As filed with the Securities and Exchange Commission on April 20, 2006

Registration No. 333-           

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form S-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

WESCO INTERNATIONAL, INC.

(exact name of registrant as specified in its charter)

WESCO DISTRIBUTION, INC.

(exact name of registrant as specified in its charter)

225 West Station Square Drive

Suite 700

Pittsburgh, Pennsylvania 15219

(412) 454-2200

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Stephen A. Van Oss

Senior Vice President and

Chief Financial and Administrative Officer

WESCO International, Inc.

225 West Station Square Drive

Suite 700

Pittsburgh, Pennsylvania 15219

(412) 454-2200

(Name, address, including zip code, and telephone number, including area code, of agent for service)

With a Copy to:

Michael C. McLean

Kirkpatrick & Lockhart Nicholson Graham LLP

Henry W. Oliver Building

535 Smithfield Street

Pittsburgh, Pennsylvania 15222

(412) 355-6500

     Approximate date of commencement of proposed sale to the public: As soon as practicable after this registration statement becomes effective.

     If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act, check the following box:    þ

     If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o                          

     If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o                          

     If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o                          

CALCULATION OF REGISTRATION FEE

     The Registrants hereby amend this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrants shall file a further amendment that specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the Registration Statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.

SUBJECT TO COMPLETION, DATED APRIL 20, 2006

PRELIMINARY PROSPECTUS

WESCO International, Inc.

2.625% Senior Convertible Debentures due 2025

On September 27, 2005, WESCO International, Inc. issued $150.0 million aggregate principal amount of 2.625% Convertible Senior Debentures due 2025 in a private offering. Payment of all principal and interest (including contingent interest or additional interest, if any) payable on the Debentures is unconditionally guaranteed by WESCO International’s subsidiary, WESCO Distribution, Inc. The Debentures are senior unsecured obligations of WESCO International, and the guarantee is an unsecured senior subordinated obligation of WESCO Distribution. This prospectus covers resales from time to time by selling securityholders of any or all of their Debentures, including the related guarantee, and shares of common stock of WESCO International into which the Debentures are convertible. We will not receive any proceeds from the resale by the selling securityholders of the Debentures or the shares of common stock hereunder.

The Debentures are convertible, at your option, into cash and shares of our common stock initially based on a conversion rate of 23.8872 shares (equivalent to an initial conversion price of approximately $41.86 per share), subject to adjustment as described in this prospectus, at any time on or prior to the close of business on the trading day immediately preceding the maturity date, only under the circumstances described in this prospectus.

Upon conversion, we will pay cash and shares of our common stock, if any, based on a daily conversion value (as described herein) calculated on a proportionate basis for each day of the 20 trading-day cash settlement averaging period. See “Description of the Debentures — Conversion Rights — Settlement Upon Conversion.” In the event of certain types of fundamental changes, we will increase the number of shares issuable upon conversion or, in lieu thereof, we may elect to adjust the conversion obligation and conversion rate so that the Debentures are convertible into shares of the acquiring or surviving company, in each case as described in this prospectus.

The Debentures bear interest at a rate of 2.625% per year. Beginning with the six-month period commencing October 15, 2010, we will also pay contingent interest during any six-month interest period in which the trading price of the Debentures, measured over a specified number of trading days preceding the applicable six-month interest period, is 120% or more of the principal amount of the Debentures. Interest on the Debentures is payable on April 15 and October 15 of each year, beginning on April 15, 2006. The Debentures will mature on October 15, 2025.

The Debentures are subject to special U.S. federal income tax rules. For a discussion of the special tax regulations governing contingent payment debt instruments, see “Certain U.S. Federal Income and Estate Tax Considerations.”

We may redeem some or all of the Debentures on or after October 15, 2010, for cash at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest (including contingent interest or additional interest, if any).

You may require us to repurchase all or a portion of your Debentures on October 15, 2010, October 15, 2015 and October 15, 2020 at a cash repurchase price equal to 100% of the principal amount plus accrued and unpaid interest (including contingent interest or additional interest, if any). In addition, you may require us to repurchase all or a portion of your Debentures upon a fundamental change at a cash repurchase price equal to 100% of the principal amount plus accrued and unpaid interest (including contingent interest or additional interest, if any).

Our common stock is listed on The New York Stock Exchange under the ticker symbol “WCC.” The last reported sale price of our common stock on April 19, 2006 was $74.97 per share.

We do not intend to apply for listing of the Debentures on any securities exchange or for inclusion of the Debentures in any automated quotation system. The Debentures originally issued in the private offering are eligible for trading on The PORTAL^sm Market of the National Association of Securities Dealers, Inc. However, the Debentures sold pursuant to this prospectus will no longer be eligible for trading in The PORTAL^sm Market of the National Association of Securities Dealers, Inc.

The Debentures, including the related guarantee, and the common stock may be sold from time to time by the selling securityholders named in this prospectus through public or private transactions, at prevailing market prices or at privately negotiated prices, either directly or through agents or broker-dealers acting as principal or agent. The selling securityholders may engage underwriters, brokers, dealers or agents, who may receive commissions or discounts from the selling securityholders. We will pay substantially all of the expenses incident to the registration of the Debentures, including the related guarantee, and shares of our common stock, except for the selling commissions, if any. See “Plan of Distribution.”

Investing in the Debentures or our common stock involves risks. See “Risk Factors” beginning on page 3.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED THAT THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

THE DATE OF THIS PROSPECTUS IS                   , 2006.

TABLE OF CONTENTS

      WESCO International, Inc. and WESCO Distribution, Inc., a wholly owned subsidiary of WESCO International, each are a Delaware corporations incorporated in 1993. The principal executive offices of WESCO International and WESCO Distribution are each located at 225 West Station Square Drive, Suite 700, Pittsburgh, Pennsylvania 15219, and the telephone number at that address is (412) 454-2200. Our website is located at www.wesco.com. The information in our website is not part of this prospectus.

      We currently have trademarks and service marks registered with the U.S. Patent and Trademark Office. The registered trademarks and service marks include: “WESCO^®”, our corporate logo, the running man logo, the running man in box logo and “The Extra Effort People^®”. In 2005, two trademarks, “CB Only the Best is Good Enough” and “LADD,” were added as a result of the acquisition of Carlton-Bates Company. Certain of these and other trademark and service mark registration applications have been filed in various foreign jurisdictions, including Canada, Mexico, the United Kingdom, Singapore and the European Community.

      Neither WESCO Distribution, WESCO International nor any of their respective representatives are making any representation to you regarding the legality of an investment by you under applicable laws. You should consult with your own advisors as to legal, tax, business, financial and related aspects of an investment in the Debentures or our common stock.

      In making an investment decision, you must rely on your own examination of our business and the terms of the exchange offer, including the merits and risks involved. No person has been authorized to give any information or any representation concerning us, the Debentures, including the related guarantee, or our common stock (other than as contained in this prospectus), and, if given or made, that other information or representation should not be relied upon as having been authorized by us. Neither WESCO International, WESCO Distribution nor any of their respective representatives are making an offer to sell these securities in any jurisdiction where the offer is not permitted. You should not assume that the information contained in this prospectus is accurate as of any date other than the date on the front cover of this prospectus.

FORWARD-LOOKING INFORMATION

      This prospectus contains various “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These statements involve certain unknown risks and uncertainties, including, among others, those contained in our Annual Report on Form 10-K for our fiscal year ended December 31, 2005, which is incorporated by reference in this prospectus, under Item 1, “Business,” Item 1A, “Risk Factors,” and Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” When used in this prospectus, the words “anticipates,” “plans,” “believes,” “estimates,” “intends,” “expects,” “projects,” “will” and similar expressions may identify forward-looking statements, although not all forward-looking statements contain such words. Such statements, including, but not limited to, our statements regarding business strategy, growth strategy, productivity and profitability enhancement, competition, new product and service introductions and liquidity and capital resources are based on management’s beliefs, as well as on assumptions made by and information currently available to, management, and involve various risks and uncertainties, some of which are beyond our control. Our actual results could differ materially from those expressed in any forward-looking statement made by or on our behalf. In light of these risks and uncertainties, there can be no assurance that the forward-looking information will in fact prove to be accurate. We have undertaken no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

WESCO INTERNATIONAL, INC.

      With sales of $4.4 billion in 2005, we are a leading North American provider of electrical construction products and electrical and industrial maintenance, repair and operating supplies, commonly referred to as “MRO.” We believe we are the largest distributor in terms of sales in the estimated $74 billion*

U.S. electrical wholesale distribution industry based upon published industry sources and our assessment of peer company 2005 sales. We believe we are also the largest provider of integrated supply services for MRO goods and services in the United States.

      Our distribution capability combined with integrated supply solutions and outsourcing services are designed to fulfill a customer’s MRO procurement needs. We have more than 370 full service branches and eight distribution centers located in the United States, Canada, Mexico, Puerto Rico, Guam, the United Kingdom, Nigeria, United Arab Emirates and Singapore. We serve approximately 100,000 customers worldwide, offering more than 1,000,000 products from more than 24,000 suppliers utilizing a highly automated, proprietary electronic procurement and inventory replenishment system. Our diverse customer base includes a wide variety of industrial companies; contractors for industrial, commercial and residential projects; utility companies; and commercial, institutional and governmental customers. Our top ten customers accounted for approximately 14% of our sales in 2005. Our leading market positions, experienced workforce, extensive geographic reach, broad product and service offerings and acquisition program have enabled us to grow our market position.

      * Source: Electrical wholesale estimated industry sales per Electrical Wholesaling (November, 2005) based upon revised U.S. Census Bureau Survey segregating electrical wholesale vs. electrical retail sales. Electrical Wholesaling’s 2004 estimated industry sales of $83 billion had aggregated $67 billion wholesale and $16 billion retail sales.

SUMMARY CONSOLIDATED FINANCIAL DATA

      The table below sets forth certain of our historical consolidated financial data as of and for each of the periods indicated. The financial information for the years ended December 31, 2003, 2004 and 2005, and as of December 31, 2004 and 2005, is derived from our audited consolidated financial statements, which are incorporated by reference in this prospectus. The financial information as of December 31, 2003 is derived from our audited consolidated financial statements, which do not appear and are not incorporated by reference in this prospectus. The data below should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our audited consolidated financial statements and the notes thereto, which are incorporated by reference in this prospectus.

RECENT DEVELOPMENTS

Earnings for Three Months Ended March 31, 2006

      On April 20, 2006, we announced our financial results for the fiscal quarter ended March 31, 2006. Consolidated net sales for the first quarter 2006 were $1,265.5 million compared with $990.9 million in 2005, an increase of 27.7%. Sales from the two acquisitions completed in the third quarter of 2005 were approximately $107 million. Gross margin for the quarter improved to 20.0% versus 18.7% reported last year. Operating income for the quarter totaled $76.9 million, an increase of 99% over the $38.6 million earned in the first quarter of 2005. Depreciation and amortization included in operating income was $6.3 million in 2006 compared to $3.9 million in 2005. Net income in the first quarter was $44.5 million in 2006 versus $11.3 million in the comparable 2005 quarter. First quarter 2006 earnings included a charge net of income taxes of $2.7 million for the write down of receivables from a major customer, which filed for bankruptcy protection during the quarter. First quarter 2005 earnings included an after tax charge of $6.5 million associated with the repurchase of $123.8 million of WESCO Distribution’s 9¹/8 % Senior Subordinated Notes due 2008. Diluted earnings per share in the current quarter were $0.86 per share compared with $0.23 per share in 2005.

RATIOS OF EARNINGS TO FIXED CHARGES

      Our consolidated ratios of earnings to fixed charges for the years ended December 31, 2001, 2002, 2003, 2004 and 2005 are as follows:

RISK FACTORS

      Before investing in Debentures or our common stock, you should carefully consider the following risk factors in conjunction with the risk factors set forth in Item 1A of our Annual Report on Form 10-K for our fiscal year ended December 31, 2005 and the other information contained or incorporated by reference in this prospectus, including our historical financial statements and the related notes thereto. These factors, among others, could cause actual results to differ materially from those currently anticipated and presented from time to time in the future by our management. See “Special Note on Forward Looking Statements.”

Risks Relating to the Debentures and Our Common Stock

      As of December 31, 2005, we had approximately $403.6 million of outstanding consolidated debt. This level of our debt and the related debt service requirements could have significant consequences on our future operations, including:

      Any of the above-listed factors could have an adverse effect on our business, financial condition and results of operations and our ability to meet our payment obligations under the Debentures and our other debt.

      As a holding company, our ability to meet our payment and other obligations under our debt instruments depends on our and our subsidiaries’ ability to generate significant cash flow in the future. This, to some extent, is subject to general economic, financial, competitive, legislative and regulatory factors as well as other factors that are beyond our control. We cannot assure you that our business will generate cash flow from operations, or that future borrowings will be available to us under our credit facilities or otherwise, in an amount sufficient to enable us to meet our payment obligations under the Debentures, WESCO Distribution’s senior subordinated indebtedness and our other debt and to fund other liquidity needs. If we or our subsidiaries are not able to generate sufficient cash flow to service our debt obligations, we may need to refinance or restructure our debt, including the Debentures, sell assets, reduce or delay capital investments, or seek to raise additional capital. If we or our subsidiaries are unable to implement one or more of these alternatives, we may not be able to meet our payment obligations under the Debentures and our other debt.

      Although our credit facilities and the indenture regarding WESCO Distribution’s senior subordinated indebtedness contains restrictions on the incurrence of additional indebtedness, these restrictions are subject to a number of qualifications and exceptions, and the indebtedness incurred in compliance with these restrictions could be substantial. Also, these restrictions do not prevent us from incurring obligations that do not constitute “indebtedness” as defined in the relevant agreement. If new debt is added to our current debt levels, the related risks that we now face could intensify. At December 31, 2005, WESCO Distribution had approximately $228 million in available borrowing capacity under its credit facilities. All borrowings under its credit facilities are senior to WESCO Distribution’s guarantee of the Debentures.

      Our credit facilities and the indenture relating to WESCO Distribution’s senior subordinated indebtedness contains, and any of our other future debt agreements may contain, covenant restrictions that limit our ability to operate our business, including restrictions on our ability to:

      Our credit facilities also require us to maintain specific earnings to fixed expenses and debt to earnings ratios and to meet minimum net worth requirements. In addition, our credit facilities contain additional affirmative and negative covenants that are more restrictive than those contained in the indenture governing the Debentures. Our ability to comply with these covenants is dependent on our future performance, which will be subject to many factors, some of which are beyond our control, including prevailing economic conditions.

