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Table of Contents

 
 
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, 2009
     
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
Index
         
    Page(s)
    1  
 
       
Financial Statements
       
 
       
    2  
 
       
    3  
 
       
    4-12  
 
       
Supplemental Schedule
       
 
       
    13-42  
 
       
    43  
 EX-23.1

 


Table of Contents

Report of Independent Registered Public Accounting Firm
To the Participants and Administrator of the
WESCO Distribution, Inc. Retirement Savings Plan

Pittsburgh, Pennsylvania
     We have audited the accompanying statements of net assets available for benefits of the WESCO Distribution, Inc. Retirement Savings Plan (the Plan) as of December 29, 2009 and 2008, and the related statements of changes in net assets available for benefits for the years then ended. These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits.
     We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States of America). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.
     In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for benefits of the WESCO Distribution, Inc. Retirement Savings Plan as of December 29, 2009 and 2008, and the changes in net assets available for benefits for the years then ended, in conformity with accounting principles generally accepted in the United States of America.
     Our audits were performed for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental schedule of assets (held at end of year) is presented for the purpose of additional analysis and is not a required part of the basic financial statements but is supplementary information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. This supplemental schedule is the responsibility of the Plan’s management. The supplemental schedule has been subjected to the auditing procedures applied in the audit of the basic financial statements and, in our opinion, is fairly stated in all material respects in relation to the basic financial statements taken as a whole.
/s/ Alpern Rosenthal
Pittsburgh, Pennsylvania
June 28, 2010

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Table of Contents

WESCO Distribution, Inc.
Retirement Savings Plan
Statements of Net Assets Available for Benefits
December 29, 2009 and 2008
                 
    2009     2008  
Investments at fair value (Notes 2, 4, 5, and 7)
               
Shares of registered investment companies
  $ 177,568,193     $ 124,263,627  
Common collective trusts
    20,074,381       14,054,450  
Stock funds and self-directed accounts
    15,724,184       11,463,975  
Stable Value Fund
    109,219,294       105,930,357  
RAFI Enhanced Large Company Fund
    20,946,580       17,744,056  
Participant loans
    9,154,053       7,280,126  
 
           
 
    352,686,685       280,736,591  
 
               
Receivables
               
Employee contributions
    746,094       876,896  
Employer matching contributions
          347,561  
Employer discretionary contribution
          8,803,031  
Accrued interest
    20,496       21,807  
 
           
Net assets available for benefits at fair value
    353,453,275       290,785,886  
 
               
Adjustment from fair value to contract value for interest in the Stable Value Fund relating to fully benefit-responsive contracts (Note 7)
    (4,410,440 )     (2,617,033 )
 
           
Net assets available for benefits
  $ 349,042,835     $ 288,168,853  
 
           
The accompanying notes are an integral part of these financial statements.

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Table of Contents

WESCO Distribution, Inc.
Retirement Savings Plan
Statements of Changes in Net Assets Available for Benefits
Fiscal Years Ended December 29, 2009 and 2008
                 
    2009     2008  
Additions
               
Employee contributions
  $ 20,913,407     $ 24,682,279  
Employee rollovers
    1,169,935       1,026,878  
Employer contributions (including discretionary contributions)
    4,022,410       16,821,370  
Net appreciation from shares of registered investment companies
    45,493,206        
Net appreciation from common collective trusts
    4,284,853        
Net appreciation from stock funds and self-directed accounts
    4,899,661        
Net appreciation from the Stable Value Fund
    5,105,486       4,872,830  
Net appreciation from the RAFI Enhanced Large Company Fund
    5,372,105        
Interest and dividend income
    4,237,192       7,904,455  
 
           
Total additions
    95,498,255       55,307,812  
 
           
 
               
Deductions
               
Net depreciation from shares of registered investment companies
          88,135,613  
Net depreciation from common collective trusts
          5,559,051  
Net depreciation from stock funds and self-directed accounts
          8,420,085  
Net depreciation from the RAFI Enhanced Large Company Fund
          12,558,099  
Distributions to withdrawing participants
    33,903,237       34,229,706  
Administrative expenses
    721,036       983,036  
 
           
Total deductions
    34,624,273       149,885,590  
 
           
Net increase (decrease)
    60,873,982       (94,577,778 )
 
               
Net assets available for benefits
               
Beginning of year
    288,168,853       382,746,631  
 
           
End of year
  $ 349,042,835     $ 288,168,853  
 
           
The accompanying notes are an integral part of these financial statements.

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Table of Contents

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2009 and 2008
1.   Major Features of the Plan
 
    Background
 
    WESCO Distribution, Inc. Retirement Savings Plan (the “Plan”) was established as of February 28, 1994 (date of inception). At the date of inception, certain employees of the predecessor company became employees of WESCO Distribution, Inc. (the “Company”) and participants in the Plan. At the date of inception, all funds held by the prior plans of the predecessor company related to the employees of the Company were transferred to the Plan.
 
    The Plan is a participant-directed defined contribution plan covering certain employees of the Company and former employees with a fund balance of at least $5,000 who elected to maintain their funds in the Plan. Former employees cannot make contributions to the Plan.
 
    Participation for eligible employees requires an employee to be scheduled to work at least 1,000 hours per year and requires an employee to be paid through the Plan sponsor’s payroll system.
 
    Contributions
 
    The Plan is subject to the Employee Retirement Income Security Act of 1974, as amended (“ERISA”). Participants may elect to make tax deferred contributions ranging from 1% up to the lesser of 50% of their eligible compensation or $16,500. The $16,500 limit may be adjusted in future years by the Internal Revenue Service (“IRS”). The sum of the tax deferred contributions and the after-tax contributions cannot exceed 50% of the participant’s eligible compensation. Subject to limitation, the Company will make matching contributions in an amount equal to 50% of a participant’s total monthly contributions up to a maximum of 3% of their compensation. Also, the Company may, at the Board of Directors’ discretion, make a discretionary contribution to the Plan provided certain predetermined profit levels are attained.
 
    Effective August 1, 2009, the Company suspended employer matching and discretionary contributions; accordingly, no discretionary contributions were made for the Plan’s fiscal year ended December 29, 2009. Discretionary contributions of $8,803,031 were made for the Plan’s fiscal year ended December 29, 2008. Effective January 1, 2010, the Company reinstated employer matching and discretionary contributions that had been suspended since August 1, 2009 with the exception of a certain group of employees comprised of corporate officers and others.
 
    The Plan includes a negative enrollment policy. Under this policy, if an individual does not submit an automatic enrollment waiver or elect a deferral rate, the employee will be automatically enrolled in the Plan at a 3% deferral rate. The deferral rate is increased by 1% each September 1 until the deferral rate equals 6%.
 
    Participants who have attained age 50 before the close of the plan year are eligible to make catch-up contributions in addition to pre-tax contributions. A catch-up contribution is a pre-tax contribution that exceeds the annual deferral limit. A participant’s total catch-up contribution cannot exceed $5,500 in 2009 and $5,000 in 2008. The catch up contribution limits are determined by the IRS and then indexed for inflation. In addition to cash, in-kind contributions are permitted which may consist of stocks, bonds, property or other securities.

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Table of Contents

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2009 and 2008
    Vesting
 
    Participants are fully vested in the value of their contributions and related investment income at all times and vest in their allocated share of employer matching and discretionary contributions according to the following table:
         
Less than two years of service
    0 %
Two years of service
    20 %
Three years of service
    40 %
Four years of service
    66 %
Five or more years of service
    100 %
    In conjunction with a leveraged recapitalization of the Company, all active employees as of June 5, 1998 became fully vested.
 
    Forfeitures
 
    Employer contributions forfeited by participants not vested at their termination date are used to reinstate previously forfeited account balances of former participants who have returned to the Company, reduce employer contributions in accordance with the Plan’s provisions or pay Plan expenses. Total forfeitures that reduced employer contributions in both 2009 and 2008 were approximately $1,099,000. As of December 29, 2009, a balance of approximately $649,000 was available to reduce employer contributions in 2010.
 
    Participant Accounts
 
    An account is maintained for each participant, which is credited with the participant’s and the employer’s matching contributions and an allocation of employer’s discretionary contributions, plan earnings and administrative expenses. Allocations are based on participant contributions or account balances, as defined by the Plan. The benefit to which a participant is entitled is the benefit that can be provided from the participant’s vested account balance.
2.   Summary of Significant Accounting Policies
 
    Accounting Principles
 
    The financial statements of the Plan have been prepared in accordance with accounting principles generally accepted in the United States of America. The following are the significant accounting policies followed by the Plan:
 
    Basis of Accounting
 
    The accounting records of the Plan are maintained on the accrual basis of accounting.
 
    Investment Valuation and Income Recognition
 
    The Plan has adopted a framework for measuring fair value under current accounting pronouncements that requires fair value measurements and enhanced disclosures about fair value measurements. This framework defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction. Disclosures include a fair value hierarchy which requires an entity to maximize the use of observable inputs when measuring fair value.

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WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2009 and 2008
    The three levels of inputs that may be used to measure fair value are as follows:
    Level 1 – Observable inputs such as quoted prices in active markets for identical investments that the Plan has the ability to access.
 
    Level 2 – Inputs include:
  1.   Quoted prices for similar assets or liabilities in active markets;
 
  2.   Quoted prices for identical or similar assets or liabilities in inactive markets;
 
  3.   Inputs, other than quoted prices in active markets, that are observable either directly or indirectly;
 
  4.   Inputs that are derived principally from, or corroborated by, observable market data by correlation or other means.
    Level 3 – Unobservable inputs in which there is little or no market activity for the asset or liability, which require the reporting entity to develop its own estimates and assumptions relating to the pricing of the asset or liability, including assumptions regarding risk.
    The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.
 
    Following is a description of the valuation methodologies used for assets measured at fair value. There have been no changes in the methodologies used as of December 29, 2009 and 2008.
    Common stocks, corporate bonds and U.S. government securities are valued at the closing price reported on the active market on which the individual securities are traded.
 
    Registered investment companies are valued at the net asset value of shares held by the Plan as of December 29.
 
    Common collective trusts are valued at fair value by determining the price of the underlying investments. Equities listed on an exchange are valued at the latest quoted sales price of the exchange on which the security is primarily traded. Securities that are not traded on the valuation date or securities that are not listed on an exchange are valued at the latest bid price provided by the trust’s pricing service.
 
    The Stable Value Fund (Note 7) is valued based on the underlying securities which include corporate bonds, commercial mortgage-backed securities and government securities.
 
    The RAFI Enhanced Large Company Fund is valued based on the underlying securities which include common stocks.
 
    Participant loans are valued at cost, which approximates fair value.
    The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Plan believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement as of the reporting date.

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WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2009 and 2008
    Investment contracts held by a defined-contribution plan are required to be reported at fair value. However, contract value is the relevant measurement attribute for that portion of the net assets available for benefits of a defined-contribution plan attributable to fully benefit-responsive investment contracts, because contract value is the amount participants would receive if they were to initiate permitted transactions under the terms of the plan. As required by current accounting pronouncements, the statement of net assets available for benefits presents the fair value of the investment contracts as well as the adjustment of the fully benefit-responsive investment contracts from fair value to contract value. The statement of changes in net assets available for benefits is prepared on a contract value basis.
 
    Purchases and sales of securities are recorded on a trade date basis. Dividends are recorded on the ex-dividend date. Interest income is recorded on an accrual basis.
 
    Net Appreciation (Depreciation) in Value of Investments
 
    The Plan presents in the statement of changes in net assets available for benefits the net appreciation (depreciation) in the fair value of its investments, consisting of realized gains (losses) and unrealized gains (losses) in the registered investment companies, common collective trusts, Stable Value Fund, RAFI Enhanced Large Company Fund, WESCO International stock and other common stocks.
 
    Use of Estimates
 
    The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make significant estimates and assumptions. These estimates may affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of additions and deductions during the reporting period. Actual results could differ from those estimates.
 
    Risks and Uncertainties
 
    The Plan provides for various investment options in any combination of stocks, bonds, fixed income securities and other investment securities. Investment securities are exposed to various risks, such as interest rate, market and credit risk. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, it is at least reasonably possible that changes in the near-term could materially affect (i) participants’ account balances, and (ii) the amounts reported in the (a) statements of net assets available for benefits and the (b) statements of changes in net assets available for benefits.
 
    Other
 
    All administrative expenses were paid by the Plan during 2009 and 2008.
 
    Payment of Benefits
 
    Benefits are recorded when paid.
 
    Subsequent Events
 
    Management evaluated subsequent events and transactions for potential recognition or disclosure in the financial statements through June 28, 2010, the day the financial statements were approved and authorized for use.

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Table of Contents

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2009 and 2008
3.   Tax Status
 
    The IRS has determined and informed the Company by a letter dated October 15, 2003, that the Plan is designed in accordance with Section 401(a) of the Internal Revenue Code (“IRC”) and, therefore, is exempt from federal taxes under provisions of Section 501(a). Accordingly, no provision for income taxes has been included in the Plan’s financial statements. The Plan has been amended since receiving its determination letter. However, the Plan administrator and the Plan’s tax counsel believe the Plan is designed and is currently being operated in compliance with the applicable requirements of the IRC.
 
