivisions		40,444		39,342		133,902		128,633
Corporate debt:
Financial institutions		866,140		835,587		1,161,904		1,174,308
Industrials		1,153,909		1,139,706		987,006		974,731
Utilities		69,153		67,463		105,564		103,262
Mortgage-backed		1,958,373		1,877,854		1,818,091		1,797,687
Asset-backed		410,895		405,622		513,198		513,638

Total fixed maturity investments, trading	$	6,626,454	$	6,473,429	$	6,254,686	$	6,207,991


	December 31, 2012				December 31, 2011
	Fair Value		Cost		Fair Value		Cost
Equity securities	$	523,949	$	480,312	$	367,483	$	356,370
Other invested assets(1)		655,888		606,521		540,409		529,851

	$	1,179,837	$	1,086,833	$	907,892	$	886,221

(1)	Includes investments in both hedge funds and private equity funds, but excludes other private securities that are accounted for using the equity method of accounting at December 31, 2012.

c) Other Invested Assets

Included in other invested assets are the Company’s hedge fund and private equity investments. As of the balance sheet date, the Company held interests in 25 funds with a total fair value of $655,888. The fair values of these assets have been estimated using the net asset value per share of the funds.

In general, the Company has invested in hedge funds that require at least 30 days’ notice of redemption, and may be redeemed on a monthly, quarterly, semi-annual, annual or longer basis, depending on the fund. Certain hedge funds have lock-up periods ranging from one to three years from initial investment. A lock-up period refers to the initial amount of time an investor is contractually required to invest before having the ability to redeem. Funds that provide for periodic redemptions may, depending on the funds’ governing documents, have the ability to deny or delay a redemption request, called a “gate.” The fund may implement this restriction because the aggregate amount of redemption requests as of a particular date exceeds a specified level, generally ranging from 15% to 25% of the fund’s net assets. The gate is a method for executing an orderly redemption process to reduce the possibility of adversely affecting investors in the fund. Typically, the imposition of a gate delays a portion of the requested redemption, with the remaining portion settled in cash sometime after the redemption date. Certain funds may impose a redemption fee on early redemptions. Interests in private equity funds cannot be redeemed because the investments include restrictions that do not allow for redemption until termination of the fund.

F-15

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

Details regarding the carrying value, redemption characteristics and unfunded investment commitments of the other invested assets portfolio as of December 31, 2012 were as follows:


Fund Type	Carrying Value as of December 31, 2012		Investments with Redemption Restrictions		Estimated Remaining Restriction Period	Investments without Redemption Restrictions		Redemption Frequency(1)	Redemption Notice Period(1)	Unfunded Commitments
Private equity (primary and secondary)	$	111,879	$	111,879	3 - 10 Years	$	—			$	174,772
Mezzanine debt		29,834		29,834	8 - 9 Years		—				85,850
Distressed		9,296		9,296	4 - 6 Years		—				5,794

Total private equity		151,009		151,009			—				266,416

Distressed		138,213		102,088	1 - 2 Years		36,125	Quarterly	45 - 65 Days		—
Equity long/short		169,845		—			169,845	Quarterly	30 -60 Days		—
Multi-strategy		131,713		—			131,713	Quarterly	45 -90 Days		—
Global macro		19,117		—			19,117	Monthly	3 Days		—
Event driven		45,991		—			45,991	Quarterly	60 Days		—

Total hedge funds		504,879		102,088			402,791				—

Other private securities		127,646		—			127,646				—

Total other invested assets	$	783,534	$	253,097		$	530,437			$	266,416

(1)	The redemption frequency and notice periods only apply to the investments without redemption restrictions.

•

Private equity funds: Primary funds may invest in companies and general partnership interests. Secondary funds buy limited partnership interests from existing limited partners of primary private equity funds. As owners of private equity funds seek liquidity, they can sell their existing investments, plus any remaining commitment, to secondary market participants. These funds cannot be redeemed because the investments include restrictions that do not allow for redemption until termination of the fund.

•

Mezzanine debt funds: Mezzanine debt funds primarily focus on providing capital to upper middle market and middle market companies and private equity sponsors, in connection with leveraged buyouts, mergers and acquisitions, recapitalizations, growth financings and other corporate transactions. The most common position in the capital structure will be between the senior secured debt holder and the equity; however, the funds will utilize a flexible approach when structuring investments, which may include secured debt, subordinated debt, preferred stock and/or private equity. These funds cannot be redeemed because the investments include restrictions that do not allow for redemption until termination of the fund.

•

Distressed funds: In distressed debt investing, managers take positions in the debt of companies experiencing significant financial difficulties, including bankruptcy, or in certain positions of the capital structure of structured securities. The manager relies on the fundamental analysis of these securities, including the claims on the assets and the likely return to bondholders. Certain funds cannot be redeemed because the investments include restrictions that do not allow for redemption until termination of the fund.

•

Equity long/short funds: In equity long/short funds, managers take long positions in companies they deem to be undervalued and short positions in companies they deem to be overvalued. Long/short managers may invest in countries, regions or sectors and vary by their use of leverage and by their targeted net long position.

F-16

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

•

Multi-strategy funds: These funds may utilize many strategies employed by specialized funds including distressed investing, equity long/short, merger arbitrage, convertible arbitrage, fixed income arbitrage and macro trading.

•

Global macro funds: These funds focus on a top-down analysis of global markets as influenced by major political and economic trends or events. Global macro managers develop investment strategies that aim to forecast movements in interest rates, fund flows, political changes and other wide-ranging systematic factors. The portfolios of these funds can include long or short positions in equities, fixed-income securities, currencies and commodities in the form of cash or derivatives instruments.

•

Event driven funds: Event driven strategies seek to deploy capital into specific securities whose returns are affected by a specific event that affects the value of one or more securities of a company. Returns for such securities are linked primarily to the specific outcome of the events and not by the overall direction of the bond or stock markets. Examples could include mergers and acquisitions (arbitrage), corporate restructurings and spin-offs and capital structure arbitrage.

•

Other private securities: These securities include strategic non-controlling minority investments in private asset management companies, claims handling companies and other service companies related to the insurance industry.

d) Net Investment Income


	Year Ended December 31,
	2012			2011			2010
Fixed maturity investments	$	157,437		$	194,093			245,407
Equity securities and other invested assets (1)		23,852			15,088			9,800
Cash and cash equivalents		2,319			963			671
Expenses		(16,467	)		(14,196	)		(11,735	)

Net investment income	$	167,141		$	195,948		$	244,143

(1)	Includes the distributed and undistributed net income from investments accounted for using the equity method of accounting.

e) Components of Realized Gains and Losses


	Year Ended December 31,
	2012			2011			2010
Gross realized gains on sale of invested assets	$	183,592		$	154,941			242,421
Gross realized losses on sale of invested assets		(51,702	)		(62,169	)		(26,621	)
Net realized and unrealized losses on derivatives		(3,608	)		(70,090	)		(3,958	)
Mark-to-market changes:
Debt securities, trading		106,328			(8,078	)		42,172
Equity securities and other invested assets		71,826			(4,527	)		29,738
Gain on sale of program administrator		—			—			1,860

Net realized investment gains	$	306,436		$	10,077			285,612

Proceeds from sale of available for sale securities	$	236,336		$	646,479			2,703,695

F-17

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

f) Pledged Assets

As of December 31, 2012 and 2011, $2,141,249 and $2,029,138, respectively, of cash and cash equivalents and investments were deposited, pledged or held in trust accounts in favor of ceding companies and other counterparties or government authorities to comply with reinsurance contract provisions and insurance laws.

In addition, as of December 31, 2012 and 2011, a further $1,225,155 and $1,044,236, respectively, of cash and cash equivalents and investments were pledged as collateral for the Company’s letter of credit facilities. See Note 8(d) for details on the Company’s credit facilities.

g) Analysis of Unrealized Losses

The following table summarizes the market value of those available for sale investments in an unrealized loss position for periods less than and greater than 12 months:


	December 31, 2012				December 31, 2011
	Gross Fair		Unrealized		Gross Fair		Unrealized
	Value		Loss		Value		Loss
Less than 12 months
Corporate debt:
Financial institutions	$	—	$	—	$	9,440	$	(292	)

Total fixed maturity investments, available for sale	$	—	$	—	$	9,440	$	(292	)

As of December 31, 2012 and 2011, there were nil and three securities, respectively, in an unrealized loss position.

h) Other-Than-Temporary Impairment Charges

Following the Company’s review of the securities in the investment portfolio during the years ended December 31, 2012 and 2011, no securities were considered to be other-than-temporarily impaired. For the year ended December 31, 2010, one mortgage-backed security was considered to be other than temporarily impaired as the present value of the expected cash flows was lower than the amortized cost. The $168 of OTTI during the year ended December 31, 2010 was recognized through earnings as they were credit related losses.

F-18

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

4. DERIVATIVE INSTRUMENTS

As of December 31, 2012 and 2011, none of the Company’s derivatives were designated as hedges. The following table summarizes information on the location and amounts of derivative fair values on the consolidated balance sheets:


	December 31, 2012								December 31, 2011
	Asset Derivative Notional Amount		Asset Derivative Fair Value		Liability Derivative Notional Amount		Liability Derivative Fair Value		Asset Derivative Notional Amount		Asset Derivative Fair Value		Liability Derivative Notional Amount		Liability Derivative Fair Value
Derivatives not designated as hedging instruments
Put options(1)	$	5,152	$	532	$	—	$	—	$	4,461	$	336	$	—	$	—
Foreign exchange contracts(2)		127,712		1,713		194,566		2,656		91,162		2,030		339,533		8,934
Interest rate futures(2)		—		—		—		—		680,650		977		292,000		3,467

Total derivatives	$	132,864	$	2,245	$	194,566	$	2,656	$	776,273	$	3,343	$	631,533	$	12,401

(1)	Asset and liability derivatives relating to the put options are classified within “equity securities trading, at fair value” on the consolidated balance sheets.

(2)	All other asset and liability derivatives are classified within “other assets” or “accounts payable and accrued liabilities” on the consolidated balance sheets.

The following table provides the net realized and unrealized losses on derivatives not designated as hedges recorded on the consolidated income statements:


	Year Ended December 31,
	2012			2011			2010
Foreign exchange contracts	$	(749	)	$	(6,005	)	$	3,403

Total included in foreign exchange loss		(749	)		(6,005	)		3,403

Put options		(2,222	)		(4,125	)		—
Foreign exchange contracts		(1,024	)		(6,242	)		—
Interest rate futures		(362	)		(59,723	)		—
Treasury yield hedge		—			—			(3,958	)

Total included in net realized investment gains		(3,608	)		(70,090	)		(3,958	)

Total realized and unrealized losses on derivatives	$	(4,357	)	$	(76,095	)	$	(555	)

Derivative Instruments Not Designated as Hedging Instruments

The Company is exposed to foreign currency risk in its investment portfolio. Accordingly, the fair values of the Company’s investment portfolio are partially influenced by the change in foreign exchange rates. The Company entered into foreign currency forward contracts to manage the effect of this foreign currency risk. These foreign currency hedging activities have not been designated as specific hedges for financial reporting purposes.

The Company’s insurance and reinsurance subsidiaries and branches operate in various foreign countries and consequently the Company’s underwriting portfolio is exposed to foreign currency risk. The Company

F-19

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

manages foreign currency risk by seeking to match liabilities under the insurance policies and reinsurance contracts that it writes and that are payable in foreign currencies with cash and investments that are denominated in such currencies. When necessary, the Company may also use derivatives to economically hedge un-matched foreign currency exposures, specifically forward contracts and currency options.

The Company also purchases and sells interest rate future contracts to actively manage the duration and yield curve positioning of its fixed income portfolio. Interest rate futures can efficiently increase or decrease the overall duration of the portfolio. Additionally, interest rate future contracts can be utilized to obtain the desired position along the yield curve in order to protect against certain future yield curve shapes.

The Company also purchases options to actively manage the Company’s equity portfolio.

5. FAIR VALUE OF FINANCIAL INSTRUMENTS

In accordance with U.S. GAAP, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. There is a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon whether the inputs to the valuation of an asset or liability are observable or unobservable in the market at the measurement date, with quoted market prices being the highest level (Level 1) and unobservable inputs being the lowest level (Level 3). A fair value measurement will fall within the level of the hierarchy based on the input that is significant to determining such measurement. The three levels are defined as follows:

•

Level 1: Observable inputs to the valuation methodology that are quoted prices (unadjusted) for identical assets or liabilities in active markets.

•

Level 2: Observable inputs to the valuation methodology other than quoted market prices (unadjusted) for identical assets or liabilities in active markets. Level 2 inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical assets in markets that are not active and inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability.