      As a result of these covenants, our ability to respond to changes in business and economic conditions and to obtain additional financing, if needed, may be significantly restricted, and we may be prevented from engaging in transactions that might otherwise be beneficial to us. In addition, our failure to comply with these covenants could result in a default under the Debentures, WESCO Distribution’s senior subordinated indebtedness and our other debt, which could permit the holders to accelerate such debt. If any of our debt is accelerated, we may not have sufficient funds available to repay such debt.

      The Debentures will be our general, unsecured obligations and will rank equally in right of payment with all of our existing and future unsubordinated, unsecured indebtedness. As a result, the Debentures are effectively subordinated to existing and future secured indebtedness we may have to the extent of the value of the assets securing such indebtedness and structurally subordinated to any existing and future liabilities and other indebtedness of our subsidiaries, other than the senior subordinated indebtedness of WESCO Distribution, including the Notes, if issued, and any subordinated indebtedness of WESCO Distribution. These liabilities may include indebtedness, trade payables, guarantees, lease obligations and letter of credit obligations. The Debentures do not restrict us or our subsidiaries from incurring indebtedness, including

senior secured indebtedness in the future, nor do they limit the amount of indebtedness we can issue that is equal in right of payment.

      Our obligations and the obligations of WESCO Distribution under our revolving credit facility are secured by a first priority pledge of and security interest in substantially all of our assets and the assets of our subsidiaries, except for real property. If either we or WESCO Distribution become insolvent or are liquidated, or if payment under our revolving credit facility or any other secured indebtedness is accelerated, the lenders under the revolving credit facility or any such other future secured indebtedness will be entitled to exercise the remedies available to a secured lender under applicable law (in addition to any remedies that may be available under the instruments pertaining to the credit facility or such other secured indebtedness). Neither the Debentures nor the guarantee are secured. Accordingly, holders of such secured indebtedness will have a prior claim with respect to the assets securing such indebtedness. See “Description of the Notes and Other Indebtedness.”

      Substantially all of our consolidated assets are held by our subsidiaries. Accordingly, our ability to service our debt, including the Debentures, depends on the results of operations of our subsidiaries and upon the ability of such subsidiaries to provide us with cash, whether in the form of management fees, dividends, loans or otherwise, and to pay amounts due on our obligations, including the Debentures. Our subsidiaries are separate and distinct legal entities and, apart from the guarantee of WESCO Distribution, have no obligation, contingent or otherwise, to make payments on the Debentures or to make any funds available for that purpose. In addition, dividends, loans or other distributions to us from such subsidiaries may be subject to contractual and other restrictions and are subject to other business considerations.

      The guarantee of the Debentures is contractually subordinated in right of payment to the existing and future senior indebtedness of WESCO Distribution. At December 31, 2005, WESCO Distribution and its subsidiaries had approximately $103 million of senior debt, and had the ability to borrow up to an additional $228 million under our credit facilities, all of which, if borrowed or drawn upon, would be senior debt. Any incurrence of additional indebtedness by us or WESCO Distribution may materially adversely impact our ability to service our debt, including the Debentures. Due to the subordination provisions of the senior subordinated indebtedness of WESCO Distribution, including the Debentures, in the event of our insolvency, funds of WESCO Distribution that would otherwise be used to pay the holders of the Debentures and other senior subordinated indebtedness of WESCO Distribution will be used to pay the holders of senior indebtedness to the extent necessary to pay the senior indebtedness in full. As a result of these payments, general creditors may recover less, ratably, than the holders of senior indebtedness of WESCO Distribution and the general creditors may recover more, ratably, than the holders of the Debentures or other subordinated indebtedness of WESCO Distribution. In addition, the holders of senior indebtedness of WESCO Distribution may, under certain circumstances, restrict or prohibit WESCO Distribution from making payments on the Debentures.

      Although laws differ among various jurisdictions, a court could, under fraudulent conveyance laws, further subordinate or avoid the guarantees if it found that the guarantees were incurred with actual intent to

hinder, delay or defraud creditors, or WESCO Distribution did not receive fair consideration or reasonably equivalent value for the guarantee and that WESCO Distribution was any of the following:

If a court voided the guarantee of WESCO Distribution as the result of a fraudulent conveyance, or held it unenforceable for any other reason, holders of the Debentures would cease to have a claim against WESCO Distribution based on the guarantee and would solely be creditors of WESCO International.

      Only WESCO Distribution guarantees the Debentures. In the event of a bankruptcy, liquidation or reorganization of any of the non-guarantor subsidiaries, holders of their indebtedness and their trade creditors will generally be entitled to payment of their claims from the assets of those non-guarantor subsidiaries before any assets of the non-guarantor subsidiaries are made available for distribution to WESCO International or WESCO Distribution. As of December 31, 2005, the Debentures were effectively junior to $212 million of indebtedness and other liabilities (including trade payables) of these non-guarantor subsidiaries. The nonguarantor subsidiaries generated $756 million of our net sales for the year ended December 31, 2005 and held approximately $1 billion of our consolidated assets at December 31, 2005.

      The indenture under which the Debentures were issued does not contain restrictive covenants that would protect you from several kinds of transactions that may adversely affect you. In particular, the indenture does not contain covenants that will limit our ability to pay dividends or make distributions on or redeem our capital stock or limit our ability to incur additional indebtedness and, therefore, may not protect you in the event of a highly leveraged transaction or other similar transaction. The requirement that we offer to repurchase the Debentures upon a change of control is limited to the transactions specified in the definition of a “fundamental change” under “Description of the Debentures — Repurchase at the Option of the Holder — Fundamental Change Put.” Similarly, the circumstances under which we are required to adjust the conversion rate upon the occurrence of a “non-stock change of control” are limited to circumstances where a Debenture is converted in connection with such a transaction as set forth under “Description of the Debentures — Conversion Rights — Adjustment to Conversion Rate Upon a Non-Stock Change of Control.” Accordingly, subject to restrictions contained in our other debt agreements, we could enter into certain transactions, such as acquisitions, refinancings or recapitalizations, that could affect our capital structure and the value of the Debentures and common stock but would not constitute a fundamental change under the Debentures.

      Holders of the Debentures have the right to require us to repurchase the Debentures on specified dates or upon the occurrence of a fundamental change prior to maturity as described under “Description of the Debentures — Repurchase at the Option of the Holder — Optional Put” and “— Fundamental Change Put.” The occurrence of a change of control would also constitute an event of default under our credit facilities, requiring repayment of amounts outstanding thereunder and the occurrence of a change of control would also enable holders of WESCO Distribution’s senior subordinated notes to require WESCO Distribution to repurchase such notes at a price equal to 101% of the principal amount thereof, plus accrued and unpaid interest and additional interest, if any. Any of our future debt agreements may contain similar provisions. We

may not have sufficient funds to make the required repayments and repurchases at such time or the ability to arrange necessary financing on acceptable terms. In addition, our ability to repurchase the Debentures in cash may be limited by law or the terms of other agreements relating to our debt outstanding at the time, including our credit facilities, which will limit our ability to purchase the Debentures for cash in certain circumstances. If we fail to repurchase the Debentures in cash as required by the indenture, it would constitute an event of default under the indenture governing the Debentures, which, in turn, would constitute an event of default under our credit facilities and the indenture related to WESCO Distribution’s senior subordinated notes, if the Notes.

      Upon the occurrence of a fundamental change, you have the right to require us to repurchase Debentures. However, the fundamental change provisions will not afford protection to holders of the Debentures in the event of certain transactions. For example, transactions such as leveraged recapitalizations, refinancings, restructurings or acquisitions initiated by us would not constitute a fundamental change requiring us to repurchase the Debentures. In the event of any such transaction, the holders would not have the right to require us to repurchase the Debentures, even though each of these transactions could increase the amount of our indebtedness, or otherwise adversely affect our capital structure or any credit ratings, thereby adversely affecting the holders of the Debentures.

      Certain provisions of the Debentures could make it more difficult or more expensive for a third party to acquire us. Upon the occurrence of certain transactions constituting a fundamental change, holders of the Debentures have the right, at their option, to require us to repurchase all of their Debentures or any portion of the principal amount of such Debentures in integral multiples of $1,000. In addition, the occurrence of certain change of control transactions may result in the Debentures becoming convertible for additional shares or result in antidilution adjustments which may have the effect of making an acquisition of us less attractive. We may also be required to issue additional shares upon conversion or provide for conversion into the acquirer’s capital stock in the event of certain fundamental changes.

      If certain types of fundamental changes occur on or prior to the date when the Debentures may be redeemed, we may adjust the conversion rate of the Debentures to increase the number of shares issuable upon conversion. The number of additional shares to be issued will be determined based on the date on which the fundamental change becomes effective and the price paid per share of our common stock in the fundamental change as described under “Description of the Debentures — Conversion Rights — Adjustment to Conversion Price Upon Certain Fundamental Changes.” Although this adjustment is designed to compensate you for the lost option value of your Debentures as a result of certain types of fundamental changes, the adjustment is only an approximation of such lost value based upon assumptions made on the date of this prospectus and may not adequately compensate you for such loss. In addition, if the price paid per share of our common stock in the fundamental change is less than $31.01 or more than $80.00 (subject to adjustment), there will be no such adjustment.

      We originally sold the Debentures to a limited number of investors in a private offering in reliance on an exemption from registration under U.S. federal and applicable state securities laws, and we are now registering the Debentures, the related guarantee and the common stock issuable upon conversion of the

Debentures for resale by the selling securityholders. There is no public market for the Debentures. We do not intend to apply for listing of the Debentures on any securities exchange or for quotation of the Debentures on any automated dealer quotation system. Although the Debentures originally issued in the private offering are eligible for trading in The PORTAL^sm Market, the Debentures sold pursuant to this prospectus will no longer be eligible for trading in The PORTAL^sm Market. Despite our registering the Debentures for resale under the Securities Act, a market may not develop for the Debentures, and there can be no assurance as to the liquidity of any market that may develop for the Debentures once the securityholders are able to freely resell the Debentures. If an active, liquid market does not develop for the Debentures, the market price and liquidity of the Debentures may be adversely affected. If any of the Debentures are traded, they may trade at a discount from their initial offering price.

      The liquidity of the trading market, if any, and future trading prices of the Debentures will depend on many factors, including, among other things, the market price of our common stock, prevailing interest rates, our operating results, financial performance and prospects, the market for similar securities and the overall securities market, and may be adversely affected by unfavorable changes in these factors. Historically, the market for convertible debt securities has been subject to disruptions that have caused volatility in prices. It is possible that the market for the Debentures will be subject to disruptions which may have a negative effect on the holders of the Debentures, regardless of our operating results, financial performance or prospects.

      The Debentures are convertible into shares of our common stock only if specified conditions are met. If these conditions are not met, you will not be able to convert your Debentures, and you may not be able to receive the value of the common stock into which the Debentures would otherwise be convertible.

      Stock markets have experienced significant price and trading volume fluctuations, and the market prices of companies in our industry have been volatile. It is impossible to predict whether the price of our common stock will rise or fall. Trading prices of our common stock will be influenced by our operating results and prospects and by economic, financial and other factors. In addition, general market conditions, including the level of, and fluctuations in, the trading prices of stocks generally, and sales of substantial amounts of common stock by us, or the perception that such sales could occur, could affect the price of our common stock and make it more difficult for us to raise funds through future offerings of equity securities. In addition, because the Debentures are convertible into our common stock, volatility or depressed prices for our common stock could have a similar effect on the trading price of the Debentures.

      If you hold Debentures, you will not be entitled to any rights with respect to our common stock (including, without limitation, voting rights and rights to receive any dividends or other distributions on our common stock), but you will be subject to all changes affecting the common stock. You will only be entitled to rights on the common stock if and when we deliver shares of our common stock to you upon conversion of your Debentures. For example, in the event that an amendment is proposed to our charter or bylaws requiring stockholder approval and the record date for determining the stockholders of record entitled to vote on the amendment occurs prior to your conversion of Debentures, you will not be entitled to vote on the amendment, although you will nevertheless be subject to any changes in the powers, preferences or special rights of our common stock or other classes of capital stock.

      Future sales of substantial amounts of our common stock or equity-related securities in the public market, or the perception that such sales could occur, could adversely affect prevailing trading prices of our common stock and the value of the Debentures and could impair our ability to raise capital through future offerings of equity or equity-related securities. No prediction can be made as to the effect, if any, that future sales of shares of common stock or the availability of shares of common stock for future sale, will have on the trading price of our common stock or the value of the Debentures.

      As of March 31, 2006, there were 48,213,677 shares of our common stock outstanding. In addition, there were:

      The issuance or expected issuance, including upon conversion of the Debentures, of a large number of shares of our common stock or sales or expected sales of a large number of our shares of common stock, including sales by the selling securityholders, at any time after the date of this prospectus could negatively affect the trading price of our common stock.

      Upon conversion, we will pay cash and shares of our common stock, if any, based on a daily conversion value (as described herein) calculated on a proportionate basis for each day of the 20 consecutive trading days during the cash settlement averaging period. See “Description of the Debentures — Conversion Rights — Settlement Upon Conversion.” Accordingly, upon conversion of a Debenture, holders may not receive any shares of our common stock. Further, our liquidity may be reduced upon conversion of the Debentures. In addition, in the event of our bankruptcy, insolvency or certain similar proceedings during the cash settlement averaging period, there is a risk that a bankruptcy court may decide a holder’s claim to receive such cash and shares could be subordinated to the claims of our creditors as a result of such holder’s claim being treated as an equity claim in bankruptcy.

      The conversion rate of the Debentures is subject to adjustment upon certain events, including the issuance of stock dividends on our common stock, the issuance of rights or warrants, subdivisions, combinations, distributions of capital stock, indebtedness or assets, cash dividends and issuer tender or exchange offers as described under “Description of the Debentures — Conversion Rights — Conversion Rate Adjustments.” The conversion rate will not be adjusted for certain other events that may adversely affect the trading price of the Debentures or the common stock issuable upon conversion of the Debentures.

      Provisions of Delaware law and of our certificate of incorporation and bylaws could make it more difficult for a third-party to acquire control of us. For example, we are subject to Section 203 of the Delaware General Corporation Law, which would make it more difficult for another party to acquire us without the approval of our Board of Directors. Our Board of Directors is divided into three classes, with each class serving a three-year term. Additionally, our Restated Certificate of Incorporation authorizes our Board of Directors to issue preferred stock without requiring any stockholder approval, and preferred stock could be issued as a defensive measure in response to a takeover proposal. These provisions could make it more difficult for a third-party to acquire us even if an acquisition might be in the best interest of our stockholders.