4.   Investments
 
    The following tables set forth the fair value of the Plan’s assets by level, as described in Note 2, as of December 29, 2009 and 2008:
                                 
    December 29, 2009  
    Level 1     Level 2     Level 3     Total  
Shares of registered investment companies
  $ 177,568,193     $     $     $ 177,568,193  
Common collective trusts
          20,074,381             20,074,381  
Stock funds and self-directed accounts
    15,724,184                   15,724,184  
Stable Value Fund
          109,219,294             109,219,294  
RAFI Enhanced Large Company Fund
          20,946,580             20,946,580  
Participant loans
                9,154,053       9,154,053  
     
 
  $ 193,292,377     $ 150,240,255     $ 9,154,053     $ 352,686,685  
     
                                 
    December 29, 2008  
    Level 1     Level 2     Level 3     Total  
Shares of registered investment companies
  $ 124,263,627     $     $     $ 124,263,627  
Common collective trusts
          14,054,450             14,054,450  
Stock funds and self-directed accounts
    11,463,975                   11,463,975  
Stable Value Fund
          105,930,357             105,930,357  
RAFI Enhanced Large Company Fund
          17,744,056             17,744,056  
Participant loans
                7,280,126       7,280,126  
     
 
  $ 135,727,602     $ 137,728,863     $ 7,280,126     $ 280,736,591  
     

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Table of Contents

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2009 and 2008
    The table below sets forth a summary of changes in the fair value of the Plan’s level 3 assets for the fiscal year ended December 29, 2009 and 2008:
                 
    Participant Loans  
    2009     2008  
Balance, beginning of year
  $ 7,280,126     $ 6,377,189  
 
               
Purchases, sales, issuances and settlements, net
    1,873,927       902,937  
     
 
               
Balance, end of year
  $ 9,154,053     $ 7,280,126  
     
    Investments (at fair value) representing 5% or more of the net assets available for benefits as of December 29, 2009 and 2008 were as follows:
                 
    2009     2008  
AMCAP Fund (Class R-4)
  $ 32,383,031     $ 22,432,077  
American Balanced Fund (Class A)
    38,040,908       27,656,522  
Columbia Acorn Fund (Class A)
    26,925,313       18,503,267  
RiverSource Midcap Value Fund *
    18,139,384        
Stable Value Fund
    109,219,294       105,930,357  
Thornburg International Value Fund
    22,944,653       16,854,808  
 
*   This fund did not represent 5% or more of the net assets available for benefits as of December 29, 2008.
5.   Participant Loans
 
    Participants are permitted to borrow against a portion of their vested account balance, pursuant to nondiscriminatory rules established by the Administrative Committee, up to a maximum of $50,000 or 50% of their vested account balance. Each loan is to be repaid over a period not to exceed five years.
 
    The interest rate applied to participant loans is established each month by the Administrative Committee at 1% above the PNC Bank prime interest rate. The interest rate on loans outstanding ranged between 4.25% and 10.0% for the fiscal year ended December 29, 2009 and 5.0% and 10.0% for the fiscal year ended December 29, 2008. Principal and interest payments are generally made through monthly payroll deductions and are credited to the participant’s individual account. Loans of approximately $5,965,000 and $4,274,000 were made from the Plan and loan principal repayments of approximately $4,028,000 and $3,264,000 were received by the Plan for the fiscal years ended December 29, 2009 and 2008, respectively. Interest on the loans of approximately $501,000 and $530,000 was earned by the Plan for the fiscal years ended December 29, 2009 and 2008, respectively.

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Table of Contents

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2009 and 2008
6.   Plan Termination
 
    Although the Company has not expressed any intent to do so, it has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions of ERISA. In the event the Plan terminates, participants will become 100% vested in their accounts, and all vested assets shall be distributed to the participants in accordance with the terms of the Plan, or in such other manner, not inconsistent with the requirements of any applicable law or regulation, as the Company may in its sole discretion determine.
 
7.   The Stable Value Fund
 
    During 2007, the Plan began investing in a fully benefit-responsive synthetic guaranteed interest contract (“GIC”) with an insurance company as part of offering the Stable Value Fund (the “Fund”) investment option to participants. Contributions to this Fund are used to purchase units of a collective trust vehicle which is invested in high-quality U.S. bonds, including U.S. government treasuries, corporate debt securities, and other high-credit-quality asset-backed securities. The GIC issuer is contractually obligated to repay the principal and a specified interest rate that is guaranteed to the Plan. There are no reserves against contact value for credit risk of the contract issuer or otherwise.
 
    The Fund has entered into a wrap contract with an insurance company under which the insurance company provides a guarantee with respect to the availability of funds to make distributions from this investment option. This insurance contract is carried at contract value in the participants’ accounts.
 
    Participant accounts in the Fund are credited with interest at a fixed rate that is reset quarterly based on an agreed-upon formula as defined in the contract. The primary variables which could impact the future interest rates that are credited to the participant’s accounts (“credited rates”) include (i) the amount and timing of participant contributions, (ii) transfers and withdrawals into/out of the contract, (iii) the current yield of the assets underlying the contract, (iv) the duration of the assets underlying the contract, and (v) the existing difference between fair value of the securities and the contract value of the assets within the insurance contract. The credited rate of security-backed contracts will track current market yields on a trailing basis. The rate reset feature allows the contract value to converge with the fair value of the underlying portfolio over time, assuming the portfolio continues to earn the current yield for a period of time equal to the current portfolio duration.
 
    To the extent that the underlying portfolio has unrealized and/or realized losses, a positive adjustment is made when reconciling from fair value to contract value under contract value accounting. As a result, the future credited rate may be lower over time than the current market rates. Similarly, if the underlying portfolio generates unrealized and/or realized gains, a negative adjustment is made when reconciling from fair value to contract value, and in the future, the credited rate may be higher than the current market rates. The insurance contract cannot credit an interest rate that is less than zero percent.

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WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2009 and 2008
    Certain events limit the ability of the Plan to transact at contract value with the insurance company. Such events are limited to premature termination of the contract by the Plan or plan termination. The plan sponsor has not expressed any intention to take either of these actions.
 
    As described in Note 2, because the synthetic GIC is fully benefit-responsive, contract value is the relevant measurement attribute for that portion of the net assets available for benefits attributable to the synthetic GICs. Participants may ordinarily direct the withdrawal or transfer of all or a portion of their investment at contract value. The average yields earned by the Fund as of December 29, 2009 and 2008 are as follows:
                 
Average yield for synthetic GICs   2009     2008  
 
Based on actual earnings
    3.47 %     4.39 %
Based on interest rate credited to participants
    4.67 %     4.59 %
8.   Related Party Transactions
 
    Participants of the Plan may elect to invest in WESCO International, Inc. common stock within the WESCO Pooled Stock Fund. WESCO International, Inc. owns 100% of the Company. Therefore, these transactions qualify as party-in-interest transactions. Purchases and sales proceeds within the WESCO Pooled Stock Fund for 2009 were $2,754,000 and $3,086,000, respectively, and purchases and sales proceeds for 2008 were $4,414,000 and $2,305,000, respectively.
 
9.   Reconciliation of Financial Statements to Schedule H of form 5500
 
    The adjustment from fair value to contract value for fully benefit-responsive investment contracts is not recorded on Schedule H of Form 5500 at December 29, 2008.
 
    The following is a reconciliation of net assets available for plan benefits per the financial statements at December 29, 2008 to Form 5500:
         
    2008  
Net assets available for plan benefits per the financial statements
  $ 288,168,853  
Add: Adjustment from contract value for interest in Stable Value Fund relating to fully benefit responsive investment contracts
    2,617,033  
 
     
 
       
Net assets available for plan benefits per Schedule H of Form 5500
  $ 290,785,886  
 
     

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Table of Contents

WESCO Distribution, Inc.
Retirement Savings Plan
Notes to Financial Statements
December 29, 2009 and 2008
    The following is a reconciliation of net appreciation (depreciation), interest, and dividends in fair value of investments per the financial statements for the years ended December 29, 2009 and 2008 to Schedule H of Form 5500:
                 
    2009     2008  
Net appreciation (depreciation), interest, and dividends per the financial statements
  $ 69,392,503     $ (101,895,563 )
Add: Adjustment from contract value for interest in Stable Value Fund relating to fully benefit responsive investment contracts
    (2,617,033 )     933,595  
 
           
 
               
Net appreciation (depreciation), interest, and dividends per Schedule H of Form 5500
  $ 66,775,470     $ (100,961,968 )
 
           

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WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)
        Description of Investment    
    Identity of Issue,   Including Maturity Date,    
    Borrower, Lessor or   Rate of Interest, Collateral,   Current
    Similar Party   Par, or Maturity Value   Value
 
  Alger Institutional Funds   Alger Midcap Growth Institutional Fund   $ 9,610,149  
 
  AMCAP Fund   AMCAP Fund (Class R-4)     32,383,031  
 
  American Funds   American Balanced Fund (Class A)     38,040,908  
 
  Columbia Mutual Funds   Columbia Acorn Fund (Class A)     26,925,313  
 
  Loomis Sayles   Loomis Sayles Invest Grade Bond     16,813,799  
 
  MFS Family of Funds   MFS Value Fund (Class A)     12,710,956  
 
  RiverSource Trust   Midcap Value Fund Class R4     18,139,384  
 
  Thornburg International   Thornburg International Value Fund     22,944,653  
 
               
 
       Registered Investment Companies Total         177,568,193  
 
               
 
               
 
  Manning & Napier Promix Funds   Manning & Napier Promix Conservative Trust     3,981,272  
 
  Manning & Napier Promix Funds   Manning & Napier Promix Extended Trust     4,889,743  
 
  Manning & Napier Promix Funds   Manning &Napier Promix Maximum Trust     7,373,154  
 
  Manning & Napier Promix Funds   Manning & Napier Promix Moderate Trust     3,830,212  
 
               
 
        Common Collective Trusts Total         20,074,381  
 
               
 
               
*
  WESCO International, Inc.   WESCO International Pooled Stock Fund     8,475,131  
 
  3M Company   Common Stock     14,807  
 
  Ameriprise Cash   Cash and cash equivalents     (46 )
 
  ABB Ltd Adr   Common Stock     12,698  
 
  Abitibibowater Inc   Common Stock     643  
 
  Acorda Therapeutics Inc.   Common Stock     1,270  
 
  ADR Cemex   Common Stock     12,636  
 
  Advanced Battery Technologies Inc.   Common Stock     5,835  
 
  Advanced Energy Industries   Common Stock     3,363  
 
  AGL Resources   Common Stock     37,090  
 
  Aimco   Common Stock     5,611  
 
  Alcatel-Lucent Ads   Common Stock     191  
 
  Alcoa Inc.   Common Stock     16,416  
 
  Allos Therapeutics Inc.   Common Stock     3,250  
 
  Alpine Total Dynamic Dividend Fund   Closed-end Fund     349,390  
 
  Altria Group Inc.   Common Stock     993  
 
  Ambac Financial Group   Common Stock     2,520  
 
  American Beacon Funds   Large Cap Value Fund     6,332  
 
  American Century Funds   Diversified Bond Fund     296,883  
 
  American Century Funds   Ginne Mae Fund     107,171  
 
  American Century Funds   International Bond Fund     15,775  
 
  American Semiconductor Group   Common Stock     4,199  
 
  Anadarko Petroleum Corp.   Common Stock     6,400  
 
  AOL Inc.   Common Stock     1,513  
 
  Apache Corp.   Common Stock     10,452  
 
  Apple Inc.   Common Stock     103,505  
 
  Applied Materials   Common Stock     1,333  
 
  Arcadia Resources, Inc.   Common Stock     409  

13


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)
        Description of Investment    
    Identity of Issue,   Including Maturity Date,    
    Borrower, Lessor or   Rate of Interest, Collateral,   Current
    Similar Party   Par, or Maturity Value   Value
 
  Artisan Funds   International Investor Shrs     5,484  
 
  AT&T Inc   Common Stock     3,020  
 
  Atlas Pipeline Partners LP   Common Stock     239  
 
  Authentec Inc   Common Stock     6,944  
 
  Azteca Gold Corp   Common Stock     1,151  
 
  B & G Foods Inc.   Common Stock     36,336  
 
  Baidu.com Inc.   Common Stock     148,549  
 
  Bank America Corp   Common Stock     1,512  
 
  Barclays Bank Plc   Common Stock     4,230  
 
  Bebida Beverage Co   Common Stock     1  
 
  Bemis Co   Common Stock     8,576  
 
  Berkshire Hathaway Inc.   Common Stock     9,840  
 
  Bhp Billiton Ltp-Spon Adr   Common Stock     7,635  
 
  Biogen Idec Inc.   Common Stock     1,335  
 
  Biotime Inc.   Common Stock     119  
 
  Boeing Co.   Common Stock     11,042  
 
  BP Plc   Common Stock     17,846  
 
  Bucyrus International Inc.   Common Stock     152,578  
 
  Budget Group Inc.   Common Stock     13  
 
  Buffalo   Small Cap Fund     11,960  
 
  Burlington Northern Inc   Common Stock     1,969  
 
  By Prudhoe Bay Royalty Trust   Common Stock     3,265  
 
  CanWest Petroleum Inc.   Common Stock     3,570  
 
  Cardium Therapeutics Inc.   Common Stock     4,770  
 
  Caterpillar Inc.   Common Stock     28,815  
 
  CBS Corp. Class B   Common Stock     57,013  
 
  Cef Select Sector SPDR   Common Stock     38,934  
 
  Celgene Corp.   Common Stock     16,836  
 
  Cell Therapeutics   Common Stock     3,510  
 
  Cheniere Energy Inc   Common Stock     516  
 
  Chesapeake Energy   Common Stock     9,356  
 
  Chevron Corp.   Common Stock     7,721  
 
  Chicago Bridge & Iron Co.   Common Stock     5,470  
 
  Cinemark Holdings Inc.   Common Stock     2,856  
 
  Circuit City Stores   Common Stock     6  
 
  Citigroup Inc.   Common Stock     17,019  
 
  Clean Energy Fuels Corp.   Common Stock     3,883  
 
  Clinical Data Inc.   Common Stock     4,892  
 
  Compass Minerals International   Common Stock     17,088  
 
  Coronado Res LTD   Common Stock     4,477  
 
  Corporate Exec Board   Common Stock     2,326  
 
  Costco Whsl Corp. New   Common Stock     6,448  
 
  CrossTex Energy Inc   Common Stock     1,866  
 
  Crowflight Minerals Inc.   Common Stock     149  
 
  CSR PLC Cambridge   Common Stock     925  
 
  CTS Corp.   Common Stock     956  

14


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)
        Description of Investment    
    Identity of Issue,   Including Maturity Date,    
    Borrower, Lessor or   Rate of Interest, Collateral,   Current
    Similar Party   Par, or Maturity Value   Value
 