•

Level 3: Inputs to the valuation methodology that are unobservable for the asset or liability.

F-20

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

The following table shows the fair value of the Company’s financial instruments and where in the fair value hierarchy the fair value measurements are included as of the dates indicated below:


					Fair value measurement using:
December 31, 2012	Carrying amount		Total fair value		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Trading securities:
U.S. Government and Government agencies	$	1,865,913	$	1,865,913	$	1,529,158	$	336,755	$	—
Non-U.S. Government and Government agencies		261,627		261,627		—		261,627		—
States, municipalities and political subdivisions		40,444		40,444		—		40,444		—
Corporate debt		2,089,202		2,089,202		—		2,089,202		—
Mortgage-backed		1,958,373		1,958,373		—		1,790,548		167,825
Asset-backed		410,895		410,895		—		348,649		62,246

Total trading fixed maturity investments		6,626,454		6,626,454

Total fixed maturity investments		6,626,454		6,626,454

Equity securities		523,949		523,949		469,269		—		54,680
Other invested assets (1)		655,888		655,888		—		—		655,888

Total investments	$	7,806,291	$	7,806,291	$	1,998,427	$	4,867,225	$	940,639

Derivative assets: (2)
Foreign exchange contracts	$	1,713	$	1,713	$	—	$	1,713	$	—
Interest rate futures		—		—		—		—		—

Derivative liabilities: (2)
Foreign exchange contracts	$	2,656	$	2,656	$	—	$	2,656	$	—
Interest rate futures		—		—		—		—		—

Senior notes	$	798,215	$	918,627	$	—	$	918,627	$	—

(1)	Excludes assets that the Company did not measure at fair value related to the Company’s investments that are accounted for using the equity method of accounting.

(2)	Asset and liability derivatives relating to foreign exchange contracts and interest rate futures are classified within “other assets” or “accounts payable and accrued liabilities” on the consolidated balance sheets.

F-21

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)


					Fair value measurement using:
December 31, 2011	Carrying amount		Total fair value		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Available for sale securities:
U.S. Government and Government agencies	$	33,630	$	33,630	$	33,630	$	—	$	—
States, municipalities and political subdivisions		33,479		33,479		—		33,479		—
Corporate debt		176,907		176,907		—		176,907		—

Total available for sale fixed maturity investments		244,016		244,016

Trading securities:
U.S. Government and Government agencies	$	1,278,265	$	1,278,265	$	1,054,003	$	224,262	$	—
Non-U.S. Government and Government agencies		256,756		256,756		—		256,756		—
States, municipalities and political subdivisions		133,902		133,902		—		133,902		—
Corporate debt		2,254,474		2,254,474		—		2,254,474		—
Mortgage-backed		1,818,091		1,818,091		—		1,568,887		249,204
Asset-backed		513,198		513,198		—		418,453		94,745

Total trading fixed maturity investments		6,254,686		6,254,686

Total fixed maturity investments		6,498,702		6,498,702

Equity securities		367,483		367,483		367,483		—		—
Other invested assets		540,409		540,409		—		—		540,409

Total investments	$	7,406,594	$	7,406,594	$	1,455,116	$	5,067,120	$	884,358

Derivative assets: (1)
Foreign exchange contracts	$	2,030	$	2,030	$	—	$	2,030	$	—
Interest rate futures		977		977		—		977		—

Derivative liabilities: (1)
Foreign exchange contracts	$	8,934	$	8,934	$	—	$	8,934	$	—
Interest rate futures		3,467		3,467		—		3,467		—

Senior notes	$	797,949	$	872,731	$	—	$	872,731	$	—

(1)	Asset and liability derivatives relating to foreign exchange contracts and interest rate futures are classified within “other assets” or “accounts payable and accrued liabilities” on the consolidated balance sheets.

The following describes the valuation techniques used by the Company to determine the fair value of financial instruments held as of the balance sheet date.

F-22

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

U.S. Government and Government agencies: Comprised primarily of bonds issued by the U.S. Treasury, the Federal Home Loan Bank, the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association. The fair values of the Company’s U.S. government securities are based on quoted market prices in active markets and are included in the Level 1 fair value hierarchy. The Company believes the market for U.S. Treasury securities is an actively traded market given the high level of daily trading volume. The fair values of U.S. government agency securities are priced using the spread above the risk-free yield curve. As the yields for the risk-free yield curve and the spreads for these securities are observable market inputs, the fair values of U.S. government agency securities are included in the Level 2 fair value hierarchy.

Non-U.S. Government and Government agencies: Comprised of fixed income obligations of non-U.S. governmental entities. The fair values of these securities are based on prices obtained from international indices and are included in the Level 2 fair value hierarchy.

States, municipalities and political subdivisions: Comprised of fixed income obligations of U.S. domiciled state and municipality entities. The fair values of these securities are based on prices obtained from the new issue market, and are included in the Level 2 fair value hierarchy.

Corporate debt: Comprised of bonds issued by corporations that are diversified across a wide range of issuers and industries. The fair values of corporate bonds that are short-term are priced using spread above the London Interbank Offered Rate yield curve, and the fair value of corporate bonds that are long-term are priced using the spread above the risk-free yield curve. The spreads are sourced from broker-dealers, trade prices and the new issue market. As the significant inputs used to price corporate bonds are observable market inputs, the fair values of corporate bonds are included in the Level 2 fair value hierarchy.

Mortgage-backed: Primarily comprised of residential and commercial mortgages originated by both U.S. government agencies (such as the Federal National Mortgage Association) and non-U.S. government agencies. The fair values of mortgage-backed securities originated by U.S. government agencies and non-U.S. government agencies are based on a pricing model that incorporates prepayment speeds and spreads to determine appropriate average life of mortgage-backed securities. The spreads are sourced from broker-dealers, trade prices and the new issue market. As the significant inputs used to price the mortgage-backed securities are observable market inputs, the fair values of these securities are included in the Level 2 fair value hierarchy, unless the significant inputs used to price the mortgage-backed securities are broker-dealer quotes and the Company is not able to determine if those quotes are based on observable market inputs, in which case the fair value is included in the Level 3 hierarchy.

Asset-backed: Principally comprised of bonds backed by pools of automobile loan receivables, home equity loans, credit card receivables and collateralized loan obligations originated by a variety of financial institutions. The fair values of asset-backed securities are priced using prepayment speed and spread inputs that are sourced from the new issue market or broker-dealer quotes. As the significant inputs used to price the asset-backed securities are observable market inputs, the fair values of these securities are included in the Level 2 fair value hierarchy, unless the significant inputs used to price the asset-backed securities are broker-dealer quotes and the Company is not able to determine if those quotes are based on observable market inputs, in which case the fair value is included in the Level 3 hierarchy.

Equity securities: Comprised of U.S. and foreign common and preferred stocks and mutual funds. Equities are generally included in the Level 1 fair value hierarchy as prices are obtained from market exchanges in active markets. Foreign mutual funds where the net asset value is not provided on a daily basis are included in the Level 3 fair value hierarchy.

F-23

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

Other invested assets: Comprised of funds invested in a range of diversified strategies. In accordance with U.S. GAAP, the fair values of the funds are based on the net asset value of the funds as reported by the fund manager that the Company believes is an unobservable input, and as such, the fair values of those funds are included in the Level 3 fair value hierarchy. The Company does not measure its investments that are accounted for using the equity method of accounting at fair value.

Derivative instruments: The fair value of foreign exchange contracts and interest rate futures are priced from quoted market prices for similar exchange-traded derivatives and pricing valuation models that utilize independent market data inputs. The fair value of derivatives are included in the Level 2 fair value hierarchy.

Senior notes: The fair value of the senior notes is based on reported trades. The fair value of the senior notes is included in the Level 2 fair value hierarchy.

The Company measures the fair value of certain assets on a non-recurring basis, generally quarterly, annually, or when events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. These assets include investments accounted for using the equity method, goodwill and intangible assets. The Company uses a variety of techniques to measure the fair value of these assets when appropriate, as described below:

Investments accounted for using the equity method: When the Company determines that the carrying value of these assets may not be recoverable, the Company records the assets at fair value with the loss recognized in income. In such cases, the Company measures the fair value of these assets using the techniques discussed above.

Goodwill and Intangible Assets: The Company tests goodwill and intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable, but at least annually for goodwill and indefinite-lived intangibles. When the Company determines that goodwill and indefinite-lived intangible assets may be impaired, the Company uses techniques, including discounted expected future cash flows and market multiple models, to measure fair value.

F-24

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

The following is a reconciliation of the beginning and ending balance of financial instruments using significant unobservable inputs (Level 3):


	Fair value measurement using significant unobservable inputs (Level 3):
	Other invested assets			Mortgage- backed			Asset-backed			Equities
Year Ended December 31, 2012
Opening balance	$	540,409		$	249,204		$	94,745		$	—
Realized and unrealized gains included in net income		37,109			11,027			1,897			4,680
Purchases		207,509			106,322			26,885			50,000
Sales		(129,139	)		(174,664	)		(75,774	)		—
Transfers into Level 3 from Level 2		—			11,716			22,950			—
Transfers out of Level 3 into Level 2 (1)		—			(35,780	)		(8,457	)		—

Ending balance	$	655,888		$	167,825		$	62,246		$	54,680

Year Ended December 31, 2011
Opening balance	$	347,632		$	172,559		$	48,707		$	—
Realized and unrealized losses included in net income		(3,620	)		(2,131	)		(362	)		—
Purchases		311,185			101,302			24,056			—
Sales		(114,788	)		(44,549	)		(3,204	)		—
Transfers into Level 3 from Level 2		—			63,717			30,536			—
Transfers out of Level 3 into Level 2 (1)		—			(41,694	)		(4,988	)		—

Ending balance	$	540,409		$	249,204		$	94,745		$	—

(1)	Transfers out of Level 3 are primarily attributable to the availability of market observable information.

Of the total realized and unrealized gains included in net income for the year ended December 31, 2012, $42,788, $1,010, $2,400 and $4,680 related to other invested assets, asset-backed securities, mortgage-backed securities and equities, respectively, for securities still held as of December 31, 2012. Of the total realized and unrealized losses included in net income for the year ended December 31, 2011, $5,302, $353 and $2,902 related to other invested assets, asset-backed securities and mortgage-backed securities, respectively, for securities still held as of December 31, 2011.

The Company attempts to verify the significant inputs used by broker-dealers in determining the fair value of the securities priced by them. If the Company could not obtain sufficient information to determine if the broker-dealers were using significant observable inputs, such securities have been transferred to the Level 3 fair value hierarchy. The Company believes the prices obtained from the broker-dealers are the best estimate of fair value of the securities being priced as the broker-dealers are typically involved in the initial pricing of the security, and the Company has compared the price per the broker-dealer to other pricing sources and noted no material differences. The Company recognizes transfers between levels at the end of the reporting period. There were no transfers between Level 1 and Level 2 during the period.

F-25

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

The Company’s external investment accounting service provider receives prices from internationally recognized independent pricing services to measure the fair values of its fixed maturity investments. Pricing sources are evaluated and selected in a manner to ensure that the most reliable sources are used. The independent pricing sources obtain market quotations and actual transaction prices for securities that have quoted prices in active markets. Each pricing service has its own proprietary method for determining the fair value of securities that are not actively traded. In general, these methods involve the use of “matrix pricing” in which the independent pricing service uses observable market inputs, including, but not limited to, reported trades, benchmark yields, broker-dealer quotes, interest rates, prepayment speeds, default rates and such other inputs as are available from market sources to determine a reasonable fair value.

All of the Company’s securities classified as Level 3, other than investments in other invested assets, are valued based on unadjusted broker-dealer quotes. This includes less liquid securities such as lower quality asset-backed securities, commercial mortgage-backed securities and residential mortgage-backed securities. The primary valuation inputs include monthly payment information, the probability of default, loss severity rates and estimated prepayment rates. Significant changes in these inputs in isolation would result in a significantly lower or higher fair value measurement. In general, a change in the assumption of the probability of default is accompanied by a directionally similar change in the assumption used for the loss severity in an event of default and prepayment rates.

The Company records the unadjusted price provided and validates this price through a process that includes, but is not limited to monthly and/or quarterly: (i) comparison of prices between two independent sources, with significant differences requiring additional price sources; (ii) quantitative analysis (e.g., comparing the quarterly return for each managed portfolio to their target benchmark, with significant differences identified and investigated); (iii) evaluation of methodologies used by external parties to calculate fair value, including a review of the inputs used for pricing; (iv) comparing the price to the Company’s knowledge of the current investment market; and (v) back-testing, which includes randomly selecting purchased or sold securities and comparing the executed prices to the fair value estimates from the pricing service. In addition to internal controls, management relies on the effectiveness of the valuation controls in place at the Company’s external investment accounting service provider (supported by a Statement on Standards for Attestation Engagements No. 16 report) in conjunction with regular discussion and analysis of the investment portfolio’s structure and performance.