      We and each holder will be bound by the indenture to treat the Debentures as “contingent payment debt instruments” subject to the contingent payment debt regulations. As a result, you will be required to include amounts in income, as original issue discount, in advance of cash you receive on the Debentures, and to accrue interest on a constant yield to maturity basis at a rate comparable to the rate at which we would borrow in a fixed-rate, noncontingent, nonconvertible borrowing (which we have determined to be 7.98%, compounded semi-annually), even though the Debentures will have a lower yield to maturity. You will recognize taxable income significantly in excess of cash received while the Debentures are outstanding. In addition, you will recognize ordinary income, if any, upon a sale, exchange, conversion or redemption of the Debentures at a gain. You are urged to consult your own tax advisors as to the U.S. federal, state and other tax consequences of acquiring, owning and disposing of the Debentures and shares of common stock. See “Certain U.S. Federal Income and Estate Tax Considerations.”

      If we pay a cash dividend on our common stock, an adjustment to the conversion rate will result, and you may be deemed to have received a taxable dividend subject to U.S. federal income tax without the receipt of any cash. If you are a non-U.S. holder (as defined in “Certain U.S. Federal Income and Estate Tax Considerations”), such deemed dividend may be subject to U.S. federal withholding tax at a 30% rate or such lower rate as may be specified by an applicable treaty. See “Certain U.S. Federal Income and Estate Tax Considerations.”

USE OF PROCEEDS

      We will not receive any proceeds from any sale by any selling securityholder of the Debentures, including the related guarantee, or the shares of common stock issuable upon conversion of the Debentures that are covered by this prospectus.

DESCRIPTION OF OTHER INDEBTEDNESS

      WESCO Distribution is party to a revolving credit facility, an accounts receivable securitization facility, a mortgage financing facility, a note payable to Bruckner Supply Company, Inc. and a note payable to Fastec Industrial Corp. The principal terms of these financing arrangements are summarized under “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Liquidity and Capital Resources” in our Annual Report on Form 10-K for our fiscal year ended December 31, 2005, which is incorporated herein by reference.

      In addition, WESCO Distribution’s senior subordinated notes are guaranteed on an unsecured senior basis by us. The guarantee of the Debentures is subordinated in right of payment to all of our existing and future senior debt. The notes are not guaranteed by any of our direct or indirect subsidiaries. The principal terms of the WESCO Distribution’s senior subordinated notes are summarized under “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Liquidity and Capital Resources” in our Annual Report on Form 10-K for our fiscal year ended December 31, 2005, which is incorporated herein by reference.

DESCRIPTION OF THE DEBENTURES

      On September 27, 2005, we issued $150.0 million aggregate principal amount of Debentures in a private offering. As of the date of this prospectus, the aggregate principal amount of Debentures outstanding is $150.0 million. The Debentures were issued under an indenture dated as of September 27, 2005, among us, as issuer, WESCO Distribution, as guarantor, and J.P. Morgan Trust Company, National Association, as trustee. The terms of the Debentures include those provided in the indenture and those provided in the registration rights agreement dated as of September 27, 2005, among us, WESCO Distribution and the initial purchasers.

      The following description is only a summary of the material provisions of the Debentures, the indenture and the registration rights agreement. We urge you to read the indenture and the registration rights agreement in their entirety because they, and not this description, define your rights as a holder of the Debentures. The indenture and the registration rights agreement have been filed as exhibits to the registration statement of which this prospectus is a part, and you may request copies of these documents as set forth under the caption “Where You Can Find More Information.”

      When we refer to “WESCO International,” “we,” “our” or “us” in this section, we refer only to WESCO International, Inc. and not its subsidiaries.

Brief Description of the Debentures

      The Debentures:

      Neither we nor any of our subsidiaries are subject to any financial covenants under the indenture. In addition, neither we nor any of our subsidiaries are restricted under the indenture from paying dividends, incurring debt or issuing or repurchasing our securities. You are not afforded protection under the indenture in the event of a highly leveraged transaction or a change in control of us, except to the extent described below under “— Conversion Rights” and “— Repurchase at Option of the Holder — Fundamental Change Put.”

      No sinking fund is provided for the Debentures, and the Debentures are not subject to defeasance.

      The Debentures initially were issued in book-entry form only in denominations of $1,000 principal amount and whole multiples thereof. Beneficial interests in the Debentures are shown on, and transfers of beneficial interests in the Debentures are effected only through, records maintained by The Depository Trust Company, or DTC, or its nominee, and any such interests may not be exchanged for certificated Debentures except in limited circumstances. For information regarding conversion, registration of transfer and exchange of global Debentures held in DTC, see “— Form, Denomination and Registration — Global Debentures, Book-Entry Form.”

      If certificated Debentures are issued, you may present them for conversion, registration of transfer and exchange, without service charge, at our office or agency in New York City, which will initially be the office or agency of the trustee in New York City.

Payment at Maturity

      On the maturity date, each holder will be entitled to receive on such date $1,000 in cash for each $1,000 in principal amount of Debentures, together with premium, if any, and accrued and unpaid interest (including contingent interest and additional interest, if any) to, but not including, the maturity date. With respect to global Debentures, principal and interest (including contingent interest and additional interest, if any) will be paid to DTC in immediately available funds. With respect to any certificated Debentures, principal, premium, if any, and interest (including contingent interest and additional interest, if any) will be payable at our office or agency in New York City, which initially will be the office or agency of the trustee in New York City.

Interest

      The Debentures bear interest at a rate of 2.625% per year. Interest will accrue from September 27, 2005, or from the most recent date to which interest has been paid or duly provided for. Beginning with the six-month interest period commencing October 15, 2010, we will pay contingent interest under certain circumstances as described under “— Contingent Interest.” We will pay interest (including contingent interest and additional interest, if any) semi-annually, in arrears on April 15 and October 15 of each year, commencing on April 15, 2006, to holders of record at 5:00 p.m., New York City time, on the preceding April 1 and October 1, respectively. However, there are two exceptions to the preceding sentence:

      We will pay interest on:

      Interest will be calculated on the basis of a 360-day year consisting of twelve 30-day months. If a payment date is not a business day, payment will be made on the next succeeding business day, and no additional interest will accrue thereon.

      To the extent lawful, payments of principal, premium or interest (including contingent interest and additional interest, if any) on the Debentures that are not made when due will accrue interest at the annual rate of 1% above the then applicable interest rate from the required payment date.

Contingent Interest

      Beginning with the six-month interest period commencing October 15, 2010, we will pay contingent interest during any six-month interest period to the holders of the Debentures if the trading price of the Debentures for each of the five trading days ending on the second trading day immediately preceding the first day of the applicable six-month interest period equals or exceeds 120% of the principal amount of the Debentures.

      During any six-month period when contingent interest shall be payable, the contingent interest payable per $1,000 principal amount of the Debentures will equal 0.25% of the average trading price of $1,000 principal amount of Debentures during the five trading days ending on the second trading day immediately preceding the first day of the applicable six-month interest period.

      “Trading price” for purposes of determining contingent interest shall have the meaning set forth under “— Conversion Rights — Conversion Upon Satisfaction of Trading Price Condition,” except that, for purposes of determining the trading price for the contingent interest provisions only, if the trustee cannot reasonably obtain at least one bid for $5,000,000 principal amount of the Debentures from a nationally recognized securities dealer, then the trading price per $1,000 principal amount of the Debentures will be deemed to equal the product of:

      We will notify holders by issuing a press release prior to the beginning of any six-month interest period that they will be entitled to receive contingent interest during such six-month interest period.

Subsidiary Guarantee

      WESCO Distribution, as primary obligor and not merely as surety, has irrevocably and unconditionally guaranteed on an unsecured senior subordinated basis the performance and full and punctual payment when due, whether at stated maturity, by acceleration or otherwise, of all obligations of WESCO International under the indenture and the Debentures, whether for payment of principal of or interest on (including contingent interest or additional interest, if any) the Debentures, expenses, indemnification or otherwise (all such obligations guaranteed by WESCO Distribution are referred to herein as the “guaranteed obligations”). WESCO Distribution has agreed to pay, in addition to the amount stated above, any and all costs and expenses (including reasonable counsel fees and expenses) incurred by the trustee or the Debenture holders in enforcing any rights under the WESCO Distribution guarantee. The WESCO Distribution guarantee is limited in amount to an amount not to exceed the maximum amount that can be guaranteed by WESCO Distribution without rendering the indenture, as it relates to WESCO Distribution, voidable under applicable law relating to fraudulent conveyance or fraudulent transfer or similar laws affecting the rights of creditors generally. See “Risk Factors — The guarantees may be unenforceable due to fraudulent conveyance statutes, and accordingly you could have no claim against the guarantors.”

      The guarantor may, without the consent of the holders of Debentures, consolidate with, merge with or into or transfer all or substantially all of their assets to any other person organized under the laws of the United States or any of its political subdivisions provided that:

      The guarantee of the payment of principal of, premium and additional interest, if any, and interest (including contingent interest and additional interest, if any) on the Debentures is subordinated in right of payment, as set forth in the indenture, to all existing and future Senior Indebtedness of WESCO Distribution, ranks pari passu in right of payment with all existing and future Senior Subordinated Indebtedness of WESCO Distribution and is senior in right of payment to all existing and future Subordinated Obligations of WESCO Distribution. The Debentures also are effectively subordinated to any Secured Indebtedness of WESCO Distribution and its subsidiaries to the extent of the value of the assets securing such indebtedness and are effectively subordinated to all other obligations of the subsidiaries of WESCO Distribution.

      We conduct certain of our operations through subsidiaries of WESCO Distribution. Claims of creditors of such subsidiaries, including trade creditors, and claims of preferred stockholders (if any) of such subsidiaries generally have priority with respect to the assets and earnings of such subsidiaries over the claims of creditors of WESCO Distribution, including the holders of Debentures by virtue of the guarantee of WESCO Distribution. The Debentures, therefore, are effectively subordinated to creditors (including trade creditors) and preferred stockholders (if any) of subsidiaries of WESCO Distribution. As of December 31, 2005 on an as adjusted basis, the subsidiaries of WESCO Distribution had $212 million of Indebtedness, excluding guarantees of indebtedness under the revolving credit facility, but had trade payables and other liabilities incurred in the ordinary course of business. The indenture does not limit the incurrence of indebtedness by and the issuance of preferred stock by any of WESCO Distribution’s subsidiaries.

      As of December 31, 2005:

The indenture does not limit the incurrence of indebtedness by and the issuance of preferred stock by WESCO Distribution.

      With respect to WESCO Distribution, “Senior Indebtedness” means the principal of, premium (if any) and accrued and unpaid interest on (including interest accruing on or after the filing of any petition in bankruptcy or for reorganization of WESCO Distribution, regardless of whether or not a claim for post-filing interest is allowed in such proceedings), and fees and other amounts owing in respect of, Bank Indebtedness and all other indebtedness of WESCO Distribution, whether outstanding on the first closing date or thereafter Incurred, unless in the instrument creating or evidencing the same or pursuant to which the same is outstanding it is provided that such obligations are not superior in right of payment to the guaranteed obligations; provided, however, that Senior Indebtedness does not include:

      “Bank Indebtedness” means any and all amounts payable under or in respect of the Credit Agreement and any Refinancing Indebtedness with respect thereto, as amended, restated, supplemented, waived, refinanced, replaced, renewed, extended or otherwise modified from time to time, including principal, premium (if any), interest (including interest accruing on or after the filing of any petition in bankruptcy or for reorganization relating to WESCO Distribution whether or not a claim for post-filing interest is allowed in such proceedings), fees, charges, expenses, reimbursement obligations, Guarantees and all other amounts payable thereunder or in respect thereof.

      “Credit Agreement” means the amended and restated credit agreement dated as of June 17, 2005 among WESCO Distribution, the other Credit Parties (as defined therein) party thereto, General Electric Capital Corporation, for itself as lender and as agent for lenders, the CIT Group/ Business Credit, Inc., as syndication agent and lender and the other lenders party thereto from time to time, as amended, restated, supplemented, waived, refinanced, replaced, renewed, extended or otherwise modified from time to time.

      “Designated Senior Indebtedness” of WESCO Distribution means (i) the Bank Indebtedness and (ii) any other Senior Indebtedness of WESCO Distribution that, at the date of determination, has an aggregate principal amount outstanding of, or under which, at the date of determination, the holders thereof are committed to lend up to at least $25.0 million and is specifically designated by WESCO Distribution in the instrument evidencing or governing such Senior Indebtedness as “Designated Senior Indebtedness” for purposes of the indenture.

      “Refinancing Indebtedness” means indebtedness that is incurred to refund, refinance, replace, renew, repay or extend (including pursuant to any defeasance or discharge mechanism) any indebtedness of WESCO Distribution or any Restricted Subsidiary existing on the closing date of this offering or incurred in compliance with the Note indenture (including indebtedness of WESCO Distribution that refinances Refinancing Indebtedness); provided, however, that (i) the Refinancing Indebtedness has a stated maturity no earlier than the stated maturity of the indebtedness being refinanced, (ii) the Refinancing Indebtedness has an average life at the time such Refinancing Indebtedness is Incurred that is equal to or greater than the average life of the Indebtedness being refinanced and (iii) such Refinancing Indebtedness is Incurred in an aggregate principal amount (or if issued with original issue discount, an aggregate issue price) that is equal to or less

than the aggregate principal amount (or if issued with original issue discount, the aggregate accreted value) then outstanding of the indebtedness being refinanced (plus any accrued interest and premium thereon and reasonable expenses incurred in connection therewith); provided further, however, that Refinancing Indebtedness shall not include (x) Indebtedness of a Restricted Subsidiary (as defined in the indenture) that Refinances Indebtedness of WESCO Distribution or (y) indebtedness of WESCO Distribution or a Restricted Subsidiary that refinances indebtedness of an Unrestricted Subsidiary (as defined in the indenture).

      “Subordinated Obligation” means any indebtedness of WESCO Distribution (whether outstanding on the closing date or thereafter incurred) that is subordinate or junior in right of payment to the WESCO Distribution guarantee pursuant to a written agreement.