  Cubist Pharmaceuticals   Common Stock     3,826  
 
  Deere & Co   Common Stock     7,251  
 
  Del Global Technologies Corp.   Common Stock     60  
 
  Deliste Incorporated   Common Stock     2  
 
  Delta Petroleum Corp.   Common Stock     2,380  
 
  Diamond Offshore Drilling   Common Stock     10,040  
 
  Diana Shipping Inc.   Common Stock     7,445  
 
  Discovery Laboratories Inc.   Common Stock     1,890  
 
  Dodge & Cox Funds   Balanced Fund     137,628  
 
  Dodge & Cox Funds   Income Fund     75,555  
 
  Dodge & Cox Funds   Stock Fund     75,591  
 
  Dorchester Minerals LP   Common Stock     2,153  
 
  Dow Chemical   Common Stock     11,775  
 
  Duluth Metals LTD   Common Stock     7,134  
 
  Duoyuan Global Water Inc. Sponsored ADR   Common Stock     23,019  
 
  Dynamic Materials Corp.   Common Stock     1,820  
 
  E Trade Financial Corp.   Common Stock     8,850  
 
  Eaton Corp.   Common Stock     46,422  
 
  Energy Transfer Equity LP   Common Stock     6,337  
 
  Energy Transfer Patners LP   Common Stock     10,561  
 
  Enterprise Product Partners   Common Stock     9,459  
 
  EON AG.SP ADR   Common Stock     14,072  
 
  Excellon Resources Inc.   Common Stock     2,557  
 
  Excelsior Funds   Value & Restructuring Fund     11,518  
 
  Exide Technologies   Common Stock     36,250  
 
  Exxon Mobil Corp.   Common Stock     21,685  
 
  Fastenal Company   Common Stock     8,396  
 
  Federal Mogul Corp.   Common Stock     1  
 
  Fibertower Corp.   Common Stock     2,484  
 
  First Horizon National Corp   Common Stock     4,086  
 
  First Niagara Financial Group   Common Stock     4,265  
 
  Flowserve Corp   Common Stock     9,666  
 
  Federal Mogul Corp.   Series D Convertible Class A Preferred Stock     136  
 
  Ford Motor Company   Common Stock     5,055  
 
  Forest Labs   Common Stock     9,741  
 
  Fortescue Metal Group LTD   Common Stock     584  
 
  Fortum Corporation   Common Stock     18,633  
 
  Franconia Minerals Corp.   Common Stock     1,191  
 
  Freeport McMoran Copper & Gold Inc.   Common Stock     8,109  
 
  Fuel Systems Solutions   Common Stock     12,684  
 
  Fuel-Tech   Common Stock     3,830  
 
  Gamco International Growth AAA   Foreign Large Growth Fund     16,180  
 
  General Electric   Common Stock     164,920  
 
  General Money Market Fund Inc. Class A   General Money Market Fund     1,022,550  
 
  Genzyme Corp.   Common Stock     4,981  
 
  GMX Resources Inc.   Common Stock     7,025  

15


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)
        Description of Investment    
    Identity of Issue,   Including Maturity Date,    
    Borrower, Lessor or   Rate of Interest, Collateral,   Current
    Similar Party   Par, or Maturity Value   Value
 
  Goldcorp Inc.   Common Stock     3,951  
 
  Goldman Sachs Group   Common Stock     32,824  
 
  Harbor Funds   International Fund     45,060  
 
  Harbor Funds   Bond Fund — Institutional Class     11,599  
 
  Hawaiian Electric Ind. Inc.   Common Stock     23,229  
 
  Headwaters Inc.   Common Stock     2,372  
 
  Heartland Funds   Select Value Fund     22,488  
 
  Hewlett Packard   Common Stock     21,028  
 
  Honeywell Intl Inc.   Common Stock     26,121  
 
  Huntington Bancshare   Common Stock     1,115  
 
  I Shares   Silver Trust     7,565  
 
  I Shares   TR JBOXX High Yield Corporate Bond Fund     2,620  
 
  I Shares   S&P Global Telecom Fund     10,998  
 
  I Shares   DJ Select Dividend Index Fund     8,026  
 
  I Shares   S&P Global 100     4,876  
 
  I Shares   S&P Gloal Finl Sector     5,011  
 
  I Shares   DJ U.S. Consumer Cycl SEC Fund     2,812  
 
  I Shares   TR Dow Jones US Aerospace & Defense Equity Fund     7,755  
 
  Icon Funds   Icon Healthcare Fund     43,927  
 
  Icon Funds   International Equity Fund     36,906  
 
  IGO Inc.   Common Stock     14,160  
 
  Integral Technologies Inc.   Common Stock     3,933  
 
  Intel Corp.   Common Stock     22,442  
 
  International Pkg & Logistics   Common Stock     2  
 
  Interplay Entertainment   Common Stock     55  
 
  Intl Speedway   Common Stock     8,162  
 
  Intuitive Surgical Inc.   Common Stock     30,658  
 
  Invio Biomedical Corp.   Common Stock     1,740  
 
  Ivanhoe Energy, Inc.   Common Stock     303  
 
  J.P. Morgan Chase & Co.   Common Stock     18,671  
 
  Janus Funds   Global Technology Fund     13,060  
 
  Janus Funds   Overseas Fund     128,828  
 
  Janus Funds   Mid Cap Value Fund     24,230  
 
  Janus Funds   Enterprise Fund     19,891  
 
  Janus Funds   Special Equity Fund     12,943  
 
  Janus Funds   Orion Fund     10,350  
 
  Johnson & Johnson   Common Stock     5,390  
 
  Joy Global Inc.   Common Stock     7,850  
 
  Keryx Biopharmaceuticals   Common Stock     466  
 
  Kinder Morgan Energy Partners LP   Common Stock     15,173  
 
  Klondike Silver Corp.   Common Stock     2  
 
  Koko Petroleum Inc.   Common Stock     12  
 
  Kona Grill Inc.   Common Stock     637  
 
  Kraft Foods   Common Stock     933  
 
  Las Vegas Sands Corp.   Common Stock     7,645  

16


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)
        Description of Investment    
    Identity of Issue,   Including Maturity Date,    
    Borrower, Lessor or   Rate of Interest, Collateral,   Current
    Similar Party   Par, or Maturity Value   Value
 
  Lehman Brothers Holdings Inc   Preferred Stock     52  
 
  Lowes Companies   Common Stock     7,083  
 
  Managers Intermediate Duration Govt   Fixed Fund     47,743  
 
  Manhattan Pharmaceuticals   Common Stock     312  
 
  Manitowoc Inc.   Common Stock     22,658  
 
  Mannkind Corp   Common Stock     3,404  
 
  Marisco   21st Century Mutual Fund     6,756  
 
  Marsico   Large Growth Fund     23,251  
 
  Market Vectors ETF TR   Agribusiness Fund     6,518  
 
  Market Vectors ETF TR   Global Alternative Energy Fund     3,755  
 
  Masco Corp   Common Stock     42,030  
 
  Matrix Advisors   Value Fund     39,201  
 
  Maxwell Technologies Inc   Common Stock     701  
 
  MBIA Inc.   Common Stock     12,180  
 
  MDRNA Inc.   Common Stock     164  
 
  Medoro Res LTD   Common Stock     2,320  
 
  Merck & Co.   Common Stock     8,719  
 
  Metalico Inc.   Common Stock     1,723  
 
  Microsoft Corp.   Common Stock     31,439  
 
  Mosaic Co.   Common Stock     2,924  
 
  Myriad Pharmaceuticals Inc.   Common Stock     1,566  
 
  Nacel Energy Corp.   Common Stock     1,740  
 
  Neomedia Technologies   Common Stock     110  
 
  Nestle SA Sponsored ADR   Common Stock     19,172  
 
  Netlist Inc.   Common Stock     2,700  
 
  Neuberger Berman   Real Estate Fund     14,734  
 
  Newcastle Investment Corp.   Common Stock     399  
 
  Nokia Corp.   Common Stock     5,415  
 
  Nordic American   Common Stock     6,030  
 
  Northern Funds   High Yield Fixed Income Fund     11,050  
 
  Nucor Corp   Common Stock     9,212  
 
  Nvdia Corp   Common Stock     2,703  
 
  Oakmark Funds   Global Fund     50,367  
 
  Oakmark Funds   Mutual Fund     13,242  
 
  Oakmark Funds   Oakmark Equity and Income Fund (I)     37,941  
 
  Oakmark Funds   International Fund (Class I)     11,032  
 
  Oneok Partners LP   Common Stock     9,384  
 
  Oracle Systems   Common Stock     7,503  
 
  Oshkosh Corporation   Common Stock     12,194  
 
  Palomar Medical Tech   Common Stock     18,940  
 
  Parnassus Income Trust   Equity Income Fund     50,386  
 
  Paychex Inc.   Common Stock     4,644  
 
  Peabody Energy Corp   Common Stock     3,922  
 
  Petroquest Energy Inc.   Common Stock     3,155  
 
  Petroleo Brasileiro SA Petrobas Sponsored ADR   Common Stock     23,383  
 
  Pfizer Inc.   Common Stock     3,924  

17


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
Philip Morris International Inc.
  Common Stock     2,443  
   
PIMCO Funds
  Real Return Fund     9,672  
   
PNC Financial Services Group
  Common Stock     1,490  
   
PNM Resources Inc.
  Common Stock     57,060  
   
Polymet Mining Corp.
  Common Stock     15,211  
   
Potash Corp of Saskatchewan
  Common Stock     32,878  
   
Powershares
  Agricultural Fund     18,972  
   
Powershares
  DB Multi Sector Commodity TR     75,049  
   
Powershares
  Global Water Portfolio Fund     10,265  
   
Precision Castparts
  Common Stock     8,443  
   
Prestige Brand Holdings
  Common Stock     6,424  
   
Proshares TR
  Ultra Financial Fund     194,621  
   
Qualcomm Inc.
  Common Stock     2,333  
   
Range Resources Corp.
  Common Stock     5,108  
   
Rayonier Inc
  Common Stock     853  
   
Research In Motion LTD
  Common Stock     10,797  
   
Reserve Primary Fund
  Primary Fund     46,767  
   
RF Micro-Devices
  Common Stock     14,610  
   
Rino International Corporation
  Common Stock     2,820  
   
Royce
  Total Return Fund     6,202  
   
RRI Energy Inc.
  Common Stock     8,820  
   
RS Partners
  Growth Fund     3,849  
   
RVS
  Mid Cap Growth Fund     80,382  
   
Riversource Trust
  Diversified Bond Class R4 Fund     84,968  
   
Riversource Trust
  High Yield Class R4 Bond Fund     56,039  
   
Sasol LTD ADR
  Common Stock     23,109  
   
Seligman
  Global Technology Fund     94,463  
   
Sequenom Inc.
  Common Stock     170  
   
Short QQQ
  Equity Fund     13,029  
   
Silver Grail Res LTD
  Common Stock     2,716  
   
Silver Star Energy
  Common Stock     3  
   
Sirius Satellite Radio Inc.
  Common Stock     355  
   
SIT Funds
  US Government Securities Fund     170,314  
   
Sound Shore Fund
  Common Stock     5,805  
   
SPDR
  Series Trust Fund     63,498  
   
Spectra Energy Corp.
  Common Stock     5,140  
   
SSGA
  International Stock Selection Fund     42,395  
   
Statiol ASA Group
  Common Stock     20,590  
   
Strategic Resource Acquisition Corp
  Common Stock     314  
   
Sun Microsystems
  Common Stock     159  
   
Sysco Corp.
  Common Stock     6,660  
   
T. Rowe Price Funds
  Balanced Fund     95,419  
   
T. Rowe Price Funds
  Capital Appreciation Fund     119,794  
   
T. Rowe Price Funds
  New Era Fund     109,462  
   
T. Rowe Price Funds
  Growth Stock Fund     45,752  
   
T. Rowe Price Funds
  Spectrum International Fund     15,973  

18


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
T. Rowe Price Funds
  Dividend Growth Fund     4,644  
   