6. RESERVE FOR LOSSES AND LOSS EXPENSES

The reserve for losses and loss expenses consists of the following:


	December 31,
	2012		2011
Outstanding loss reserves	$	1,539,114	$	1,366,466
Reserves for losses incurred but not reported		4,106,435		3,858,677

Reserve for losses and loss expenses	$	5,645,549	$	5,225,143

F-26

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

The table below is a reconciliation of the beginning and ending liability for unpaid losses and loss expenses. Losses incurred and paid are reflected net of reinsurance recoverables.


	Year Ended December 31,
	2012			2011			2010
Gross liability at beginning of year	$	5,225,143		$	4,879,188		$	4,761,772
Reinsurance recoverable at beginning of year		(1,002,919	)		(927,588	)		(919,991	)

Net liability at beginning of year		4,222,224			3,951,600			3,841,781

Net losses incurred related to:
Commutation of variable-rated reinsurance contracts		—			11,529			8,864
Current year		1,309,613			1,201,155			1,012,374
Prior years		(170,349	)		(253,528	)		(313,355	)

Total incurred		1,139,264			959,156			707,883

Net paid losses related to:
Current year		117,123			142,162			98,646
Prior years		743,844			542,649			498,084

Total paid		860,967			684,811			596,730

Foreign exchange revaluation		3,918			(3,721	)		(1,334	)

Net liability at end of year		4,504,439			4,222,224			3,951,600
Reinsurance recoverable at end of year		1,141,110			1,002,919			927,588

Gross liability at end of year	$	5,645,549		$	5,225,143		$	4,879,188

The commutation of variable-rated reinsurance contracts represents the reduction of ceded IBNR on commutation.

For the year ended December 31, 2012, the Company had net favorable reserve development in each of its segments due to actual loss emergence being lower than initially expected. The majority of the net favorable reserve development was recognized in the international insurance segment in the 2006 through 2008 loss years related to the general casualty, professional liability and healthcare lines of business.

For the year ended December 31, 2011, the Company had net favorable reserve development in each of its segments due to actual loss emergence being lower than initially expected. The majority of the net favorable reserve development was recognized in the international insurance and reinsurance segments in the 2005 through 2007 loss years related to the general casualty and professional liability insurance and reinsurance lines of business and the healthcare insurance line of business.

For the year ended December 31, 2010, the Company had net favorable reserve development in each of its segments due to actual loss emergence being lower than initially expected. The majority of the net favorable reserve development was recognized in the international insurance segment in the 2004 through 2006 loss years related to the general casualty, healthcare and professional liability lines of business.

While the Company has experienced favorable development in its insurance and reinsurance lines, there is no assurance that conditions and trends that have affected the development of liabilities in the past will continue. It is not appropriate to extrapolate future redundancies based on prior years’ development. The methodology of estimating loss reserves is periodically reviewed to ensure that the key assumptions used in the actuarial models continue to be appropriate.

F-27

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

7. CEDED REINSURANCE

The Company purchases reinsurance to reduce its net exposure to losses. Reinsurance provides for recovery of a portion of gross losses and loss expenses from its reinsurers. The Company remains liable to the extent that its reinsurers do not meet their obligations under these agreements. The Company therefore regularly evaluates the financial condition of its reinsurers and monitors concentration of credit risk. The Company believes that as of December 31, 2012 its reinsurers are able to meet, and will meet, all of their obligations under the agreements. No material provision has been made for unrecoverable reinsurance as of December 31, 2012 and 2011. The amount of reinsurance recoverable is as follows:


	2012		2011
OSLR Recoverable	$	234,236	$	196,484
IBNR Recoverable		906,874		806,435

Reinsurance recoverable	$	1,141,110	$	1,002,919

Reinsurance recoverable on paid losses	$	56,894	$	42,266

For treaty reinsurance, the right of offset between losses and premiums generally exists within the treaties. As a result, the net balance of reinsurance recoverable from or payable to the reinsurer has been included in “insurance balances receivable” or “reinsurance balances payable,” respectively, on the consolidated balance sheets.

Direct, assumed and ceded premiums written and earned and losses and loss expenses incurred are as follows:


	Premiums Written			Premiums Earned			Losses and Loss Expenses
Year Ended December 31, 2012
Direct	$	1,569,021		$	1,446,086		$	877,961
Assumed		760,250			743,575			513,871
Ceded		(491,448	)		(440,763	)		(252,568	)

	$	1,837,823		$	1,748,898		$	1,139,264

Year Ended December 31, 2011
Direct	$	1,369,017		$	1,266,068		$	807,721
Assumed		570,504			557,244			365,990
Ceded(1)		(405,755	)		(366,320	)		(214,555	)

	$	1,533,766		$	1,456,992		$	959,156

Year Ended December 31, 2010
Direct	$	1,234,204		$	1,221,536		$	623,585
Assumed		524,193			503,277			250,070
Ceded(2)		(365,942	)		(365,265	)		(165,772	)

	$	1,392,455		$	1,359,548		$	707,883

(1)	Includes the impact of the commutation of prior year variable-rated excess-of-loss reinsurance contracts, which decreased ceded premiums written and earned by $12,393 and increased prior year ceded losses and loss expenses by $11,529.

F-28

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

(2)	Includes the impact of the commutation of prior year variable-rated excess-of-loss reinsurance contracts, which decreased ceded premiums written and earned by $9,296 and increased prior year ceded losses and loss expenses by $8,864.

Of the premiums ceded during the years ended December 31, 2012, 2011 and 2010, approximately 48%, 54% and 56% were ceded to four reinsurers, respectively.

The Company actively manages its reinsurance exposures by generally selecting reinsurers having a credit rating of A — or higher and monitoring the overall credit quality of its reinsurers to ensure the recoverables will be collected.


	December 31, 2012						December 31, 2011
	A.M. Best Rating	Reinsurance Recoverable		Percentage of Total			A.M. Best Rating	Reinsurance Recoverable		Percentage of Total
Munich Re	A+	$	165,036		14.5	%	A+	$	114,220		11.4	%
Arch Re	A+		148,553		13.0	%	A+		153,381		15.3	%
Axis Capital	A		137,459		12.0	%	A		115,854		11.6	%
Platinum Underwriters	A		104,536		9.2	%	A		98,993		9.9	%
Odyssey Reinsurance Company	A		86,854		7.6	%	A		93,373		9.3	%

Top five reinsurers			642,438		56.3	%			575,821		57.5	%
Other reinsurers’ balances			498,672		43.7	%			427,098		42.5	%

Total reinsurance recoverable		$	1,141,110		100.0	%		$	1,002,919		100.0	%

Approximately 99% of ceded reserves were recoverable from reinsurers who had an A.M. Best rating of “A-” or higher as of December 31, 2012 and 2011.

8. DEBT AND FINANCING ARRANGEMENTS

a) Financing Structure

The following table shows the Company’s financing structure:


	Outstanding(1)		Balance(2)
December 31, 2012
2006 Senior notes due 2016	$	500,000	$	499,347
2010 Senior notes due 2020		300,000		298,868
$1,000,000 Secured letter of credit facility — uncommitted		907,592		—
$450,000 Secured letter of credit facility — committed		108,853		—

	$	1,816,445	$	798,215

December 31, 2011
2006 Senior notes due 2016	$	500,000	$	499,194
2010 Senior notes due 2020		300,000		298,755
$900,000 Secured letter of credit facility — uncommitted		675,636		—
$400,000 Secured letter of credit facility — committed		141,351		—
$400,000 Unsecured letter of credit facility — committed		—		—

	$	1,616,987	$	797,949

(1)	Indicates utilization of commitment amount, not drawn borrowings.

(2)	Represents the principal amount borrowed, net of unamortized discount.

F-29

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

b) 2006 Senior Notes Due 2016

In 2006, Allied World Assurance Company Holdings, Ltd (“Allied World Bermuda”) issued $500,000 aggregate principal amount of 7.50% Senior Notes due August 1, 2016 (the “2006 Senior Notes”), with interest payable semi-annually commencing on February 1, 2007. The 2006 Senior Notes are Allied World Bermuda’s unsecured and unsubordinated obligations and rank equally in right of payment with all existing and future unsecured and unsubordinated indebtedness. The 2006 Senior Notes can be redeemed by Allied World Bermuda prior to maturity subject to payment of a “make-whole” premium. Allied World Bermuda has no current expectations of redeeming the notes prior to maturity. The 2006 Senior Notes include covenants and events of default that are usual and customary, but do not contain any financial covenants.

c) 2010 Senior Notes Due 2020

In November 2010, Allied World Bermuda issued $300,000 aggregate principal amount of 5.50% Senior Notes due November 15, 2020 (the “2010 Senior Notes”), with interest on the notes payable semi-annually commencing on May 15, 2011. The 2010 Senior Notes are Allied World Bermuda’s unsecured and unsubordinated obligations and rank equally in right of payment with all existing and future unsecured and unsubordinated indebtedness. Allied World Bermuda may redeem the 2010 Senior Notes at any time or from time to time in whole or in part at a redemption price equal to the greater of the principal amount of the 2010 Senior Notes to be redeemed or a make-whole price, plus accrued and unpaid interest. Allied World Bermuda has no current expectations of redeeming the notes prior to maturity. The 2010 Senior Notes include covenants and events of default that are usual and customary, but do not contain any financial covenants.

d) Credit Facilities

In the normal course of its operations, the Company enters into agreements with financial institutions to obtain secured and unsecured credit facilities.

Allied World Bermuda has a collateralized amended letter of credit facility with Citibank Europe plc. that has been and will continue to be used to issue standby letters of credit. The maximum aggregate amount available under this credit facility as of December 31, 2012 is $1,000,000 (2011: $900,000) on an uncommitted basis.

On November 27, 2007, Allied World Bermuda entered into an $800,000 five-year senior credit facility (the “Credit Facility”) with a syndication of lenders. The Credit Facility consisted of a $400,000 secured letter of credit facility for the issuance of standby letters of credit (the “Secured Facility”) and a $400,000 unsecured facility for the making of revolving loans and for the issuance of standby letters of credit (the “Unsecured Facility”).

On June 7, 2012, Allied World Bermuda amended the Secured Facility. The amended $450,000 four-year secured credit facility (the “Amended Secured Credit Facility”) is primarily used for the issuance of standby letters of credit to support obligations in connection with the insurance and reinsurance business of Allied World Bermuda and its subsidiaries. A portion of the facility may also be used for revolving loans for general corporate and working capital purposes, up to a maximum of $150,000. Allied World Bermuda may request that existing lenders under the Amended Secured Credit Facility make additional commitments from time to time, up to $150,000, subject to approval by the lenders. The Amended Secured Credit Facility contains representations, warranties and covenants customary for similar bank loan facilities, including certain covenants that, among other things, require the Company to maintain a certain leverage ratio and financial strength rating.

On June 7, 2012, upon entering into the Amended Secured Credit Facility, Allied World Bermuda terminated the Unsecured Facility.

F-30

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

e) Debt Maturities

The following table reflects the Company’s debt maturities:


	Amount
2013	$	—
2014		—
2015		—
2016		500,000
2017		—
2018 and thereafter		300,000

Total	$	800,000

9. GOODWILL AND INTANGIBLE ASSETS

The following table shows the Company’s goodwill and intangible assets at December 31, 2012 and 2011:


	Goodwill		Indefinite-Lived Intangible Assets		Finite-Lived Intangible Assets
	Net Carrying Value(1)		Net Carrying Value		Gross Carrying Value(2)		Accumulated Amortization			Net Carrying Value
Balance at January 1, 2011	$	268,376	$	23,920	$	41,334	$	(8,378	)	$	32,956
Amortization of intangible assets		—		—		—		(2,978	)		(2,978	)

Balance at December 31, 2011		268,376		23,920		41,334		(11,356	)		29,978
Amortization of intangible assets		—		—		—		(2,533	)		(2,533	)

Balance at December 31, 2012	$	268,376	$	23,920	$	41,334	$	(13,889	)	$	27,445

(1)	Net of accumulated impairment charges of $156 that occurred prior to January 1, 2011.

(2)	Net of accumulated impairment charges of $6,866 that occurred prior to January 1, 2011.