      Only indebtedness of WESCO Distribution that is Senior Indebtedness ranks senior to the guarantee in accordance with the provisions of the indenture. The guarantee is in all respects rank pari passu with all other Senior Subordinated Indebtedness of WESCO Distribution, including WESCO Distribution’s senior subordinated notes. WESCO Distribution has agreed in the indenture that it will not incur, directly or indirectly, any indebtedness which is subordinate or junior in ranking in any respect to Senior Indebtedness unless such Indebtedness is Senior Subordinated Indebtedness or is expressly subordinated in right of payment to Senior Subordinated Indebtedness. Unsecured Indebtedness is not deemed to be subordinate or junior to Secured Indebtedness merely because it is unsecured.

      WESCO Distribution may not pay principal of, premium (if any) or interest (including contingent interest and additional interest, if any) in respect of the guarantee of the Debentures, and may not otherwise repurchase, redeem or otherwise retire any Debentures (collectively, “pay its guarantee”) if:

However, WESCO Distribution may make payment in respect of its guarantee without regard to the foregoing, if WESCO Distribution and the trustee receive written notice approving such payment from the representative of the Designated Senior Indebtedness with respect to which either of the events set forth above has occurred and is continuing. During the continuance of any default (other than a default described in the preceding paragraph) with respect to any Designated Senior Indebtedness pursuant to which the maturity thereof may be accelerated immediately without further notice (except such notice as may be required to effect such acceleration) or the expiration of any applicable grace periods, WESCO Distribution may not pay its guarantee for a period, referred to as “Payment Blockage Period,” commencing upon the receipt by the trustee (with a copy to WESCO Distribution) of written notice, or “Blockage Notice,” of such default from the representative of such Designated Senior Indebtedness specifying an election to effect a Payment Blockage Period and ending 179 days thereafter (or earlier if such Payment Blockage Period is terminated by written notice to the Trustee and WESCO Distribution from the Person or Persons who gave such Blockage Notice, by repayment in full in cash or cash equivalents of such Designated Senior Indebtedness or because the default giving rise to such Blockage Notice is no longer continuing). Notwithstanding the provisions described in the immediately preceding sentence (but subject to the provisions contained in the first sentence of this paragraph), unless the holders of such Designated Senior Indebtedness or the Representative of such holders have accelerated the maturity of such Designated Senior Indebtedness, WESCO Distribution may resume payments on its guarantee after the end of such Payment Blockage Period. Not more than one Blockage Notice may be given in any consecutive 360-day period, irrespective of the number of defaults with respect to Designated Senior Indebtedness during such period. However, if any Blockage Notice within such 360-day period is given by or on behalf of any holders of Designated Senior Indebtedness other than the Bank Indebtedness, the representative of the Bank Indebtedness may give another Blockage Notice within such period. In no event, however, may the total number of days during which any Payment Blockage Period or Periods is in effect exceed 179 days in the aggregate during any 360 consecutive day period. For purposes of this paragraph, no default or event of default that existed or was continuing on the date of the

commencement of any Payment Blockage Period with respect to the Designated Senior Indebtedness initiating such Payment Blockage Period shall be, or be made, the basis of the commencement of a subsequent Payment Blockage Period by the Representative of such Designated Senior Indebtedness, whether or not within a period of 360 consecutive days, unless such default or event of default has been cured or waived for a period of not less than 90 consecutive days.

      Upon any payment or distribution of the assets of WESCO Distribution to creditors upon a total or partial liquidation or a total or partial dissolution of WESCO Distribution or in a bankruptcy, reorganization, insolvency, receivership or similar proceeding relating to WESCO Distribution or its property, (1) the holders of Senior Indebtedness of WESCO Distribution will be entitled to receive payment in full in cash or cash equivalents of such Senior Indebtedness before the holders of the Debentures, pursuant to the guarantee, are entitled to receive any payment of principal of, premium (if any) or interest (including contingent interest and additional interest, if any) in respect of the guarantee of the Debentures and (2) until such Senior Indebtedness is paid in full in cash or cash equivalents, any payment or distribution to which holders of the Debentures would be entitled in relation to the guarantee but for the subordination provisions of the indenture will be made to holders of such Senior Indebtedness as their interests may appear. If a distribution is made to holders of the Debentures that due to the subordination provisions of the indenture should not have been made to them, such holders are required to hold it in trust for the holders of Senior Indebtedness of WESCO Distribution and pay it over to them as their interests may appear.

      If payment of the Debentures is accelerated because of an Event of Default, WESCO Distribution or the trustee shall promptly notify the holders of the Designated Senior Indebtedness (or their Representative) of the acceleration. If any Designated Senior Indebtedness is outstanding, WESCO Distribution may not pay the Debentures until five Business Days after such holders or the Representative of the Designated Senior Indebtedness receive notice of such acceleration and, thereafter, may pay the Debentures only if the subordination provisions of the indenture otherwise permit payment at that time.

      By reason of these subordination provisions contained in the indenture in relation to the guarantee, in the event of insolvency, creditors of WESCO Distribution who are holders of Senior Indebtedness of WESCO Distribution may recover more, ratably, than the holders of the Debentures, and creditors of WESCO Distribution who are not holders of Senior Indebtedness of WESCO Distribution or who are holders of Senior Subordinated Indebtedness of WESCO Distribution (including the Debentures by virtue of the guarantee of WESCO Distribution) may recover less, ratably, than holders of Senior Indebtedness of WESCO Distribution.

Conversion Rights

      Holders may convert their Debentures prior to the close of business on the trading day immediately preceding the maturity date based on an initial conversion rate of 23.8872 shares of common stock per $1,000 principal amount of Debentures (equivalent to an initial conversion price of approximately $41.86 per share), only if the conditions for conversion described below are satisfied. The conversion rate is subject to adjustment as described below. As described under “— Conversion Procedures — Settlement Upon Conversion,” upon conversion of Debentures, we will pay cash and shares of our common stock, if any, based on a daily conversion value calculated on a proportionate basis for each day of the 20 trading-day cash settlement averaging period. Unless we have previously redeemed or purchased the Debentures, you will have the right to convert any portion of the principal amount of any Debentures that is an integral multiple of $1,000 at any time on or prior to the close of business on the trading day immediately preceding the maturity date only under the following circumstances:

      In the case of clauses (4) and (5) immediately above, we will notify you at least 20 calendar days prior to the ex-dividend date for such distribution; once we have given such notice, you may surrender your Debentures for conversion at any time until the earlier of 5:00 p.m., New York City time, on the business day preceding the ex-dividend date and any announcement by us that such distribution will not take place; in the case of a distribution identified in clauses (4) and (5) immediately above, you may not convert your Debentures if you will otherwise participate in the distribution without conversion as a result of holding the Debentures.

      The “closing sale price” of any share of our common stock on any trading date means the closing sale price of such security (or if no closing sale price is reported, the average of the closing bid and closing ask prices or, if more than one in either case, the average of the average closing bid and the average closing ask prices) on such date as reported in composite transactions for the principal U.S. securities exchange on which our common stock is traded or, if our common stock is not listed on a U.S. national or regional securities exchange, as reported by the Nasdaq System or by Pink Sheets LLC. In the absence of such a quotation, the closing sale price by a nationally recognized securities dealer retained by us for that purpose. The closing sale price will be determined without reference to extended or after hours trading. The “conversion price” on any day will equal $1,000 divided by the conversion rate in effect on that day.

      Except as provided in the next paragraph, upon conversion, you will not receive any separate cash payment of accrued and unpaid interest (including contingent interest or additional interest, if any, but excluding any additional interest) on the Debentures. Accrued and unpaid interest (including contingent interest or additional interest, if any, but excluding any additional interest) and accrued tax original issue discount, if any, to the conversion date is deemed to be paid in full with the shares of our common stock issued or cash paid upon conversion rather than cancelled, extinguished or forfeited.

      If you convert after the record date for an interest payment but prior to the corresponding interest payment date, you will receive on the corresponding interest payment date the interest (including contingent interest and additional interest, if any) accrued and unpaid on your Debentures, notwithstanding your conversion of those Debentures prior to the interest payment date, assuming you were the holder of record on the corresponding record date. However, except as provided in the next sentence, at the time you surrender your Debentures for conversion, you must pay us an amount equal to the interest (including contingent

interest, if any, but excluding any additional interest) that has accrued and will be paid on the Debentures being converted on the corresponding interest payment date. You are not required to make such payment:

      Except as described under “— Conversion Rate Adjustments,” we will not make any payment or other adjustment for dividends on any common stock issued upon conversion of the Debentures.

      We will not issue fractional shares of our common stock upon conversion of the Debentures. Instead, we will pay cash in lieu of fractional shares based on the closing sale price of our common stock on the trading day immediately preceding the conversion date.

      You will have the right to convert your Debentures if we:

      We will notify you at least 20 calendar days prior to the ex-dividend date for such distribution. Once we have given such notice, you may surrender your Debentures for conversion at any time until the earlier of 5:00 p.m., New York City time, on the business day preceding the ex-dividend date or any announcement by us that such distribution will not take place. You may not convert any of your Debentures based on this conversion contingency if you will otherwise participate in the distribution without conversion as a result of holding the Debentures.

      You will also have the right to convert your Debentures if we are a party to a consolidation, merger, binding share exchange or sale or conveyance of all or substantially all of our property and assets not constituting a fundamental change, in each case pursuant to which our common stock would be converted into cash, securities and/or other property. In such event, you will have the right to convert your Debentures at any time beginning 15 calendar days prior to the date announced by us as the anticipated effective date of the transaction and until and including the date which is 15 calendar days after the date that is the actual effective date of such transaction. If you do not convert your Debentures during this period, you will generally be entitled to receive, upon subsequent conversion, if any, the kind and amount of cash, securities and other property that you would have received if you had converted your Debentures immediately prior to the transaction.

      If a fundamental change (as defined under “— Repurchase at Option of the Holder — Fundamental Change Put”) occurs, you will have the right to convert your Debentures at any time beginning on the business day following the effective date of the fundamental change until 5:00 p.m., New York City time, on

the business day preceding the repurchase date relating to such fundamental change. We will notify you of the anticipated effective date of any fundamental change at least 10 calendar days prior to such date. If you convert your Debentures in connection with a fundamental change, you will receive:

      If you have submitted any or all of your Debentures for repurchase, unless you have withdrawn such Debentures in a timely fashion, your conversion rights on the Debentures so subject to repurchase will expire at 5:00 p.m., New York City time, on the business day preceding the repurchase date, unless we default in the payment of the repurchase price. If you have submitted any Debentures for repurchase, such Debentures may be converted only if you submit a withdrawal notice, and if the Debentures are evidenced by global Debentures, you comply with appropriate DTC procedures.

      You may surrender your Debentures for conversion prior to maturity during the five trading-day period following any five consecutive trading-day period in which the “trading price” per $1,000 principal amount of Debentures, as determined following a request by a holder of Debentures in accordance with the procedures described below, for each trading day of such five trading-day period was less than 98% of the product of the closing sale price of our common stock and the then current conversion rate for each day of such five-day trading period.

      The “trading price” of the Debentures on any date of determination means the average of the secondary market bid quotations per $1,000 principal amount of Debentures obtained by the trustee for $5,000,000 principal amount of the Debentures at approximately 3:30 p.m., New York City time, on such determination date from two independent nationally recognized securities dealers we select, which may include one or more of the initial purchasers, provided that if at least two such bids cannot reasonably be obtained by the trustee, but one such bid can reasonably be obtained by the trustee, this one bid will be used. If the trustee cannot reasonably obtain at least one bid for $5,000,000 principal amount of the Debentures from a nationally recognized securities dealer, then, for purposes of the trading price condition only, the trading price of the Debentures will be deemed to be less than 98% of the applicable conversion rate of the Debentures multiplied by the closing sale price of our common stock on such determination date.

      The trustee will determine the trading price of the Debentures upon our request. We will have no obligation to make that request unless a holder of Debentures requests that we do so. If a holder provides such request, we will instruct the trustee to determine the trading price of the Debentures for the applicable period.

      If you hold a beneficial interest in global Debentures, to convert you must deliver to DTC the appropriate instruction form for conversion pursuant to DTC’s conversion program and, if required, pay funds equal to interest payable (including contingent interest or additional interest, if any, but excluding any additional interest) on the next interest payment date to which you are not entitled and, if required, pay all taxes or duties, if any.

      If you hold certificated Debentures, to convert you must:

      The conversion date will be the date on which you have satisfied all of the foregoing requirements. The Debentures will be deemed to have been converted immediately prior to 5:00 p.m., New York City time, on the conversion date.

      You will not be required to pay any taxes or duties relating to the issuance or delivery of our common stock if you exercise your conversion rights, but you will be required to pay any tax or duty that may be payable relating to any transfer involved in the issuance or delivery of the common stock in a name other than your own. Certificates representing common stock will be issued and delivered only after all applicable taxes and duties, if any, payable by you have been paid in full.

      Upon conversion, we will deliver to holders in respect of each $1,000 principal amount of Debentures being converted a “settlement amount” equal to the sum of the daily settlement amounts (as defined below) for each of the twenty trading days during the cash settlement averaging period.

      The “cash settlement averaging period” with respect to any Debentures means the 20 consecutive trading-day period beginning on and including the second trading day after you deliver your conversion notice to the conversion agent, except that with respect to any notice of conversion received after the date of issuance of a notice of redemption as described under “— Optional redemption,” the “cash settlement averaging period” means the 20 consecutive trading days beginning on and including the twenty-third scheduled trading day prior to the applicable redemption date and except that with respect to any conversion arising solely by reason of the occurrence of a fundamental change, the “cash settlement averaging period” means the 20 consecutive trading days beginning on and including the twenty-third scheduled trading day prior to the fundamental change repurchase date.

      “Daily settlement amount,” for each $1,000 principal amount of Debentures, for each of the twenty trading days during the cash settlement averaging period, shall consist of:

      “Daily conversion value” means, for each of the 20 consecutive trading days during the cash settlement averaging period, one-twentieth (1/20) of the product of (1) the applicable conversion rate and (2) the closing sale price of our common stock (or the consideration into which our common stock has been converted in connection with certain corporate transactions) on such day.

      “Trading day” means a day during which (i) trading in our common stock generally occurs, (ii) there is no market disruption event and (iii) a closing sale price for our common stock is provided on the New York Stock Exchange or, if our common stock is not listed on the New York Stock Exchange, on the principal other U.S. national or regional securities exchange on which our common stock is then listed or, if our

common stock is not listed on a U.S. national or regional securities exchange, on the principal other market on which our common stock is then traded.

