(Mark One)

þ		ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED]

o		TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED]

A.

Full title of the plan and address of the plan, if different from that of the issuer named below:

B.

Name of issuer of the securities held pursuant to the plan and the address of its principal executive offices:

225 West Station Square Drive

Suite 700

Pittsburgh, Pennsylvania 15219-1122

 

 

WESCO Distribution, Inc.
Retirement Savings Plan
Financial Statements
December 29, 2008 and 2007

		Page(s)
Report of Independent Registered Public Accounting Firms			1-2
Financial Statements
Statements of Net Assets Available for Benefits as of December 29, 2008 and 2007			3
Statements of Changes in Net Assets Available for Benefits for the fiscal years ended December 29, 2008 and 2007			4
Notes to Financial Statements			5-13
Supplemental Schedule
Schedule H, line 4(i) — Schedule of Assets (Held at End of Year) as of December 29, 2008			14-42
Consents of Independent Registered Public Accounting Firms
EX-23.1
EX-23.2

To the Participants and Administrator
WESCO Distribution, Inc. Retirement Savings Plan
Pittsburgh, Pennsylvania

     We have audited the accompanying statement of net assets available for benefits of the WESCO Distribution, Inc. Retirement Savings Plan (the Plan) as of December 29, 2008, and the related statement of changes in net assets available for benefits for the year ended December 29, 2008.  These financial statements are the responsibility of the Plan’s management.  Our responsibility is to express an opinion on these financial statements based on our audit.

     We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States of America).  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 audit provides a reasonable basis for our opinion.

     In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for benefits of the Plan as of December 29, 2008, and the changes in net assets available for benefits for the year ended December 29, 2008 in conformity with accounting principles generally accepted in the United States of America.

     Our audit was performed for the purpose of forming an opinion on the basic financial statements taken as a whole.  The supplemental schedule of assets (held at end of year) is presented for the purpose of additional analysis and is not a required part of the basic financial statements but is supplementary information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974.  This supplemental schedule is the responsibility of the Plan’s management.  The supplemental schedule has been subjected to the auditing procedures applied in the audit of the basic financial statements and, in our opinion, is fairly stated in all material respects in relation to the basic financial statements taken as a whole.

/s/ Alpern Rosenthal
Pittsburgh, Pennsylvania
June 26, 2009

To the Participants and Administrator of
WESCO Distribution, Inc. Retirement Savings Plan

We have audited the accompanying statement of net assets available for plan benefits of WESCO Distribution, Inc. Retirement Savings Plan as of and for the year ending December 29, 2007, and the related statements of changes in net assets available for plan benefits for the year then ended. These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits. The statement of net assets available for plan benefits of WESCO Distribution, Inc. Retirement Savings Plan as of December 29, 2006, was audited by other auditors whose report, dated June 27, 2007, expressed an unqualified opinion of that statement.

We conducted our audit in accordance with 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 audit provides a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for plan benefits of the WESCO Distribution, Inc. Retirement Savings Plan as of December 29, 2007, and the changes in net assets available for plan benefits for the year then ended in conformity with accounting principles generally accepted in the United States of America.

Our audit was performed for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental schedule is presented for the purpose of additional analysis and is not a required part of the basic financial statements but is supplementary information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. This supplemental schedule is the responsibility of the Plan’s management. The supplemental schedule is the responsibility of Plan’s management. The supplemental schedule has been subjected to the auditing procedures applied in the audit of the basic financial statements for the year ended December 29, 2007 and, in our opinion, is fairly stated in all material respects in relation to the basic financial statements taken as a whole.

/s/ Freed Maxick & Battaglia, CPAs, PC
Buffalo, New York
June 26, 2008

		2008				2007
Investments at fair value (Notes 2, 4, 5, and 7)
Shares of registered investment companies		$	124,263,627			$	211,033,183
Common collective trusts			14,054,450				21,035,201
Stock funds and self-directed accounts			11,463,975				14,387,053
Stable Value Fund			105,930,357				89,577,909
RAFI Enhanced Large Company Fund			17,744,056				33,227,145
Participant loans			7,280,126				6,377,189
			280,736,591				375,637,680
Receivables
Employee contributions			876,896				889,851
Employer matching contributions			347,561				347,410
Employer discretionary contribution			8,803,031				7,533,707
Accrued interest			21,807				21,421
Net assets available for benefits at fair value			290,785,886				384,430,069
Adjustment from fair value to contract value for interest in the Stable Value Fund relating to fully benefit-responsive contracts (Note 7)			(2,617,033	)			(1,683,438	)
Net assets available for benefits		$	288,168,853			$	382,746,631

The accompanying notes are an integral part of these financial statements.

		2008				2007
Additions
Employee contributions		$	24,682,279			$	23,858,850
Employee rollovers			1,026,878				16,366,083
Employer matching and discretionary contributions			16,821,370				15,025,271
Net appreciation from shares of registered investment companies			—				9,539,881
Net appreciation from common collective trusts			—				1,237,911
Net appreciation from the Stable Value Fund			4,872,830				2,868,637
Interest and dividend income			7,904,455				16,803,050
Total additions			55,307,812				85,699,683
Deductions
Net depreciation from shares of registered investment companies			88,135,613				—
Net depreciation from common collective trusts			5,559,051				—
Net depreciation from stock funds and self-directed accounts			8,420,085				4,049,655
Net depreciation from the RAFI Enhanced Large Company Fund			12,558,099				487,288
Distributions to withdrawing participants			34,229,706				35,661,705
Administrative expenses			983,036				223,965
Total deductions			149,885,590				40,422,613
Net (decrease) increase			(94,577,778	)			45,277,070
Net assets available for benefits
Beginning of year			382,746,631				337,469,561
End of year		$	288,168,853			$	382,746,631

The accompanying notes are an integral part of these financial statements.

WESCO Distribution, Inc.
Retirement Savings Plan

1.

Major Features of the Plan

Background

WESCO Distribution, Inc. Retirement Savings Plan (the “Plan”) was established as of February 28, 1994 (date of inception). At the date of inception, certain employees of the predecessor company became employees of WESCO Distribution, Inc. (the “Company”) and participants in the Plan. At the date of inception, all funds held by the prior plans of the predecessor company related to the employees of the Company were transferred to the Plan.

The Plan is a participant-directed defined contribution plan covering certain employees of the Company and former employees with a fund balance of at least $5,000 who elected to maintain their funds in the Plan. Former employees cannot make contributions to the Plan.

Participation for eligible employees requires an employee to be scheduled to work at least 1,000 hours per year and requires an employee to be paid through the Plan sponsor’s payroll system.

As a result of the acquisition of Communications Supply Holdings, Inc. on November 3, 2006, approximately 800 participants were added to the Plan. These participants did not rollover their balances until 2007.

