UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 11-K

(Mark One)

þ

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

for the fiscal year ended December 29, 2005 or

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

for the transition period from                      to                     

COMMISSION FILE NUMBER 1-14989

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

WESCO DISTRIBUTION, INC. RETIREMENT SAVINGS PLAN

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

WESCO INTERNATIONAL, Inc.
225 West Station Square Drive
Suite 700
Pittsburgh, Pennsylvania 15219-1122

 

 

WESCO Distribution, Inc.
Retirement Savings Plan
Financial Statements
December 29, 2005 and 2004

WESCO Distribution, Inc.
Retirement Savings Plan
Index
December 29, 2005 and 2004

		Page(s)
Report of Independent Registered Public Accounting Firm			1
Financial Statements
Statements of Net Assets Available for Benefits			2
Statement of Changes in Net Assets Available for Benefits			3
Notes to Financial Statements			4–9
Supplemental Schedule
Schedule H, line 4(i) — Schedule of Assets (Held at End of Year)			10–14
EX-23.1

Report of Independent Registered Public Accounting Firm

To the Investment and Administrative Committees of
WESCO Distribution, Inc. Retirement Savings Plan

In our opinion, the accompanying statements of net assets available for benefits and the related statement of changes in net assets available for benefits present fairly, in all material respects, the net assets available for benefits of the WESCO Distribution, Inc. Retirement Savings Plan (the “Plan”) at December 29, 2005 and 2004, and the changes in net assets available for benefits for the fiscal year ended December 29, 2005 in conformity with accounting principles generally accepted in the United States of America. These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

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

Pittsburgh, Pennsylvania
June 27, 2006

WESCO Distribution, Inc.
Retirement Savings Plan

Statements of Net Assets Available for Benefits

December 29, 2005 and 2004

		2005				2004
Investments (Notes 2 and 6)		$	279,738,374			$	258,137,520
Receivables
Employee contributions			25,706				5,156
Employer matching contributions			9,904				2,185
Employer profit sharing discretionary contribution			9,127,876				8,354,151
Accrued interest			13,645				12,921
Net assets available for benefits		$	288,915,505			$	266,511,933

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

WESCO Distribution, Inc.
Retirement Savings Plan

Statement of Changes in Net Assets Available for Benefits

Fiscal Year Ended December 29, 2005

		2005
Additions
Employee contributions		$	14,838,869
Employee rollovers			1,579,497
Employer contributions			13,825,450
Net appreciation from registered investment companies			8,384,995
Net appreciation from common/collective trust funds			4,353,257
Net appreciation from stock funds and self-directed accounts			4,040,595
Interest and dividend income			785,778
Total additions			47,808,441
Deductions
Distributions to withdrawing participants			25,404,869
Total deductions			25,404,869
Net increase			22,403,572
Net assets available for benefits
Beginning of year			266,511,933
End of year		$	288,915,505