      “Market disruption event” means the occurrence or existence during the one-half hour period ending on the scheduled close of trading on any trading day for our common stock of any material suspension or limitation imposed on trading (by reason of movements in price exceeding limits permitted by the stock exchange or otherwise) in our common stock or in any options, contracts or future contracts relating to our common stock.

      We will deliver the settlement amount to converting holders on the third business day immediately following the last day of the applicable cash settlement averaging period.

      We will deliver cash in lieu of any fractional shares of common stock issuable in connection with payment of the settlement amount.

      We will adjust the conversion rate for certain events, including:

However, the adjustment referred to in this clause (7) will generally not be made if, as of the closing of the offer, the offering documents disclose a plan or an intention to cause us to engage in a consolidation or merger or sale of all or substantially all of our assets.

      For purposes of clause (3) and (5) above, “current market price” means the average closing sale price of our common stock for the 10 consecutive trading days immediately prior to the record date for the distribution requiring such computation.

      To the extent that any future rights plan adopted by us is in effect upon conversion of the Debentures into common stock only or a combination of cash and common stock, you will receive, in addition to the common stock, the rights under the applicable rights agreement unless the rights have separated from our common stock at the time of conversion of the Debentures, in which case, the conversion rate will be adjusted as if we distributed to all holders of our common stock shares of our capital stock, evidences of indebtedness or assets as described above in clause (4), subject to readjustment in the event of the expiration, termination or redemption of such rights.

      We will not make any adjustment if holders may participate in the transaction or in certain other cases. In cases where the fair market value of assets, debt securities or certain rights, warrants or options to purchase our securities, applicable to one share of common stock, distributed to stockholders:

rather than being entitled to an adjustment in the conversion price, the holder of a Debenture will be entitled to receive upon conversion, in addition to the shares of common stock, the kind and amount of assets, debt securities or rights, warrants or options comprising the distribution that such holder would have received if such holder had converted such Debentures solely into common stock immediately prior to the record date for determining the stockholders entitled to receive the distribution.

      Except as stated above, we will not adjust the conversion rate for the issuance of our common stock or any securities convertible into or exchangeable for our common stock or carrying the right to purchase any of the foregoing.

      In the event that we distribute shares of capital stock of a subsidiary of ours pursuant to clause (4) above, the conversion rate will be adjusted, if at all, based on the market value of the subsidiary stock so distributed relative to the market value of our common stock, in each case over a measurement period following the distribution.

      If we:

     

and the holders of our common stock receive stock, other securities or other property or assets (including cash or any combination thereof) with respect to or in exchange for their common stock, each outstanding Debenture will, without the consent of any holders of the Debentures, become convertible only into the cash and other consideration the holders of the Debentures would have received if they had converted their Debentures immediately prior to such reclassification, change, consolidation, merger, sale, lease, transfer, conveyance or other disposition (assuming such holder of common stock received proportionately the same consideration received by all common stock holders in the aggregate), except in the limited case of a public acquirer change of control where we elect to have the Debentures convertible into public acquirer common stock as described below under “— Conversion After a Public Acquirer Change of Control” and except that the provisions above under “— Settlement Upon Conversion” relating to the satisfaction of the conversion obligation shall continue to apply with the daily conversion value calculated based on the consideration received in such transaction. We may not become a party to any such transaction unless its terms are consistent with the foregoing.

      If a taxable distribution to holders of our common stock or other transaction occurs that results in any adjustment of the conversion rate (including an adjustment at our option), you may, in certain circumstances, be deemed to have received a distribution subject to U.S. income tax as a dividend. In certain other circumstances, the absence of an adjustment may result in a taxable dividend to the holders of our common stock. See “Certain U.S. Federal Income and Estate Tax Considerations.”

      We may from time to time, to the extent permitted by law, increase the conversion rate of the Debentures by any amount for any period of at least 20 business days. In that case, we will give at least 15 days prior notice of such increase. We may make such increases in the conversion rate, in addition to those set forth above, as our board of directors deems advisable to avoid or diminish any income tax to holders of our common stock resulting from any dividend or distribution of stock (or rights to acquire stock) or from any event treated as such for income tax purposes.

      We will not be required to make an adjustment in the conversion rate unless the adjustment would require a change of at least 1% in the conversion rate. However, we will carry forward any adjustment that is less than 1% of the conversion rate, take such carried-forward adjustments into account in any subsequent adjustment, and make such carried-forward adjustments, regardless of whether the aggregate adjustment is less than 1%, (a) annually on the anniversary of the first date of issue of the Debentures and (b) otherwise (1) five business days prior to the maturity of the Debentures (whether at stated maturity or otherwise) or (2) prior to the redemption date or repurchase date, unless such adjustment has already been made.

      If we adjust the conversion rate pursuant to the above provisions, we will issue a press release through Business Wire containing the relevant information and make this information available on our website or through another public medium as we may use at that time.

      Prior to October 15, 2010, if and only to the extent you elect to convert your Debentures in connection with a transaction described under clause (1) or clause (4) under the definition of a fundamental change described below under “— Repurchase at Option of the Holder — Fundamental Change Put” pursuant to which 10% or more of the consideration for our common stock (other than cash payments for fractional shares and cash payments made in respect of dissenters’ appraisal rights) in such fundamental change transaction consists of cash or securities (or other property) that are not shares of common stock, depositary receipts or other certificates representing common equity interests traded or scheduled to be traded immediately following such transaction on a U.S. national securities exchange or The Nasdaq National Market, which we refer to as a “non-stock change of control,” we will increase the conversion rate as described below. The number of additional shares by which the conversion rate is increased (the “additional shares”) will be determined by reference to the table below, based on the date on which the non- stock change of control becomes effective (the “effective date”) and the price (the “stock price”) paid per share for our common stock in such non-stock change of control. If holders of our common stock receive only cash in such transaction, the price paid per share will be the cash amount paid per share. Otherwise, the price paid

per share will be the average of the closing sale prices of our common stock on the five trading days prior to but not including the effective date of such non-stock change of control. We will notify you of the anticipated effective date of any fundamental change at least 20 calendar days prior to such date.

      A conversion of the Debentures by a holder will be deemed for these purposes to be “in connection with” a non-stock change of control if the conversion notice is received by the conversion agent following the effective date of the non-stock change of control but before 5:00 p.m., New York City time, on the business day immediately preceding the related repurchase date (as specified in the repurchase notice described under “— Repurchase at the Option of the Holder — Fundamental Change Put”).

      The number of additional shares will be adjusted in the same manner as and as of any date on which the conversion rate of the Debentures is adjusted as described above under “— Conversion Rate Adjustments.” The stock prices set forth in the first row of the table below (i.e., the column headers) will be simultaneously adjusted to equal the stock prices immediately prior to such adjustment, multiplied by a fraction, the numerator of which is the conversion rate immediately prior to the adjustment and the denominator of which is the conversion rate as so adjusted.

      The following table sets forth the number of additional shares by which the conversion rate shall be adjusted:

      The exact stock price and effective dates may not be set forth on the table, in which case, if the stock price is:

      Notwithstanding the foregoing, in no event will the total number of shares of common stock issuable upon conversion exceed 32.2476 per $1,000 principal amount of the Debentures, subject to adjustments in the same manner as the conversion rate.

      Any conversion that entitles the converting holder to an adjustment to the conversion rate as described in this section shall be settled as described under “— Settlement Upon Conversion” above.

      Notwithstanding the foregoing, in the case of a non-stock change of control constituting a public acquirer change of control (as defined below), we may, in lieu of issuing additional shares upon conversion as described in “— Adjustment to Conversion Rate Upon a Non-Stock Change of Control” above, elect to adjust our conversion obligation and the conversion rate such that from and after the effective date of such public acquirer change of control, holders of the Debentures will be entitled to convert their Debentures

(subject to the satisfaction of certain conditions) into cash and shares of public acquirer common stock (as defined below), and the conversion rate in effect immediately before the public acquirer change of control will be adjusted by multiplying it by a fraction:

      A “public acquirer change of control” means a non-stock change of control in which the acquirer has a class of common stock traded on a U.S. national securities exchange or quoted on the Nasdaq National Market or that will be so traded or quoted when issued or exchanged in connection with such non-stock change of control (the “public acquirer common stock”). If an acquirer does not itself have a class of common stock satisfying the foregoing requirement, it will be deemed to have “public acquirer common stock if a corporation that directly or indirectly owns at least a majority of the acquirer has a class of common stock satisfying the foregoing requirement, provided that such corporation fully and unconditionally guarantees the Debentures, in which case all references to public acquirer common stock will refer to such class of common stock. Majority owned for these purposes means having “beneficial ownership” (as defined in Rule 13d-3 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) of more than 50% of the total voting power of all shares of the respective entity’s capital stock that are entitled to vote generally in the election of directors.

      Upon a public acquirer change of control, if we so elect, holders may convert their Debentures (subject to the satisfaction of the conditions to conversion described under “— Conversion Procedures — Procedures to be Followed by a Holder” above) for cash and public acquirer common stock at the adjusted conversion rate described in the second preceding paragraph but will not be entitled to receive additional shares upon conversion as described under “— Adjustment to Conversion Rate Upon a Non-Stock Change of Control.” We are required to notify holders of our election in our notice to holders of such transaction. Following any such election, the provisions set forth herein, including those set forth under “— Settlement Upon Conversion” shall continue to apply except that reference to our common stock shall be deemed to refer to the public acquirer common stock. In addition, upon a public acquirer change of control, in lieu of converting the Debentures, the holder can, subject to certain conditions, require us to repurchase all or a portion of the Debentures owned by the holder as described below under “— Repurchase at Option of the Holders — Fundamental Change Put.”

      At any time on or after October 15, 2010, we may redeem all or a part of the Debentures at a redemption price equal to 100% of the principal amount of the Debentures. In addition, we will pay interest (including contingent interest and additional interest, if any), on the Debentures being redeemed. This interest (including contingent interest and additional interest, if any), will include such interest accrued and unpaid to, but excluding, the redemption date. However, if the redemption date is after a record date and on or prior to the corresponding interest payment date, the interest (including contingent interest or additional interest, if any) and additional interest, if any, will be paid on the redemption date to the holder of record on the record date.

      We will give notice of redemption not less than 30 nor more than 60 days prior to the redemption date to all record holders of Debentures at their addresses set forth in the register of the registrar. This notice will state, among other things:

      If we do not redeem all of the Debentures, the trustee will select the Debentures to be redeemed in principal amounts of $1,000 or integral multiples of $1,000 by lot, pro rata or by another method the trustee considers fair and appropriate. If any Debentures are to be redeemed in part only, we will issue a new Debenture in principal amount equal to the unredeemed principal portion thereof. If a portion of your Debentures is selected for partial redemption and you convert a portion of your Debentures, the converted portion will be deemed to be taken from the portion selected for redemption.

      Additionally, we will not be required to:

      We may not redeem the Debentures if we have failed to pay interest on the Debentures and such failure to pay is continuing.

Repurchase at the Option of the Holder

      On October 15, 2010, October 15, 2015 and October 15, 2020, you will have the right to require us to repurchase, at the repurchase price described below, all or part of your Debentures for which you have properly delivered and not withdrawn a written repurchase notice. The Debentures submitted for repurchase must be $1,000 in principal amount or whole multiples thereof.

      The repurchase price will be payable in cash and will equal 100% of the principal amount of the Debentures being repurchased, plus accrued and unpaid interest (including contingent interest and additional interest, if any) to, but excluding, the repurchase date. However, if the repurchase date is after a record date and on or prior to the corresponding interest payment date, the interest (including contingent interest and additional interest, if any) will be paid on the repurchase date to the holder of record on the record date.

      We may be unable to repurchase your Debentures upon your exercise of your repurchase right. Our ability to repurchase Debentures in cash in the future may be limited by the terms of our then-existing borrowing agreements. Accordingly, we cannot assure you that we would have the financial resources, or would be able to arrange financing, to pay the repurchase price in cash.

      We will give notice at least 20 business days prior to each repurchase date to all record holders at their addresses shown in the register of the registrar and to beneficial owners as required by applicable law. This notice will state, among other things, the procedures that you must follow to require us to repurchase your Debentures.

      To exercise your repurchase right, you must deliver at any time from 9:00 a.m., New York City time, on the date that is 20 business days prior to the applicable repurchase date to 5:00 p.m., New York City time, on the applicable repurchase date, a written notice to the paying agent of your exercise of your repurchase right (together with the Debentures to be repurchased, if certificated Debentures have been issued). The repurchase notice must state:

      You may withdraw your repurchase notice at any time prior to 5:00 p.m., New York City time, on the business day immediately preceding the applicable repurchase date, by delivering a written notice of withdrawal to the paying agent. If a repurchase notice is given and withdrawn during that period, we will not be obligated to repurchase the Debentures listed in the repurchase notice. The withdrawal notice must state:

      Payment of the repurchase price for a Debenture for which a repurchase notice has been delivered and not withdrawn is conditioned upon book-entry transfer or delivery of the Debentures, together with necessary endorsements, to the paying agent, as the case may be. Payment of the repurchase price for the Debentures will be made promptly following the later of the repurchase date and the time of book-entry transfer or delivery of the Debentures, as the case may be.

      If the paying agent holds on the repurchase date cash sufficient to pay the repurchase price of the Debentures that holders have elected to require us to repurchase, then, as of the repurchase date:

      In connection with any repurchase, we will, to the extent applicable:

      If a fundamental change (as defined below) occurs at any time prior to the maturity of the Debentures, you will have the right to require us to repurchase, at the repurchase price described below, all or part of your Debentures for which you have properly delivered and not withdrawn a written repurchase notice. The Debentures submitted for repurchase must be $1,000 in principal amount or whole multiples thereof.

      The repurchase price will be payable in cash and will equal 100% of the principal amount of the Debentures being repurchased, plus accrued and unpaid interest (including contingent interest and additional interest, if any) to, but excluding, the repurchase date. However, if the repurchase date is after a record date and on or prior to the corresponding interest payment date, the interest (including contingent interest and additional interest, if any) will be paid on the repurchase date to the holder of record on the record date.

      We may be unable to repurchase your Debentures in cash upon a fundamental change. Our ability to repurchase the Debentures with cash in the future may be limited by the terms of our then-existing borrowing agreements. In addition, the occurrence of a fundamental change could cause an event of default under the terms of our then-existing borrowing agreements. We cannot assure you that we would have the financial resources, or would be able to arrange financing, to pay the repurchase price in cash.