Contributions

The Plan is subject to the Employee Retirement Income Security Act of 1974, as amended (“ERISA”). Participants may elect to make tax deferred contributions ranging from 1% up to the lesser of 50% of their eligible compensation or $15,500. The $15,500 limit may be adjusted in future years by the Internal Revenue Service (“IRS”). The sum of the tax deferred contributions and the after-tax contributions cannot exceed 50% of the participant’s eligible compensation. Subject to limitation, the Company will make matching contributions in an amount equal to 50% of a participant’s total monthly contributions up to a maximum of 3% of their compensation.

The Plan includes a negative enrollment policy. Under this policy, if an individual does not submit an automatic enrollment waiver or elect a deferral rate, the employee will be automatically enrolled in the Plan at a 3% deferral rate. The deferral rate is increased by 1% each September 1 until the deferral rate equals 6%.

Participants who have attained age 50 before the close of the plan year are eligible to make catch-up contributions in addition to pre-tax contributions. A catch-up contribution is a pre-tax contribution that exceeds the annual deferral limit. A participant’s total catch-up contribution cannot exceed $5,000. The catch up contribution limits are determined by the IRS and then indexed for inflation after 2007. In addition to cash, in-kind contributions are permitted which may consist of stocks, bonds, property or other securities.

The Company also may, at the Board of Directors’ discretion, make a discretionary contribution to the Plan provided certain predetermined profit levels are attained. The Company made discretionary contributions of $8,803,031 and $7,533,707 for the Plan’s fiscal years ended December 29, 2008 and 2007, respectively.

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2008 and 2007

Vesting

Participants are fully vested in the value of their contributions and related investment income at all times and vest in their allocated share of employer matching and discretionary contributions according to the following table:

Less than two years of service			0	%
Two years of service			20	%
Three years of service			40	%
Four years of service			66	%
Five or more years of service			100	%

In conjunction with a leveraged recapitalization of the Company, all active employees as of June 5, 1998 became fully vested.

Forfeitures

Employer contributions forfeited by participants not vested at their termination date are used to reinstate previously forfeited account balances of former participants who have returned to employment with the Company, or to reduce employer contributions in accordance with the Plan’s provisions. Total forfeitures that reduced employer contributions in 2008 and 2007 were approximately $1,099,000 and $1,240,000, respectively. As of December 29, 2008, a balance of approximately $644,000 was available to reduce employer contributions in 2009.

Participant Accounts

An account is maintained for each participant, which is credited with the participant’s and the employer’s matching contributions and an allocation of employer’s discretionary contributions, plan earnings and administrative expenses. Allocations are based on participant contributions or account balances, as defined by the Plan. The benefit to which a participant is entitled is the benefit that can be provided from the participant’s vested account balance.

2.

Summary of Significant Accounting Policies

Accounting Principles

The financial statements of the Plan have been prepared in accordance with accounting principles generally accepted in the United States of America. The following are the significant accounting policies followed by the Plan:

Basis of Accounting

The accounting records of the Plan are maintained on the accrual basis of accounting.

Investment Valuation and Income Recognition

In September 2006, the Financial Accounting Standards Board (“FASB”) issued Statement of Accounting Standard No. 157, Fair Value Measurements (“SFAS 157”). SFAS 157 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements.  SFAS 157 applies to other accounting pronouncements that require or permit fair value measurements, but does not require any new fair value measurements. SFAS 157 covers financial assets and liabilities, as well as any other assets and liabilities that are carried at fair value on a recurring basis in financial statements.  SFAS 157 is effective for fiscal years beginning after November 15, 2007 for financial assets and liabilities, and for fiscal years beginning after November 15, 2008 for other nonfinancial assets and liabilities.  

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2008 and 2007

SFAS 157 defines fair value 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.  SFAS 157 establishes a fair value hierarchy that distinguishes between (i) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (ii) an entity’s own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs).

The three levels of the fair value hierarchy under SFAS 157 are described below:

	•		Level 1 – Observable inputs such as quoted prices in active markets that the Plan has the ability to access.
	•		Level 2 – Inputs include:

	1.		Quoted prices for similar assets or liabilities in active markets;
	2.		Quoted prices for identical or similar assets or liabilities in inactive markets;
	3.		Inputs, other than quoted prices in active markets, that are observable either directly or indirectly;
	4.		Inputs that are derived principally from, or corroborated by, observable market data by correlation or other means.

•

Level 3 – Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.

The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The valuation techniques are used to maximize the use of observable inputs and minimize the use of unobservable inputs.   

The adoption of SFAS 157 did not have an impact on the amounts recorded in the Plan’s financial statements and there was no cumulative impact recorded upon adoption.

Following is a description of the valuation methodologies used for assets measured at fair value. There have been no changes in the methodologies used as of December 29, 2008 and 2007.

	•		Common stocks, corporate bonds and U.S. government securities are valued at the closing price reported on the active market on which the individual securities are traded.
	•		Registered investment companies are valued at the net asset value of shares held by the Plan as of December 29.
	•		Collective investment trusts are valued at fair value by determining the price of the underlying investments. Equities listed on an exchange are valued at the latest quoted sales price of the exchange on which the security is primarily traded. Securities that are not traded on the valuation date or securities that are not listed on an exchange are valued at the latest bid price provided by the trust’s pricing service.

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2008 and 2007

	•		The Stable Value Fund (Note 7) is valued based on the underlying securities which include corporate bonds, commercial mortgage-backed securities and government securities.
	•		Participant loans are valued at cost, which approximates fair value.

The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values.  Furthermore, while the Plan believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement as of the reporting date.  

As described in FASB Staff Position, FSP AAG INV-1 and SOP 94-4-1, Reporting of Fully Benefit-Responsive Investment Contracts Held by Certain Investment Companies Subject to the AICPA Investment Company Guide and Defined-Contribution Health and Welfare and Pension Plans (the “FSP”), investment contracts held by a defined-contribution plan are required to be reported at fair value. However, contract value is the relevant measurement attribute for that portion of the net assets available for benefits of a defined-contribution plan attributable to fully benefit-responsive investment contracts, because contract value is the amount participants would receive if they were to initiate permitted transactions under the terms of the plan. As required by the FSP, the Statement of Net Assets Available for Benefits presents the fair value of the investment contracts as well as the adjustment of the fully benefit-responsive investment contracts from fair value to contract value. The Statement of Changes in Net Assets Available for Benefits is prepared on a contract value basis.

Purchases and sales of securities are recorded on a trade date basis. Dividends are recorded on the ex-dividend date. Interest income is recorded on an accrual basis.

Net Appreciation (Depreciation) in Value of Investments

The Plan presents in the statement of changes in net assets available for benefits the net appreciation (depreciation) in the fair value of its investments, consisting of realized gains (losses) and unrealized gains (losses) in the registered investment companies, common collective trusts, Stable Value Fund, RAFI Enhanced Large Company Fund, WESCO International stock and other common stocks.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make significant estimates and assumptions. These estimates may affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of additions and deductions during the reporting period. Actual results could differ from those estimates.