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

WESCO Distribution, Inc.
Retirement Savings Plan

Notes to Financial Statements

December 29, 2005 and 2004

1.		Major Features of the Plan
		WESCO Distribution, Inc. Retirement Savings Plan (the “Plan”) was established as of February 28, 1994 (date of inception). At the date of inception, certain employees of the predecessor company became employees of WESCO Distribution, Inc. (the “Company”) and participants in the Plan. At the date of inception, all funds held by the prior plans related to the transferred employees were transferred to the Plan.
		The Plan covers the current employees of the Company and those former employees with a fund balance of at least $5,000 who elected to maintain their funds in the Plan. Former employees cannot make contributions to the Plan.
		The Plan is subject to the Employee Retirement Income Security Act of 1974 (“ERISA”). Participants may elect to make Tax Deferred Contributions ranging from 1% up to the lesser of 50% of their compensation or $14,000. Participants may elect to make After-Tax Contributions ranging from 1% up to the lesser of 50% of their compensation or $14,000. The $14,000 limits may be adjusted in future years by the Internal Revenue Service (“IRS”). The sum of the Tax Deferred Contributions and the After-Tax Contributions cannot exceed 15% of the participant’s compensation. Subject to limitation, the Company will make Matching Contributions in an amount equal to 50% of a participant’s total monthly contributions up to a maximum of 6% of their compensation. Participants who have attained age 50 before the close of the plan year are eligible to make catch-up contributions in addition to pre-tax contributions. A catch-up contribution is a pre-tax contribution that exceeds the annual deferral limit ($14,000 in 2005). A participant’s total catch-up contributions during 2005 cannot exceed $4,000. The catch up contribution limits are determined by the IRS and increases to $5,000 in 2006 and then indexed for inflation after 2006. In addition, the Company may, at the Board of Directors’ discretion, make a Discretionary Contribution to the Plan provided certain predetermined profit levels are attained. The Company made Discretionary Contributions of $9,127,876 and $8,354,151 for the fiscal years ended December 29, 2005 and 2004, respectively.
		Participants are fully vested in the value of their contributions and related investment income at all times and vest in their allocated share of employer contributions according to the following schedule:

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

		In conjunction with a leveraged recapitalization of the Company all active employees as of June 5, 1998 became fully vested.
		Employer contributions forfeited by participants not vested at their termination date are used to reinstate previously forfeited account balances of former participants who have returned to employment with the Company, or to reduce employer contributions in accordance with the plan document. Total forfeitures that reduced employer contributions in 2005 were approximately $508,000 and as of December 29, 2005, a balance of approximately $910,000 was available to reduce employer contributions in 2006.
		Sixteen options were available for investment of contributions to the Plan as of December 29, 2005. A brief description of the investment options is as follows:

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2005 and 2004

Fund		Description
AMCAP Fund		Fund that seeks long-term growth of capital by investing in growing, profitable companies.
American Balanced Fund		Investments balanced between income from bond investments and capital growth from equity investments.
American Century Value Fund		Long-term investments of established companies that pay dividends that may be less volatile that the stock market as a whole.
Columbia Acorn Fund		Fund seeks long-term growth of capital by investing primarily in common stocks of small and medium sized companies with capitalization of less than $5 billion.
Columbia Core Bond Fund		A bond fund investing at least 65% of its assets in U.S. Government debt securities, investment grade bonds, and cash and cash equivalents.
MFS Value Fund		A traditional value fund investing in high-quality companies with larger market capitalizations and low price-to-earnings ratios or high dividend yields.
Pro-Mix Conservative Term      Collective Investment Trust Fund		This fund invests in a conservative mix of stocks, bonds and cash securities focusing on fixed income securities with short to intermediate term maturities.
Pro-Mix Extended Term      Collective Investment Trust Fund		This fund invests in a growth-oriented mix of stocks, bonds and cash securities and long-term, fixed securities.
Pro-Mix Maximum Term      Collective Investment Trust Fund		This fund invests in an aggressive, growth-oriented mix of stocks, bonds and cash securities.
Pro-Mix Moderate Term      Collective Investment Trust Fund		This fund invests in a moderately conservative mix of stocks, bonds and cash securities that are intermediate to long-term fixed income securities and various stocks.

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2005 and 2004

Fund		Description
RiverSource Trust Equity Index      Fund I		Fund goal to achieve a rate of return as close as possible to the return of the S&P 500 Index by investing primarily in some or all of the securities of the S&P Index.
RiverSource Trust Midcap      Growth Fund II		Fund goal to provide long-term growth of capital by investing in primarily high-quality, mid-sized U.S. stocks with significant growth potential.
RiverSource Trust Stable      Capital Fund II		Fund goal to preserve principal and income by investing primarily in bonds backed by the U.S. Government.
Self-Directed Brokerage      Account		Account that provides participants access to a wide range of common stocks and mutual funds beyond those available through the Plan.
Templeton Foreign Fund		Funds seeks long-term capital growth by investing primarily in equity securities of companies outside the U.S.
WESCO International Stock      Fund		Fund that invests in the stock of WESCO International, Inc.