      A “fundamental change” will be deemed to have occurred when any of the following has occurred:

      However, a fundamental change will be deemed not to have occurred if more than 90% of the consideration in the transaction or transactions (other than cash payments for fractional shares and cash payments made in respect of dissenters’ appraisal rights) which otherwise would constitute a fundamental change under clause (1) or (4) above consists of shares of common stock, depositary receipts or other certificates representing common equity interests traded or to be traded immediately following such transaction on a national securities exchange or quoted on the Nasdaq National Market and, as a result of the transaction or transactions, the Debentures become convertible solely into such common stock, depositary receipts or other certificates representing common equity interests (and any rights attached thereto).

      “Continuing directors” means, as of any date of determination, any member of the board of directors of WESCO International who:

      The definition of “fundamental change” includes a phrase relating to the sale, lease, transfer, conveyance or other disposition, in one or a series of related transactions, of all or substantially all of our assets and those of our subsidiaries taken as a whole. Although there is a developing body of case law interpreting the phrase “substantially all,” there is no precise established definition of the phrase under applicable law. Accordingly, the ability of a holder of Debentures to require us to repurchase Debentures as a result of a sale, lease, transfer, conveyance or other disposition of less than all of our assets and those of our subsidiaries taken as a whole to another person or group may be uncertain.

      On or before the fifth calendar day after the occurrence of a fundamental change, we will provide to all record holders of the Debentures on the date of the fundamental change at their addresses shown in the register of the registrar and to beneficial owners to the extent required by applicable law, the trustee and the paying agent, a written notice of the occurrence of the fundamental change and the resulting repurchase right. Such notice shall state, among other things, the event causing the fundamental change and the procedures you must follow to require us to repurchase your Debentures.

      The repurchase date will be a date specified by us in the notice of a fundamental change that is not less than 20 nor more than 35 calendar days after the date of the notice of a fundamental change.

      To exercise your repurchase right, you must deliver, prior to 5:00 p.m., New York City time, on the repurchase date, a written notice to the paying agent of your exercise of your repurchase right (together with the Debentures to be repurchased, if certificated Debentures have been issued). The repurchase notice must state:

      You may withdraw your repurchase notice at any time prior to 5:00 p.m., New York City time, on the business day immediately preceding repurchase date by delivering a written notice of withdrawal to the paying agent. If a repurchase notice is given and withdrawn during that period, we will not be obligated to repurchase the Debentures listed in the repurchase notice. The withdrawal notice must state:

      Payment of the repurchase price for a Debenture for which a repurchase notice has been delivered and not withdrawn is conditioned upon book-entry transfer or delivery of the Debentures, together with necessary endorsements, to the paying agent, as the case may be. Payment of the repurchase price for the Debentures will be made promptly following the later of the repurchase date and the time of book-entry transfer or delivery of the Debentures, as the case may be.

      If the paying agent holds on the repurchase date cash sufficient to pay the repurchase price of the Debentures that holders have elected to require us to repurchase, then, as of the repurchase date:

      In connection with any repurchase, we will, to the extent applicable:

      This fundamental change repurchase right could discourage a potential acquirer of WESCO International. However, this fundamental change repurchase feature is not the result of management’s knowledge of any specific effort to obtain control of us by means of a merger, tender offer, solicitation or otherwise, or part of a plan by management to adopt a series of anti-takeover provisions.

      Our obligation to repurchase the Debentures upon a fundamental change would not necessarily afford you protection in the event of a highly leveraged or other transaction involving us that may adversely affect holders. We also could, in the future, enter into certain transactions, including certain recapitalizations, that would not constitute a fundamental change but would increase the amount of our (or our subsidiaries’) outstanding debt. The incurrence of significant amounts of additional debt could adversely affect our ability to service our then existing debt, including the Debentures.

Consolidation, Merger and Sale of Assets by WESCO International

      The indenture will provide that we will not consolidate with or merge with or into, or sell, convey, transfer or lease all or substantially all its assets to, any person, unless:

      In the event of any transaction described in and complying with the conditions listed in the immediately preceding paragraph in which WESCO International is not the continuing corporation, the successor person formed or remaining shall succeed, and be substituted for, and may exercise every right and power of, WESCO International, and WESCO International shall be discharged from its obligations, under the Debentures, the indenture and the registration rights agreement.

      This covenant includes a phrase relating to the sale, conveyance, transfer and lease of “all or substantially all” of the assets of WESCO International. There is no precise, established definition of the phrase “all or substantially all” under New York law, which governs the indenture and the Debentures, or under the laws of Delaware, WESCO International’s state of incorporation. Accordingly, the ability of a holder of the Debentures to require us to repurchase the Debentures as a result of a sale, conveyance, transfer or lease of less than all of the assets of WESCO International may be uncertain.

      An assumption by any person of WESCO International’s obligations under the Debentures and the indenture might be deemed for U.S. federal income tax purposes to be an exchange of the Debentures for new Debentures by the holders thereof, resulting in recognition of gain or loss for such purposes and possibly other adverse tax consequences to the holders. Holders should consult their own tax advisors regarding the tax consequences of such an assumption.

Events of Default; Notice and Waiver

      An Event of Default is defined in the Debentures indenture as:

      For the purposes of the foregoing provisions, the term “significant subsidiary” means any subsidiary that would be a “significant subsidiary” of WESCO International within the meaning of Rule 1-02 under Regulation S-X promulgated by the SEC, but shall in no event include a Receivables Financing Entity, as such term is defined in the indenture.

      The foregoing will constitute Events of Default whatever the reason for any such Event of Default and whether it is voluntary or involuntary or is effected by operation of law or pursuant to any judgment, decree

or order of any court or any order, rule or regulation of any administrative or governmental body. However, a default under clauses (vi), (vii) or (ix) will not constitute an Event of Default until the trustee or the holders of at least 25% in principal amount of the outstanding Debentures notify WESCO International of the default and WESCO International does not cure such default within the time specified in clauses (vi), (vii) or (ix) hereof after receipt of such notice.

      If an Event of Default (other than an Event of Default relating to certain events of bankruptcy, insolvency or reorganization of WESCO International) occurs and is continuing, the trustee or the holders of at least 25% in principal amount of the outstanding Debentures by notice to WESCO International may declare the principal of and accrued but unpaid interest on all the Debentures to be due and payable. Upon such a declaration, such principal and interest will be due and payable immediately. If an Event of Default relating to certain events of bankruptcy, insolvency or reorganization of WESCO International occurs, the principal of and interest on all the Debentures will become immediately due and payable without any declaration or other act on the part of the trustee or any holders of Debentures. Under certain circumstances, the holders of a majority in principal amount of the outstanding Debentures may rescind any such acceleration with respect to the Debentures and its consequences.

      Subject to the provisions of the indenture relating to the duties of the trustee, in case an Event of Default occurs and is continuing, the trustee will be under no obligation to exercise any of the rights or powers under the indenture at the request or direction of any of the holders of Debentures unless such holders have offered to the trustee reasonable indemnity or security against any loss, liability or expense. Except to enforce the right to receive payment of principal, premium (if any) or interest when due, no holder of Debentures may pursue any remedy with respect to the indenture or the Debentures unless (i) such holder has previously given the trustee notice that an Event of Default is continuing, (ii) holders of at least 25% in principal amount of the outstanding Debentures have requested the trustee in writing to pursue the remedy, (iii) such holders have offered the trustee reasonable security or indemnity against any loss, liability or expense, (iv) the trustee has not complied with such request within 60 days after the receipt of the request and the offer of security or indemnity and (v) the holders of a majority in principal amount of the outstanding Debentures have not given the trustee a direction inconsistent with such request within such 60-day period. Subject to certain restrictions, the holders of a majority in principal amount of the outstanding Debentures are given the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee or of exercising any trust or power conferred on the trustee. The trustee, however, may refuse to follow any direction that conflicts with law or the indenture or that the trustee determines is unduly prejudicial to the rights of any other holder or that would involve the trustee in personal liability. Prior to taking any action under the indenture, the trustee will be entitled to indemnification satisfactory to it in its sole discretion against all losses and expenses caused by taking or not taking such action.

      The indenture provides that if a Default occurs and is continuing and is known to the trustee, the trustee must mail to each holder of Debentures notice of the Default within the earlier of 90 days after it occurs or 30 days after it is known to a trust officer or written notice of it is received by the trustee. Except in the case of a Default in the payment of principal of, premium (if any) or interest (including contingent interest and additional interest, if any) on any Debentures (including payments pursuant to the redemption provisions of such Debentures), the trustee may withhold notice if and so long as a committee of its trust officers in good faith determines that withholding notice is in the interests of the holders of Debentures. In addition, WESCO International is required to deliver to the trustee, within 120 days after the end of each fiscal year of WESCO International, a certificate indicating whether the signers thereof know of any Default that occurred during the previous year. WESCO International also is required to deliver to the trustee, within 30 days after the occurrence thereof, written notice of any event which would constitute certain Events of Default, their status and what action WESCO International is taking or proposes to take in respect thereof.

Amendments and Waivers

      Subject to certain exceptions, the indenture or the Debentures may be amended with the written consent of the holders of at least a majority in principal amount of the Debentures then outstanding and any past

default or compliance with any provisions may be waived with the consent of the holders of a majority in principal amount of the Debentures then outstanding. However, without the consent of each holder of an outstanding Debentures affected, no amendment may, among other things, (i) reduce the principal amount of Debentures whose holders must consent to an amendment, (ii) reduce the rate of or extend the time for payment of interest, contingent interest or additional interest on any Debentures, (iii) reduce the principal of or extend the stated maturity of any Debentures, (iv) reduce the amount payable in relation to the repurchase of any Debentures or change the time at which any Debentures may be put by holders for repurchase by WESCO International as described under “— Repurchase At the Option of the Holder”, (v) reduce any premium payable upon the redemption of any Debentures or change the time at which any Debentures may be redeemed as described under “— Optional Redemption”, (vi) make any Debentures payable in money other than that stated in the Debentures, (vii) make any change affecting the ranking of the Debentures or the guarantee, (viii) impair the right of a holder to institute suit for payment of any Debentures, (ix) adversely affect the right of a holder to convert any Debentures into cash and, if applicable, shares of our common stock (or the extent otherwise applicable, other property receivable upon conversion pursuant to the terms of the indenture) or reduce the conversion rate, except as permitted pursuant to the indenture, (x) make any change adversely affecting the rights of holders of Debentures with respect to the guarantee or (xi) make any change in the amendment provisions which require each holder’s consent or in the waiver provisions.

      Without the consent of any holder, WESCO International and the trustee may amend the indenture to cure any ambiguity, omission, defect or inconsistency, to provide for the assumption by a successor corporation of the obligations of WESCO International under the indenture, to provide for uncertificated Debentures in addition to or in place of certificated Debentures (provided that the uncertificated Debentures are issued in registered form for purposes of Section 163(f) of the Code, or in a manner such that the uncertificated Debentures are described in Section 163(f)(2)(B) of the Code), to make any change in the subordination provisions of the indenture that would limit or terminate the benefits available to any holder of Senior Indebtedness of WESCO Distribution (or any representative thereof) under such subordination provisions, to add additional guarantees with respect to the Debentures, to secure the Debentures, to add to the covenants of WESCO International for the benefit of the holders of Debentures or to surrender any right or power conferred upon WESCO International, to make any change that does not adversely affect the rights of any holder of Debentures, subject to the provisions of the indenture, or to provide for a successor trustee, make any changes or modifications necessary in connection with the registration of the Debentures under the Securities Act as contemplated in the registration rights agreement; provided that such change or modification does not adversely affect the interests of the holders of the Debentures in any material respect, or to comply with any requirement of the SEC in connection with the qualification of the indenture under the Trust Indenture Act. However, no amendment may be made to the subordination provisions of the indenture that adversely affects the rights of any holder of Senior Indebtedness of WESCO Distribution then outstanding unless the holders of such Senior Indebtedness (or any group or representative thereof authorized to give a consent) consent to such change.

      The consent of the holders is not necessary under the indenture to approve the particular form of any proposed amendment. It is sufficient if such consent approves the substance of the proposed amendment.

      After an amendment under the indenture becomes effective, WESCO Distribution is required to mail to holders of Debentures a notice briefly describing such amendment. However, the failure to give such notice to all holders, or any defect therein, will not impair or affect the validity of the amendment.

      Any Debentures held by us or by any person directly or indirectly controlling or controlled by or under direct or indirect common control with us shall be disregarded (from both the numerator and the denominator) for purposes of determining whether the holders of the requisite aggregate principal amount of the outstanding Debentures have consented to a modification, amendment or waiver of the terms of the indenture.

Repurchase and Cancellation

      We may, to the extent permitted by law, repurchase any Debentures in the open market or by tender offer at any price or by private agreement. Any Debentures repurchased by us may, at our option, be surrendered to the trustee for cancellation, but may not be reissued or resold by us. Any Debentures surrendered for cancellation may not be reissued or resold and will be promptly cancelled.

Rule 144A Information

      We will furnish to the holders or beneficial holders of the Debentures or the common stock issued upon conversion and prospective purchasers, upon their request, the information, if any, required under Rule 144A(d)(4) under the Securities Act until such time as such securities are no longer “restricted securities” within the meaning of Rule 144 under the Securities Act, assuming these securities have not been owned by an affiliate of WESCO International.

Information Concerning the Trustee and Common Stock Transfer Agent and Registrar

      We have appointed J.P. Morgan Trust Company, National Association, the trustee under the indenture, as paying agent, conversion agent, Debentures registrar and custodian for the Debentures. The trustee or its affiliates may also provide other services to us in the ordinary course of their business. The indenture contains certain limitations on the rights of the trustee, if it or any of its affiliates is then our creditor, to obtain payment of claims in certain cases or to realize on certain property received on any claim as security or otherwise. The trustee and its affiliates will be permitted to engage in other transactions with us. However, if the trustee or any affiliate continues to have any conflicting interest and a default occurs with respect to the Debentures, the trustee must eliminate such conflict or resign.

      Mellon Investor Services LLC is the transfer agent and registrar for our common stock.

Governing Law

      The Debentures and the indenture shall be governed by, and construed in accordance with, the laws of the State of New York.