Risks and Uncertainties

The Plan provides for various investment options in any combination of stocks, bonds, fixed income securities and other investment securities. Investment securities are exposed to various risks, such as interest rate, market and credit risk. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, it is at least reasonably possible that changes in the near-term could materially affect (i)

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2008 and 2007

participants’ account balances, and (ii) the amounts reported in the (a) statements of net assets available for benefits and the (b) statements of changes in net assets available for benefits.

Other

All administrative expenses were paid by the Plan during 2008. Administrative expenses, excluding participant loan setup fees, distribution fees, hardship withdrawal fees and consulting fees, were paid by the Company and, therefore, were not expenses of the Plan during 2007.

Payment of Benefits

Benefits are recorded when paid.

3.

Tax Status

The IRS has determined and informed the Company by a letter dated October 15, 2003, that the Plan is designed in accordance with Section 401(a) of the Internal Revenue Code (“IRC”) and, therefore, is exempt from federal taxes under provisions of Section 501(a). Accordingly, no provision for income taxes has been included in the Plan’s financial statements. The Plan has been amended since receiving its determination letter. However, the Plan administrator and the Plan’s tax counsel believe the Plan is designed and is currently being operated in compliance with the applicable requirements of the IRC.

4.

Investments

The  following  table  sets  forth  by  level,  within  the  fair  value  hierarchy,  the  Plan’s  assets as of December 29, 2008:

		Level 1				Level 2				Level 3				Total
Shares of registered investment companies		$	124,263,627												124,263,627
Common collective trusts							14,054,450								14,054,450
Stock funds and self-directed accounts			11,463,975												11,463,975
Stable Value Fund							105,930,357								105,930,357
RAFI Enhanced Large Company Fund							17,744,056								17,744,056
Participant loans											7,280,126				7,280,126
		$	135,727,602				137,728,863				7,280,126				280,736,591

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2008 and 2007

The table below sets forth a summary of changes in the fair value of the Plan’s level 3 assets for the fiscal year ended December 29, 2008:  

		Participant Loans
Balance, beginning of year		$	6,377,189
Purchases, sales, issuances and settlements, net			902,937
Balance, end of year		$	7,280,126

Investments (at fair value) representing 5% or more of the net assets available for benefits as of December 29, 2008 and 2007 were as follows:

		2008				2007
AMCAP Fund (Class R-4)		$	22,432,077			$	39,609,971
American Balanced Fund (Class A)			27,656,522				37,193,165
Columbia Acorn Fund (Class A)			18,503,267				33,406,094
RiverSource Midcap Value Fund *			—				25,049,255
Stable Value Fund			105,930,357				89,577,909
Thornburg International Value Fund			16,854,808				33,139,769

5.

Participant Loans

Participants are permitted to borrow against a portion of their vested account balance, up to a maximum of $50,000 or 50% of their vested account balance, and pursuant to nondiscriminatory rules established by the Administrative Committee. Each loan is to be repaid over a period not to exceed five years.

The interest rate applied to participant loans is established each month by the Administrative Committee at 1% above the PNC Bank prime interest rate. The interest rate on loans outstanding ranged between 5.0% and 10.0% for the fiscal year ended December 29, 2008 (5% and 10.5% for the fiscal year ended December 29, 2007). Principal and interest payments are generally made through monthly payroll deductions and are credited to the participant’s individual account. Loans of approximately $4,274,000 and $4,025,000 were made from the Plan and loan principal repayments of approximately $3,264,000 and $2,459,000 were received by the Plan for the fiscal years ended December 29, 2008 and 2007, respectively. Interest on the loans of approximately $530,000 and $451,000 was earned by the Plan for the fiscal years ended December 29, 2008 and 2007, respectively.

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2008 and 2007

6.

Plan Termination

Although the Company has not expressed any intent to do so, it has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions of ERISA. In the event the Plan terminates, participants will become 100% vested in their accounts, and all vested assets shall be distributed to the participants in accordance with the terms of the Plan, or in such other manner, not inconsistent with the requirements of any applicable law or regulation, as the Company may in its sole discretion determine.

7.

The Stable Value Fund

During 2007, the Plan began investing in a fully benefit-responsive synthetic guaranteed interest contract (“GIC”) with an insurance company as part of offering the Stable Value Fund (the “Fund”) investment option to participants. Contributions to this Fund are used to purchase units of a collective trust vehicle which is invested in high-quality U.S. bonds, including U.S. government treasuries, corporate debt securities, and other high-credit-quality asset-backed securities. The GIC issuer is contractually obligated to repay the principal and a specified interest rate that is guaranteed to the Plan. There are no reserves against contact value for credit risk of the contract issuer or otherwise.

The Fund has entered into a wrap contract with an insurance company under which the insurance company provides a guarantee with respect to the availability of funds to make distributions from this investment option. This insurance contract is carried at contract value in the participants’ accounts.

Participant accounts in the Fund are credited with interest at a fixed rate that is reset quarterly based on an agreed-upon formula as defined in the contract. The primary variables which could impact the future interest rates that are credited to the participant’s accounts (“credited rates”) include (i) the amount and timing of participant contributions, (ii) transfers and withdrawals into/out of the contract, (iii) the current yield of the assets underlying the contract, (iv) the duration of the assets underlying the contract, and (v) the existing difference between fair value of the securities and the contract value of the assets within the insurance contract. The credited rate of security-backed contracts will track current market yields on a trailing basis. The rate reset feature allows the contract value to converge with the fair value of the underlying portfolio over time, assuming the portfolio continues to earn the current yield for a period of time equal to the current portfolio duration.

To the extent that the underlying portfolio has unrealized and/or realized losses, a positive adjustment is made when reconciling from fair value to contract value under contract value accounting. As a result, the future credited rate may be lower over time than the current market rates. Similarly, if the underlying portfolio generates unrealized and/or realized gains, a negative adjustment is made when reconciling from fair value to contract value, and in the future, the credited rate may be higher than the current market rates. The insurance contract cannot credit an interest rate that is less than zero percent.

Certain events limit the ability of the Plan to transact at contract value with the insurance company. Such events are limited to premature termination of the contract by the Plan or plan termination. The plan sponsor has not expressed any intention to take either of these actions.

As described in Note 2, because the synthetic GIC is fully benefit-responsive, contract value is the relevant measurement attribute for that portion of the net assets available for benefits attributable to the synthetic GICs. Participants may ordinarily direct the withdrawal or transfer of all or a portion of their investment at contract value. The average yields earned by the Fund as of December 29, 2008 and 2007 are as follows:

Average yield for synthetic GICs		2008				2007
Based on actual earnings			4.39	%			4.96	%
Based on interest rate credited to participants			4.59	%			5.05	%

8.