		As of December 29, 2005, the Viacom Pooled Stock Fund and the Blockbuster, Inc. Pooled Stock Fund (“Funds”) were removed from the available list of investment options. Participants in these Funds were provided the option to invest their account balance in the remaining investment options provided by the Plan.
		An account is maintained for each participant, which is credited with the participant’s contributions and an allocation of Company contributions and plan earnings. Allocations are based on participant contributions or account balances, as defined by the Plan. The benefit to which a participant is entitled is the benefit that can be provided from that participant’s account.
		The Investment Committee and the Administrative Committee of the Company’s Board of Directors administer the Plan. Reference should be made to the Prospectus, “What Does Your Future Hold?” for additional information on the Plan.
2.		Summary of Significant Accounting Policies
		Accounting Principles
		The financial statements of the Plan have been prepared in accordance with accounting principles generally accepted in the United States of America. The following are the significant accounting policies followed by the Plan:

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2005 and 2004

		Basis of Accounting
		The accounting records of the Plan are maintained on the accrual basis of accounting.
		Investment Valuation and Income Recognition
		Investments are carried at fair value in the accompanying financial statements. Investments in registered investment companies, common/collective trust funds and common stocks are valued by the trustee based on market values of all assets in the funds’ securities portfolio and the number of units in the funds owned by the Plan. Investments in the WESCO International Stock Fund are valued at quoted market prices. Participant loans are valued at cost, which approximates fair value.
		Purchases and sales of securities are recorded on a settlement date basis. Dividends are recorded on the ex-dividend date.
		Net Appreciation (Depreciation) in Value of Investments
		The Plan presents in the statement of changes in net assets available for benefits the net appreciation (depreciation) in the fair value of its investments, which consists of the realized gains (losses) and the unrealized appreciation (depreciation) in common/collective trusts, registered investment companies, Viacom and WESCO International stock and other common stocks.
		Use of Estimates
		The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make significant estimates and assumptions. These may affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of additions and deductions during the reporting period. Actual results could differ from those estimates.
		Risks and Uncertainties
		The Plan provides for various investment options in any combination of stocks, bonds, fixed income securities and other investment securities. Investment securities are exposed to various risks, such as interest rate, market and credit. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, it is at least reasonably possible that changes in the near-term could materially affect participants’ account balances and the amounts reported in the statements of net assets available for benefits and the statement of changes in net assets available for benefits.
		Other
		Administrative expenses, excluding participant loan setup fees, distribution fees and hardship withdrawal fees, are paid by the Company and, therefore, are not expenses of the Plan.
		Benefits are recorded when paid.
3.		Tax Status
		The Internal Revenue Service has determined and informed the Company by a letter dated October 15, 2003, that the Plan is designed in accordance with Section 401(a) of the Internal Revenue Code (“IRC”) and, therefore, is exempt from federal taxes under provisions of Section 501(a). Accordingly, no provision for income taxes has been included in the Plan’s financial statements. The Plan has been amended since reviewing the determination letter. However, the Plan administrator and the Plan’s tax counsel believe that the Plan is designed and is currently being operated in compliance with the applicable requirements of the IRC.