Goodwill of $264,615 is allocated to the U.S. insurance segment while the remainder is allocated to the reinsurance segment. The impairment reviews for goodwill and indefinite-lived intangibles did not result in the recognition of impairment losses for the years ended December 31, 2012, 2011 and 2010.

The finite-lived intangible assets will be amortized over an expected remaining useful life of 10.8 years. The estimated amortization expense for each of the five succeeding fiscal years and thereafter related to the Company’s finite-lived intangible assets is as follows:


	Amount
2013	$	2,533
2014		2,533
2015		2,533
2016		2,533
2017		2,533
2018 and thereafter		14,780

Total	$	27,445

F-31

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

10. INCOME TAXES

Under Swiss law, a resident company is subject to income tax at the federal, cantonal and communal levels that is levied on net income. Income attributable to permanent establishments or real estate located abroad is excluded from the Swiss tax base. Allied World Switzerland is a holding company and, therefore, is exempt from cantonal and communal income tax. As a result, Allied World Switzerland is subject to Swiss income tax only at the federal level. Allied World Switzerland is resident of the Canton of Zug and, as such, is subject to an annual cantonal and communal capital tax on the taxable equity of Allied World Switzerland in Switzerland. Allied World Switzerland has a Swiss operating company resident in the Canton of Zug. The operating company is subject to federal, cantonal and communal income tax and to annual cantonal and communal capital tax.

Under current Bermuda law, Allied World Bermuda and its Bermuda subsidiaries are not required to pay taxes in Bermuda on either income or capital gains. Allied World Bermuda and Allied World Assurance Company, Ltd have received an assurance from the Bermuda Minister of Finance under the Exempted Undertakings Tax Protection Act 1966 of Bermuda, that in the event of any such taxes being imposed, Allied World Bermuda and Allied World Assurance Company, Ltd will be exempted until March 2035.

Certain subsidiaries of Allied World Switzerland file U.S. federal income tax returns and various U.S. state income tax returns, as well as income tax returns in the United Kingdom, Ireland, Switzerland, Hong Kong and Singapore. The Company has open tax years that are potentially subject to examinations by local tax authorities, in the following major tax jurisdictions: the U.S., 2009 to 2012; the United Kingdom, 2011 and 2012; Ireland, 2008 to 2012; Switzerland, 2011 and 2012; Hong Kong, 2009 to 2012; and Singapore, 2010 to 2012. To the best of the Company’s knowledge, there are no examinations pending by any tax authority.

Management has deemed all material tax positions to have a greater than 50% likelihood of being sustained based on technical merits if challenged. The Company does not expect any material unrecognized tax benefits within 12 months of December 31, 2012.

The components of income tax expense are as follows:


	Year Ended December 31,
	2012		2011		2010
Current income tax expense	$	18,239	$	30,851	$	14,560
Deferred income tax expense		201		129		12,385

Income tax expense	$	18,440	$	30,980	$	26,945

Our income is primarily sourced from our Bermuda, U.S. and European operations. The income before income taxes for these operations are as follows:


	Year Ended December 31,
	2012		2011		2010
Non-U.S.	$	474,412	$	242,353	$	615,866
United States		37,035		63,175		76,084

Income before income taxes	$	511,447	$	305,528	$	691,950

F-32

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

Deferred income taxes reflect the tax impact of temporary differences between the carrying amounts of assets and liabilities for financial reporting and income tax purposes. The significant components of the net deferred tax assets are as follows:


	December 31,
	2012			2011
Deferred tax assets:
Reserve for losses and loss expenses	$	22,843		$	20,580
Equity compensation		13,012			15,920
Unearned premium		12,688			11,382
Deferred acquisition costs		10,843			8,506
Other-than-temporary impairments		408			506
Mark-to-market on securities acquired		114			80

Total deferred tax assets		59,908			56,974

Deferred tax liabilities:
Intangible assets		(15,629	)		(16,500	)
Realized gains		(11,372	)		(6,317	)
Depreciation		(3,509	)		(4,391	)
Unrealized appreciation and timing differences on investments		(293	)		(3,135	)
Market discount on bonds		(727	)		(1,032	)
Other		(2,798	)		(2,953	)

Total deferred tax liabilities		(34,328	)		(34,328	)

Net deferred tax assets	$	25,580		$	22,646

Management believes it is more likely than not that the tax benefit of the net deferred tax assets will be realized.

Current tax receivable and payable has been included in “other assets” and “accounts payable and accrued liabilities” on the consolidated balance sheets, respectively. Current taxes receivable or payable was as follows:


	December 31,
	2012		2011
Current tax receivable	$	14,642	$	6,287

Current tax payable	$	8,731	$	8,856

F-33

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

The expected tax provision has been calculated using the pre-tax accounting income in each jurisdiction multiplied by that jurisdiction’s applicable statutory tax rate. The reconciliation between the Company’s effective tax rate on pre-tax accounting income and the expected tax rate is as follows


	Year Ended December 31,
	2012			2011			2010
Expected tax rate		7.8	%		7.8	%		7.8	%
Income not subject to income tax		(7.3	%)		(3.4	%)		(7.8	%)
Foreign taxes at local expected tax rates		2.1	%		6.0	%		3.7	%
Loss on sale of subsidiary		0.0	%		0.0	%		(0.3	%)
Disallowed expenses and capital allowances		0.7	%		0.1	%		0.1	%
Prior year refunds and adjustments		0.4	%		(0.6	%)		0.6	%
Other		(0.1	%)		0.2	%		(0.2	%)

Effective tax rate		3.6	%		10.1	%		3.9	%

11. SHAREHOLDERS’ EQUITY

a) Authorized shares

The issued share capital consists of the following:


	December 31,
	2012		2011
Common shares issued and fully paid, 2012: CHF 12.64 per share; 2011: CHF 14.03 per share		36,369,868		40,003,642

Share capital at end of year	$	454,980	$	557,153


	2012
Shares issued at beginning of year		40,003,642
Shares cancelled		(3,633,774	)

Total shares issued at end of year		36,369,868

Treasury shares issued at beginning of year		2,261,511
Shares repurchased		3,655,959
Shares issued out of treasury		(711,609	)
Shares cancelled		(3,633,774	)

Total treasury shares at end of year		1,572,087

Total shares outstanding at end of year		34,797,781

As of December 31, 2012, there were issued and outstanding 34,797,781 voting common shares and nil non-voting common shares.

Effective July 30, 2012, the Company cancelled 2,326,900 voting shares and 173,100 non-voting shares held in treasury, upon completing a required filing with the Swiss Commercial Register in Zug. During the year ended December 31, 2012, a further 1,133,774 voting shares repurchased and designated for cancellation were constructively retired and cancelled.

F-34

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

As of December 31, 2012, Allied World Switzerland’s articles of association authorized its Board of Directors to increase the share capital by a maximum amount of 20% of the share capital registered in the commercial register up to CHF 94,809 or 7,500,728 voting shares, and create conditional capital of 5,200,000 voting shares.

b) Redomestication

On December 1, 2010, Allied World Switzerland and Allied World Bermuda entered into a contribution-in-kind agreement to effect the redomestication to Switzerland. Under the terms of the contribution-in-kind agreement all issued and outstanding voting and non-voting shares of Allied World Bermuda were cancelled and issued to Allied World Switzerland as a contribution-in-kind in exchange for which the holders of such voting and non-voting shares immediately prior to the completion of the redomestication received the same number of voting and non-voting shares of Allied World Switzerland. As a result of the contribution-in-kind and the resulting par value changing from $0.03 to CHF 15.00, the share capital balance was increased to CHF 600,055 with an equal reduction in additional paid-in capital. At the time of contribution-in-kind the exchange rate between the U.S. Dollar and Swiss Franc was one-for-one.

As required under Swiss law, the Company cannot hold more than 10% of its registered capital in treasury shares, unless it receives shareholder approval to do so. As a result, immediately prior to the redomestication, the Company cancelled 10,879,106 shares held in treasury with a related reduction to additional paid in capital of $561,851.

c) Share Warrants

In conjunction with the private placement offering at the formation of Allied World Bermuda, Allied World Bermuda granted warrant agreements to certain founding shareholders to acquire up to 5,500,000 common shares at an exercise price of $34.20 per share. These warrants were exercisable in certain limited conditions, including a public offering of common shares. All warrants granted were repurchased by the Company as follows:


	The Chubb Corporation		GS Capital Partners and Other Investment Funds(1)		American International Group, Inc.
Date of repurchase		August 2010		November 2010		February 2011
Number of warrants repurchased		2,000,000		1,500,000		2,000,000
Total cost of warrants repurchased	$	32,819	$	37,197	$	53,620

(1)	Affiliates of The Goldman Sachs Group, Inc. (“Goldman Sachs”).

d) Dividends

As a holding company, Allied World Switzerland’s principal source of income is dividends or other sources of permitted payments from its subsidiaries. These funds provide the cash flow required for dividend payments to the Company’s shareholders. The ability of our insurance and reinsurance subsidiaries to make dividend payments is limited by the applicable laws and regulations of the various states and countries in which they operate.

The Company’s primary restrictions on net assets of subsidiaries consist of regulatory requirements placed upon the regulated insurance and reinsurance subsidiaries to hold minimum amounts of total statutory capital and surplus and there were no other material restrictions on net assets in place as of December 31, 2012.

Under Swiss law, distributions to shareholders may be paid only if the Company has sufficient distributable profits from previous fiscal years, or if the Company has freely distributable reserves, each as presented on the

F-35

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

audited stand-alone statutory balance sheet. Distributions to shareholders out of the share and participation capital may be made by way of a capital reduction in the form of a reduction to par value to achieve a similar result as the payment of a dividend. Under Swiss law, if the Company’s general capital reserves amount to less than 20% of the share and participation capital recorded in the Swiss Commercial Register, then at least 5% of the Company’s annual profit must be retained as general reserves.

The Company paid the following dividends during the years ended December 31, 2012, 2011 and 2010:


	Partial
	Par Value		Dividend		Total
	Reduction		Per		Amount
Dividend Paid	Per Share		Share		Paid
December 18, 2012(1)	CHF	0.34	$	0.375	$	13,010
September 25, 2012(1)	CHF	0.35	$	0.375	$	13,324
August 6, 2012(1)	CHF	0.36	$	0.375	$	13,394
April 6, 2012(2)	CHF	0.34	$	0.375	$	13,795
January 6, 2012(2)	CHF	0.35	$	0.375	$	14,302
October 7, 2011(2)	CHF	0.32	$	0.375	$	14,305
August 5, 2011(2)	CHF	0.30	$	0.375	$	14,295
November 26, 2010(3)		N/A	$	0.450	$	18,938
September 9, 2010		N/A	$	0.200	$	8,665
June 10, 2010		N/A	$	0.200	$	10,017
April 1, 2010		N/A	$	0.200	$	10,092

(1)

On May 3, 2012, the shareholders approved the Company’s proposal to pay cash dividends in the form of a distribution by way of par value reductions. The aggregate reduction amount is expected to be paid to shareholders in four installments of $0.375 per share, with the final installment to be paid in March 2013.

(2)

On May 5, 2011, the shareholders approved the Company’s proposal to pay cash dividends in the form of a distribution by way of par value reductions. The aggregate reduction amount was paid to shareholders in quarterly installments of $0.375 per share, with the last of such quarterly dividend payments being made on April 6, 2012.

(3)	Includes a special dividend of $0.25 per common share related to our redomestication to Switzerland.

e) Share Repurchases

In May 2012, the Company established a new share repurchase program in order to repurchase up to $500,000 of its common shares. Repurchases may be effected from time to time through open market purchases, privately negotiated transactions, tender offers or otherwise. The timing, form and amount of the share repurchases under the program will depend on a variety of factors, including market conditions, the Company’s capital position, legal requirements and other factors. Under the terms of this new share repurchase program, common shares repurchased shall be designated for cancellation at acquisition and shall be cancelled upon shareholder approval.

F-36

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

The Company’s share repurchases were as follows:


	Year Ended December 31,
	2012		2011		2010
Common shares repurchased		3,655,959		1,419,163		4,651,279
Total cost of shares repurchased	$	263,942	$	86,700	$	239,127
Average price per share	$	72.20	$	61.09	$	51.41

In August 2010, the Company repurchased 5,000,000 of its common shares from Goldman Sachs for $250,000, or $50.00 per share, in a privately negotiated transaction. In November 2010, the Company repurchased the remaining 3,159,793 common shares from Goldman Sachs for $185,448, or $58.69 per share. The repurchase price per common share is based on and reflects a 0.5% discount from the volume-weighted average trading price of the Company’s common shares on November 5, 2010. These repurchases were executed separately from the Company’s share repurchase program discussed above. The shares repurchased were classified as “Treasury shares, at cost” on the consolidated balance sheets.