Related Party Transactions

Participants of the Plan may elect to invest in WESCO International, Inc. common stock within the WESCO Pooled Stock Fund. WESCO International, Inc. owns 100% of the Company. Therefore, these transactions qualify as party-in-interest transactions. Purchases and sales proceeds within the WESCO Pooled Stock Fund for 2008 were $4,414,000 and $2,305,000, respectively, and purchases and sales proceeds for 2007 were $4,542,000 and $5,535,000, respectively.

9.

Reconciliation of Financial Statements to Schedule H of form 5500

The adjustment from fair value to contract value for fully benefit-responsive investment contracts is not recorded on Schedule H of Form 5500.

The following is a reconciliation of net assets available for plan benefits per the financial statements at December 29, 2008 and 2007 to Form 5500:

		2008				2007
Net assets available for plan benefits per the financial statements		$	288,168,853			$	382,746,631
Add: Adjustment from contract value for interest in Stable Value Fund relating to fully benefit responsive investment contracts			2,617,033				1,683,438
Net assets available for plan benefits per Schedule H of Form 5500		$	290,785,886			$	384,430,069

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2008 and 2007

The following is a reconciliation of net appreciation (depreciation), interest, and dividends in fair value of investments per the financial statements for the years ended December 29, 2008 and 2007 to Schedule H of Form 5500:

		2008				2007
Net appreciation (depreciation), interest, and dividends per the financial statements		$	(101,895,563	)		$	25,912,536
Add: Adjustment from contract value for interest in Stable Value Fund relating to fully benefit responsive investment contracts			933,595				1,683,438
Add: Reclassifications to other expenses			—				106,337
Net appreciation (deprecation), interest, and dividends per Schedule H of Form 5500		$	(100,961,968	)		$	27,702,311

10.

Subsequent Event

On December 31, 2008, Wachovia Retirement Services, trustee of the Plan, was merged with Wells Fargo & Company.

WESCO Distribution, Inc.
Retirement Savings Plan

EIN 25-1723345, Plan Number 001 December 29, 2008		Schedule H, line 4i

(a)		(b)		(c)		(d)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,		Current
		Similar Party		Par, or Maturity Value		Value
		Alger Institutional Funds		Alger Midcap Growth Institutional Fund		$	5,108,796
		AMCAP Fund		AMCAP Fund (Class R-4)			22,432,077
		American Funds		American Balanced Fund (Class A)			27,656,522
		Columbia Mutual Funds		Columbia Acorn Fund (Class A)			18,503,267
		Loomis Sayles		Loomis Sayles Invest Grade Bond			11,393,486
		MFS Family of Funds		MFS Value Fund (Class A)			10,393,488
		RiverSource Trust		Midcap Value Fund Class R4			11,921,183
		Thornburg International		Thornburg International Value Fund			16,854,808
		Shares of Registered Investment Companies Total					124,263,627
		Manning & Napier Promix Funds		Manning & Napier Promix Conservative Trust			2,624,556
		Manning & Napier Promix Funds		Manning & Napier Promix Extended Trust			3,489,932
		Manning & Napier Promix Funds		Manning &Napier Promix Maximum Trust			5,105,102
		Manning & Napier Promix Funds		Manning & Napier Promix Moderate Trust			2,834,860
		Common Collective Trusts Total					14,054,450
*		WESCO International, Inc.		WESCO International Pooled Stock Fund			5,474,232
		Ameriprise Cash		Cash and cash equivalents			817,781
		ABB Ltd Adr		Common Stock			11,849
		Abitibibowater Inc		Common Stock			2,646
		ABN Amro		Veredus Aggressive Growth			128,547
		Activision Blizzard Inc.		Common Stock			581
		ADR Cemex		Common Stock			9,060
		AGL Resources		Common Stock			29,570
		Agnico Eagle Mines LTD		Common Stock			5,076
		Akami Technologies		Common Stock			11,560
		Alcatel-Lucent Ads		Common Stock			124
		Altria Group Inc.		Common Stock			5,058
		Ambac Financial Group		Common Stock			3,480
		American Beacon Funds		Large Cap Value Fund			4,743
		American Century		Diversified Bond Fund			284,258
		American Century Funds		Ginne Mae Fund			101,312
		American Century Funds		International Bond Fund			14,920
		American International Group		Common Stock			969
		Apple Inc.		Common Stock			43,218
		Applied Materials		Common Stock			951
		Arcadia Resources, Inc.		Common Stock			350
		Artisan Funds		International Investor Shrs			3,794
		AT&T Inc		Common Stock			2,786
		Atlas Pipeline Partners LP		Common Stock			1,512
		Authentec Inc		Common Stock			4,170
		Azteca Gold Corp		Common Stock			197
		B & G Foods Inc.		Common Stock			20,325
		Badger Meter Inc.		Common Stock			1,291

WESCO Distribution, Inc.
Retirement Savings Plan

EIN 25-1723345, Plan Number 001 December 29, 2008		Schedule H, line 4i

(a)		(b)		(c)		(d)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,		Current
		Similar Party		Par, or Maturity Value		Value
		Bank America Corp		Common Stock			14,234
		Barclays Bank Plc		Common Stock			3,437
		Bemis Co		Common Stock			6,698
		Benida Beverage Co.		Common Stock			2
		Berkshire Hathaway Inc.		Common Stock			9,264
		Bhp Billiton Ltp-Spon Adr		Common Stock			4,029
		Biotime Inc.		Common Stock			70
		Boardwalk Pipeline Partners		Common Stock			3,542
		Boeing Co.		Common Stock			11,997
		BP Plc		Common Stock			4,532
		BP Prudhoe Bay Royalty Trust		Common Stock			2,813
		Brandywine Funds		Blue Equity Fund			20,243
		Budget Group Inc.		Common Stock			13
		Burlington Northern Inc		Common Stock			1,459
		Cal-Marine Foods Inc.		Common Stock			2,063
		Calumet Specialty Products		Common Stock			2,981
		Canadian Zinc Corp		Common Stock			154
		Carbon Sciences Inc.		Common Stock			170
		Caterpillar Inc.		Common Stock			23,499
		CBS Corp. Class B		Common Stock			45,501
		Celgene Corp.		Common Stock			19,680
		CF Inds Holdings		Common Stock			887
		Charys Holding Co.		Common Stock			2
		Cheniere Energy Inc		Common Stock			568
		Chesapeak Energy		Common Stock			3,900
		Chevron Corp.		Common Stock			7,155
		Chicago Bridge & Iron Co.		Common Stock			990
		Circuit City Stores		Common Stock			108
		Citigroup Inc.		Common Stock			10,184
		Citigroup Inc		Preferred Stock			5,912
		Clinical Data Inc.		Common Stock			2,049
		Coca Cola Co.		Common Stock			3,553
		Compass Minerals International		Common Stock			14,145
		Conocophillips		Common Stock			3,626
		Coronado Res LTD		Common Stock			491
		Corporate Exec Board		Common Stock			2,122
		Costco Whsl Corp. New		Common Stock			5,439
		CrossTex Energy Inc		Common Stock			747
		Crowflight Minerals Inc.		Common Stock			135
		CTS Corp.		Common Stock			555
		Deere & Co		Common Stock			757
		Del Global Technologies Corp.		Common Stock			98
		Deliste Incorporated		Common Stock			126
		Dodge & Cox Funds		Balanced Fund			121,700
		Dodge & Cox Funds		Income Fund			59,817
		Dodge & Cox Funds		Stock Fund			50,675