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2005 and 2004

4.		Employee Loans
		Participants are permitted to borrow against a portion of their vested account balance within the prescribed limitations and pursuant to nondiscriminatory rules established by the Administrative Committee. Each loan is to be repaid over a period not to exceed five years.
		The interest rate applied to employee loans is established each month by the Administrative Committee at 1% above the PNC Bank prime interest rate. The interest rate on new loans ranged between 5.0% and 8.0% for the fiscal year ended December 29, 2005. Principal and interest payments are generally made through monthly payroll deductions and are credited to the participant’s individual account. Loans of approximately $2,521,000 were made from the Plan and loan principal repayments of approximately $2,314,000 were received by the Plan for the year ended December 29, 2005. Interest of approximately $306,000 was received by the Plan for the year ended December 29, 2005 related to employee loans.
5.		Plan Termination
		Although the Company has not expressed any intent to do so, it has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions of ERISA. In the event the Plan terminates, participants will become 100% vested in their accounts, and all vested assets shall be distributed to such participants in accordance with the terms of the Plan, or in such other manner, not inconsistent with the requirements of any applicable law or regulation, as the Company may in its sole discretion determine.

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2005 and 2004

6.		Investments
		Investments representing 5% or more of the net assets available for benefits as of December 29, 2005 and 2004 were as follows:

		2005				2004
AMCAP Fund		$	36,550,606			$	*
American Balanced Fund			31,417,575				30,588,760
American Century Value Fund			18,553,434				15,970,409
American Express Trust Equity Index Fund I			**				30,704,775
RiverSource Equity Index Fund I			31,012,651				**
American Express Trust Stable Capital Fund II			**				59,467,399
RiverSource Stable Capital Fund II			63,796,144				**
AXP New Dimension Fund			*				42,404,868
Columbia Acorn Fund			30,581,112				25,260,130
Templeton Foreign Fund			15,397,100				*

7.		Related Party Transactions
		Certain investments of the Plan are mutual funds managed by American Express. The trustee of the Plan is American Express Trust Company. Participants of the Plan may also elect to invest in WESCO International, Inc. common stock within the WESCO Pooled Stock Fund. WESCO International, Inc. owns 100% of the Company. Therefore, these transactions qualify as party-in-interest transactions.

WESCO Distribution, Inc.
Retirement Savings Plan

Schedule of Assets (Held at End of Year)

EIN 25-1723345, Plan Number 001
December 29, 2005                                                                                                                                                                Schedule H, line 4i

(a)		(b)		(c)		(d)				(e)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,						Current
		Similar Party		Par, or Maturity Value		Cost				Value
		AMCAP Fund		AMCAP Fund (Class R-4)		$	—			$	36,550,606
*		RiverSource Trust		Midcap Growth Fund II			—				3,599,417
*		RiverSource Trust		Stable Capital Fund II			—				63,796,144
*		RiverSource Trust		Equity Index Fund I			—				31,012,651
		American Funds		American Balanced Fund (Class A)			—				31,417,575
		American Century Investments		American Century Value Fund			—				18,567,379
		Columbia Mutual Funds		Columbia Acorn Fund (Class A)			—				30,581,112
		Columbia Mutual Funds		Columbia Core Bond Fund (A)			—				7,526,521
		MFS Family of Funds		MFS Value Fund (Class A)			—				7,626,565
		Participant Promissory Notes		5.0%-10.5% due at various dates			—				5,379,639
		Pro-Mix Funds		Pro-Mix Max Term Investment Trust			—				3,433,426
		Pro-Mix Funds		Pro-Mix Extended Term Investment Trust			—				2,795,875
		Pro-Mix Funds		Pro-Mix Moderate Term Investment Trust			—				1,557,138
		Pro-Mix Funds		Pro-Mix Conservative Term Inv. Trust			—				722,837
		Templeton Funds		Templeton Foreign Fund (A)			—				15,397,100
*		WESCO International, Inc.		WESCO International Pooled Stock Fund			—				12,711,250
		Align Technology, Inc.		Common Stock			—				1,280
		Altria Group Inc.		Common Stock			—				3,755
		American Ammunition Inc.		Common Stock			—				5
		American Century Investments		American Century Equity Income Fund			—				13,556
		American Eagle Outfitters Inc.		Common Stock			—				13,872
		American Oil & Gas Inc.		Common Stock			—				14,985
		Ametek Inc.		Common Stock			—				4,295
		Applied Materials		Common Stock			—				1,806
		APW Ltd		Common Stock			—				1
		Aquila Inc.		Common Stock			—				19,345
		Arcadia Resources, Inc.		Common Stock			—				312,180
		Artemis International Sol		Common Stock			—				39
		Artisan Mid Cap Value Fund		Common Stock			—				69,884
		AT&T Inc.		Common Stock			—				4,924
		Avalonbay Communities Inc.		Common Stock			—				17,880
		Berkshire Hathaway Inc.		Common Stock			—				8,847
		Biotime Inc.		Common Stock			—				31
		Blockbuster Inc.		Common Stock			—				3,482
		Boeing Co.		Common Stock			—				7,118
		Brandywine Funds		Income Fund			—				34,654
		Budget Group Inc.		Common Stock			—				13
		BY Prudhoe Bay Royalty Trust		Common Stock			—				2,658
		Calpine Corp.		Common Stock			—				1,363