12. EMPLOYEE BENEFIT PLANS

The Company implemented the Allied World Assurance Company Holdings, AG 2012 Omnibus Incentive Compensation Plan (the “2012 Omnibus Plan”). Under the 2012 Omnibus Plan, up to 1,500,000 common shares may be issued, subject to adjustment. The 2012 Omnibus Plan provides for the grant of options intended to qualify as incentive stock options under the Code, nonqualified stock options, stock appreciation rights, restricted shares, RSUs, deferred share units, cash incentive awards, performance-based compensation awards and other equity-based and equity-related awards. These awards generally vest pro rata over four years from the date of grant, except for the performance-based awards that will generally vest over a three-year period based on the achievement of certain performance conditions. The exercise price of options issued are recommended by the Compensation Committee to the Board of Directors for approval but shall not be less than the fair market value of the common shares of Allied World Switzerland on the date the option award is granted.

The Allied World Assurance Company Holdings, AG Third Amended and Restated 2001 Employee Stock Option Plan (the “Plan”), Allied World Assurance Company Holdings, AG Third Amended and Restated 2004 Stock Incentive Plan (the “Stock Incentive Plan”) and the Allied World Assurance Company Holdings, AG Third Amended and Restated Long-Term Incentive Plan (the “LTIP”) were automatically terminated, replaced and superseded by the 2012 Omnibus Plan on May 3, 2012, except that any outstanding awards granted under such plans remain in effect pursuant to their terms.

a) Employee option plan

Options under the Plan are exercisable in certain limited conditions, expire after 10 years, and generally vest pro-rata over four years from the date of grant. The exercise price of options issued are recommended by the Compensation Committee to the Board of Directors for approval but shall not be less than the fair market value of the common shares of Allied World Switzerland on the date the option award is granted.

The Company values share options issued with a Black-Scholes valuation model and used the following assumptions:


	Year Ended December 31,
	2011			2010
Expected term of option		5.5 years			5.5 years
Weighted average risk-free interest rate		2.33	%		2.65	%
Weighted average expected volatility		31.51	%		42.35	%
Dividend yield		1.00	%		1.25	%

F-37

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

Company specific information is used to determine the expected term of the option and the expected volatility. As a result, the expected term of the option is based on the historical terms of options granted since the inception of the Company and the expected volatility is based on the volatility of the fair market value of Allied World Switzerland’s common shares. The Company estimates expected forfeitures of option awards at the date of grant and recognizes compensation expense only for those awards that the Company expects to vest. The forfeiture assumption is ultimately adjusted to the actual forfeiture rate.

The following table summarizes the activity related to options granted and exercised:


	Year Ended December 31,
	2012		2011		2010
Options granted		—		494,885		311,610
Weighted average grant date fair value	$	—	$	18.27	$	17.34
Options exercised		267,270		179,807		304,315
Total intrinsic value of options exercised	$	9,650	$	4,070	$	5,888
Proceeds from option exercises	$	10,527	$	6,837	$	9,598

The activity related to the Company’s share options is as follows


	Year Ended December 31, 2012
	Options			Weighted Average Exercise Price			Weighted Average Contractual Term		Aggregate Intrinsic Value
Outstanding at beginning of year		1,525,853		$	45.72
Granted		—		$	—
Exercised		(267,270	)	$	(38.66	)
Forfeited		(33,315	)	$	(54.79	)
Expired		(661	)	$	(49.82	)

Outstanding at end of year		1,224,607		$	47.02			6.2 years	$	38,924

Exercisable at end of year		725,903		$	41.38			5.1 years	$	27,162

As of December 31, 2012, there was remaining $6,041 of total unrecognized compensation expense related to unvested options granted under the Plan. This expense is expected to be recognized over a weighted-average period of 1.3 years.

b) Stock incentive plan

The Company has granted RSUs under the Stock Incentive Plan. These RSUs vest pro-rata over four years from the date of grant or in the fourth or fifth year from the date of grant.

Beginning in 2010, the Company granted performance-based RSUs in lieu of utilizing the LTIP. The performance-based RSUs are structured in exactly the same form as shares issued under the LTIP in terms of vesting restrictions and achievement of established performance criteria and are accounted for consistent with the accounting policy described in Note 2(l). For the performance-based RSUs granted in 2012, 2011 and 2010, the Company anticipates that the performance goals are likely to be achieved. Based on the performance goals, the performance-based RSUs granted in 2012, 2011 and 2010 are expensed at 100% of the fair market value of Allied World Switzerland’s common shares on the date of grant. The expense is recognized over the performance period.

F-38

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

The compensation expense for the RSUs is based on the fair market value of Allied World Switzerland’s common shares at the date of grant. The Company estimates expected forfeitures of RSUs at the date of grant and recognizes compensation expense only for those awards that the Company expects to vest. The forfeiture assumption is ultimately adjusted to the actual forfeiture rate.

The activity related to the Company’s RSUs and performance-based equity awards is as follows:


	Year Ended December 31, 2012
	RSUs and Performance- based Equity Awards			Weighted Average Grant Date Fair Value			Aggregate Intrinsic Value
Outstanding at beginning of year		653,136		$	47.23
RSUs granted		37,201			63.04
RSUs forfeited		(3,463	)		(55.65	)
RSUs fully vested		(147,866	)		(40.54	)
Performance-based equity awards granted		94,169			66.88
Performance-based equity awards forfeited		(11,388	)		(12.13	)
Performance-based equity awards fully vested		(44,027	)		(31.38	)

Outstanding at end of year		577,762		$	52.56		$	45,528

The RSUs and performance-based equity awards vested in 2012, 2011 and 2010 had aggregate intrinsic values of $13,947, $19,732 and $17,302 at the time of vesting, respectively.

As of December 31, 2012, there was remaining $3,565 of total unrecognized compensation expense related to 135,123 unvested RSUs awarded. This expense is expected to be recognized over a weighted-average period of 1.5 years. As of December 31, 2012, there was remaining $6,334 of total unrecognized compensation expense related to 442,639 unvested performance-based equity awarded. This expense is expected to be recognized over a weighted-average period of 1.6 years.

c) Long-term incentive plan

Each award under the LTIP represents the right to receive a number of common shares in the future, based upon the achievement of established performance criteria during an applicable performance period. The awards granted in 2008 generally vested after the fiscal year ended December 31, 2010; however, a portion of this award vest after the fourth or fifth year from the original grant date, subject to the achievement of the performance conditions and terms of the LTIP.

The compensation expense for the LTIP is based on the fair market value of the Company’s common shares at the time of grant. In calculating the compensation expense and in the determination of share equivalents for the purpose of calculating diluted earnings per share, it is estimated for the LTIP awards granted in 2009 and 2008 that the maximum performance goals as set by the LTIP are likely to be achieved over the performance period. Based on the performance goals, the LTIP awards granted in 2009 and 2008 are expensed at 150% of the fair market value of Allied World Switzerland’s common shares on the date of grant. The expense is recognized over the performance period.

As part of the acquisition of Darwin, the Company assumed Darwin’s Long-Term Incentive Plan (“Darwin LTIP”) that it had implemented for certain of its key employees. The Darwin LTIP was intended to produce payouts consistent with long-term profitability. Accordingly, the right of offset exists where, in the event that any year produces a negative underwriting result, this negative amount would be offset against credits available under

F-39

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

the profit pool established for another year. This offset can be applied against any of the unpaid year balances whether prior or subsequent to the year in question. Interests in the Darwin LTIP vest over a four-year period. The payments due are made in increments over the fourth, fifth and sixth years. The Darwin LTIP is in run-off and any awards after 2008 to former participants in the Darwin LTIP are being granted under Allied World Switzerland’s stock plans.

The activity related to the Company’s LTIP awards is as follows:


	Year Ended December 31, 2012
	LTIP			Weighted Average Grant Date Fair Value			Aggregate Intrinsic Value
Outstanding LTIP awards at beginning of year		324,036		$	39.78
Additional LTIP awards granted due to achievement of performance criteria		147,574			39.44
LTIP fully vested		(442,721	)		(39.44	)

Outstanding LTIP at end of year		28,889		$	43.27		$	2,276

As of December 31, 2012, there was remaining $0 of total unrecognized compensation expense related to unvested LTIP awards.

d) Cash-equivalent stock awards

Since 2009, as part of the Company’s annual year-end compensation awards, the Company granted both stock-based awards and cash-equivalent stock awards. The cash-equivalent awards were granted to employees who received RSU and performance-based awards and were granted in lieu of granting the full award as a stock-based award. The cash-equivalent RSU awards vest pro-rata over four years from the date of grant. The cash-equivalent performance-based awards vest after a three-year performance period. As the cash-equivalent awards are settled in cash, the Company establishes a liability equal to the product of the fair market value of Allied World Switzerland’s common shares as of the end of the reporting period and the total awards outstanding. At December 31, 2012 the liability was $36,454. The liability is included in “accounts payable and accrued expenses” in the balance sheets and changes in the liability are recorded in “general and administrative expenses” in the consolidated income statements.

e) Total Stock Related Compensation Expense

The following table shows the total stock related compensation expense relating to the stock options, RSUs, LTIP and cash equivalent awards.


	Year Ended December 31,
	2012		2011		2010
Stock Options	$	4,256	$	4,098	$	2,953
RSUs and performance-based equity awards		13,010		13,140		13,473
LTIP(1)		376		5,056		17,817
Cash-equivalent stock awards		32,760		20,295		15,132

Total	$	50,402	$	42,589	$	49,375

(1)	Includes $2,194, $3,219 and $932 related to the Darwin LTIP for the years ended December 31, 2012, 2011 and 2010, respectively.

F-40

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

f) Employee Share Purchase Plan

Under the Allied World Assurance Company Holdings, AG Amended and Restated 2008 Employee Share Purchase Plan (“ESPP”), eligible employees of the Company may purchase common shares of the Company at a 15% discount from the fair market value of one common share on the last trading day of each offering period. Employees purchase a variable number of common shares through payroll deductions elected as of the beginning of the offering period. The Company may sell up to 1,000,000 common shares to eligible employees under the ESPP.

13. EARNINGS PER SHARE

The following table sets forth the comparison of basic and diluted earnings per share:


	Year Ended December 31,
	2012		2011		2010
Basic earnings per share:
Net income	$	493,007	$	274,548	$	665,005
Weighted average common shares outstanding		36,057,145		38,093,351		46,491,279

Basic earnings per share	$	13.67	$	7.21	$	14.30


	Year Ended December 31,
	2012		2011		2010
Diluted earnings per share:
Net income	$	493,007	$	274,548	$	665,005
Weighted average common shares outstanding		36,057,145		38,093,351		46,491,279
Share equivalents:
Warrants and options		435,334		387,549		1,668,262
RSU and LTIP awards		575,755		1,185,764		1,753,395
Employee share purchase plan		1,651		1,241		381

Weighted average common shares and common share equivalents outstanding — diluted		37,069,885		39,667,905		49,913,317

Diluted earnings per share	$	13.30	$	6.92	$	13.32

For the years ended December 31, 2012, 2011 and 2010, a weighted average of 226,104, 698,672 and 452,354 employee stock options and RSUs were considered anti-dilutive and were therefore excluded from the calculation of the diluted earnings per share, respectively.

F-41

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

14. COMMITMENTS AND CONTINGENCIES

a) Concentrations of Credit Risk

Credit risk arises out of the failure of a counterparty to perform according to the terms of the contract.

The Company’s investment portfolio is managed pursuant to guidelines that follow prudent standards of diversification. The guidelines limit the allowable holdings of a single issue and issuers. The Company believes that there are no significant concentrations of credit risk associated with its investment portfolio. As of December 31, 2012 and 2011, substantially all of the Company’s cash and investments were held with one custodian.