WESCO Distribution, Inc.
Retirement Savings Plan

EIN 25-1723345, Plan Number 001 December 29, 2008		Schedule H, line 4i

(a)		(b)		(c)		(d)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,		Current
		Similar Party		Par, or Maturity Value		Value
		Dorchester Minerals LP		Common Stock			1,552
		Dynamic Materials Corp		Common Stock			1,619
		Eaton Corp.		Common Stock			50,995
		EI Dupont		Common Stock			490
		Enbridge Energy Partners		Common Stock			2,449
		Energy Transfer Equity LP		Common Stock			3,358
		EON AG.SP ADR		Common Stock			11,847
		Excelsior Funds		Value & Restructuring Fund			7,382
		Exide Technologies		Common Stock			23,000
		Exxon Mobil Corp.		Common Stock			27,697
		Fastenal Company		Common Stock			6,468
		Federal Mogul Corp.		Common Stock			1
		Federal Mogul		Series D Convertible Rights and Warrants			71
		First Marblehead Corp		Common Stock			162
		Fluor Corp		Common Stock			8,836
		Federal National Meeting Association		Series S Preferred Stock			270
		Fortescue Metal Group LTD		Common Stock			188
		Foster Wheeler LTD		Common Stock			7,119
		Freeport McMoran Copper & Gold Inc.		Common Stock			14,810
		Frontline LTD		Common Stock			2,879
		Fuel-Tech		Common Stock			5,085
		Gamco International Growth AAA		Foreign Large Growth Fund			5,152
		General Cable Corp		Common Stock			644
		General Electric		Common Stock			65,224
		Goldcorp Inc.		Common Stock			1,565
		Goldman Sachs Group		Common Stock			7,656
		Google Inc.		Common Stock			595
		Halliburton Co		Common Stock			10,750
		Harbor Funds		International Fund			31,236
		Harbor Funds		Bond Fund — Institutional Class			10,144
		Hawaiian Electric Ind. Inc.		Common Stock			8,060
		Headwaters Inc.		Common Stock			1,334
		Heartland Funds		Select Value Fund			15,162
		Hewlett Packard		Common Stock			7,116
		I Shares		Silver Trust			84,275
		I Shares		Lehman US Treas Inf Pro Sec			59,738
		I Shares		Lehman 1-3 Year Bond Fund			59,403
		I Shares		TR JBOXX High Yield Corporate Bond Fund			50,369
		I Shares		Nasdaq Biotechnology Index Fund			49,939
		I Shares		S&P Trust Fund			37,642
		I Shares		MSCI Switzerland Ind Fund			26,462
		I Shares		MSCI Emerging Markets Index Fund			25,800
		I Shares		S&P Global Utilities			11,911
		I Shares		S&P Global Telecom Fund			9,842
		I Shares		DJ Select Dividend Index Fund			7,081
		I Shares		S&P Global 100			3,850

EIN 25-1723345, Plan Number 001 December 29, 2008		Schedule H, line 4i

(a)		(b)		(c)		(d)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,		Current
		Similar Party		Par, or Maturity Value		Value
		I Shares		S&P Gloal Finl Sector			3,639
		I Shares		DJ U.S. Consumer Cycl SEC Fund			2,016
		I Shares		MSCI Canadian Index Fund			1,669
		I Shares		MSCI Brazil			1,472
		I Shares		MSCI Taiwan Index Fund			1,438
		I Shares		TR Dow Jones US Aerospace & Defense Equity Fund			5,816
		Icon Funds		Icon Healthcare Fund			35,615
		Icon Funds		International Equity Fund			24,378
		Idaho General Mines Inc.		Common Stock			469
		IGO Inc.		Common Stock			8,256
		Integral Technologies Inc.		Common Stock			1,260
		Intel Corp.		Common Stock			16,956
		International Pkg & Logistics		Common Stock			3
		Interplay Entertainment		Common Stock			80
		Intl Speedway		Common Stock			4,867
		Invio Biomedical Corp.		Common Stock			825
		Ivanhoe Energy, Inc.		Common Stock			37
		J.P. Morgan Chase & Co.		Common Stock			13,401
		Janus Funds		Overseas Fund			26,511
		Janus Funds		Mid Cap Value Fund			17,536
		Janus Funds		Enterprise Fund			13,004
		Janus Funds		Special Equity Fund			8,933
		Janus Funds		Orion Fund			6,313
		John Bean Technologies Corp		Common Stock			161
		Johnson & Johnson		Common Stock			4,826
		KBR Inc.		Common Stock			4,452
		Keryx Biopharmaceuticals		Common Stock			44
		Key Bankshares		Common Stock			3,438
		Kinder Morgan Energy Partners LP		Common Stock			11,295
		Kinetics Paradigm Fund		Common Stock			9,183
		Koko Petroleum Inc.		Common Stock			60
		Kraft Foods		Common Stock			902
		Lehman Brothers Holdings Inc		Preferred Stock			1
		Loomis Sayles		Global Bond Fund			167,299
		Lowes Companies		Common Stock			6,375
		Managers Intermediate Duration Govt		Fixed Fund			42,392
		Manhattan Pharmaceuticals		Common Stock			42
		Mannkind Corp		Common Stock			1,292
		Marathon Oil Corp		Common Stock			12,960
		Marisco		21st Century Mutual Fund			5,049
		Marsico		Large Growth Fund			17,248
		Market Vectors ETF TR		Agribusiness Fund			3,950
		Market Vectors ETF TR		Global Alternative Energy Fund			3,299
		Masco Corp		Common Stock			31,530
		Mastercard Inc.		Common Stock			11,147