TCW Funds, Inc.
  Focused Equities Fund     13,651  
   
Terra Nitrogen Company
  Common Stock     10,475  
   
Teton Energy Corp.
  Common Stock     60  
   
The India Fund Inc.
  Equity Fund     11,605  
   
The Muhlenkamp Fund
  Equity Fund     7,306  
   
Third Avenue
  Real Estate Value Fund     4,789  
   
Third Avenue
  International Value Fund     53,130  
   
Third Avenue
  Value Fund     16,199  
   
Third Avenue
  Small Cap Value Fund     27,002  
   
Thompson Plumb and Associates
  Growth Fund     3,897  
   
Threadneedle
  Emerging Markets Fund     51,132  
   
Time Warner Cable Inc.
  Common Stock     35,684  
   
Time Warner Inc.
  Common Stock     20,586  
   
Titanium Metals Corp.
  Common Stock     7,428  
   
Transocean Inc.
  Common Stock     16,726  
   
Trinity Industries Inc.
  Common Stock     3,641  
   
Tumi Res LTD
  Common Stock     1,783  
   
TVIA Inc.
  Common Stock     21,500  
   
UIL Holdings Corp
  Common Stock     28,630  
   
Ultra Petroleum Corp.
  Common Stock     10,230  
   
Ultrashort Financial
  Exchange Traded Fund     96,120  
   
Ultrashort QQQ
  Exchange Traded Fund     56,520  
   
Unigene Labs Inc.
  Common Stock     4,608  
   
US Bancorp
  Common Stock     8,956  
   
Valeant Pharmaceuticals Intl.
  Common Stock     3,217  
   
Vanguard Funds
  Specialized Portfolios - Dividend Appreciation     18,948  
   
Vanguard Funds
  Windsor II Fund     45,745  
   
Vanguard Funds
  Wellesley Income Fund     24,407  
   
Vanguard Funds
  International Value Fund     21,144  
   
Vanguard Funds
  International Growth Fund     21,825  
   
Vecima Networks Inc
  Common Stock     5  
   
Veolia Environment ADR
  Common Stock     4,979  
   
Verizon Communications
  Common Stock     3,343  
   
Viacom Inc.
  Common Stock Class B     112,672  
   
Walgreen Co
  Common Stock     7,446  
   
Wasatch Heritage Growth Fund
  Growth Fund     10,165  
   
Washington Mutual Savings Bank
  Common Stock     13,514  
   
Wells Fargo & Co
  Common Stock     10,672  
   
White Mountains Insurance Group
  Common Stock     3,641  
   
Windstream Corp
  Common Stock     33,300  
   
Wynn Resorts, Limited
  Common Stock     5,893  
   
Yara International ASA Sponsored ADR
  Common Stock     11,557  
   
Stock Funds and Self-Directed
           
   
 
         
   
Accounts Total
        15,724,184  
   
 
         

19


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
Institutional Enhanced Index Fixed
           
   
Income Fund
  Common Collective Trust     109,219,294  
   
Wrapper Contract
  Wrapper Contract      
   
 
         
   
Stable Value Fund Total
        109,219,294  
   
 
         
   
 
           
   
EVERGREEN INST MONEY MARKET FUND CL I (FD #495)
  Cash and Cash Equivalents     378,580  
   
3M CO COM
  Common Stock     76,053  
   
ABBOTT LABS COM
  Common Stock     63,430  
   
ABERCROMBIE & FITCH CO CL A
  Common Stock     6,392  
   
ABM INDS INC COM
  Common Stock     2,974  
   
ACCENTURE LTD COM
  Common Stock     47,477  
   
ACTUANT CORP COM
  Common Stock     2,656  
   
ACUITY BRANDS INC COM
  Common Stock     4,189  
   
ADOBE SYS INC COM
  Common Stock     8,074  
   
ADVANCE AUTO PARTS COM
  Common Stock     5,951  
   
AECOM TECHNOLOGY CORP COM
  Common Stock     4,054  
   
AES CORP COM
  Common Stock     21,450  
   
AETNA INC COM
  Common Stock     37,033  
   
AFFILIATED COMPUTER SVCS INC CL A
  Common Stock     4,832  
   
AFFILIATED MANAGERS GROUP COM
  Common Stock     3,306  
   
AFLAC INC COM
  Common Stock     39,532  
   
AGCO CORP COM
  Common Stock     10,685  
   
AGILENT TECHNOLOGIES INC COM
  Common Stock     16,196  
   
AGL RES INC COM
  Common Stock     5,378  
   
AIR PRODUCTS & CHEMICALS INC COM
  Common Stock     14,056  
   
AIRCASTLE LTD COM
  Common Stock     3,715  
   
AK STEEL HLDG CORP COM
  Common Stock     14,646  
   
ALBEMARLE CORP COM
  Common Stock     5,503  
   
ALBERTO-CULVER CO COM
  Common Stock     4,213  
   
ALCOA INC COM
  Common Stock     59,263  
   
ALEXANDER & BALDWIN INC COM
  Common Stock     4,598  
   
ALEXANDRIA REAL ESTATE EQUITIES COM
  Common Stock     5,528  
   
ALLEGHANY CORP DEL COM
  Common Stock     5,174  
   
ALLEGHENY ENERGY INC COM
  Common Stock     4,969  
   
ALLEGHENY TECHNOLOGIES INC COM
  Common Stock     13,087  
   
ALLERGAN INC COM
  Common Stock     6,425  
   
ALLIANCE RESOURCE PARTNERS LP COM
  Common Stock     2,917  
   
ALLIANCEBERNSTEIN HOLDING LP
  Common Stock     5,940  
   
ALLIANT ENERGY CORP COM
  Common Stock     7,630  
   
ALLIANT TECHSYSTEMS INC COM
  Common Stock     2,162  
   
ALLIED CAP CORP NEW COM
  Common Stock     11,326  
   
ALLIED WORLD ASSURANCE HOLD COM
  Common Stock     8,834  
   
ALLSTATE CORP COM
  Common Stock     63,390  
   
ALTERA CORP COM
  Common Stock     5,665  

20


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
ALTRIA GROUP INC COM
  Common Stock     149,312  
   
AMAZON COM INC COM
  Common Stock     19,936  
   
AMERCO COM
  Common Stock     5,911  
   
AMEREN CORP COM
  Common Stock     33,912  
   
AMERICAN EAGLE OUTFITTERS INC NEW COM
  Common Stock     7,353  
   
AMERICAN ELEC PWR CO INC COM
  Common Stock     31,011  
   
AMERICAN EXPRESS COMPANY COM
  Common Stock     103,181  
   
AMERICAN FINL GRP INC OHIO COM
  Common Stock     13,796  
   
AMERICAN GREETINGS CORP CL A COM
  Common Stock     4,382  
   
AMERICAN INTL GRP INC COM
  Common Stock     15,513  
   
AMERICAN NATL INS CO COM
  Common Stock     7,838  
   
AMERICAN TOWER CORP CL A
  Common Stock     4,232  
   
AMERICAN WATER WORKS CO INC COM
  Common Stock     4,988  
   
AMERIGAS PARTERNS LP UNIT LTD PARTNERSHIP
  Common Stock     2,857  
   
AMERIGROUP CORPORATION COM
  Common Stock     2,747  
   
AMERIPRISE FINANCIAL INC COM
  Common Stock     17,026  
   
AMERISOURCEBERGEN CORP COM
  Common Stock     58,594  
   
AMERISTAR CASINOS INC COM
  Common Stock     1,650  
   
AMGEN INC COM
  Common Stock     23,238  
   
AMKOR TECHNOLOGY INC COM
  Common Stock     5,494  
   
AMPHENOL CORP NEW CL A
  Common Stock     416  
   
AMR CORP DEL COM
  Common Stock     25,035  
   
ANADARKO PETROLEUM CORP COM
  Common Stock     45,376  
   
ANALOG DEVICES INC COM
  Common Stock     10,082  
   
ANIXTER INTL INC COM
  Common Stock     3,182  
   
ANNALY MTG MGMT INC COM
  Common Stock     5,177  
   
ANNTAYLOR HLDGS INC COM
  Common Stock     5,581  
   
AOL INC COM
  Common Stock     8,348  
   
AON CORP COM
  Common Stock     16,128  
   
APACHE CORP COM
  Common Stock     33,028  
   
APARTMENT INVT & MGMT CO CL A
  Common Stock     6,412  
   
APOLLO GRP INC CL A
  Common Stock     4,515  
   
APPLE INC COM
  Common Stock     83,222  
   
APPLIED INDL TECHNOLOGIES INC COM
  Common Stock     2,322  
   
APPLIED MATERIALS INC COM
  Common Stock     15,980  
   
APTARGROUP INC RST
  Common Stock     4,436  
   
AQUA AMERICA INC
  Common Stock     2,732  
   
ARCH CAPITAL GROUP LTD COM
  Common Stock     18,183  
   
ARCH CHEMICALS INC COM
  Common Stock     1,693  
   
ARCHER DANIELS MIDLAND CO COM
  Common Stock     46,187  
   
ARKANSAS BEST CORP DEL COM
  Common Stock     3,806  
   
ARMSTRONG WORLD INDUSTRIES COM
  Common Stock     25,790  
   
ARROW ELECTRS INC COM
  Common Stock     20,096  
   
ARTHUR J. GALLAGHER & CO COM
  Common Stock     5,560  
   
ARVINMERITOR INC COM
  Common Stock     28,856  

21


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
ASBURY AUTOMOTIVE GROUP COM
  Common Stock     2,062  
   
ASHLAND INC COM
  Common Stock     14,793  
   
ASPEN INSURANCE HOLDINGS LTD COM
  Common Stock     7,359  
   
ASSOCIATED BANC CORP COM
  Common Stock     11,221  
   
ASSURANT INC COM
  Common Stock     13,657  
   
ASSURED GUARANTY LTD COM
  Common Stock     1,133  
   
AT&T INC COM
  Common Stock     296,833  
   
ATLAS ENERGY INC COM`
  Common Stock     5,199  
   
ATLAS PIPELINE PARTNERS-UTS COM
  Common Stock     3,750  
   
ATMEL CORP COM
  Common Stock     2,658  
   
ATMOS ENERGY CORP COM
  Common Stock     4,629  
   
AUTODESK INC COM
  Common Stock     5,893  
   
AUTOLIV INC COM
  Common Stock     9,594  
   
AUTOMATIC DATA PROCESSING INC COM
  Common Stock     32,501  
   
AUTONATION INC DEL COM
  Common Stock     11,339  
   
AUTOZONE INC COM
  Common Stock     7,974  
   
AVALONBAY CMNTYS INC COM
  Common Stock     6,397  
   
AVERY DENNISION CORP COM
  Common Stock     9,678  
   
AVIS BUDGET GROUP INC COM
  Common Stock     36,680  
   
AVISTA CORP COM
  Common Stock     4,553  
   
AVNET INC COM
  Common Stock     12,669  
   
AVON PRODS INC COM
  Common Stock     22,062  
   
AVX CORP NEW COM
  Common Stock     4,205  
   
AXIS CAPITAL HOLDINGS LTD COM
  Common Stock     16,586  
   
BAKER HUGHES INC COM
  Common Stock     12,705  
   
BALDOR ELECTRIC CO COM
  Common Stock     2,784  
   
BALL CORP COM
  Common Stock     7,146  
   
BANCORPSOUTH INC COM
  Common Stock     3,460  
   
BANK OF AMERICA CORP COM
  Common Stock     540,691  
   
BANK OF HAWAII CORP COM
  Common Stock     5,791  
   
BANK OF NEW YORK MELLON CORP COM
  Common Stock     41,196  
   
BARE ESCENTUALS INC COM
  Common Stock     7,569  
   
BARNES & NOBLE INC COM
  Common Stock     4,769  
   
BARNES GROUP INC
  Common Stock     2,683  
   
BAXTER INTL INC COM
  Common Stock     36,177  
   
BB&T CORP COM
  Common Stock     57,510  
   
BECKMAN COULTER INC COM
  Common Stock     4,493  
   
BECTON DICKINSON & CO COM
  Common Stock     10,443  
   
BED BATH & BEYOND INC COM
  Common Stock     8,646  
   
BELDEN INC COM
  Common Stock     3,453  
   
BEMIS CO INC COM
  Common Stock     8,305  
   
BENCHMARK ELECTRONICS INC COM
  Common Stock     5,135  
   
BERKLEY W R CORP COM
  Common Stock     11,438  
   
BERKSHIRE HATHAWAY INC DEL CL B
  Common Stock     268,960  
   
BEST BUY INC COM
  Common Stock     21,342  
   
BIG LOTS INC COM
  Common Stock     4,410  

22


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
BIOGEN IDEC INC COM
  Common Stock     6,408  
   