WESCO Distribution, Inc.
Retirement Savings Plan
Schedule of Assets (Held at End of Year)
EIN 25-1723345, Plan Number 001
December 29, 2005                                                                                                                                                                Schedule H, line 4i

(a)		(b)		(c)		(d)				(e)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,						Current
		Similar Party		Par, or Maturity Value		Cost				Value
		Candela Corp.		Common Stock			—				8,970
		Charys Holding Co.		Common Stock			—				23,063
		Chesapeake Energy		Common Stock			—				25,474
		Chevron Corp.		Common Stock			—				5,647
		Chicos FAS Inc.		Common Stock			—				11,120
		Chilmark Entertainment Group		Common Stock			—				46
		Cisco Systems		Common Stock			—				3,448
		CTS Corp.		Common Stock			—				1,117
		DCH Technology		Common Stock			—				4
		Del Global Technologies Corp.		Common Stock			—				348
		Dodge & Cox Funds		Balanced Fund			—				14,048
		Dodge & Cox Funds		Stock Fund			—				14,660
		Duke Realty Corporation		Common Stock			—				3,386
		Eagle Broadband Inc.		Common Stock			—				3,375
		Earthshell Corp.		Common Stock			—				253
		Encana Corp.		Common Stock			—				13,461
		Excelsior Funds		Value & Restructuring Fund			—				11,644
		Federal Mogul Corp.		Common Stock			—				2,286
		Focus Enhancements		Common Stock			—				63
		Fording Canadian Coat Trust		Common Stock			—				3,525
		Gabelli Funds		Asset Fund			—				7,027
		Gamco Gold AAA		Gold Fund			—				17,492
		Genentech Inc.		Common Stock			—				27,618
		General Electric		Common Stock			—				16,891
		General Motors		Common Stock			—				1,711
		Genesis Microchip, Inc.		Common Stock			—				13,800
		Google Inc.		Common Stock			—				6,302
		Harbor Funds		Harbor Bond Fund			—				6,068
		Harbor Funds		Harbor International Fund			—				20,843
		Heartland Funds		Heartland Value Fund			—				11,795
		Icon Funds		Icon Information Technology Fund			—				4,857
		I Shares		MSCI Emerging Markets Index			—				63,929
		I Shares		S&P Trust Fund			—				111,221
		I Shares		DJ Select Dividend Index Fund			—				4,927
		I Shares		DJ U.S. Consumer Cycl SEC Fund			—				2,994
		I Shares		Goldman Sachs Nat Res Ind Fund			—				47,355
		I Shares		MSCI Australia Index Fund			—				23,983
		I Shares		MSCI Canada Inces Fund			—				15,386
		I Shares		MSCI Pacific Ex Japan Ind Fund			—				26,008

WESCO Distribution, Inc.
Retirement Savings Plan
Schedule of Assets (Held at End of Year)
EIN 25-1723345, Plan Number 001
December 29, 2005                                                                                                                                                                 Schedule H, line 4i