WESCO Distribution, Inc.
Retirement Savings Plan

EIN 25-1723345, Plan Number 001 December 29, 2008		Schedule H, line 4i

(a)		(b)		(c)		(d)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,		Current
		Similar Party		Par, or Maturity Value		Value
		Matrix Advisors		Value Fund			27,077
		Maxwell Technologies Inc		Common Stock			966
		MBIA Inc.		Common Stock			12,120
		McDermott Intl		Common Stock			2,040
		MDRNA Inc.		Common Stock			76
		Mechel-ADR		Common Stock			392
		MEMCO Electronic Materials		Common Stock			1,308
		Merck & Co.		Common Stock			3,396
		Microsoft Corp		Common Stock			18,960
		Monsanto Company		Common Stock			6,847
		Mosaic Co.		Common Stock			1,660
		Nacel Energy Corp.		Common Stock			2,400
		Neomedia Technologies		Common Stock			14
		Neuberger Berman		Real Estate Fund			10,326
		Newcastle Investment Corp.		Common Stock			145
		Nokia Corp.		Common Stock			5,321
		Nucor Corp		Common Stock			8,892
		Nidia Corp		Common Stock			1,163
		Oakmark Funds		Global Fund			34,744
		Oakmark Funds		Equity and Income Fund (I)			30,885
		Oakmark Funds		Equity Fund			8,707
		Oakmark Funds		International Fund (Class I)			6,979
		Oneok Partners LP		Common Stock			6,626
		Oracle Systems		Common Stock			5,166
		Palomar Medical Tech		Common Stock			21,420
		Parnassus Income Trust		Equity Income Fund			228,821
		Paychex Inc.		Common Stock			3,708
		Peabody Energy Corp		Common Stock			1,867
		Petro Canada		Common Stock			2,544
		Petrohawk Energy Corp.		Common Stock			3,941
		Petroleo Brasileiro SA Petrobas Sponsored ADR		Common Stock			1,120
		Philip Morris International Inc.		Common Stock			2,158
		PIMCO Funds		Total Return Fund			98,344
		PNC Financial Services Group		Common Stock			1,223
		PNM Resources Inc.		Common Stock			44,910
		Powershares		DB Agricultural Fund			18,066
		Powershares		DB Multi Sector Commodity TR Powershares DB Oil Fund			49,817
		Powershares		Global Water Portfolio Fund			8,274
		Proshares TR		Ultra Financial Fund			47,250
		Purchase Pro.com		Common Stock			1
		Pyramid Oil Co.		Common Stock			91
		Qualcomm Inc.		Common Stock			8,525
		Rayonier Inc		Common Stock			585
		Reliant Energy, Inc.		Common Stock			7,875
		Research In Motion LTD		Common Stock			2,911

WESCO Distribution, Inc.
Retirement Savings Plan

EIN 25-1723345, Plan Number 001 December 29, 2008		Schedule H, line 4i

(a)		(b)		(c)		(d)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,		Current
		Similar Party		Par, or Maturity Value		Value
		Reserve Primary Fund		Primary Fund CLA			122,430
		Royce		Total Return Fund			4,586
		RS Partners		Growth Fund			2,495
		Riversource Trust		Diverisfied Equity Income Fund			49,712
		Riversource Trust		Strategic Allocation Class R4 Fund			22,087
		Sandridge Energy Inc.		Common Stock			5,540
		Sasol LTD ADR		Common Stock			5,087
		Schering-Plough		Common Stock			3,310
		Sequenom Inc.		Common Stock			968
		Shaw Group Inc.		Common Stock			1,927
		Silver Eagle Mines Inc.		Common Stock			418
		Silver Grail Res LTD		Common Stock			463
		Silver Quest Res LTD		Common Stock			86
		Silver Star Energy		Common Stock			1
		Sims Group LTD		Common Stock			5,720
		SIRF Technology Holdings Inc.		Common Stock			262
		Sirius Satellite Radio Inc.		Common Stock			77
		SIT Funds		US Government Securities Fund			147,479
		Sociedad Quimica Y Minera de Chile		Common Stock			2,458
		Sohu.com Inc.		Common Stock			1,349
		Sound Shore Fund		Common Stock			4,373
		SPDR		Gold Trust Fund			83,587
		SPDR		S&P China ETF Fund			23,903
		Spectra Energy Corp		Common Stock			3,788
		SSGA		International Stock Selection Fund			33,354
		Statiol ASA Group		Common Stock			21,681
		Strategic Resource Acquisition Corp		Common Stock			40
		Sun Microsystems		Common Stock			23,165
		Sysco Corp.		Common Stock			5,292
		T. Rowe Price Funds		New Asia Fund			172,026
		T. Rowe Price Funds		Balanced Fund			107,728
		T. Rowe Price Funds		Capital Appreciation Fund			86,368
		T. Rowe Price Funds		New Era Fund			70,257
		T. Rowe Price Funds		Growth Stock Fund			30,764
		T. Rowe Price Funds		Spectrum International Fund			10,691
		T. Rowe Price Funds		Dividend Growth Fund			3,506
		TCW Funds, Inc.		Focused Equities Fund			10,338
		TEJON Ranch Co		Common Stock			2,357
		Tellabs		Common Stock			1,230
		The India Fund Inc.		Equity Fund			6,262
		The Muhlenkamp Fund		Equity Fund			5,265
		Third Avenue		Real Estate Value Fund			70,736
		Third Avenue		International Value Fund			38,579
		Third Avenue		Value Fund			10,871
		Third Avenue		Small Cap Value Fund			10,856
		Thompson Plumb and Associates		Growth Fund			2,676

EIN 25-1723345, Plan Number 001 December 29, 2008		Schedule H, line 4i

(a)		(b)		(c)		(d)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,		Current
		Similar Party		Par, or Maturity Value		Value
		3M Company		Common Stock			29,125
		Time Warner Cable		Common Stock			52,520
		Time Warner Inc.		Common Stock			25,090
		Transocean Inc.		Common Stock			12,244
		Trinity Industries Inc.		Common Stock			2,936
		Tumi Res LTD		Common Stock			668
		TVIA Inc.		Common Stock			40
		UIL Holdings Corp		Common Stock			29,440
		Ultra Petroleum Corp		Common Stock			3,330
		Unigene Labs Inc.		Common Stock			3,200
		US Bancorp		Common Stock			28,452
		Valeant Pharmaceuticals Intl.		Common Stock			2,214
		Vanguard Funds		Target Ret 2015			118,772
		Vanguard Funds		Specialized Portfolios — Dividend Appreciation			87,891
		Vanguard Funds		Total Stock Market Vipers			47,031
		Vanguard Funds		Windsor II Fund			34,363
		Vanguard Funds		Wellesley Income Fund			20,668
		Vanguard Funds		Extended Market Vipers Ind Fund			20,511
		Vanguard Funds		International Value Fund			15,290
		Vanguard Funds		International Growth Fund			14,864
		Vanguard Funds		Growth Vipers Common Stock			1,902
		Vanguard Funds		Mid Cap Growth Index Viper Shares Fund			1,623
		Vecima Networks Inc		Common Stock			5
		Veolia Environment ADR		Common Stock			4,452
		Viacom Inc.		Common Stock Class B			100,193
		Virgin Media Inc.		Common Stock			13,350
		Visa Inc.		Common Stock			15,912
		Walgreen Co		Common Stock			4,730
		Wasatch Heritage		Growth Fund			6,767
		Washington Mutual Savings Bank		Common Stock			2,415
		Wells Fargo & Co		Common Stock			11,132
		White Mountains Insurance Group		Common Stock			2,728
		Whole Food Market Inc		Common Stock			994
		Windstream Corp		Common Stock			26,670
		WW Grainger		Common Stock			1,495
		Stock Funds and Self-Directed
		Accounts Total					11,463,975
		Institutional Enhanced Index Fixed
		Income Fund		Common Collective Trust			105,930,357
		Wrapper Contract		Wrapper Contract			—
		Stable Value Fund Total					105,930,357
		CASH		Cash and Cash Equivalents			14,828
		EVERGREEN INST MONEY MARKET FUND CL I (FD #495)		Cash and Cash Equivalents			484,175