BIO RAD LABS INC CL A
  Common Stock     3,332  
   
BJ SVCS CO COM
  Common Stock     7,069  
   
BJS WHSL CLUB INC COM
  Common Stock     6,847  
   
BLACK & DECKER CORP COM
  Common Stock     18,527  
   
BLACKROCK INC COM
  Common Stock     34,163  
   
BLACKSTONE GROUP LP COM
  Common Stock     35,463  
   
BLOCK H & R INC COM
  Common Stock     8,910  
   
BMC SOFTWARE INC COM
  Common Stock     4,112  
   
BOARDWALK PIPELINE PARTNERS COM
  Common Stock     6,640  
   
BOB EVANS FARMS INC COM
  Common Stock     2,305  
   
BOEING CO COM
  Common Stock     98,550  
   
BOK FINANCIAL CORP COM
  Common Stock     5,654  
   
BORG WARNER INC COM
  Common Stock     5,692  
   
BOSTON PPTYS INC COM
  Common Stock     13,290  
   
BOSTON SCIENTIFIC CORP COM
  Common Stock     18,381  
   
BRADY CORP CL A
  Common Stock     3,661  
   
BRE PPTYS INC CL A
  Common Stock     5,472  
   
BRIGGS & STRATTON CORP COM
  Common Stock     3,887  
   
BRIGHTPOINT INC COM
  Common Stock     3,814  
   
BRINKER INTL INC COM
  Common Stock     4,060  
   
BRINKS CO COM
  Common Stock     2,702  
   
BRISTOL-MYERS SQUIBB CO COM
  Common Stock     96,472  
   
BROADCOM CORP COM
  Common Stock     6,104  
   
BROADRIDGE FINANCIAL SOLUTIONS COM
  Common Stock     4,211  
   
BROWN & BROWN INC COM
  Common Stock     2,731  
   
BROWN SHOE INC NEW COM
  Common Stock     4,230  
   
BROWN-FORMAN CORP CL B COM
  Common Stock     4,228  
   
BRUNSWICK CORP COM
  Common Stock     14,792  
   
BUCKLE INC COM
  Common Stock     1,900  
   
BUCYRUS INTERNATIONAL INC COM
  Common Stock     5,621  
   
BUNGE LTD COM
  Common Stock     41,987  
   
BURGER KING HOLDINGS INC COM
  Common Stock     3,005  
   
BURLINGTON NORTHERN SANTA FE COM
  Common Stock     37,214  
   
C H ROBINSON WORLDWIDE INC COM
  Common Stock     9,998  
   
C R BARD INC COM
  Common Stock     4,187  
   
CA INC COM
  Common Stock     9,108  
   
CABELAS INC CL A COM
  Common Stock     3,550  
   
CABLEVISION SYSTEMS NY GRP CL A
  Common Stock     2,867  
   
CABOT CORP COM
  Common Stock     3,836  
   
CALPINE CORP COM
  Common Stock     7,056  
   
CAMERON INTERNATIONAL CORP COM
  Common Stock     12,037  
   
CAMPBELL SOUP CO COM
  Common Stock     12,799  
   
CAPITAL ONE FINANCIAL CORP COM
  Common Stock     120,305  
   
CAPITALSOURCE INC COM
  Common Stock     5,341  
   
CARDINAL HLTH INC COM
  Common Stock     50,150  

23


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
CAREER ED CORP COM
  Common Stock     3,644  
   
CAREFUSION CORP COM
  Common Stock     15,405  
   
CARLISLE COS INC COM
  Common Stock     4,306  
   
CARMAX INC COM
  Common Stock     3,660  
   
CARNIVAL CORP COM
  Common Stock     23,981  
   
CARPENTER TECHNOLOGY CORP COM
  Common Stock     5,056  
   
CASEYS GEN STORES INC COM
  Common Stock     4,214  
   
CATERPILLAR INC COM
  Common Stock     46,719  
   
CATHAY BANCORP INC COM
  Common Stock     1,981  
   
CB RICHARD ELLIS GROUP INC COM
  Common Stock     6,900  
   
CBS CORP COM
  Common Stock     92,027  
   
CDI CORP COM
  Common Stock     2,755  
   
CEDAR FAIR L P DEPOSITARY UNIT
  Common Stock     2,850  
   
CELANESE CORP COM
  Common Stock     12,293  
   
CELGENE CORP COM
  Common Stock     3,816  
   
CENTERPOINT ENERGY INC COM
  Common Stock     10,524  
   
CENTURY ALUM CO COM
  Common Stock     12,348  
   
CENTURYTEL INC COM
  Common Stock     12,443  
   
CERNER CORP COM
  Common Stock     4,940  
   
CF INDUSTRIES HOLDINGS INC COM
  Common Stock     7,185  
   
CH ENERGY GRP INC COM
  Common Stock     1,654  
   
CHARLES RIV LABORATORIES INTL COM
  Common Stock     4,111  
   
CHESAPEAKE ENERGY CORP COM
  Common Stock     9,676  
   
CHEVRON CORP COM
  Common Stock     203,912  
   
CHIPOTLE MEXICAN GRILL CL B COM
  Common Stock     2,282  
   
CHIQUITA BRANDS INTL INC COM
  Common Stock     7,437  
   
CHUBB CORP COM
  Common Stock     64,171  
   
CHURCH & DWIGHT CO COM
  Common Stock     2,164  
   
CIGNA CORP COM
  Common Stock     30,018  
   
CIMAREX ENERGY CO COM
  Common Stock     9,149  
   
CINCINNATI FINL CORP COM
  Common Stock     16,930  
   
CINEMARK HOLDINGS INC COM
  Common Stock     3,770  
   
CINTAS CORP COM
  Common Stock     4,177  
   
CISCO SYSTEMS INC COM
  Common Stock     86,905  
   
CITIGROUP INC COM
  Common Stock     421,907  
   
CITRIX SYS INC COM
  Common Stock     1,013  
   
CITY NATL CORP COM
  Common Stock     7,371  
   
CLEAN HBRS INC COM
  Common Stock     3,084  
   
CLEAR CHANNEL OUTDOOR CL A COM
  Common Stock     6,859  
   
CLECO CORP NEW COM
  Common Stock     2,772  
   
CLIFFS NATURAL RESOURCES INC COM
  Common Stock     5,983  
   
CLOROX CO COM
  Common Stock     5,751  
   
CME GROUP INC COM
  Common Stock     6,429  
   
CMS ENERGY CORP COM
  Common Stock     6,153  
   
CNA FINL CORP COM
  Common Stock     31,637  
   
COACH INC COM
  Common Stock     6,034  

24


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
COCA COLA ENTERPRISES INC COM
  Common Stock     22,100  
   
COCA-COLA CO COM
  Common Stock     125,700  
   
COGNIZANT TECH SOLUTIONS CRP COM CL A
  Common Stock     3,691  
   
COLGATE-PALMOLIVE CO COM
  Common Stock     44,082  
   
COLLECTIVE BRANDS INC COM
  Common Stock     4,686  
   
COLUMBIA SPORTSWEAR CO COM
  Common Stock     4,688  
   
COMCAST HLDGS INC CL A
  Common Stock     71,668  
   
COMERICA INC COM
  Common Stock     29,750  
   
COMMERCE BANCSHARES INC COM
  Common Stock     5,428  
   
COMMERCIAL METALS CO COM
  Common Stock     2,028  
   
COMMUNITY HEALTH SYS INC NEW COM
  Common Stock     5,753  
   
COMPASS MINERALS INTERNATION COM
  Common Stock     2,324  
   
COMPUTER SCIENCES CORP COM
  Common Stock     34,248  
   
COMSTOCK RES INC COM NEW
  Common Stock     3,256  
   
CON-WAY INC COM
  Common Stock     8,247  
   
CONAGRA FOODS INC COM
  Common Stock     15,554  
   
CONOCOPHILLIPS COM
  Common Stock     328,016  
   
CONSECO INC COM
  Common Stock     14,916  
   
CONSOL ENERGY INC COM
  Common Stock     12,617  
   
CONSOLIDATED EDISON INC COM
  Common Stock     43,131  
   
CONSTELLATION BRANDS INC CL A
  Common Stock     5,174  
   
CONSTELLATION ENERGY GROUP INC COM
  Common Stock     28,917  
   
CONTINENTAL RESOURCES INC COM
  Common Stock     7,422  
   
CONVERGYS CORP COM
  Common Stock     3,080  
   
COOPER INDUSTRIES PLC-CL A COM
  Common Stock     9,320  
   
CORE MARK HOLDING CO INC COM
  Common Stock     6,401  
   
CORN PRODS INTL INC COM
  Common Stock     3,945  
   
CORNING INC COM
  Common Stock     16,732  
   
COSTCO WHOLESALE CORP COM
  Common Stock     60,742  
   
COVANTA HOLDING CORP COM
  Common Stock     2,386  
   
COVENTRY HLTH CARE INC COM
  Common Stock     13,681  
   
COVIDIEN PLC COM
  Common Stock     24,934  
   
CRACKER BARREL OLD COUNTRY COM
  Common Stock     2,355  
   
CRANE CO COM
  Common Stock     5,961  
   
CREDICORP LTD COM
  Common Stock     9,316  
   
CROSSTEX ENERGY INC COM
  Common Stock     4,223  
   
CROWN HOLDINGS INC COM
  Common Stock     7,876  
   
CSX CORP COM
  Common Stock     26,350  
   
CULLEN FROST BANKERS INC COM
  Common Stock     5,662  
   
CUMMINS INC COM
  Common Stock     24,497  
   
CURTIS-WRIGHT CORP COM
  Common Stock     2,221  
   
CVR ENERGY INC COM
  Common Stock     2,467  
   
CVS CAREMARK CORP COM
  Common Stock     39,147  
   
CYTEC INDS INC COM
  Common Stock     7,205  
   
D R HORTON INC COM
  Common Stock     24,593  
   
DANAHER CORP COM
  Common Stock     16,221  

25


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
DARDEN RESTAURANTS INC COM
  Common Stock     4,973  
   
DAVITA INC COM
  Common Stock     4,591  
   
DEAN FOODS CO COM
  Common Stock     27,348  
   
DEERE & CO COM
  Common Stock     21,642  
   
DELEK US HOLDINGS INC COM
  Common Stock     1,442  
   
DELL INC COM
  Common Stock     46,368  
   
DELMONTE FOODS CO COM
  Common Stock     3,419  
   
DELTA AIRLINES INC DEL COM
  Common Stock     22,569  
   
DELUXE CORP COM
  Common Stock     2,002  
   
DENTSPLY INTERNATIONAL INC COM
  Common Stock     2,552  
   
DEVELOPERS DIVERSIFIED RLTY CORP COM
  Common Stock     4,912  
   
DEVON ENERGY CORPORATION COM
  Common Stock     57,134  
   
DIAMOND OFFSHORE DRILLING INC COM
  Common Stock     6,225  
   
DICKS SPORTING GOODS INC COM
  Common Stock     5,117  
   
DIEBOLD INC COM
  Common Stock     5,541  
   
DILLARDS INC CL A COM
  Common Stock     15,928  
   
DIRECTV CLASS A COM
  Common Stock     31,025  
   
DISCOVER FINANCIAL SERVICES COM
  Common Stock     21,609  
   
DISCOVERY COMMUNICATIONS A COM
  Common Stock     7,943  
   
DISH NETWORK CORP CL A COM
  Common Stock     18,740  
   
DISNEY COMPANY HOLDING COMPANY COM
  Common Stock     67,933  
   
DOLLAR TREE INC COM
  Common Stock     3,213  
   
DOMINION RESOURCES INC COM
  Common Stock     19,030  
   
DOMINOS PIZZA INC COM
  Common Stock     4,159  
   
DONALDSON CO INC. COM
  Common Stock     3,384  
   
DONNELLEY R R & SONS CO COM
  Common Stock     30,113  
   
DORCHESTER MINERALS LP COM
  Common Stock     2,670  
   
DOVER CORP COM
  Common Stock     10,706  
   
DOW CHEMICAL COM
  Common Stock     136,069  
   
DPL INC COM
  Common Stock     3,159  
   
DR PEPPER SNAPPLE GROUP COM
  Common Stock     10,186  
   
DRESS BARN INC COM
  Common Stock     4,507  
   
DRESSER RAND GROUP INC COM
  Common Stock     2,815  
   
DST SYS INC DEL COM
  Common Stock     4,224  
   
DSW INC CLASS A COM
  Common Stock     1,626  
   
DTE ENERGY CO COM
  Common Stock     22,791  
   
DU PONT E I DE NEMOURS & CO COM
  Common Stock     49,939  
   
DUKE ENERGY CORP COM
  Common Stock     49,701  
   
DUKE RLTY INVTS INC COM
  Common Stock     4,907  
   
DUN & BRADSTREET CORP COM
  Common Stock     3,213  
   
DYNEGY INC COM CL A
  Common Stock     3,539  
   
E M C CORP MASS COM
  Common Stock     41,108  
   
EASTMAN CHEMICAL COMPANY COM
  Common Stock     13,488  
   
EASTMAN KODAK CO COM
  Common Stock     10,422  
   
EATON CORP COM
  Common Stock     15,943  
   
EBAY INC COM
  Common Stock     21,549  

26


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
ECOLAB INC COM
  Common Stock     7,936  
   