(a)		(b)		(c)		(d)				(e)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,						Current
		Similar Party		Par, or Maturity Value		Cost				Value
		I Shares		MSCI South Korea Index Fund			—				22,874
		I Shares		MSCI Taiwan Index Fund			—				10,016
		I Shares		S&P Europe 350 Index Fund			—				8,933
		I Shares		S&P Latin America 40			—				6,160
		Intel Corp.		Common Stock			—				7,521
		Interplay Entertainment		Common Stock			—				8
		Invio Biomedical Corp.		Common Stock			—				3,270
		Ivanhoe Energy, Inc.		Common Stock			—				107
		Janus Funds		High Yield Fund			—				20,951
		Janus Funds		Mid Cap Value Fund			—				41,759
		JDS Uniphase Corp.		Common Stock			—				5,543
		Johnson & Johnson		Common Stock			—				5,001
		Johnson Controls		Common Stock			—				1,831
		K.C.S. Energy Inc.		Common Stock			—				2,439
		Kaire Holdings Inc.		Common Stock			—				15
		Keryx Biopharmaceuticals		Common Stock			—				2,850
		Kinetics Paradigm Fund		Common Stock			—				19,905
		Liberty Property Trust		Common Stock			—				8,520
		Loomis Sayles Global Bond Fund		Common Stock			—				5,731
		Lucent Technology		Common Stock			—				810
		Manhattan Pharmaceuticals		Common Stock			—				3,861
		Marathon Oil Corp.		Common Stock			—				3,035
		Matrix Advisors Value		Common Stock			—				40,363
		Merck & Co.		Common Stock			—				3,882
		Meridian Funds		Meridian Growth Fund			—				18,901
		Meridian Funds		Meridian Value Funds			—				7,052
		MGRS Fremont Micro Cap MGRS Fd		Common Stock			—				8,415
		Mobile Reach International, Inc.		Common Stock			—				5
		Nastech Pharmaceutical Co.		Common Stock			—				3,000
		National Health Investors, Inc.		Common Stock			—				10,480
		Neomedia Technologies		Common Stock			—				1,120
		Newcastle Investment Corp.		Common Stock			—				4,700
		Netflix.com Inc.		Common Stock			—
		Nokia Corp.		Common Stock			—				5,544
		Nortel Networks Corp. New		Common Stock			—				488
		Northern		High Yield Fixed Income Fund			—				20,778
		Oakmark Funds		Oakmark Equity and Income Fund (I)			—				33,259
		Oakmark Funds		Oakmark Fund			—				11,891
		Occidental Petroleum		Common Stock			—				3,988

WESCO Distribution, Inc.
Retirement Savings Plan
Schedule of Assets (Held at End of Year)
EIN 25-1723345, Plan Number 001
December 29, 2005                                                                                                                                                                 Schedule H, line 4i