Insurance balances receivable primarily consist of net premiums due from insureds and reinsureds and reinsurance funds held balances. The Company believes that the counterparties to these receivables are able to meet, and will meet, all of their obligations. The Company’s credit risk is further reduced by the contractual right to offset loss obligations or unearned premiums against premiums receivable. Consequently, the Company has not included any material allowance for doubtful accounts against the receivable balance. At December 31, 2012, insurance balances receivable included $322,153 receivable from a single counterparty for net premiums and funds held balances.

b) Operating Leases

The Company leases office space under operating leases expiring in various years through 2022. The following are future minimum rental payments as of December 31, 2012:


	Amount
2013	$	11,163
2014		10,541
2015		8,711
2016		7,986
2017		7,402
2018 through 2022		20,078

	$	65,881

Total rent expense for the years ended December 31, 2012, 2011 and 2010 was $11,929, $12,807 and $13,750, respectively. During the year ended December 31, 2010, the Company terminated one of its office leases and recognized a termination fee of $1,128.

c) Producers

The three largest individual producers as a percentage of gross premiums written are as follows:


	Year Ended December 31,
	2012			2011			2010
Marsh & McLennan Companies, Inc.		25	%		23	%		24	%
Aon Corporation (including Benfield Group Ltd.)		19	%		21	%		20	%
Willis Group Holdings		11	%		11	%		9	%

F-42

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

d) Legal Proceedings

The Company, in common with the insurance industry in general, is subject to litigation and arbitration in the normal course of its business. These legal proceedings generally relate to claims asserted by or against the Company in the ordinary course of insurance or reinsurance operations. Estimated amounts payable under these proceedings are included in the reserve for losses and loss expenses in the Company’s consolidated balance sheets. As of December 31, 2012, the Company was not a party to any material legal proceedings arising outside the ordinary course of business that management believes will have a material adverse effect on the Company’s results of operations, financial position or cash flow.

15. STATUTORY CAPITAL AND SURPLUS

Allied World Switzerland’s ability to pay dividends is subject to certain regulatory restrictions on the payment of dividends by its subsidiaries. The payment of such dividends is limited by applicable laws and statutory requirements of the jurisdictions in which Allied World Switzerland and its subsidiaries operate. The total amount of restricted net assets for the Company’s consolidated subsidiaries as of December 31, 2012 was $2,499,863.

The minimum required statutory capital and surplus is the amount of statutory capital and surplus necessary to satisfy regulatory requirements based on the Company’s current operations. The statutory capital and surplus and minimum required statutory capital and surplus for the Company’s most significant regulatory jurisdictions at December 31, 2012 and 2011 were as follows:


	2012				2011
	Statutory Capital and Surplus		Minimum Required Statutory Capital and Surplus		Statutory Capital and Surplus		Minimum Required Statutory Capital and Surplus
Bermuda	$	3,272,786	$	718,344	$	3,184,294	$	591,050
United States		1,110,468		173,078		1,054,441		146,284
Ireland		412,480		19,513		403,156		22,057
Switzerland		174,259		19,945		57,195		19,949
United Kingdom		224,854		224,531		91,000		90,500

There were no state-prescribed or permitted regulatory accounting practices for any of our insurance entities that resulted in reported statutory surplus that differed from that which would have been reported under the prescribed practices of the respective regulatory authorities, including the National Association of Insurance Commissioners. Statutory accounting under the prescribed practices of the respective regulatory authorities differs from U.S. GAAP accounting in the treatment of various items, including reporting of investments, acquisition costs and deferred income taxes.

The statutory net income (loss) for the Company’s most significant regulatory jurisdictions for December 31, 2012, 2011 and 2010 was as follows:


	2012		2011			2010
Bermuda	$	528,712	$	197,624		$	666,372
United States		25,390		44,974			63,304
Ireland		9,325		14,590			9,378
Switzerland		10,657		(637	)		N/A
United Kingdom		1,800		(10,320	)		290

F-43

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

At December 31, 2012, the maximum amount of ordinary dividends or distributions that can be paid, without prior regulatory approval, for the Company’s most significant regulatory jurisdictions, were as follows:


	2012
Bermuda	$	818,196
United States		86,849
Ireland		31,260
Switzerland		8,276
United Kingdom		—

a) Bermuda

The Company’s Bermuda subsidiary, Allied World Assurance Company, Ltd, is registered under the Bermuda Insurance Act 1978 and Related Regulations as amended. As a Class 4 insurer, Allied World Assurance Company, Ltd is required to maintain minimum solvency standards and to hold available statutory capital and surplus equal to or exceeding the enhanced capital requirements as determined by the Bermuda Monetary Authority under the Bermuda Solvency Capital Requirement model (“BSCR model”). The BSCR model is a risk-based capital model that provides a method for determining an insurer’s minimum required capital taking into account the risk characteristics of different aspects of the company’s business. In addition, this subsidiary is required to maintain a minimum liquidity ratio. As of December 31, 2012 and 2011, this subsidiary met the requirements.

b) United States

The Company’s U.S. insurance subsidiaries are subject to the insurance laws and regulations of the states in which they are domiciled, and also states in which they are licensed or authorized to transact business. These laws also restrict the amount of dividends the subsidiaries can pay to the Company. The restrictions are generally based on statutory net income and/or certain levels of statutory surplus as determined in accordance with the relevant statutory accounting requirements of the individual domiciliary states. The U.S. subsidiaries are required to file annual statements with insurance regulatory authorities prepared on an accounting basis prescribed or permitted by such authorities. The U.S. subsidiaries are also required to maintain minimum levels of solvency and liquidity as determined by law, and comply with capital requirements and licensing rules. As of December 31, 2012 and 2011, the actual levels of solvency, liquidity and capital of each U.S. subsidiary were in excess of the minimum levels required.

c) Ireland

The Company’s Irish insurance and reinsurance subsidiaries are regulated by the Central Bank of Ireland pursuant to the Insurance Acts 1909 to 2000, the Central Bank and Financial Services Authority of Ireland Acts 2003 and 2004 and all statutory instruments relating to insurance made or adopted under the European Communities Acts 1972 to 2009 (the “Irish Insurance Acts and Regulations”). These subsidiaries are required to maintain a minimum level of capital. As of December 31, 2012 and 2011, these subsidiaries met the requirements. The amount of dividends that these subsidiaries are permitted to distribute is restricted to accumulated realized profits that have not been capitalized or distributed, less accumulated realized losses that have not been written off. The solvency and capital requirements must still be met following any distribution.

d) Switzerland

The Company’s Swiss insurance subsidiary, Allied World Assurance Company, AG, is regulated by the Swiss Financial Market Supervisory Authority (“FINMA”) pursuant to the Insurance Supervisory Law 2004 to

F-44

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

2006. This subsidiary’s accounts are prepared in accordance with the Swiss Code of Obligation 1911 to 2012 and the Insurance Supervisory Law 2004 to 2006. This subsidiary is obligated to maintain a minimum level of capital based on the Swiss Code of Obligation, a minimum of tied assets based on the Insurance Supervisory Law and a minimum solvency margin based on the Solvency I and Swiss Solvency Test regulations as stipulated by the Insurance Supervisory Law. As of December 31, 2012 and 2011, this subsidiary met the requirements. The amount of dividends that this subsidiary is permitted to distribute is restricted to freely distributable reserves which consist of retained earnings, the current year profit and legal reserves to a certain extent. Any dividend requires approval of the shareholders and in case of the dividend exceeding the current year profit, approval is also required from FINMA. The solvency and capital requirements must still be met following any distribution.

e) United Kingdom

Allied World Capital (Europe) Limited is the sole corporate member of Syndicate 2232. Syndicate 2232 is managed by Capita Managing Agency Limited, an unaffiliated entity (“Capita”). As a member of Lloyd’s, Allied World Capital (Europe) Limited is obliged to comply with Lloyd’s bye laws and regulations (made pursuant to the Lloyd’s Acts 1871 to 1982) and applicable provisions of the Financial and Services and Markets Act 2000 (the “FSMA”). The Council of Lloyd’s has wide discretionary powers to regulate members’ underwriting at Lloyd’s and its exercise of these powers might affect the return on an investment of the corporate member in a given underwriting year. The capital required to support a Syndicate’s underwriting capacity, referred to as “funds at Lloyd’s”, is assessed annually and is determined by Lloyd’s in accordance with the capital adequacy rules established by the FSA. If a member of Lloyd’s is unable to pay its debts to policyholders, such debts may be payable from the Lloyd’s Central Fund, which in many respects acts as an equivalent to a state guaranty fund in the United States. The Company has provided capital to support the underwriting of Syndicate 2232 in the form of a letter of credit. The amount which the Company provides as funds at Lloyd’s is not available for distribution to the Company for the payment of dividends. Lloyd’s is authorized by the FSA and required to implement certain rules prescribed by the FSA under the Lloyd’s Act of 1982 regarding the operation of the Lloyd’s market. With respect to managing agents and corporate members, Lloyd’s prescribes certain minimum standards relating to management and control, solvency and other requirements and monitors managing agents’ compliance with such standards.

f) Branch Offices

The Company’s insurance subsidiaries maintain branch offices in Bermuda, England, Switzerland, Hong Kong, Canada, Singapore and Labuan. As branch offices are not considered separate legal entities, the required and actual statutory capital and surplus amounts for each jurisdiction in the table above include amounts related to the branch offices. These branch offices are subject to additional minimum capital or asset requirements in their countries of domicile. At December 31, 2012 and 2011, the actual capital and surplus for each of these branches exceeded the relevant local regulatory requirements.

16. SEGMENT INFORMATION

The determination of reportable segments is based on how senior management monitors the Company’s underwriting operations. Management monitors the performance of its direct underwriting operations based on the geographic location of the Company’s offices, the markets and customers served and the type of accounts written. The Company is currently organized into three operating segments: U.S. insurance, international insurance and reinsurance. All product lines fall within these classifications.

The U.S. insurance segment includes the Company’s direct specialty insurance operations in the United States. This segment provides both direct property and specialty casualty insurance primarily to non-Fortune 1000 North American domiciled accounts. The international insurance segment includes the Company’s direct

F-45

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

insurance operations in Bermuda, Europe, Singapore and Hong Kong. This segment provides both direct property and casualty insurance primarily to Fortune 1000 North American domiciled accounts from the Bermuda office and non-North American domiciled accounts from the European, Singapore and Hong Kong offices. The reinsurance segment includes the Company’s reinsurance operations in the U.S., Bermuda, Europe and Asia. This segment provides reinsurance of property, general casualty, professional liability, specialty lines and property catastrophe coverages written by insurance companies. The Company presently writes reinsurance on both a treaty and a facultative basis, targeting several niche reinsurance markets.

Responsibility and accountability for the results of underwriting operations are assigned by major line of business within each segment. Because the Company does not manage its assets by segment, investment income, interest expense and total assets are not allocated to individual reportable segments. General and administrative expenses are allocated to segments based on various factors, including staff count and each segment’s proportional share of gross premiums written.

Management measures results for each segment on the basis of the “loss and loss expense ratio,” “acquisition cost ratio,” “general and administrative expense ratio” and the “combined ratio.” The “loss and loss expense ratio” is derived by dividing net losses and loss expenses by net premiums earned. The “acquisition cost ratio” is derived by dividing acquisition costs by net premiums earned. The “general and administrative expense ratio” is derived by dividing general and administrative expenses by net premiums earned. The “combined ratio” is the sum of the “loss and loss expense ratio,” the “acquisition cost ratio” and the “general and administrative expense ratio.”

The following tables provide a summary of the segment results:


Year Ended December 31, 2012	U.S. Insurance			International Insurance			Reinsurance			Total
Gross premiums written	$	993,918		$	575,103		$	760,250		$	2,329,271
Net premiums written		743,428			346,348			748,047			1,837,823
Net premiums earned		671,594			336,787			740,517			1,748,898
Net losses and loss expenses		(465,168	)		(163,130	)		(510,966	)		(1,139,264	)
Acquisition costs		(86,670	)		486			(119,538	)		(205,722	)
General and administrative expenses		(141,729	)		(91,867	)		(73,725	)		(307,321	)

Underwriting (loss) income		(21,973	)		82,276			36,288			96,591
Net investment income											167,141
Net realized investment gains											306,436
Amortization of intangible assets											(2,533	)
Interest expense											(55,405	)
Foreign exchange loss											(783	)

Income before income taxes										$	511,447

Loss and loss expense ratio		69.3	%		48.4	%		69.0	%		65.1	%
Acquisition cost ratio		12.9	%		(0.1	%)		16.1	%		11.8	%
General and administrative expense ratio		21.1	%		27.3	%		10.0	%		17.6	%

Combined ratio		103.3	%		75.6	%		95.1	%		94.5	%

F-46

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)


Year Ended December 31, 2011	U.S. Insurance			International Insurance			Reinsurance			Total
Gross premiums written	$	838,567		$	530,450		$	570,504		$	1,939,521
Net premiums written		639,196			325,094			569,476			1,533,766
Net premiums earned		584,303			317,006			555,683			1,456,992
Net losses and loss expenses		(387,099	)		(206,593	)		(365,464	)		(959,156	)
Acquisition costs		(74,976	)		2,781			(95,100	)		(167,295	)
General and administrative expenses		(124,434	)		(84,290	)		(62,932	)		(271,656	)