EDISON INTL COM
  Common Stock     45,318  
   
EDWARDS LIFESCIENCES CORP COM
  Common Stock     3,335  
   
EL PASO CORP COM
  Common Stock     10,993  
   
EL PASO ELEC CO COM
  Common Stock     4,150  
   
ELECTRONIC ARTS COM
  Common Stock     6,881  
   
EMCOR GRP INC COM
  Common Stock     6,620  
   
EMERGENCY MEDICAL SERVICES COM
  Common Stock     3,627  
   
EMERSON ELECTRIC CO COM
  Common Stock     40,247  
   
ENBRIDGE ENERGY PARTNERS LP
  Common Stock     8,804  
   
ENDO PHARMACEUTICALS HLDGS INC COM
  Common Stock     3,207  
   
ENDURANCE SPECIALTY HOLDINGS LTD COM
  Common Stock     9,240  
   
ENERGY TRANSFER EQUITY LP
  Common Stock     6,798  
   
ENERGY TRANSFER PARTNERS LP
  Common Stock     10,875  
   
ENERGYSOLUTIONS INC COM
  Common Stock     1,610  
   
ENERSYS INC COM
  Common Stock     2,453  
   
ENSCO INTL PLC COM
  Common Stock     6,051  
   
ENTERGY CORP COM
  Common Stock     20,898  
   
ENTERPRISE GP HOLDINGS LP
  Common Stock     16,535  
   
ENTERPRISE PRODUCTS PARTNERS LP COM
  Common Stock     48,209  
   
EOG RES INC COM
  Common Stock     11,714  
   
EQT CORP COM
  Common Stock     4,266  
   
EQUIFAX INC COM
  Common Stock     4,347  
   
ERIE INDTY CO CL A
  Common Stock     5,066  
   
ESTERLINE CORPORATION COM
  Common Stock     3,136  
   
ETHAN ALLEN INTERIORS INC COM
  Common Stock     2,573  
   
EVEREST RE GROUP LTD COM
  Common Stock     14,964  
   
EXCO RESOURCES INC COM
  Common Stock     4,543  
   
EXELON CORP COM
  Common Stock     69,344  
   
EXIDE TECHNOLOGIES COM
  Common Stock     3,458  
   
EXPEDIA INC COM
  Common Stock     16,042  
   
EXPEDITORS INTL WASH INC COM
  Common Stock     7,141  
   
EXPRESS SCRIPTS INC CL A COM
  Common Stock     13,813  
   
EXTERRAN HOLDINGS INC COM
  Common Stock     4,678  
   
EXXON MOBIL CORP COM
  Common Stock     782,091  
   
FAIRCHILD SEMICON INTL COM
  Common Stock     4,675  
   
FAMILY DOLLAR STORES INC COM
  Common Stock     7,224  
   
FEDERAL MOGUL CORP COM
  Common Stock     9,449  
   
FEDERATED INVS INC PA CL B
  Common Stock     4,169  
   
FEDEX CORP COM
  Common Stock     41,983  
   
FERRO CORP COM
  Common Stock     4,904  
   
FIDELITY NATIONAL FINANCIAL COM
  Common Stock     16,238  
   
FIDELITY NATIONAL INFORMATION COM
  Common Stock     4,395  
   
FIFTH THIRD BANCORP COM
  Common Stock     54,451  
   
FIRST AMERN CORP CALIF COM
  Common Stock     10,811  
   
FIRST CITIZENS BANCSHARES INC CL A
  Common Stock     7,401  

27


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
FIRST COMWLTH FINL CORP PA COM
  Common Stock     1,161  
   
FIRST HORIZON NATIONAL CORP COM
  Common Stock     7,325  
   
FIRST MIDWEST BANCORP INC DEL COM
  Common Stock     3,080  
   
FIRST NIAGARA FINL GROUP INC NEW COM
  Common Stock     3,208  
   
FIRST SOLAR INC COM
  Common Stock     1,762  
   
FIRSTENERGY CORP COM
  Common Stock     20,717  
   
FISERV INC WIS COM
  Common Stock     4,064  
   
FLIR SYS INC COM
  Common Stock     1,891  
   
FLOWSERVE CORP COM
  Common Stock     16,722  
   
FLUOR CORP COM
  Common Stock     24,978  
   
FMC CORP COM
  Common Stock     3,170  
   
FMC TECHNOLOGIES INC COM
  Common Stock     6,346  
   
FOOT LOCKER INC COM
  Common Stock     8,363  
   
FORD MTR CO COM
  Common Stock     255,045  
   
FOREST LABS CL A
  Common Stock     2,792  
   
FOREST OIL CORP COM
  Common Stock     5,940  
   
FORTRESS INVESTMENT GROUP LLC CL A COM
  Common Stock     13,256  
   
FORTUNE BRANDS INC COM
  Common Stock     13,039  
   
FOSSIL INC COM
  Common Stock     3,616  
   
FOSTER WHEELER AG
  Common Stock     5,941  
   
FPL GROUP INC COM
  Common Stock     26,268  
   
FRANKLIN RES INC COM
  Common Stock     37,853  
   
FREEPORT MCMORAN COPPER & GOLD CL B COM
  Common Stock     59,926  
   
FRONTIER COMMUNICATIONS CORP COM
  Common Stock     8,028  
   
FRONTIER OIL CORP COM
  Common Stock     5,393  
   
FRONTLINE LTD COM
  Common Stock     5,453  
   
FULLER H B CO COM
  Common Stock     3,210  
   
FULTON FINANCIAL CORP COM
  Common Stock     5,732  
   
GAMESTOP CORP CL A COM
  Common Stock     2,749  
   
GANNETT CO COM
  Common Stock     73,387  
   
GAP INC COM
  Common Stock     33,830  
   
GARMIN LTD COM
  Common Stock     11,993  
   
GATX CORP COM
  Common Stock     3,879  
   
GENERAL CABLE CORP DEL COM
  Common Stock     4,566  
   
GENERAL DYNAMICS CORP COM
  Common Stock     34,481  
   
GENERAL ELECTRIC CO COM
  Common Stock     216,191  
   
GENERAL MILLS INC COM
  Common Stock     19,999  
   
GENUINE PARTS CO COM
  Common Stock     18,678  
   
GENWORTH FINANCIAL INC COM
  Common Stock     96,081  
   
GENZYME CORP COM
  Common Stock     5,280  
   
GILEAD SCIENCES INC COM
  Common Stock     5,173  
   
GLOBAL PMTS INC COM
  Common Stock     3,741  
   
GOLDMAN SACHS GROUP INC COM
  Common Stock     146,887  
   
GOODRICH CORP COM
  Common Stock     16,342  

28


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
GOODYEAR TIRE & RUBBER CO COM
  Common Stock     17,774  
   
GOOGLE INC CL A COM
  Common Stock     46,455  
   
GRACE W R & CO DEL NEW COM
  Common Stock     7,823  
   
GRACO INC COM
  Common Stock     2,560  
   
GRANITE CONSTR INC COM
  Common Stock     3,308  
   
GREAT ATLANTIC & PAC TEA INC COM
  Common Stock     23,772  
   
GREAT PLAINS ENERGY INC COM
  Common Stock     4,193  
   
GREIF BROS CORP A
  Common Stock     4,317  
   
GROUP 1 AUTOMOTIVE INC COM
  Common Stock     3,039  
   
GUESS INC COM
  Common Stock     6,445  
   
H&E EQUIPMENT SERVICES INC COM
  Common Stock     3,288  
   
HALLIBURTON CO COM
  Common Stock     22,941  
   
HANESBRANDS INC COM
  Common Stock     5,381  
   
HANOVER INSURANCE GROUP COM
  Common Stock     7,780  
   
HARLEY DAVIDSON INC COM
  Common Stock     6,640  
   
HARLEYSVILLE GRP INC
  Common Stock     4,786  
   
HARMAN INTL INDS INC COM
  Common Stock     5,389  
   
HARRIS CORP DEL COM
  Common Stock     5,866  
   
HARRIS STRATEX NETWORKS INC COM
  Common Stock     323  
   
HARSCO CORP COM
  Common Stock     5,405  
   
HARTE-HANKS INC COM
  Common Stock     3,003  
   
HARTFORD FINANCIAL SERVICES GRP COM
  Common Stock     71,353  
   
HASBRO INC COM
  Common Stock     5,072  
   
HATTERAS FINANCIAL CORP
  Common Stock     1,730  
   
HAWAIIAN ELEC INDS INC COM
  Common Stock     16,802  
   
HCC INS HLDGS INC COM
  Common Stock     6,781  
   
HEALTH CARE REIT INC COM
  Common Stock     1,879  
   
HEALTH MGMT ASSOC INC NEW CL A
  Common Stock     4,461  
   
HEALTH NET INC COM
  Common Stock     19,674  
   
HEARTLAND EXPRESS INC COM
  Common Stock     3,586  
   
HEINZ H J CO COM
  Common Stock     7,889  
   
HELIX ENERGY SOLUTIONS GROUP COM
  Common Stock     4,551  
   
HENRY JACK & ASSOC INC COM
  Common Stock     2,534  
   
HERBALIFE LTD COM
  Common Stock     6,283  
   
HERSHEY COMPANY COM
  Common Stock     7,785  
   
HERTZ GLOBAL HOLDINGS INC COM
  Common Stock     13,337  
   
HESS CORP COM
  Common Stock     68,527  
   
HEWITT ASSOC INC CL A
  Common Stock     4,844  
   
HEWLETT-PACKARD CO COM
  Common Stock     213,224  
   
HILL-ROM HOLDINGS INC COM
  Common Stock     8,541  
   
HITTITE MICROWAVE CORP COM
  Common Stock     2,792  
   
HNI CORP COM
  Common Stock     6,095  
   
HOLLY CORP COM
  Common Stock     3,833  
   
HOME DEPOT INC COM
  Common Stock     76,629  
   
HONEYWELL INTL INC COM
  Common Stock     63,848  
   
HORMEL FOODS CORP COM
  Common Stock     6,135  

29


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
HOSPIRA INC COM
  Common Stock     5,110  
   
HOSPITALITY PPTYS TR SH BEN INT
  Common Stock     2,971  
   
HOST MARRIOTT CORP COM
  Common Stock     7,788  
   
HSN INC COM
  Common Stock     8,360  
   
HUBBELL INC CL B COM
  Common Stock     2,979  
   
HUDSON CITY BANCORP INC COM
  Common Stock     4,409  
   
HUMANA INC COM
  Common Stock     27,748  
   
HUNT J B TRANS SVCS INC COM
  Common Stock     5,619  
   
HUNTINGTON BANCSHARES INC COM
  Common Stock     19,321  
   
HUNTSMAN CORPORATION COM
  Common Stock     15,677  
   
IAC / INTERACTIVECORP COM
  Common Stock     13,094  
   
IDACORP INC COM
  Common Stock     3,862  
   
ILLINOIS TOOL WORKS INC COM
  Common Stock     16,386  
   
IMATION CORP COM
  Common Stock     2,315  
   
IMS HEALTH INC COM
  Common Stock     5,502  
   
INERGY HOLDINGS LP
  Common Stock     2,720  
   
INGERSOLL-RAND PLC COM
  Common Stock     7,355  
   
INGRAM MICRO INC CL A
  Common Stock     29,407  
   
INSIGHT ENTERPRISES INC COM
  Common Stock     6,687  
   
INTEGRATED DEVICE TECHNOLOGY INC COM
  Common Stock     2,438  
   
INTEGRYS ENERGY GROUP INC COM
  Common Stock     9,852  
   
INTEL CORP COM
  Common Stock     119,229  
   
INTERACTIVE BROKER GRD CL A COM
  Common Stock     4,295  
   
INTERACTIVE DATA CORP COM
  Common Stock     3,580  
   
INTERNATIONAL PAPER CO COM
  Common Stock     33,317  
   
INTERPUBLIC GRP COS INC COM
  Common Stock     9,511  
   
INTERSIL HLDG CORP COM
  Common Stock     3,199  
   
INTL BUSINESS MACHINES CORP COM
  Common Stock     163,890  
   
INTL FLAVORS & FRAGRANCES INC COM
  Common Stock     5,764  
   
INTL GAME TECHNOLOGY COM
  Common Stock     4,969  
   
INTUIT COM
  Common Stock     4,644  
   
INVESCO LTD
  Common Stock     15,568  
   
IRON MTN INC PA COM
  Common Stock     1,975  
   
ITRON INC COM
  Common Stock     2,394  
   
ITT CORP COM
  Common Stock     15,557  
   
JABIL CIRCUIT INC COM
  Common Stock     17,990  
   
JACK IN THE BOX INC COM
  Common Stock     1,674  
   
JACOBS ENGR GRP INC COM
  Common Stock     7,429  
   
JANUS CAPITAL GROUP INC COM
  Common Stock     2,569  
   
JARDEN CORP COM
  Common Stock     3,567  
   
JEFFERIES GROUP INC COM
  Common Stock     1,960  
   
JOHNSON & JOHNSON COM
  Common Stock     272,228  
   
JOHNSON CTLS INC COM
  Common Stock     37,946  
   
JONES APPAREL GRP INC COM
  Common Stock     8,651  
   
JONES LANG LASALLE INC COM
  Common Stock     3,633  
   
JOY GLOBAL INC COM
  Common Stock     9,105  

30


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
JP MORGAN CHASE & CO COM
  Common Stock     343,413  
   