WESCO Distribution, Inc.
Retirement Savings Plan

EIN 25-1723345, Plan Number 001 December 29, 2008		Schedule H, line 4i

(a)		(b)		(c)		(d)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,		Current
		Similar Party		Par, or Maturity Value		Value
		3M CO COM		Common Stock			52,934
		ABBOTT LABS COM		Common Stock			62,552
		ABERCROMBIE & FITCH CO CL A		Common Stock			3,695
		ABM INDS INC COM		Common Stock			3,416
		ACCENTURE LTD COM		Common Stock			42,074
		ACCO BRANDS CORP COM		Common Stock			1,599
		ACE LIMITED COM		Common Stock			41,136
		ACTIVISION BLIZZARD INC COM		Common Stock			3,420
		ACUITY BRANDS INC COM		Common Stock			7,627
		ACXIOM CORP COM		Common Stock			2,037
		ADAMS RES & ENERGY INC COM		Common Stock			2,249
		ADC TELECOMMUNICATIONS INC COM		Common Stock			1,963
		ADOBE SYS INC COM		Common Stock			6,443
		ADVANCE AMERICA CASH ADVANCE COM		Common Stock			1,027
		ADVANCE AUTO PARTS COM		Common Stock			6,280
		ADVANCED MICRO DEVICES INC COM		Common Stock			5,051
		ADVANTA CORP CL B		Common Stock			728
		AECOM TECHNOLOGY CORP COM		Common Stock			8,672
		AEROPOSTALE INC COM		Common Stock			2,544
		AES CORP COM		Common Stock			7,826
		AETNA INC COM		Common Stock			33,940
		AFC ENTERPRISES INC COM		Common Stock			1,743
		AFFILIATED COMPUTER SVCS INC CL A		Common Stock			6,721
		AFLAC INC COM		Common Stock			55,663
		AGCO CORP COM		Common Stock			6,733
		AGILENT TECHNOLOGIES INC COM		Common Stock			6,910
		AGL RES INC COM		Common Stock			8,546
		AIR PRODUCTS & CHEMICALS INC COM		Common Stock			6,327
		AK STEEL HLDG CORP COM		Common Stock			2,225
		ALASKA AIR GRP INC COM		Common Stock			10,004
		ALBERTO-CULVER CO COM		Common Stock			16,463
		ALCOA INC COM		Common Stock			14,459
		ALEXANDER & BALDWIN INC COM		Common Stock			2,922
		ALLEGHANY CORP DEL COM		Common Stock			7,196
		ALLEGHENY ENERGY INC COM		Common Stock			3,630
		ALLEGHENY TECHNOLOGIES INC COM		Common Stock			3,378
		ALLERGAN INC COM		Common Stock			4,521
		ALLIANCE DATA SYSTEMS CORP COM		Common Stock			3,303
		ALLIANT ENERGY CORP COM		Common Stock			12,836
		ALLIANT TECHSYSTEMS INC COM		Common Stock			3,344
		ALLIED CAP CORP NEW COM		Common Stock			855
		ALLIED WORLD ASSURANCE HOLD COM		Common Stock			9,727
		ALLSTATE CORP COM		Common Stock			78,995
		ALON USA ENERGY INC COM		Common Stock			7,267
		ALTERA CORP COM		Common Stock			2,828

WESCO Distribution, Inc.
Retirement Savings Plan

EIN 25-1723345, Plan Number 001 December 29, 2008		Schedule H, line 4i

(a)		(b)		(c)		(d)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,		Current
		Similar Party		Par, or Maturity Value		Value
		ALTRIA GROUP INC COM		Common Stock			332,597
		AMAZON COM INC COM		Common Stock			18,278
		AMDOCS LTD COM		Common Stock			6,745
		AMERCO COM		Common Stock			5,339
		AMEREN CORP COM		Common Stock			17,307
		AMERICAN AXLE & MFG HLDGS INC COM		Common Stock			1,969
		AMERICAN CAPITAL LTD COM		Common Stock			444
		AMERICAN EAGLE OUTFITTERS INC NEW COM		Common Stock			5,548
		AMERICAN ELEC PWR CO INC COM		Common Stock			31,792
		AMERICAN EXPRESS COMPANY COM		Common Stock			33,559
		AMERICAN FINL GRP INC OHIO COM		Common Stock			10,631
		AMERICAN GREETINGS CORP CL A COM		Common Stock			2,240
		AMERICAN INTL GRP INC COM		Common Stock			30,549
		AMERICAN NATL INS CO COM		Common Stock			5,299
		AMERICAN TOWER CORP CL A		Common Stock			2,608
		AMERICAN WATER WORKS CO INC COM		Common Stock			10,910
		AMERIGROUP CORPORATION COM		Common Stock			6,208
		AMERIPRISE FINANCIAL INC COM		Common Stock			12,936
		AMERISOURCEBERGEN CORP COM		Common Stock			53,256
		AMGEN INC COM		Common Stock			29,516
		AMKOR TECHNOLOGY INC COM		Common Stock			1,321
		AMR CORP DEL COM		Common Stock			75,297
		ANADARKO PETROLEUM CORP COM		Common Stock			26,220
		ANALOG DEVICES INC COM		Common Stock			8,638
		ANIXTER INTL INC COM		Common Stock			1,490
		ANNTAYLOR HLDGS INC COM		Common Stock			2,485
		AON CORP COM		Common Stock			27,661
		APACHE CORP COM		Common Stock			12,408
		APARTMENT INVT & MGMT CO CL A		Common Stock			1,563
		APOLLO GRP INC CL A		Common Stock			6,647
		APPLE INC COM		Common Stock			25,723
		APPLIED INDL TECHNOLOGIES INC COM		Common Stock			2,101
		APPLIED MATERIALS INC COM		Common Stock			9,643
		ARCH CAPITAL GROUP LTD COM		Common Stock			14,390
		ARCH CHEMICALS INC COM		Common Stock			3,363
		ARCHER DANIELS MIDLAND CO COM		Common Stock			29,217
		ARKANSAS BEST CORP DEL COM		Common Stock			5,506
		ARMSTRONG WORLD INDUSTRIES-WI COM		Common Stock			7,313
		ARROW ELECTRS INC COM		Common Stock			8,817
		ARTHUR J. GALLAGHER & CO COM		Common Stock			7,159
		ARVINMERITOR INC COM		Common Stock			1,396
		ASBURY AUTOMOTIVE GROUP COM		Common Stock			1,391
		ASCENT MEDIA CORP COM		Common Stock			463
		ASHLAND INC COM		Common Stock			5,122
		ASPEN INSURANCE HOLDINGS LTD COM		Common Stock			6,287
		ASSOCIATED BANC CORP COM		Common Stock			8,791