Calculations in Respect of the Debentures

      Except as otherwise provided herein, we will be responsible for making all calculations called for under the Debentures. These calculations include, but are not limited to, determinations of the sale price of our common stock, accrued interest payable on the Debentures and the conversion rate and conversion price. We or our agents will make all these calculations in good faith and, absent manifest error, such calculations will be final and binding on holders of the Debentures. We will provide a schedule of these calculations to each of the trustee and the conversion agent, and each of the trustee and conversion agent is entitled to rely upon the accuracy of our calculations without independent verification. The trustee will forward these calculations to any holder of the Debentures upon the request of that holder.

Form, Denomination and Registration

      The Debentures will be issued:

      The Debentures are evidenced by one or more global Debentures. We have deposited the global Debentures with DTC and registered the global Debentures in the name of Cede & Co. as DTC’s nominee.

Except as set forth below, a global Debentures may be transferred, in whole or in part, only to another nominee of DTC or to a successor of DTC or its nominee.

      Beneficial interests in a global Debentures may be held through organizations that are participants in DTC (called “participants”). Transfers between participants will be effected in the ordinary way in accordance with DTC rules and will be settled in clearing house funds. The laws of some states require that certain persons take physical delivery of securities in definitive form. As a result, the ability to transfer beneficial interests in the global Debentures to such persons may be limited.

      Beneficial interests in a global Debentures held by DTC may be held only through participants, or certain banks, brokers, dealers, trust companies and other parties that clear through or maintain a custodial relationship with a participant, either directly or indirectly (called “indirect participants”). So long as Cede & Co., as the nominee of DTC, is the registered owner of a global Debentures, Cede & Co. for all purposes will be considered the sole holder of such global Debentures. Except as provided below, owners of beneficial interests in a global Debentures will:

      We will pay principal of, premium, if any, and interest (including contingent interest and additional interest, if any) on, and the redemption price and the repurchase price of, a global Debentures to Cede & Co., as the registered owner of the global Debentures, by wire transfer of immediately available funds on the maturity date, each interest payment date or the redemption or repurchase date, as the case may be. Neither we, the trustee nor any paying agent will be responsible or liable:

      DTC has advised us that it will take any action permitted to be taken by a holder of the Debentures, including the presentation of the Debentures for conversion, only at the direction of one or more participants to whose account with DTC interests in the global Debentures are credited, and only in respect of the principal amount of the Debentures represented by the global Debentures as to which the participant or participants has or have given such direction.

      DTC has advised us that it is:

      DTC was created to hold securities for its participants and to facilitate the clearance and settlement of securities transactions between participants through electronic book-entry changes to the accounts of its participants. Participants include securities brokers, dealers, banks, trust companies and clearing corporations and other organizations. Some of the participants or their representatives, together with other entities, own DTC. Indirect access to the DTC system is available to others such as banks, brokers, dealers and trust companies that clear through or maintain a custodial relationship with a participant, either directly or indirectly.

      DTC has agreed to the foregoing procedures to facilitate transfers of interests in global Debentures among participants. However, DTC is under no obligation to perform or continue to perform these procedures, and may discontinue these procedures at any time. We will issue the Debentures in definitive certificated form if DTC notifies us that it is unwilling or unable to continue as depositary or DTC ceases to

be a clearing agency registered under the U.S. Securities Exchange Act of 1934, as amended and a successor depositary is not appointed by us within 90 days. In addition, beneficial interests in global Debentures may be exchanged for definitive certificated Debentures upon request by or on behalf of DTC in accordance with customary procedures following the request of a beneficial owner seeking to enforce its rights under such Debentures or the indenture. The indenture permits us to determine at any time and in our sole discretion that Debentures shall no longer be represented by global Debentures. DTC has advised us that, under its current practices, it would notify its participants of our request, but will only withdraw beneficial interests from the global note at the request of each DTC participant. We would issue definitive certificates in exchange for any such beneficial interests withdrawn.

      Neither we, the trustee, registrar, paying agent nor conversion agent will have any responsibility or liability for the performance by DTC or its participants or indirect participants of their respective obligations under the rules and procedures governing their operations.

      The Debentures and shares of common stock that are issued upon conversion will be subject to certain restrictions on transfer, as described below under “Notice to Investors.” The Debentures and share certificates will bear a legend regarding such transfer restrictions.

Registration Rights

      Upon the closing of the private offering, we and the guarantor entered into a resale registration rights agreement with the initial purchasers of the Debentures for the benefit of the holders of the Debentures. Pursuant to the agreement, we and the guarantor agreed, at our expense to use reasonable best efforts to keep the registration statement of which this prospectus is a part effective until the earliest of:

      Each holder who sells securities pursuant to the registration statement of which this prospectus is a part generally will be:

      We may suspend the holder’s use of the prospectus for a period not to exceed 45 days in any 90-day period, and not to exceed an aggregate of 90 days in any 360-day period, if:

However, if the disclosure relates to a previously undisclosed proposed or pending material business transaction or agreement, the disclosure of which would impede our ability to consummate such transaction or agreement, we may extend the suspension period from 45 days to 60 days.

      If,

(each, a “registration default”), then additional interest will accrue on the Debentures, from and including the day following the registration default to but excluding the day on which the registration default has been cured. Additional interest, if any, will be paid semiannually in arrears, in cash, on each April 15 and October 15, and will accrue at a rate per year equal to:

In no event will additional interest accrue at a rate per year exceeding 0.50%. Once you convert your Debentures, you will cease to be entitled to receive any additional interest except as otherwise provided by the terms of the Debentures and the indenture.

      If the registration statement of which this prospectus is a part is not effective, the Debentures may not be sold or otherwise transferred except in accordance with the registration requirements of the Securities Act and any other applicable securities laws, or pursuant to an exemption from registration under the Securities Act and any other applicable securities laws, or in a transaction not subject to such laws.

DESCRIPTION OF CAPITAL STOCK

      The following summary of certain provisions of our capital stock is not complete and may not contain all the information you should consider before investing in the Debentures or our common stock. We encourage you to read our Restated Certificate of Incorporation because such document, and not this summary, defines the rights of holders of our preferred stock and common stock. Our Restated Certificate of Incorporation has been filed as an exhibit to the registration statement of which this prospectus is a part, and you may obtain a copy of our Restated Certificate of Incorporation by the means described under “Where You Can Find More Information.”

Common Stock

      We may issue, either separately or together with other securities, shares of our common stock. Under our Restated Certificate of Incorporation, we are authorized to issue up to 210,000,000 shares of our common stock, $.01 par value. As of March 31, 2006, we had 48,213,677 shares of common stock issued and outstanding. Under our Restated Certificate of Incorporation, we also are authorized to issue up to 20,000,000 shares of Class B nonvoting convertible common stock, $.01 par value. As of March 31, 2006, we had no shares of Class B common stock outstanding.

      Voting Rights. Each holder of shares of common stock is entitled to one vote per share on all matters to be voted on by stockholders. Holders of common stock are not entitled to cumulative votes in the election of directors.

      Dividend Rights. The holders of common stock are entitled to dividends and other distributions if, as and when declared by our Board of Directors out of assets legally available therefore, subject to the rights of any holder of preferred stock, restrictions set forth in our credit facilities and restrictions, if any, imposed by other indebtedness outstanding from time to time. The holders of common stock and Class B common stock are entitled to equivalent per share dividends and distributions.

      Other Rights. Upon our liquidation, dissolution or winding up, the holders of shares of common stock would be entitled to share pro rata (on an equal basis with the holders of the Class B common stock) in the distribution of all of our assets remaining available for distribution after satisfaction of all its liabilities and the payment of the liquidation preference of any outstanding preferred stock. The holders of common stock have no preemptive or other subscription rights to purchase shares of our common stock, nor are they entitled to the benefits of any sinking fund provisions.

Class B Common Stock

      Our Class B common stock is identical to our common stock in all respects except that the holders of Class B common stock will have no right to vote, except as required by law. Shares of Class B common stock automatically convert into the same number of shares of common stock upon the sale or transfer by the holder thereof to a non-affiliate of ours. To the extent permitted by law, each holder of Class B common stock is entitled to convert any or all shares of Class B common stock held into the same number of shares of common stock at any time.

Preferred Stock

      We may elect to issue shares of our preferred stock, $.01 par value, from time to time in one or more series. Shares of our preferred stock may have dividend, redemption, voting and liquidation rights taking priority over our common stock and Class B common stock, and shares of preferred stock may be convertible into our common stock. The issuance of shares of preferred stock could decrease the amount of earnings and assets available for distribution to holders of shares of common stock and Class B common stock and could adversely affect the rights and powers, including voting rights, of holders of shares of common stock and Class B common stock. The existence of authorized and undesignated shares of preferred stock may also have an adverse effect on the market price of our common stock. In addition, the issuance of any shares of preferred stock could have the effect of delaying, deferring or preventing a change of control.

      Our Board of Directors is authorized, subject to any limitations prescribed by law, to provide for the issuance of shares of preferred stock in one or more series without any approval of our stockholders. Our Board of Directors determines the rights, qualifications, restrictions and limitations relating to each series of our preferred stock at the time of issuance, and such rights, qualifications, restrictions and limitations may differ with respect to those of shares of preferred stock of a different series. Our Restated Certificate of Incorporation authorizes our Board of Directors, without further stockholder action, to provide for the issuance of up to 20,000,000 shares of preferred stock, in one or more series. As of March 31, 2006, no shares of preferred stock were designated or were issued and outstanding. We may amend from time to time our Restated Certificate of Incorporation to increase the number of authorized shares of preferred stock.

      For a complete description of any series of preferred stock issued by us, you should refer to the applicable Certificate of Amendment to our Restated Certificate of Incorporation or the applicable certificate of designations, as the case may be, establishing a particular series of preferred stock, in either case which will be filed with the Secretary of State of the State of Delaware.

      The preferred stock will, when issued, be fully paid and nonassessable.

      Dividend Rights. The preferred stock will be preferred over our common stock and Class B common stock as to payment of dividends. Before any dividends or distributions (other than dividends or distributions payable in common stock) on our common stock will be declared and set apart for payment or paid, the holders of shares of each series of preferred stock will be entitled to receive dividends when, as and if declared by our Board of Directors. We will pay those dividends either in cash, shares of common stock or preferred stock or otherwise, at the rate and on the date or dates set forth in the applicable terms of the series of preferred stock. With respect to each series of preferred stock, the dividends on each share of the series will be cumulative from the date of issue of the share unless another date is set forth in the applicable terms of the series of preferred stock. Accruals of dividends will not bear interest.

      Rights Upon Liquidation. The preferred stock will be preferred over our common stock and Class B common stock as to assets so that the holders of each series of preferred stock will be entitled to be paid, upon our voluntary or involuntary liquidation, dissolution or winding up and before any distribution is made to the holders of common stock, the amount set forth in the applicable terms of the series of preferred stock. However, in this case the holders of preferred stock will not be entitled to any other or further payment. If upon any liquidation, dissolution or winding up our net assets are insufficient to permit the payment in full of the respective amounts to which the holders of all outstanding preferred stock are entitled, our entire remaining net assets will be distributed among the holders of each series of preferred stock in amounts proportional to the full amounts to which the holders of each series are entitled.

      Redemption. All shares of any series of preferred stock will be redeemable to the extent set forth in the applicable terms of the series of preferred stock. All shares of any series of preferred stock will be convertible into shares of our common stock or into shares of any other series of preferred stock to the extent set forth in the applicable terms of the series of preferred stock.

      Voting Rights. Except as indicated in the applicable terms of the series of preferred stock, the holders of preferred stock will be entitled to one vote for each share of preferred stock held by them on all matters properly presented to stockholders. The holders of common stock, Class B common stock and the holders of all series of preferred stock will vote together as one class.

Certain Provisions of Our Restated Certificate of Incorporation

      Our Restated Certificate of Incorporation provides for a classified Board of Directors in which directors are divided into three classes, each class being elected for a term of three years expiring at successive yearly intervals. In addition, our Restated Certificate of Incorporation requires a vote of a majority of the remaining Board of Directors to fill a vacancy on our Board of Directors and does not permit vacancies to be filled by a vote of our stockholders. Our Restated Certificate of Incorporation provides that vacancies filled by our Board of Directors will be filled for the remainder of the term of the class in which the vacancy occurs. Our

Restated Certificate of Incorporation further states that a decrease in the number of directors will not shorten the term of any incumbent.

Section 203 of the Delaware General Corporation Law

      We are a Delaware corporation subject to Section 203 of the DGCL. Section 203 provides in general that an interested stockholder acquiring more than 15% of the outstanding voting stock of a corporation subject to Section 203 but less than 85% of such stock may not engage in certain business combinations (as defined in Section 203) with the corporation for a period of three years subsequent to the date on which the stockholder became an interested stockholder unless:

      A “business combination” includes mergers, asset sales and other transactions resulting in financial benefit to a stockholder. Section 203 could prohibit or delay mergers or other takeover or change of control attempts with respect to us and, accordingly, may discourage attempts that might result in a premium over the market price for the shares held by stockholders.

Transfer Agent and Registrar

      The Transfer Agent and Registrar for our common stock is Mellon Investor Services LLC.

SELLING SECURITYHOLDERS

      The Debentures were originally issued by us in an offering exempt from the registration requirements of the Securities Act to initial purchasers who represented to us that they were qualified institutional buyers. Each initial purchaser and institution that purchased the Debentures from the initial purchaser and who has provided us with a completed questionnaire setting forth the information specified below, and that selling securityholder’s transferees, pledgees, donees and other successors which we refer to collectively as the “selling securityholders,” may from time to time offer and sell pursuant to this prospectus or any applicable prospectus supplement, any or all of the Debentures held by that selling securityholder, including the related guarantee, and common stock into which the Debentures are convertible.

      The following table sets forth, to our knowledge, information as of                     , 2006, with respect to the selling securityholders and the principal amounts of Debentures beneficially owned by each selling securityholder that may be offered under this prospectus. This information is based on information provided by or on behalf of the selling securityholders pursuant to the questionnaires referred to above. No holder of the Debentures may sell the Debentures, including the related guarantee, or shares of common stock without furnishing to us a questionnaire setting forth the information specified below. However, as of the date of this prospectus, not every holder has provided to us a questionnaire. Therefore, the heading “Other” in the “Name of Selling Securityholder” column below represents the Debentures and shares of common stock held by holders who have not yet returned to us their questionnaire.

      The selling securityholders may offer all, some or none of the Debentures or common stock into which the Debentures are convertible. In addition, the selling securityholders may have sold, transferred or otherwise disposed of all or a portion of their Debentures since the date on which they provided the information regarding their Debentures in transactions exempt from the registration requirements of the Securities Act. No selling securityholder beneficially owns one percent or more of the Debentures or of our common stock, assuming conversion of the selling securityholders’ Debentures, and no selling securityholder has had any material relationship with us or our affiliates within the past three years, except as otherwise indicated in the table below.