JUNIPER NETWORKS INC COM
  Common Stock     9,122  
   
KB HOME COM
  Common Stock     5,699  
   
KBR INC COM
  Common Stock     11,542  
   
KELLOGG COMPANY COM
  Common Stock     19,973  
   
KELLY SVCS INC CL A
  Common Stock     5,749  
   
KENNAMETAL INC COM
  Common Stock     4,843  
   
KEY ENERGY SVCS INC COM
  Common Stock     2,724  
   
KEYCORP NEW COM
  Common Stock     26,249  
   
KIMBERLY-CLARK CORP COM
  Common Stock     34,653  
   
KIMCO RLTY CORP COM
  Common Stock     6,177  
   
KINDER MORGAN ENERGY PARTNERS LP
  Common Stock     21,242  
   
KINDRED HEALTHCARE INC COM
  Common Stock     6,458  
   
KING PHARMACEUTICALS INC COM
  Common Stock     3,238  
   
KIRBY CORP COM
  Common Stock     2,017  
   
KLA TENCOR CORP COM
  Common Stock     1,997  
   
KNIGHT CAPITAL GROUP INC COM
  Common Stock     1,963  
   
KOHLS CORP COM
  Common Stock     9,390  
   
KORN/FERRY INTERNATIONAL COM
  Common Stock     3,388  
   
KRAFT FOODS INC CL A COM
  Common Stock     85,424  
   
KROGER CO COM
  Common Stock     38,734  
   
L-3 COMMUNICATIONS HLDGS INC COM
  Common Stock     10,985  
   
LABORATORY CORP AMER HLDGS COM
  Common Stock     3,860  
   
LACLEDE GROUP,INC COM
  Common Stock     2,213  
   
LAM RESEARCH CORP COM
  Common Stock     3,648  
   
LAMAR ADVERTISING CO CL A
  Common Stock     6,843  
   
LANCASTER COLONY CORP COM
  Common Stock     2,468  
   
LANDSTAR SYS INC COM
  Common Stock     2,950  
   
LAS VEGAS SANDS CORP COM
  Common Stock     5,596  
   
LAUDER ESTEE COS INC CL A
  Common Stock     12,503  
   
LEGG MASON INC COM
  Common Stock     5,882  
   
LEGGETT & PLATT INC COM
  Common Stock     8,458  
   
LENNAR CORP COM CL A
  Common Stock     16,024  
   
LENNOX INTERNATIONAL INC COM
  Common Stock     5,691  
   
LEXMARK INTL INC CL A COM
  Common Stock     9,195  
   
LIBERTY GLOBAL INC CL A COM
  Common Stock     8,224  
   
LIBERTY MEDIA — INTERACTIVE CL A COM
  Common Stock     18,073  
   
LIBERTY MEDIA COM
  Common Stock     1,345  
   
LIBERTY PPTY TR SH BEN INT
  Common Stock     4,003  
   
LILLY ELI & CO COM
  Common Stock     55,852  
   
LIMITED BRANDS INC COM
  Common Stock     33,426  
   
LINCARE HLDGS INC COM
  Common Stock     4,520  
   
LINCOLN ELEC HLDS INC COM
  Common Stock     10,278  
   
LINCOLN NATIONAL CORP COM
  Common Stock     42,092  
   
LINN ENERGY LLC
  Common Stock     6,681  
   
LOCKHEED MARTIN CORP COM
  Common Stock     42,700  

31


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
LOEWS CORP — CAROLINA GROUP COM
  Common Stock     48,525  
   
LORILLARD INC COM
  Common Stock     30,712  
   
LOWE’S COS INC COM
  Common Stock     44,694  
   
LUBRIZOL CORP COM
  Common Stock     6,722  
   
M & T BK CORP COM
  Common Stock     18,111  
   
MACK CALI RLTY CORP COM
  Common Stock     3,181  
   
MACY’S INC COM
  Common Stock     44,531  
   
MAGELLAN HEALTH SVCS INC COM
  Common Stock     3,814  
   
MANPOWER INC WIS COM
  Common Stock     30,260  
   
MARATHON OIL CORP COM
  Common Stock     58,268  
   
MARINER ENERGY INC COM
  Common Stock     3,140  
   
MARRIOTT INTERNATIONAL CL A COM
  Common Stock     13,501  
   
MARSH & MCLENNAN COMPANIES INC COM
  Common Stock     21,585  
   
MARSHALL & ILSLEY CORP COM
  Common Stock     14,894  
   
MARVELL TECHNOLOGY GROUP LTD COM
  Common Stock     6,524  
   
MASCO CORP COM
  Common Stock     32,615  
   
MASSEY ENERGY CO COM
  Common Stock     7,661  
   
MASTERCARD INC CL A COM
  Common Stock     14,727  
   
MATTEL INC COM
  Common Stock     19,361  
   
MAXIM INTEGRATED PRODS INC COM
  Common Stock     9,694  
   
MCAFEE INC COM
  Common Stock     3,351  
   
MCDERMOTT INTL INC COM
  Common Stock     8,463  
   
MCDONALDS CORP COM
  Common Stock     51,063  
   
MCGRAW HILL COS INC
  Common Stock     22,290  
   
MCKESSON CORP COM
  Common Stock     64,441  
   
MDU RES GRP INC COM
  Common Stock     4,512  
   
MEAD JOHNSON NUTRITION CO COM
  Common Stock     4,413  
   
MEADWESTVACO CORP COM
  Common Stock     12,987  
   
MEDCO HEALTH SOLUTIONS INC COM
  Common Stock     43,257  
   
MEDTRONIC INC COM
  Common Stock     22,809  
   
MEMC ELECTRONIC MATERIALS INC COM
  Common Stock     5,084  
   
MENS WEARHOUSE INC COM
  Common Stock     3,190  
   
MERCK & CO INC COM
  Common Stock     160,754  
   
MERCURY GEN CORP COM
  Common Stock     12,338  
   
MEREDITH CORP COM
  Common Stock     4,881  
   
METLIFE INC COM
  Common Stock     76,218  
   
METROPCS COMMUNICATIONS INC COM
  Common Stock     1,889  
   
METTLER-TOLEDO INTL INC COM
  Common Stock     8,792  
   
MF GLOBAL LTD COM
  Common Stock     4,507  
   
MGM MIRAGE COM
  Common Stock     7,886  
   
MICROCHIP TECHNOLOGY INC COM
  Common Stock     5,833  
   
MICRON TECHNOLOGY INC COM
  Common Stock     12,975  
   
MICROSOFT CORP COM
  Common Stock     490,375  
   
MINERALS TECHNOLOGIES INC COM
  Common Stock     2,850  
   
MIRANT CORP COM
  Common Stock     10,899  
   
MODINE MFG CO COM
  Common Stock     8,276  

32


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
MOHAWK INDS INC COM
  Common Stock     7,843  
   
MOLEX INC COM
  Common Stock     4,263  
   
MOLINA HEALTHCARE INC COM
  Common Stock     2,583  
   
MOLSON COORS BREWING CO COM
  Common Stock     11,938  
   
MONSANTO CO COM
  Common Stock     12,677  
   
MONTPELIER RE HOLDINGS LTD COM
  Common Stock     13,841  
   
MOODY’S CORPORATION COM
  Common Stock     2,386  
   
MOOG INC CLASS A COM
  Common Stock     2,342  
   
MORGAN STANLEY COM
  Common Stock     112,570  
   
MOSAIC CO COM
  Common Stock     13,368  
   
MOTOROLA INC COM
  Common Stock     83,281  
   
MSC INDL DIRECT INC CL A
  Common Stock     3,768  
   
MSCI INC COM
  Common Stock     12,976  
   
MUELLER INDS INC COM
  Common Stock     5,458  
   
MUELLER WATER PRODUCTS INC COM CL A
  Common Stock     3,776  
   
MURPHY OIL CORP COM
  Common Stock     16,108  
   
MYLAN LABS INC COM
  Common Stock     2,996  
   
NABORS INDUSTRIES LTD COM
  Common Stock     8,676  
   
NALCO HOLDING CO COM
  Common Stock     7,083  
   
NASH FINCH CO COM
  Common Stock     3,824  
   
NATIONAL FINANCIAL PARTNERS COM
  Common Stock     2,457  
   
NATIONAL FUEL GAS CO NJ COM
  Common Stock     6,121  
   
NATIONAL OILWELL VARCO INC COM
  Common Stock     11,796  
   
NATIONAL PENN BANCSHARES INC COM
  Common Stock     1,421  
   
NATIONAL SEMICONDUCTOR CORP COM
  Common Stock     5,227  
   
NATIONWIDE HLTH PPTYS INC COM
  Common Stock     1,583  
   
NATL INSTRS CORP COM
  Common Stock     5,232  
   
NAVIGATORS GROUP INC COM
  Common Stock     2,792  
   
NAVISTAR INTL CORP COM
  Common Stock     4,804  
   
NCI BLDG SYS INC COM
  Common Stock     773  
   
NCR CORPORATION COM
  Common Stock     6,721  
   
NETAPP INC COM
  Common Stock     8,530  
   
NEW JERSEY RES CORP COM
  Common Stock     4,769  
   
NEW YORK CMNTY BANCORP INC COM
  Common Stock     4,822  
   
NEW YORK TIMES CO CL A COM
  Common Stock     13,307  
   
NEWELL RUBBERMAID INC COM
  Common Stock     8,401  
   
NEWFIELD EXPL CO COM
  Common Stock     6,736  
   
NEWMONT MNG CORP COM
  Common Stock     6,782  
   
NEWS CORP INC CLASS A COM
  Common Stock     89,590  
   
NICOR INC COM
  Common Stock     8,524  
   
NII HLDGS INC CL B
  Common Stock     13,139  
   
NIKE INC CL B COM
  Common Stock     22,313  
   
NISOURCE INC COM
  Common Stock     8,300  
   
NOBLE CORP COM
  Common Stock     6,139  
   
NOBLE ENERGY INC COM
  Common Stock     10,572  
   
NORDSON CORP COM
  Common Stock     3,093  

33


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
NORDSTROM INC COM
  Common Stock     11,901  
   
NORFOLK SOUTHERN CORP COM
  Common Stock     27,343  
   
NORTHEAST UTILS COM
  Common Stock     6,240  
   
NORTHERN TRUST CORP COM
  Common Stock     15,995  
   
NORTHROP GRUMMAN CORP COM
  Common Stock     66,787  
   
NORTHWEST NAT GAS CO COM
  Common Stock     2,310  
   
NORTHWESTERN CORP COM
  Common Stock     2,890  
   
NRG ENERGY INC COM
  Common Stock     7,900  
   
NSTAR COM
  Common Stock     7,760  
   
NU SKIN ENTERPRISES INC CL A
  Common Stock     7,160  
   
NUCOR CORP COM
  Common Stock     14,693  
   
NUSTAR ENERGY LP
  Common Stock     4,499  
   
NV ENERGY INC COM
  Common Stock     4,611  
   
NVR INC COM
  Common Stock     10,607  
   
NYSE EURONEXT COM
  Common Stock     11,021  
   
OCCIDENTAL PETE CORP COM
  Common Stock     62,232  
   
OCEANEERING INTL INC COMMON
  Common Stock     3,012  
   
OCH-ZIFF CAPITAL MANAGEMENT COM
  Common Stock     15,803  
   
OFFICE DEPOT INC COM
  Common Stock     33,857  
   
OFFICEMAX INC COM
  Common Stock     14,467  
   
OGE ENERGY CORP COM
  Common Stock     5,022  
   
OLD NATL BANCORP IND COM
  Common Stock     2,428  
   
OLD REP INTL CORP COM
  Common Stock     10,322  
   
OLIN CORP COM
  Common Stock     5,098  
   
OM GRP INC COM
  Common Stock     2,432  
   
OMNICARE INC COM
  Common Stock     3,887  
   
OMNICOM GROUP INC COM
  Common Stock     25,009  
   
ONEOK INC COM
  Common Stock     7,390  
   
ONEOK PARTNERS LP
  Common Stock     8,258  
   
ORACLE CORP COM
  Common Stock     59,024  
   
OSHKOSH CORP CL B COM
  Common Stock     11,256  
   
OTTER TAIL PWR CO COM
  Common Stock     2,049  
   
OVERSEAS SHIPHLDG GP INC COM
  Common Stock     4,860  
   
OWENS & MINOR INC COM
  Common Stock     2,759  
   
OWENS CORNING INC COM
  Common Stock     7,238  
   
OWENS ILLINOIS INC COM
  Common Stock     19,095  
   
PACCAR INC COM
  Common Stock     24,579  
   
PACIFIC CAPITAL BANCORP COM
  Common Stock     363  
   
PACKAGING CORP AMER COM
  Common Stock     5,016  
   
PACTIV CORP COM
  Common Stock     5,032  
   
PALL CORP COM
  Common Stock     6,812  
   
PANTRY INC COM
  Common Stock     1,977  
   
PARK NATL CORP COM
  Common Stock     2,339  
   
PARKER HANNIFIN CORP COM
  Common Stock     10,511  
   
PARTNERRE LTD COM
  Common Stock     7,974  
   
PATTERSON COS INC COM
  Common Stock     2,333  

34


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
PATTERSON-UTI ENERGY INC COM
  Common Stock     3,946  
   