WESCO Distribution, Inc.
Retirement Savings Plan

EIN 25-1723345, Plan Number 001 December 29, 2008		Schedule H, line 4i

(a)		(b)		(c)		(d)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,		Current
		Similar Party		Par, or Maturity Value		Value
		ASSURANT INC COM		Common Stock			6,170
		ASTORIA FINL CORP COM		Common Stock			5,635
		AT&T INC COM		Common Stock			254,724
		ATLAS AIR WORLDWIDE HLDGS INC COM		Common Stock			1,745
		ATMEL CORP COM		Common Stock			3,054
		ATMOS ENERGY CORP COM		Common Stock			5,760
		AUTODESK INC COM		Common Stock			2,875
		AUTOLIV INC COM		Common Stock			5,297
		AUTOMATIC DATA PROCESSING INC COM		Common Stock			36,823
		AUTONATION INC DEL COM		Common Stock			42,267
		AUTOZONE INC COM		Common Stock			15,923
		AVID TECHNOLOGY INC COM		Common Stock			1,416
		AVIS BUDGET GROUP INC COM		Common Stock			2,013
		AVNET INC COM		Common Stock			10,111
		AVON PRODS INC COM		Common Stock			15,008
		AVX CORP NEW COM		Common Stock			2,714
		AXIS CAPITAL HOLDINGS LTD COM		Common Stock			11,007
		BAKER HUGHES INC COM		Common Stock			9,946
		BALL CORP COM		Common Stock			11,108
		BANCORPSOUTH INC COM		Common Stock			4,620
		BANK OF AMERICA CORP COM		Common Stock			178,546
		BANK OF HAWAII CORP COM		Common Stock			3,792
		BANK OF NEW YORK MELLON CORP COM		Common Stock			34,124
		BARNES & NOBLE INC COM		Common Stock			5,226
		BAXTER INTL INC COM		Common Stock			32,192
		BB&T CORP COM		Common Stock			74,984
		BEAZER HOMES USA INC COM		Common Stock			1,204
		BECKMAN COULTER INC COM		Common Stock			2,382
		BECTON DICKINSON & CO COM		Common Stock			9,194
		BED BATH & BEYOND INC COM		Common Stock			14,218
		BELO CORP COM SER A		Common Stock			1,897
		BEMIS CO INC COM		Common Stock			8,225
		BENCHMARK ELECTRONICS INC COM		Common Stock			2,865
		BERKLEY W R CORP COM		Common Stock			20,763
		BEST BUY INC COM		Common Stock			33,162
		BIG LOTS INC COM		Common Stock			3,795
		BIOGEN IDEC INC COM		Common Stock			3,072
		BJ SVCS CO COM		Common Stock			1,359
		BJS WHSL CLUB INC COM		Common Stock			14,554
		BLACK & DECKER CORP COM		Common Stock			19,707
		BLACKROCK INC COM		Common Stock			10,433
		BLOCK H & R INC COM		Common Stock			10,399
		BLOCKBUSTER INC CL-A COM		Common Stock			3,158
		BLUELINX HOLDINGS INC COM		Common Stock			1,343
		BMC SOFTWARE INC COM		Common Stock			4,847
		BOEING CO COM		Common Stock			65,304

WESCO Distribution, Inc.
Retirement Savings Plan

EIN 25-1723345, Plan Number 001 December 29, 2008		Schedule H, line 4i

(a)		(b)		(c)		(d)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,		Current
		Similar Party		Par, or Maturity Value		Value
		BOK FINANCIAL CORP COM (NEW)		Common Stock			5,541
		BORDERS GRP INC COM		Common Stock			263
		BORG WARNER INC COM		Common Stock			6,754
		BOSTON PPTYS INC COM		Common Stock			6,805
		BOSTON SCIENTIFIC CORP COM		Common Stock			16,060
		BOYD GAMING CORP COM		Common Stock			1,705
		BRINKER INTL INC COM		Common Stock			2,692
		BRINKS CO/THE COM		Common Stock			2,357
		BRINKS HOME SECURITY HOLDING COM		Common Stock			1,967
		BRISTOL-MYERS SQUIBB CO COM		Common Stock			162,461
		BROADCOM CORP COM		Common Stock			7,598
		BROADRIDGE FINANCIAL SOLUTIONS COM		Common Stock			4,486
		BROWN SHOE INC NEW COM		Common Stock			2,190
		BROWN-FORMAN CORP CL B COM		Common Stock			5,293
		BRUNSWICK CORP COM		Common Stock			4,191
		BUILDERS FIRSTSOURCE INC COM		Common Stock			1,570
		BUNGE LTD COM		Common Stock			7,147
		BURGER KING HOLDINGS INC COM		Common Stock			5,407
		BURLINGTON NORTHERN SANTA FE COM		Common Stock			38,163
		C H ROBINSON WORLDWIDE INC COM		Common Stock			10,833
		C R BARD INC COM		Common Stock			4,403
		CA INC COM		Common Stock			11,075
		CABELAS INC-CL A COM		Common Stock			1,499
		CABLEVISION SYSTEMS NY GRP CL A		Common Stock			4,372
		CABOT CORP COM		Common Stock			2,543
		CADENCE DESIGN SYS INC COM		Common Stock			4,179
		CALIFORNIA WTR SERVICE GRP (DEL) COM		Common Stock			4,459
		CALPINE CORP COM		Common Stock			1,728
		CAMBREX CORP COM		Common Stock			3,235
		CAMERON INTERNATIONAL CORP COM		Common Stock			4,805
		CAMPBELL SOUP CO COM		Common Stock			20,758
		CAPITAL ONE FINANCIAL CORP COM		Common Stock			31,831
		CAPITALSOURCE INC COM		Common Stock			1,052
		CARDINAL HLTH INC COM		Common Stock			67,272
		CAREER ED CORP COM		Common Stock			6,911
		CARLISLE COS INC COM		Common Stock			2,352
		CARMAX INC COM		Common Stock			3,698
		CARNIVAL CORP COM		Common Stock			15,183
		CARPENTER TECHNOLOGY CORP COM		Common Stock			3,051
		CARTER HOLDINGS COM		Common Stock			6,531
		CASEYS GEN STORES INC COM		Common Stock			8,315
		CATERPILLAR INC COM		Common Stock			22,864
		CATHAY BANCORP INC COM		Common Stock			4,864
		CATO CORP NEW CL A		Common Stock			3,298
		CB RICHARD ELLIS GROUP INC-A COM		Common Stock			2,619
		CBS CORP COM		Common Stock			31,306