      Information concerning the selling securityholders may change from time to time and any changed information will be set forth in supplements to this prospectus if and when necessary. In addition, the conversion rate and, therefore, the number of shares of common stock issuable upon conversion of the Debentures, is subject to adjustment in the event of stock splits, stock dividends, reorganizations and similar events described in this prospectus.

PLAN OF DISTRIBUTION

      We will not receive any of the proceeds of the sale of the Debentures, including the related guarantee, and the common stock issuable upon conversion of the Debentures offered by this prospectus. The Debentures, including the related guarantee, and the underlying common stock may be sold from time to time to purchasers:

      The selling securityholders and any underwriters, broker-dealers or agents who participate in the distribution of the Debentures and the common stock issuable upon conversion of the Debentures may be deemed to be “underwriters” within the meaning of the Securities Act. As a result, any profits on the sale of the underlying common stock by the selling securityholders and any discounts, commissions or concessions received by any such broker-dealers or agents may be deemed to be underwriting discounts and commissions under the Securities Act. If the selling securityholders were deemed to be underwriters, the selling securityholders may be subject to liabilities including, but not limited to, those of Sections 11, 12 and 17 of the Securities Act and Rule 10b-5 under the Exchange Act.

      If the Debentures and the common stock issuable upon conversion of the Debentures are sold through underwriters or broker-dealers, the selling securityholders will be responsible for underwriting discounts or commissions or agent’s commissions.

      The Debentures and the common stock issuable upon conversion of the Debentures may be sold in one or more transactions at:

      These sales may be effected in transactions:

These transactions may include block transactions or crosses. Crosses are transactions in which the same broker acts as an agent on both sides of the transaction.

      In connection with the sales of the Debentures and the common stock issuable upon conversion of the Debentures or otherwise, the selling securityholders may enter into hedging transactions with broker-dealers. These broker-dealers may in turn engage in short sales of the Debentures and the underlying common stock in the course of hedging their positions. The selling securityholders may also sell the Debentures and the underlying common stock short and deliver the Debentures and the underlying common stock to close out

short positions, or loan or pledge Debentures and the underlying common stock to broker-dealers that, in turn, may sell the Debentures and the underlying common stock.

      To our knowledge, there are currently no plans, arrangements or understandings between any selling securityholders and any underwriter, broker-dealer or agent regarding the sale of the Debentures and the common stock issuable upon conversion of the Debentures by the selling securityholders. The selling securityholders may decide not to sell all or a portion of the Debentures and the underlying common stock offered by them pursuant to this prospectus or may decide not to sell Debentures or the underlying common stock under this prospectus. In addition, any selling securityholder may transfer, devise or give the Debentures and the underlying common stock by other means not described in this prospectus. Any Debentures or underlying common stock covered by this prospectus that qualify for sale pursuant to Rule 144 or Rule 144A of the Securities Act, or Regulation S under the Securities Act, may be sold under Rule 144 or Rule 144A or Regulation S rather than pursuant to this prospectus.

      Our common stock is traded is currently traded on the New York Stock Exchange under the ticker symbol “WCC.” We do not intend to apply for listing of the Debentures on any securities exchange or for inclusion of the Debentures in any automated quotation system. The Debentures originally issued in the private offering are eligible for trading on The PORTAL^sm Market of the National Association of Securities Dealers, Inc. However, Debentures sold pursuant to this prospectus will no longer be eligible for trading on The PORTAL^sm Market. Accordingly, no assurance can be given as to the development of liquidity or any trading market for the Debentures.

      The selling securityholders and any other persons participating in the distribution of the Debentures or the common stock issuable upon conversion of the Debentures will be subject to the Exchange Act. The Exchange Act rules include, without limitation, Regulation M, which may limit the timing of purchases and sales of any of the Debentures and the underlying common stock by the selling securityholders and any such other person. In addition, Regulation M of the Exchange Act may restrict the ability of any person engaged in the distribution of the Debentures and the underlying common stock to engage in market-making activities with respect to the particular Debentures and underlying common stock being distributed for a period of up to five business days prior to the commencement of such distribution. This may affect the marketability of the Debentures and the underlying common stock and the ability to engage in market-making activities with respect to the Debentures and the underlying common stock.

      Under the registration rights agreement entered into with the initial purchasers of the Debentures issued in the private offering, we agreed to, at our expense, use commercially reasonable efforts to keep the registration statement of which this prospectus is a part effective until the earliest of:

      We may suspend the holder’s use of the prospectus for a period not to exceed 45 days in any 90-day period, and not to exceed an aggregate of 90 days in any 360-day period, if

      However, if the disclosure relates to a previously undisclosed proposed or pending material business transaction, the disclosure of which would impede our ability to consummate such transaction, we may extend the suspension period from 45 days to 60 days. Each holder, by its acceptance of the Debentures, agrees to hold any communication by us in confidence.

      Under the registration rights agreement, we and the selling securityholders will each indemnify the other against certain liabilities, including certain liabilities under the Securities Act, or will be entitled to contribution in connection with these liabilities.

      We also agreed to pay liquidated damages to certain holders of the Debentures and the shares of common stock issuable upon conversion of the Debentures if the prospectus is unavailable for periods in excess of those permitted.

      We have agreed to pay substantially all of the expense incidental to the registration, offering and sale of the Convertible Debentures and the common stock issuable upon conversion of the Debentures to the public, other than commissions, fees and discounts of underwriters, brokers, dealers and agents.

LEGAL MATTERS

      The validity of the issuance of the Debentures, including the related guarantee, and the common stock issuable upon conversion of the Debentures will be passed upon for us by Kirkpatrick & Lockhart Nicholson Graham LLP, Pittsburgh, Pennsylvania.

EXPERTS

      The financial statements and management’s assessment of the effectiveness of internal control over financial reporting (which is included in Management’s Report on Internal Control over Financial Reporting) incorporated in this Prospectus by reference to the Annual Report on Form 10-K for the year ended December 31, 2005 have been so incorporated in reliance on the report (which contains an explanatory paragraph relating to management’s exclusion of Carlton-Bates Company and Fastec Industrial Corp. from its assessment of internal control over financial reporting as of December 31, 2005 because they were acquired by the Company in purchase business combinations during 2005) of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

      The valuation of intangible assets referred to in our Annual Report on Form 10-K for our fiscal year ended December 31, 2005, incorporated by reference in this prospectus, was conducted by American Appraisal Associates, Inc., an independent appraiser.

WHERE YOU CAN FIND MORE INFORMATION

      We file reports, proxy statements and other information with the SEC. These reports, proxy statements and other information that we file with the SEC can be read and copied at the SEC’s Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 to obtain further information on the operation of the Public Reference Room. The SEC maintains an Internet site that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC, including us. The SEC’s Internet address is www.sec.gov. In addition, our common stock, $.01 par value, is listed on the New York Stock Exchange under the ticker symbol “WCC,” and our reports and other information can be inspected at the offices of the NYSE, 20 Broad Street, New York, New York 10005. Our reports and other information also can be accessed at our Internet site. Our Internet address is www.wesco.com. The information on our Internet site is not a part of this prospectus.

INCORPORATION BY REFERENCE

      The SEC allows us to “incorporate by reference” information that we file with it. This means that we can disclose important information to you by referring you to other documents. Any information we incorporate in this manner is considered part of this prospectus except to the extent updated and superseded by information contained in this prospectus.

      We incorporate by reference the following documents that we have filed with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act:

      Statements contained in this prospectus as to the contents of any contract or other document referred to in this prospectus do not purport to be complete, and where reference is made to the particular provisions of that contract or other document, those references are qualified in all respects by reference to all of the

provisions contained in that contract or other document. Any statement contained in a document incorporated by reference, or deemed to be incorporated by reference, into this prospectus will be deemed to be modified or superseded for purposes of this prospectus to the extent that a statement contained herein modifies or supersedes that statement. Any such statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute a part of this prospectus.

      We will provide without charge, upon written or oral request, a copy of any or all of the documents that are incorporated by reference into this prospectus and a copy of any or all other contracts or documents which are referred to in this prospectus. Requests should be directed to: WESCO International, Inc., Attention: Corporate Secretary, 225 West Station Square Drive, Suite 700, Pittsburgh, Pennsylvania 15219, telephone number: (412) 454-2200. You also may review a copy of the registration statement and its exhibits at the SEC’s Public Reference Room in Washington, D.C., as well as through the SEC’s Internet site and our Internet site.

PART II

INFORMATION NOT REQUIRED IN DOCUMENT

      The following table sets forth the costs and expenses payable by the registrant in connection with the sale of the Debentures and shares of common stock being registered. All amounts are estimates except for the SEC registration fee:

      Section 102(b)(7) of the Delaware General Corporation Law (the “DGCL”) permits a corporation, in its certificate of incorporation, to limit or eliminate, subject to certain statutory limitations, the liability of directors to the corporation or its stockholders for monetary damages for breaches of fiduciary duty, except for liability (a) for any breach of the director’s duty of loyalty to the corporation or its stockholders, (b) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (c) under Section 174 of the DGCL or (d) for any transaction from which the director derived an improper personal benefit. Our restated certificate of incorporation provides, among other things, that the personal liability of our directors is so eliminated.

      Under Section 145 of the DGCL, a corporation has the power to indemnify directors and officers under certain prescribed circumstances and subject to certain limitations against certain costs and expenses, including attorneys’ fees actually and reasonably incurred in connection with any action, suit or proceeding, whether civil, criminal, administrative or investigative, to which any of them is a party by reason of his being a director or officer of the corporation if it is determined that he acted in accordance with the applicable standard of conduct set forth in such statutory provision.

      The By-laws of WESCO International, Inc. and WESCO Distribution, Inc. each provide that it will indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative, by reason of the fact that the person is or was or has agreed to become a director or officer of WESCO International, Inc. or WESCO Distribution, Inc., as the case may be, or is or was serving or has agreed to serve at the request of WESCO International, Inc. or WESCO Distribution, Inc., as the case may be, as a director or officer, of another corporation, partnership, joint venture, trust or other enterprise, or by reason of any action alleged to have been taken or omitted in such capacity. WESCO International and WESCO Distribution each may indemnify any person who was or is a party or is threatened to be made a party to such an action, suit or proceeding by reason of the fact that the person is or was or has agreed to become an employee or agent of WESCO International, Inc. or WESCO Distribution, as the case may be, or is or serving or has agreed to serve at the request of WESCO International, Inc. or WESCO Distribution, Inc., as the case may be, as an employee or agent of another corporation, partnership, joint venture, trust or other enterprise, against expenses (including attorneys’ fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by him or on his behalf in connection with such action, suit, or proceeding and any appeal therefrom, if the person acted in good faith and in a manner the person reasonably believed to be in or not opposed to the best interests of WESCO International, Inc. or WESCO Distribution, Inc., as the case may be, and, with respect to any criminal action or proceeding, had no reasonable cause to believe the person’s conduct was unlawful; except that in the case of an action or suit by or in the right of WESCO International, Inc. or WESCO Distribution, Inc., as the case may be, to procure a judgment in its favor (1) such indemnification will be

limited to expenses (including attorneys’ fees) actually and reasonably incurred by such person in the defense or settlement of such action or suit, and (2) no indemnification will be made in respect of any claim, issue or matter as to which such person will have been adjudged to be liable to WESCO International, Inc. or WESCO Distribution, as the case may be, unless and only to the extent that the Delaware Court of Chancery or the court in which such action or suit was brought determines upon application that, despite the adjudication of liability but in view of all the circumstances of the case, such person is fairly and reasonably entitled to indemnity for such expenses which the Delaware Court of Chancery or such other court deems proper.

      WESCO International, Inc. and WESCO Distribution each are also authorized to purchase and maintain insurance on behalf of any person who is or was or has agreed to become a director or officer, or is or was serving at its request as a director or officer of any other corporation, partnership, joint venture, trust or other enterprise against any liability asserted against such person and incurred by such person in any such capacity or arising out of such person’s status as such, whether or not WESCO International, Inc. or WESCO Distribution, Inc., as the case may be, would have the power to indemnify such person against such liability under the DGCL, provided that such insurance is available on acceptable terms, which determination will be made by a vote of a majority of the entire Board of Directors of WESCO International, Inc. or WESCO Distribution, Inc., as the case may be.

      In the past three years, the registrants have issued unregistered securities in connection with the following transactions:

      (a) Exhibits. The following exhibits are filed as part of this Registration Statement:

      The registrants hereby agree to furnish supplementally to the SEC, upon request, a copy of any omitted schedule to any of the agreements contained herein.

      (b) Financial Statement Schedules. Schedules are omitted because the information required to be submitted has been included in the Consolidated Financial Statements of WESCO International, Inc., or the required information is not applicable.

      The undersigned registrants hereby undertake:

      Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrants, the registrants have been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrants in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, each registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, the Registrants have duly caused this Registration Statement to be signed on their behalf by the undersigned, thereunto duly authorized, in the City of Pittsburgh, Commonwealth of Pennsylvania, on April 20, 2006.

POWER OF ATTORNEY

      Each of the undersigned directors and officers of WESCO International, Inc., a Delaware corporation, and WESCO Distribution, Inc., a Delaware corporation, do hereby constitute and appoint Roy W. Haley and Stephen A. Van Oss, or either of them, the undersigned’s true and lawful attorneys and agents, with full power of substitution and resubstitution in each, to do any and all acts and things in our name and on our behalf in our respective capacities as directors and officers and to execute any and all instruments for us and in our names in the capacities indicated below, which said attorneys and agents, or either one of them, may deem necessary or advisable to enable said corporation to comply with the Securities Act, as amended, and any rules, regulations and requirements of the Securities and Exchange Commission, in connection with this registration statement, including specifically, but without limitation, power and authority to sign for us or any of us in our names in the capacities indicated below, any and all amendments (including post-effective amendments, whether pursuant to Rule 462(b) or otherwise) hereto, and each of the undersigned does hereby ratify and confirm all that said attorneys and agents, or either one of them or any substitute, shall do or cause to be done by virtue hereof. This Power of Attorney may be executed in any number of counterparts.

      Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.

EXHIBIT INDEX

      The registrants hereby agree to furnish supplementally to the SEC, upon request, a copy of any omitted schedule to any of the agreements contained herein.