(a)		(b)		(c)		(d)				(e)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,						Current
		Similar Party		Par, or Maturity Value		Cost				Value
		Oracle Systems		Common Stock			—				3,687
		Patterson-UTI Energy Inc.		Common Stock			—				3,284
		Paychex Inc.		Common Stock			—				5,822
		Photoworks, Inc.		Common Stock			—				16
		PIMCO Funds		PIMCO PEA Renaissance Fund			—				9,172
		PIMCO Funds		PIMCO Total Return Fund			—				5,971
		Pioneer Natural Resources		Common Stock			—				2,806
		PNC Financial Services Group		Common Stock			—				1,744
		Profunds		Profund Ultrasmall Cap Profund I			—				39,240
		Profunds		Profunds Ultra Mid-Cap Profund			—				78,866
		Purchase Pro.com		Common Stock			—				1
		Qualcomm Inc.		Common Stock			—				10,885
		Quicksilver Resources Inc.		Common Stock			—				18,806
		Radioshack Corporation		Common Stock			—				3,696
		Ralcorp Holdings Inc.		Common Stock			—				2,014
		Real Networks Inc.		Common Stock			—				1,582
		Reliant Energy, Inc.		Common Stock			—				30,780
		Renovo Holdings, Inc.		Common Stock			—				10
		RiverSource Trust		Money Market Fund II			—				405,711
		Royce Total Return Fund		Common Stock			—				6,049
		RS Partners Fund		Common Stock			—				52,956
		RSA SEC Inc.		Common Stock			—				1,133
		RVS		European Equity Fund (Class Y)			—				10,615
		Schering-Plough		Common Stock			—				7,385
		Shaw Group Inc.		Common Stock			—				2,934
		Silver Star Energy		Common Stock			—				575
		Sirius Satellite Radio Inc.		Common Stock			—				9,193
		Solomon Alliance Group		Common Stock			—				1
		Sonus Networks		Common Stock			—				3,810
		Sound Shore Fund		Common Stock			—				5,935
		Southwest Airlines		Common Stock			—				711
		Spectrum Signal Processing		Common Stock			—				107
		Sun Microsystems		Common Stock			—				1,700
		T. Rowe Price Funds		Capital Appreciation Fund			—				9,099
		T. Rowe Price Funds		Growth Stock Fund			—				73,280
		Tellabs		Common Stock			—				3,164
		The India Fund Inc.		Mutual Fund			—				10,400
		The Muhlenkamp Fund		Mutual Fund			—				9,752
		The Reserve Funds		Primary Fund Class A			—				595,219

WESCO Distribution, Inc.
Retirement Savings Plan
Schedule of Assets (Held at End of Year)
EIN 25-1723345, Plan Number 001
December 29, 2005                                                                                                                                                                 Schedule H, line 4i

(a)		(b)		(c)		(d)				(e)
				Description of Investment
		Identity of Issue,		Including Maturity Date,
		Borrower, Lessor or		Rate of Interest, Collateral,						Current
		Similar Party		Par, or Maturity Value		Cost				Value
		The Yacktman Fund		Mutual Fund			—				2,946
		Third Avenue		International Value Fund			—				12,801
		Third Avenue		Real Estate Value Fund			—				5,266
		Thompson Plumb and Associates		Growth Fund			—				4,999
		Time Warner Inc.		Common Stock			—				3,583
		Top Tankers Inc.		Common Stock			—				1,240
		Tyco International Ltd.		Common Stock			—				1,445
		Ultra Petroleum Corp.		Common Stock			—				137,250
		UMB Scout		Worldwide Fund			—				66,346
		Unigene Labs Inc.		Common Stock			—				17,958
		USAir Group		Common Stock			—				1
		Utilities Select Sector SPDR Fund		Common Stock			—				10,099
		UTS Energy Corp.		Common Stock			—				3,625
		Valeant Pharmaceuticals Intl.		Common Stock			—				1,795
		Vanguard Funds		GNMA Portfolio Fund			—				4,300
		Vanguard Funds		Wellesley Income Fund			—				75,474
		Vanguard Funds		Windsor II Fund			—				50,642
		Viacom Inc. Class B		Common Stock			—				3,361,655
		Vioquest Pharmaceuticals		Common Stock			—				41
		Weingarten Realty Investors SBI		Common Stock			—				17,195
		Wells Fargo		Asia Pacific Investment Advisors			—				385,096
		XM Satellite Radio		Common Stock			—				4,152
						$	—			$	279,738,374

EXHIBITS

     The following exhibit is filed or incorporated as part of this report:

Exhibit
Number		Description
23.01		Consent of PricewaterhouseCoopers LLP (filed herewith)

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employees benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.

				WESCO Distribution, Inc.
				Retirement Savings Plan
Date: June 27, 2006				/s/ Stephen A. Van Oss
				Stephen A. Van Oss
				Chairman, 401K Retirement Savings Plan
				Investment and Administrative Committees