Underwriting (loss) income		(2,206	)		28,904			32,187			58,885
Net investment income											195,948
Net realized investment gains											10,077
Other income—termination fee											101,744
Amortization of intangible assets											(2,978	)
Interest expense											(54,989	)
Foreign exchange loss											(3,159	)

Income before income taxes										$	305,528

Loss and loss expense ratio		66.2	%		65.2	%		65.8	%		65.8	%
Acquisition cost ratio		12.8	%		(0.9	%)		17.1	%		11.5	%
General and administrative expense ratio		21.3	%		26.6	%		11.3	%		18.6	%

Combined ratio		100.3	%		90.9	%		94.2	%		95.9	%


Year Ended December 31, 2010	U.S. Insurance			International Insurance			Reinsurance			Total
Gross premiums written	$	729,267		$	504,937		$	524,193		$	1,758,397
Net premiums written		551,063			319,083			522,309			1,392,455
Net premiums earned		518,444			338,791			502,313			1,359,548
Other income		913			—			—			913
Net losses and loss expenses		(297,517	)		(160,153	)		(250,213	)		(707,883	)
Acquisition costs		(67,797	)		460			(92,152	)		(159,489	)
General and administrative expenses		(128,556	)		(94,226	)		(63,775	)		(286,557	)

Underwriting income		25,487			84,872			96,173			206,532
Net investment income											244,143
Net realized investment gains											285,612
Net impairment charges recognized in earnings											(168	)
Amortization of intangible assets											(3,483	)
Interest expense											(40,242	)
Foreign exchange loss											(444	)

Income before income taxes										$	691,950

Loss and loss expense ratio		57.4	%		47.3	%		49.8	%		52.1	%
Acquisition cost ratio		13.1	%		(0.1	%)		18.3	%		11.7	%
General and administrative expense ratio		24.8	%		27.8	%		12.7	%		21.1	%

Combined ratio		95.3	%		75.0	%		80.8	%		84.9	%

F-47

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

The following table shows an analysis of the Company’s gross premiums written by geographic location of the Company’s subsidiaries. All intercompany premiums have been eliminated.


	Year Ended December 31,
	2012		2011		2010
United States	$	1,360,190	$	1,080,134	$	993,486
Bermuda		611,382		565,801		545,560
Europe		228,791		210,435		193,000
Singapore		111,694		68,382		17,059
Hong Kong		17,214		14,769		9,292

Total gross premiums written	$	2,329,271	$	1,939,521	$	1,758,397

Gross premiums written attributable to Switzerland were $43,664, $37,990 and $27,597 for the years ended December 31, 2012, 2011 and 2010, respectively.

17. OTHER INCOME

In late 2011, the Company reached a mutual agreement with Transatlantic Holdings, Inc. to terminate the previously announced merger agreement. Under the terms of the termination agreement, the Company received termination fees (net of expenses) of $101,744, which have been included within “Other income” on the consolidated income statements.

18. CONDENSED CONSOLIDATED PARENT COMPANY AND GUARANTOR FINANCIAL STATEMENTS

The following tables present condensed consolidating financial information as of December 31, 2012 and 2011 and for the years ended December 31, 2012, 2011 and 2010 for Allied World Switzerland (the “Parent Guarantor”) and Allied World Bermuda (the “Subsidiary Issuer”). The Subsidiary Issuer is a direct 100%-owned subsidiary of the Parent Guarantor. Investments in subsidiaries are accounted for by the Parent Guarantor under the equity method for purposes of the supplemental consolidating presentation. Earnings of subsidiaries are reflected in the Parent Guarantor’s investment accounts and earnings. The Parent Guarantor fully and unconditionally guarantees the senior notes issued by the Subsidiary Issuer.

F-48

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

Condensed Consolidating Balance Sheet:


As of December 31, 2012	Allied World Switzerland (Parent Guarantor)			Allied World Bermuda (Subsidiary Issuer)			Other Allied World Subsidiaries		Consolidating Adjustments			Allied World Switzerland Consolidated
ASSETS:
Investments	$	—		$	—		$	7,933,937	$	—		$	7,933,937
Cash and cash equivalents		19,997			11,324			650,558		—			681,879
Insurance balances receivable		—			—			846,900		—			846,900
Reinsurance recoverable		—			—			1,141,110		—			1,141,110
Net deferred acquisition costs		—			—			108,010		—			108,010
Goodwill and intangible assets		—			—			319,741		—			319,741
Balances receivable on sale of investments		—			—			418,879		—			418,879
Investments in subsidiaries		3,337,446			4,768,769			—		(8,106,215	)		—
Due (to) from subsidiaries		(23,864	)		(7,173	)		31,037		—			—
Other assets		1,499			6,081			571,910		—			579,490

Total assets	$	3,335,078		$	4,779,001		$	12,022,082	$	(8,106,215	)	$	12,029,946


LIABILITIES:
Reserve for losses and loss expenses	$	—		$	—		$	5,645,549	$	—		$	5,645,549
Unearned premiums		—			—			1,218,021		—			1,218,021
Reinsurance balances payable		—			—			136,264		—			136,264
Balances due on purchases of investments		—			—			759,934		—			759,934
Senior notes		—			798,215			—		—			798,215
Other liabilities		8,743			17,727			119,158		—			145,628

Total liabilities		8,743			815,942			7,878,926		—			8,703,611

Total shareholders’ equity		3,326,335			3,963,059			4,143,156		(8,106,215	)		3,326,335

Total liabilities and shareholders’ equity	$	3,335,078		$	4,779,001		$	12,022,082	$	(8,106,215	)	$	12,029,946

F-49

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)


As of December 31, 2011	Allied World Switzerland (Parent Guarantor)			Allied World Bermuda (Subsidiary Issuer)			Other Allied World Subsidiaries		Consolidating Adjustments			Allied World Switzerland Consolidated
ASSETS:
Investments	$	—		$	—		$	7,406,594	$	—		$	7,406,594
Cash and cash equivalents		112,672			8,886			512,438		—			633,996
Insurance balances receivable		—			—			652,158		—			652,158
Reinsurance recoverable		—			—			1,002,919		—			1,002,919
Net deferred acquisition costs		—			—			100,334		—			100,334
Goodwill and intangible assets		—			—			322,274		—			322,274
Balances receivable on sale of investments		—			—			580,443		—			580,443
Investments in subsidiaries		3,064,066			3,964,585			—		(7,028,651	)		—
Due (to) from subsidiaries		(4,853	)		(6,769	)		11,622		—			—
Other assets		1,504			6,367			415,569		—			423,440

Total assets	$	3,173,389		$	3,973,069		$	11,004,351	$	(7,028,651	)	$	11,122,158


LIABILITIES:
Reserve for losses and loss expenses	$	—		$	—		$	5,225,143	$	—		$	5,225,143
Unearned premiums		—			—			1,078,412		—			1,078,412
Reinsurance balances payable		—			—			124,539		—			124,539
Balances due on purchases of investments		—			—			616,728		—			616,728
Senior notes		—			797,949			—		—			797,949
Other liabilities		24,367			17,688			88,310		—			130,365

Total liabilities		24,367			815,637			7,133,132		—			7,973,136

Total shareholders’ equity		3,149,022			3,157,432			3,871,219		(7,028,651	)		3,149,022

Total liabilities and shareholders’ equity	$	3,173,389		$	3,973,069		$	11,004,351	$	(7,028,651	)	$	11,122,158

F-50

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

Condensed Consolidating Income Statement:


Year Ended December 31, 2012	Allied World Switzerland (Parent Guarantor)			Allied World Bermuda (Subsidiary Issuer)			Other Allied World Subsidiaries			Consolidating Adjustments			Allied World Switzerland Consolidated
Net premiums earned	$	—		$	—		$	1,748,898		$	—		$	1,748,898
Net investment income		26			20			167,095			—			167,141
Net realized investment gains		—			—			306,436			—			306,436
Net losses and loss expenses		—			—			(1,139,264	)		—			(1,139,264	)
Acquisition costs		—			—			(205,722	)		—			(205,722	)
General and administrative expenses		(35,258	)		(2,973	)		(269,090	)		—			(307,321	)
Amortization of intangible assets		—			—			(2,533	)		—			(2,533	)
Interest expense		—			(55,405	)		—			—			(55,405	)
Foreign exchange gain (loss)		159			(319	)		(623	)		—			(783	)
Income tax (expense) benefit		358			—			(18,798	)		—			(18,440	)
Equity in earnings of consolidated subsidiaries		527,722			573,256			—			(1,100,978	)		—

NET INCOME (LOSS)	$	493,007		$	514,579		$	586,399		$	(1,100,978	)	$	493,007

Unrealized gains on investments arising during the year net of applicable deferred income tax benefit of $265		(493	)		—			(493	)		493			(493	)
Reclassification adjustment for net realized investment gains included in net income, net of applicable income tax		(13,991	)		—			(13,991	)		13,991			(13,991	)

Other comprehensive loss		(14,484	)		—			(14,484	)		14,484			(14,484	)

COMPREHENSIVE INCOME (LOSS)	$	478,523		$	514,579		$	571,915		$	(1,086,494	)	$	478,523

F-51

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)


Year Ended December 31, 2011	Allied World Switzerland (Parent Guarantor)			Allied World Bermuda (Subsidiary Issuer)			Other Allied World Subsidiaries			Consolidating Adjustments			Allied World Switzerland Consolidated
Net premiums earned	$	—		$	—		$	1,456,992		$	—		$	1,456,992
Net investment income		64			26			195,858			—			195,948
Net realized investment gains		—			(53,620	)		10,077			53,620			10,077
Other income		101,744			—			—			—			101,744
Net losses and loss expenses		—			—			(959,156	)		—			(959,156	)
Acquisition costs		—			—			(167,295	)		—			(167,295	)
General and administrative expenses		(13,354	)		(5,823	)		(252,479	)		—			(271,656	)
Amortization of intangible assets		—			—			(2,978	)		—			(2,978	)
Interest expense		—			(54,989	)		—			—			(54,989	)
Foreign exchange gain (loss)		9			(978	)		(2,190	)		—			(3,159	)
Income tax (expense) benefit		(7,940	)		—			(23,040	)		—			(30,980	)
Equity in earnings of consolidated subsidiaries		194,025			309,920			—			(503,945	)		—

NET INCOME (LOSS)	$	274,548		$	194,536		$	255,789		$	(450,325	)	$	274,548

Unrealized gains on investments arising during the year net of applicable deferred income tax expense of $3,035		5,243			—			5,243			(5,243	)		5,243
Reclassification adjustment for net realized investment gains included in net income, net of applicable income tax		(47,894	)		—			(47,894	)		47,894			(47,894	)

Other comprehensive loss		(42,651	)		—			(42,651	)		42,651			(42,651	)

COMPREHENSIVE INCOME (LOSS)	$	231,897		$	194,536		$	213,138		$	(407,674	)	$	231,897

F-52

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)


Year Ended December 31, 2010	Allied World Switzerland (Parent Guarantor)			Allied World Bermuda (Subsidiary Issuer)			Other Allied World Subsidiaries			Consolidating Adjustments			Allied World Switzerland Consolidated
Net premiums earned	$	—		$	—		$	1,359,548		$	—		$	1,359,548
Net investment income		16			77			244,050			—			244,143
Net realized investment gains (loss)		—			(3,958	)		289,570			—			285,612
Net impairment charges recognized in earnings		—			—			(168	)		—			(168	)
Other income		—			—			913			—			913
Net losses and loss expenses		—			—			(707,883	)		—			(707,883	)
Acquisition costs		—			—			(159,489	)		—			(159,489	)
General and administrative expenses		(2,175	)		(15,031	)		(269,351	)		—			(286,557	)
Amortization of intangible assets		—			—			(3,483	)		—			(3,483	)
Interest expense		—			(40,242	)		—			—			(40,242	)
Foreign exchange gain (loss)		7			524			(975	)		—			(444	)
Income tax (expense) benefit		—			—			(26,945	)		—			(26,945	)
Equity in earnings of consolidated subsidiaries		667,157			725,787			—			(1,392,944	)		—

NET INCOME (LOSS)	$	665,005		$	667,157		$	725,787		$	(1,392,944	)	$	665,005

Unrealized gains on investments arising during the year net of applicable deferred income tax expense of $10,209		162,653			—			162,653			(162,653	)		162,653
Reclassification adjustment for net realized investment gains included in net income, net of applicable income tax		(213,478	)		—			(213,478	)		213,478			(213,478	)

Other comprehensive loss		(50,825	)		—			(50,825	)		50,825			(50,825	)

COMPREHENSIVE INCOME (LOSS)	$	614,180		$	667,157		$	674,962		$	(1,342,119	)	$	614,180

F-53

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

Condensed Consolidating Statement of Cash Flows:


Year Ended December 31, 2012	Allied World Switzerland (Parent Guarantor)			Allied World Bermuda (Subsidiary Issuer)		Other Allied World Subsidiaries			Consolidating Adjustments			Allied World Switzerland Consolidated
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES	$	338,565		$	2,438	$	287,853		$	—		$	628,856

CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases trading securities		—			—		(8,006,237	)		—			(8,006,237	)
Purchases of other invested assets		—			—		(333,031	)		—			(333,031	)
Sales of available for sale securities		—			—		236,978			—			236,978
Sales of trading securities		—			—		7,892,907			—			7,892,907
Sales of other invested assets		—			—		53,741			—			53,741
Capital contribution to subsidiary		(110,000	)		—		—			110,000			—
Other		—			—		(104,091	)		—			(104,091	)

Net cash provided by (used in) investing activities		(110,000	)		—		(259,733	)		110,000			(259,733	)

CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Partial par value reduction		(67,825	)		—		—			—			(67,825	)
Proceeds from the exercise of stock options		10,527			—		—			—			10,527
Share repurchases		(263,942	)		—		—			—			(263,942	)
Capital contribution from parent		—			—		110,000			(110,000	)		—

Net cash provided by (used in) financing activities		(321,240	)		—		110,000			(110,000	)		(321,240	)

NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		(92,675	)		2,438		138,120			—			47,883
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR		112,672			8,886		512,438			—			633,996

CASH AND CASH EQUIVALENTS, END OF YEAR	$	19,997		$	11,324	$	650,558		$	—		$	681,879

F-54

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)


Year Ended December 31, 2011	Allied World Switzerland (Parent Guarantor)			Allied World Bermuda (Subsidiary Issuer)			Other Allied World Subsidiaries			Consolidating Adjustments		Allied World Switzerland Consolidated
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:	$	87,592		$	(62,404	)	$	523,020		$	—	$	548,208

CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of available for sale securities		—			—			(727	)		—		(727	)
Purchases of trading securities		—			—			(7,854,053	)		—		(7,854,053	)
Purchases of other invested assets		—			—			(281,957	)		—		(281,957	)
Sales of available for sale securities		—			—			609,833			—		609,833
Sales of trading securities		—			—			6,942,291			—		6,942,291
Sales of other invested assets		—			—			71,543			—		71,543
Other		(4,496	)		—			8,442			—		3,946

Net cash provided by (used in) investing activities		(4,496	)		—			(504,628	)		—		(509,124	)

CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Partial par value reduction		(28,600	)		—			—			—		(28,600	)
Proceeds from the exercise of stock options		6,837			—			—			—		6,837
Share repurchases		(86,700	)		—			—			—		(86,700	)
Repurchase of founder warrants		—			(53,620	)		—			—		(53,620	)
Other		(449	)		(753	)		1,202			—		—

Net cash provided by (used in) financing activities		(108,912	)		(54,373	)		1,202			—		(162,083	)

NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		(25,816	)		(116,777	)		19,594			—		(122,999	)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR		138,488			125,663			492,844			—		756,995

CASH AND CASH EQUIVALENTS, END OF YEAR	$	112,672		$	8,886		$	512,438		$	—	$	633,996

F-55

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)


Year Ended December 31, 2010	Allied World Switzerland (Parent Guarantor)			Allied World Bermuda (Subsidiary Issuer)			Other Allied World Subsidiaries			Consolidating Adjustments			Allied World Switzerland Consolidated
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:	$	5,535		$	690,100		$	505,219		$	(750,000	)	$	450,854

CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of available for sale securities		—			—			(133,079	)		—			(133,079	)
Purchases of trading securities		—			—			(12,816,343	)		—			(12,816,343	)
Purchases of other invested assets		—			—			(165,505	)		—			(165,505	)
Sales of available for sale securities		—			—			2,687,129			—			2,687,129
Sales of trading securities		—			—			10,936,501			—			10,936,501
Sales of other invested assets		—			—			9,746			—			9,746
Other		—			(2,004	)		(16,382	)		—			(18,386	)

Net cash provided by (used in) investing activities		—			(2,004	)		502,067			—			500,063

CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Dividends paid		—			(47,712	)		(750,000	)		750,000			(47,712	)
Proceeds from the exercise of stock options		—			9,598			—			—			9,598
Proceeds from senior notes		—			296,682			—			—			296,682
Share repurchases		(27,047	)		(647,615	)		—			—			(674,662	)
Repurchase of founder warrants		—			(70,016	)		—			—			(70,016	)
Capital contribution		160,000			(160,000	)		—			—			—
Other		—			2,781			(2,781	)		—			—

Net cash provided by (used in) financing activities		132,953			(616,282	)		(752,781	)		750,000			(486,110	)

NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		138,488			71,814			254,505			—			464,807
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR		—			53,849			238,339			—			292,188

CASH AND CASH EQUIVALENTS, END OF YEAR	$	138,488		$	125,663		$	492,844		$	—		$	756,995

F-56

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)

Notes to Parent Company Condensed Financial Information

a) Basis of Presentation

In accordance with the requirements of Regulation S-X of the Securities and Exchange Commission, restricted net assets of the Company’s subsidiaries exceeded 25% of the Company’s total consolidated net assets.

b) Dividends

Allied World Switzerland received cash dividends from its subsidiaries of $355,000, $0 and $0 for the years ended December 31, 2012, 2011 and 2010, respectively.

19. UNAUDITED QUARTERLY FINANCIAL DATA

The following are the unaudited consolidated statements of income by quarter for the years ended December 31, 2012 and 2011:


	Quarter Ended
	December 31, 2012			September 30, 2012			June 30, 2012			March 31, 2012
REVENUES:
Gross premiums written	$	497,052		$	504,420		$	646,870		$	680,929
Premiums ceded		(134,429	)		(112,883	)		(152,160	)		(91,976	)

Net premiums written		362,623			391,537			494,710			588,953
Change in unearned premiums		113,621			49,480			(64,963	)		(187,063	)

Net premiums earned		476,244			441,017			429,747			401,890
Net investment income		38,360			39,121			42,451			47,209
Net realized investment gains		14,379			149,813			8,663			133,581

		528,983			629,951			480,861			582,680

EXPENSES:
Net losses and loss expenses		414,734			258,948			240,380			225,202
Acquisition costs		55,910			51,086			51,588			47,138
General and administrative expenses		84,404			78,572			73,979			70,366
Amortization of intangible assets		633			633			634			633
Interest expense		13,826			13,822			14,001			13,756
Foreign exchange loss (gain)		860			1,023			(1,019	)		(81	)

		570,367			404,084			379,563			357,014

(Loss) income before income taxes		(41,384	)		225,867			101,298			225,666
Income tax (benefit) expense		(237	)		6,220			4,947			7,510

NET (LOSS) INCOME	$	(41,147	)	$	219,647		$	96,351		$	218,156

PER SHARE DATA
Basic (loss) earnings per share	$	(1.17	)	$	6.16		$	2.66		$	5.86
Diluted (loss) earnings per share	$	(1.17	)	$	6.00		$	2.59		$	5.70
Weighted average common shares outstanding		35,097,043			35,652,768			36,288,596			37,205,166
Weighted average common shares and common share equivalents outstanding		35,097,043			36,616,734			37,189,722			38,284,635

F-57

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Expressed in thousands of United States dollars, except share, per share, percentage and ratio information)


	Quarter Ended
	December 31, 2011			September 30, 2011			June 30, 2011			March 31, 2011
REVENUES:
Gross premiums written	$	416,537		$	442,698		$	519,598		$	560,688
Premiums ceded		(109,705	)		(92,438	)		(123,795	)		(79,817	)

Net premiums written		306,832			350,260			395,803			480,871
Change in unearned premiums		88,637			21,080			(40,496	)		(145,995	)

Net premiums earned		395,469			371,340			355,307			334,876
Net investment income		45,489			47,883			52,368			50,208
Net realized investment gains		31,632			(130,809	)		58,878			50,376
Other income — termination fee		66,744			35,000			—			—

		539,334			323,414			466,553			435,460

EXPENSES:
Net losses and loss expenses		213,345			205,546			235,813			304,452
Acquisition costs		46,562			39,680			42,971			38,082
General and administrative expenses		70,492			66,007			67,201			67,956
Amortization of intangible assets		678			767			766			767
Interest expense		13,754			13,748			13,745			13,742
Foreign exchange (gain) loss		(549	)		2,966			1,184			(442	)

		344,282			328,714			361,680			424,557

Income (loss) before income taxes		195,052			(5,300	)		104,873			10,903
Income tax expense		11,952			5,672			11,073			2,283

NET INCOME (LOSS)	$	183,100		$	(10,972	)	$	93,800		$	8,620

PER SHARE DATA
Basic earnings (loss) per share	$	4.80		$	(0.29	)	$	2.45		$	0.23
Diluted earnings (loss) per share	$	4.63		$	(0.29	)	$	2.36		$	0.21
Weighted average common shares outstanding		38,138,558			38,110,368			38,346,489			38,199,867
Weighted average common shares and common share equivalents outstanding		39,524,273			38,110,368			39,800,753			40,383,523

F-58

Schedule III

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

SUPPLEMENTARY INSURANCE INFORMATION

(Expressed in thousands of United States dollars)


Year Ended December 31, 2012
	Net Deferred Acquisition Costs		Reserve for Losses and Loss Expenses		Unearned Premiums		Net Premiums Earned		Net Investment Income		Losses and Loss Expenses		Amortization of Deferred Acquisition Costs			Other Operating Costs		Net Premiums Written
U.S. insurance	$	43,137	$	1,898,241	$	562,302	$	671,594	$	—	$	465,168	$	86,670		$	141,729	$	743,428
International insurance		3,602		2,266,660		332,571		336,787		—		163,130		(486	)		91,867		346,348
Reinsurance		61,271		1,480,648		323,148		740,517		—		510,966		119,538			73,725		748,047
Corporate		—		—		—		—		167,141		—		—			—		—

Total	$	108,010	$	5,645,549	$	1,218,021	$	1,748,898	$	167,141	$	1,139,264	$	205,722		$	307,321	$	1,837,823


Year Ended December 31, 2011
	Net Deferred Acquisition Costs		Reserve for Losses and Loss Expenses		Unearned Premiums		Net Premiums Earned		Net Investment Income		Losses and Loss Expenses		Amortization of Deferred Acquisition Costs			Other Operating Costs		Net Premiums Written
U.S. insurance	$	37,028	$	1,662,480	$	467,392	$	584,303	$	—	$	387,099	$	74,976		$	124,434	$	639,196
International insurance		2,395		2,249,012		304,509		317,006		—		206,593		(2,781	)		84,290		325,094
Reinsurance		60,911		1,313,651		306,511		555,683		—		365,464		95,100			62,932		569,476
Corporate		—		—		—		—		195,948		—		—			—		—

Total	$	100,334	$	5,225,143	$	1,078,412	$	1,456,992	$	195,948	$	959,156	$	167,295		$	271,656	$	1,533,766


Year Ended December 31, 2010
	Net Deferred Acquisition Costs		Reserve for Losses and Loss Expenses		Unearned Premiums		Net Premiums Earned		Net Investment Income		Losses and Loss Expenses		Amortization of Deferred Acquisition Costs			Other Operating Costs		Net Premiums Written
U.S. insurance	$	32,778	$	1,431,707	$	392,787	$	518,444	$	—	$	297,517	$	67,797		$	128,556	$	551,063
International insurance		2,279		2,226,725		277,808		338,791		—		160,153		(460	)		94,226		319,083
Reinsurance		61,746		1,220,756		291,608		502,313		—		250,213		92,152			63,775		522,309
Corporate		—		—		—		—		244,143		—		—			—		—

Total	$	96,803	$	4,879,188	$	962,203	$	1,359,548	$	244,143	$	707,883	$	159,489		$	286,557	$	1,392,455

S-1

Schedule IV

ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG

SUPPLEMENTARY REINSURANCE INFORMATION

(Expressed in thousands of United States dollars)


Property and Casualty:	(a) Gross		(b) Ceded to Other Companies		(c) Assumed from Other Companies		(d) Net Amount (a) - (b) + (c)		Percentage of Amount Assumed to Net (c) / (d)
Year ended December 31, 2012	$	1,569,021	$	491,448	$	760,250	$	1,837,823	41%
Year ended December 31, 2011	$	1,369,017	$	405,755	$	570,504	$	1,533,766	37%
Year ended December 31, 2010	$	1,234,204	$	365,942	$	524,193	$	1,392,455	38%

S-2