PAYCHEX INC COM
  Common Stock     12,539  
   
PDL BIOPHARMA INC COM
  Common Stock     9,887  
   
PEABODY ENERGY CORP COM
  Common Stock     10,335  
   
PENN NATL GAMING INC COM
  Common Stock     3,136  
   
PENNEY J C INC COM
  Common Stock     21,948  
   
PENSKE AUTO GROUP INC COM
  Common Stock     4,425  
   
PENTAIR INC COM
  Common Stock     3,654  
   
PEOPLE’S UNITED FINANCIAL INC COM
  Common Stock     5,601  
   
PEPCO HOLDINGS INC COM
  Common Stock     12,654  
   
PEPSI BOTTLING GRP INC COM
  Common Stock     8,436  
   
PEPSIAMERICAS INC COM
  Common Stock     3,474  
   
PEPSICO INC COM
  Common Stock     106,253  
   
PERKINELMER INC COM
  Common Stock     3,368  
   
PERRIGO CO COM
  Common Stock     2,631  
   
PETSMART INC COM
  Common Stock     4,598  
   
PFIZER INC COM
  Common Stock     264,628  
   
PG&E CORP COM
  Common Stock     33,284  
   
PHARMACEUTICAL PROD DEV INC COM
  Common Stock     4,919  
   
PHILIP MORRIS INTL INC COM
  Common Stock     116,996  
   
PHILLIPS VAN HEUSEN CORP COM
  Common Stock     4,425  
   
PIEDMONT NATURAL GAS INC COM
  Common Stock     3,857  
   
PINNACLE WEST CAP CORP COM
  Common Stock     8,614  
   
PIONEER NATURAL RESOURCES CO COM
  Common Stock     9,310  
   
PITNEY BOWES INC COM
  Common Stock     12,406  
   
PLAINS ALL AMER PIPELINE LP COM
  Common Stock     11,720  
   
PLAINS EXPLORATION & PRODUCT COM
  Common Stock     10,503  
   
PLANTRONICS INC COM
  Common Stock     4,648  
   
PLATINUM UNDERWRITERS HOLDINGS LTD COM
  Common Stock     5,848  
   
PLUM CREEK TIMBER CO INC COM
  Common Stock     2,718  
   
PNC FINANCIAL SERVICES GROUP INC COM
  Common Stock     21,927  
   
POLARIS INDS INC COM
  Common Stock     4,426  
   
POLO RALPH LAUREN CORP CL A
  Common Stock     5,769  
   
POOL CORP COM
  Common Stock     2,135  
   
PORTLAND GEN ELEC CO COM
  Common Stock     2,398  
   
POTLATCH CORP COM
  Common Stock     2,777  
   
PPG INDUSTRIES INC COM
  Common Stock     26,949  
   
PPL CORP COM
  Common Stock     13,954  
   
PRAXAIR INC COM
  Common Stock     13,195  
   
PRECISION CASTPARTS CORP COM
  Common Stock     5,741  
   
PRIDE INTERNATIONAL INC COM
  Common Stock     4,929  
   
PRINCIPAL FINANCIAL GROUP COM
  Common Stock     21,822  
   
PROASSURANCE CORP COM
  Common Stock     3,325  
   
PROCTER & GAMBLE CO COM
  Common Stock     114,477  
   
PROGRESS ENERGY INC COM
  Common Stock     17,305  

35


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
PROGRESSIVE CORP OHIO COM
  Common Stock     30,779  
   
PROLOGIS TR SH BEN INT
  Common Stock     8,891  
   
PROTECTIVE LIFE CORP COM
  Common Stock     11,540  
   
PRUDENTIAL FINANCIAL INC COM
  Common Stock     80,677  
   
PUBLIC SERVICE ENTERPRISE GROUP INC COM
  Common Stock     31,580  
   
PUBLIC STORAGE INC COM
  Common Stock     9,832  
   
PULTE HOME INC COM
  Common Stock     7,507  
   
QUALCOMM INC COM
  Common Stock     20,153  
   
QUANTA SVCS INC COM
  Common Stock     3,893  
   
QUEST DIAGNOSTICS INC COM
  Common Stock     7,270  
   
QUESTAR CORP COM
  Common Stock     6,856  
   
QWEST COMMUNICATIONS INTL INC COM
  Common Stock     39,843  
   
RADIOSHACK CORP COM
  Common Stock     9,954  
   
RAYMOND JAMES FINANCIAL INC COM
  Common Stock     7,563  
   
RAYONIER INC RAYONIER INC
  Common Stock     2,430  
   
RAYTHEON CO COM
  Common Stock     52,931  
   
REALTY INCOME CORP COM
  Common Stock     4,137  
   
REDWOOD TR INC COM
  Common Stock     4,316  
   
REGAL BELOIT CORP COM
  Common Stock     3,104  
   
REGAL ENTERTAINMENT GROUP COM
  Common Stock     6,232  
   
REGIONS FINANCIAL CORP COM
  Common Stock     48,353  
   
REGIS CORP MINN COM
  Common Stock     1,838  
   
REINSURANCE GRP AMER INC COM
  Common Stock     12,411  
   
RELIANCE STL & ALUM CO COM
  Common Stock     4,905  
   
RENAISSANCERE HOLDINGS LTD COM
  Common Stock     6,894  
   
RENT-A-CENTER INC COM
  Common Stock     3,702  
   
REPUBLIC SVCS INC COM
  Common Stock     4,527  
   
RESMED INC COM
  Common Stock     4,086  
   
RESOURCES CONNECTION INC COM
  Common Stock     2,936  
   
REYNOLDS AMERICAN INC COM
  Common Stock     45,995  
   
ROBERT HALF INTL INC COM
  Common Stock     8,069  
   
ROCKWELL AUTOMATION INC COM
  Common Stock     18,020  
   
ROCKWELL COLLINS COM
  Common Stock     12,243  
   
ROCKWOOD HOLDINGS INC COM
  Common Stock     4,262  
   
ROSS STORES INC COM
  Common Stock     6,871  
   
ROWAN COS INC COM
  Common Stock     3,853  
   
ROYAL CARIBBEAN CRUISES LTD COM
  Common Stock     13,184  
   
RPM INTL INC COM
  Common Stock     5,238  
   
RSC HOLDINGS INC COM
  Common Stock     2,429  
   
RTI INTERNATIONAL METALS COM
  Common Stock     2,803  
   
RUDDICK CORP COM
  Common Stock     3,412  
   
RYDER SYS INC COM
  Common Stock     8,505  
   
RYLAND GRP INC COM
  Common Stock     3,973  
   
SAFETY INSURANCE GROUP INC COM
  Common Stock     3,700  
   
SAFEWAY INC COM
  Common Stock     37,409  
   
SAIC INC COM
  Common Stock     9,439  

36


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
SAKS INC COM
  Common Stock     8,168  
   
SANDISK CORP COM
  Common Stock     10,670  
   
SARA LEE CORP COM
  Common Stock     29,705  
   
SAUER-DANFOSS INC COM
  Common Stock     6,075  
   
SCANA CORP W-I COM
  Common Stock     6,528  
   
SCHEIN HENRY INC COM
  Common Stock     5,692  
   
SCHLUMBERGER LTD COM
  Common Stock     41,728  
   
SCHOLASTIC CORP COM
  Common Stock     4,124  
   
SCHWAB CHARLES CORP COM
  Common Stock     24,191  
   
SCRIPPS NETWORKS INTER CL A COM
  Common Stock     3,883  
   
SEACOR HLDGS INC SEACOR HOLDING INC
  Common Stock     3,636  
   
SEAGATE TECHNOLOGY COM
  Common Stock     24,809  
   
SEAHAWK DRILLING INC COM
  Common Stock     217  
   
SEALED AIR CORP COM
  Common Stock     6,141  
   
SEARS HOLDINGS CORP COM
  Common Stock     65,650  
   
SEI INVT CO COM
  Common Stock     4,306  
   
SELECTIVE INS GRP INC COM
  Common Stock     4,771  
   
SEMPRA ENERGY COM
  Common Stock     30,281  
   
SERVICE CORP INTL COM
  Common Stock     9,776  
   
SHAW GRP INC COM
  Common Stock     5,406  
   
SHERWIN-WILLIAMS CO COM
  Common Stock     10,944  
   
SIGMA ALDRICH CORP COM
  Common Stock     2,657  
   
SIGNET JEWELERS LTD
  Common Stock     7,746  
   
SILGAN HOLDINGS INC COM
  Common Stock     3,497  
   
SIMON PPTY GRP INC COM
  Common Stock     11,650  
   
SIMPSON MFG INC COM
  Common Stock     2,128  
   
SKYWEST INC COM
  Common Stock     3,404  
   
SMITH A O CORP CL B
  Common Stock     4,410  
   
SMITH INTL CORP COM
  Common Stock     4,515  
   
SMITHFIELD FOODS INC COM
  Common Stock     6,233  
   
SNAP ON INC COM
  Common Stock     6,087  
   
SONOCO PRODS CO COM
  Common Stock     9,786  
   
SOTHEBY’S COM
  Common Stock     4,758  
   
SOUTHERN CO COM
  Common Stock     39,218  
   
SOUTHERN COPPER CORP COM
  Common Stock     48,144  
   
SOUTHWEST AIRLINES CO COM
  Common Stock     18,562  
   
SOUTHWEST GAS CORP COM
  Common Stock     5,090  
   
SPECTRA ENERGY CORP COM
  Common Stock     18,895  
   
SPIRIT AEROSYSTEMS HOLD-CL A COM
  Common Stock     7,329  
   
SPRINT NEXTEL COM
  Common Stock     59,268  
   
SPX CORP COM
  Common Stock     5,757  
   
ST JOE COMPANY COM
  Common Stock     2,468  
   
ST JUDE MED INC COM
  Common Stock     4,348  
   
ST MARY LAND & EXPL CO COM
  Common Stock     1,931  
   
STANCORP FINANCIAL GROUP COM
  Common Stock     8,311  
   
STANDARD REGISTER CO COM
  Common Stock     2,145  

37


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
STANLEY WKS COM
  Common Stock     6,149  
   
STAPLES INC COM
  Common Stock     7,875  
   
STARBUCKS CORP COM
  Common Stock     6,324  
   
STARWOOD HOTELS & RESORTS COM
  Common Stock     15,670  
   
STATE STREET CORP COM
  Common Stock     37,762  
   
STEEL DYNAMICS INC COM
  Common Stock     5,887  
   
STEELCASE INC CL A
  Common Stock     8,022  
   
STERIS CORP COM
  Common Stock     2,503  
   
STRYKER CORP COM
  Common Stock     11,973  
   
SUBURBAN PROPANE PARTNERS LP
  Common Stock     3,737  
   
SUN MICROSYSTEMS INC COM
  Common Stock     15,226  
   
SUNOCO INC COM
  Common Stock     25,002  
   
SUNOCO LOGISTICS PARTNERS LP COM
  Common Stock     4,714  
   
SUNTRUST BANKS INC COM
  Common Stock     71,775  
   
SUPERVALU INC COM
  Common Stock     24,262  
   
SUSQUEHANNA BANCSHARES INC PA COM
  Common Stock     2,033  
   
SWIFT ENERGY CO COM
  Common Stock     5,012  
   
SYMANTEC CORP COM
  Common Stock     9,682  
   
SYNNEX CORP COM
  Common Stock     3,572  
   
SYNOPSYS INC COM
  Common Stock     3,539  
   
SYNOVUS FINANCIAL CORP COM
  Common Stock     7,912  
   
SYSCO CORP COM
  Common Stock     46,364  
   
SYSTEMAX INC COM
  Common Stock     2,937  
   
T ROWE PRICE GROUP INC COM
  Common Stock     9,230  
   
TARGET CORP COM
  Common Stock     44,791  
   
TCF FINL CORP COM
  Common Stock     5,618  
   
TD AMERITRADE HOLDING CORP COM
  Common Stock     59,795  
   
TECH DATA CORP COM
  Common Stock     26,904  
   
TECO ENERGY INC COM
  Common Stock     5,236  
   
TELEFLEX INC COM
  Common Stock     4,891  
   
TELEPHONE & DATA SYS INC COM
  Common Stock     15,992  
   
TELLABS INC COM
  Common Stock     4,798  
   
TEMPLE INLAND INC COM
  Common Stock     18,900  
   
TENET HEALTHCARE CORP COM
  Common Stock     12,712  
   
TENNECO INC COM
  Common Stock     21,344  
   
TERADATA CORP COM
  Common Stock     4,968  
   
TEREX CORP COM
  Common Stock     11,829  
   
TERRA INDS INC COM
  Common Stock     4,844  
   
TERRA NITROGEN CO LP COM
  Common Stock     5,447  
   
TESORO CORP COM
  Common Stock     9,832  
   
TEXAS INSTRUMENTS INC COM
  Common Stock     27,755  
   
TEXTRON INC COM
  Common Stock     11,824  
   
TFS FINANCIAL CORP COM
  Common Stock     3,101  
   
THE SCOTTS MIRACLE GRO COMPANY CL A
  Common Stock     2,873  
   
THERMO FISHER SCIENTIFIC CORP COM
  Common Stock     15,571  
   
THOMAS & BETTS CORP COM
  Common Stock     3,743  

38


Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
THOR INDS INC COM
  Common Stock     3,719  
   
TIDEWATER INC COM
  Common Stock     1,205  
   
TIFFANY & CO COM
  Common Stock     4,303  
   
TIM HORTONS INC COM
  Common Stock     3,655  
   
TIMBERLAND CO CL A
  Common Stock     2,733  
   
TIME WARNER CABLE COM
  Common Stock     40,648  
   
TIME WARNER INC COM
  Common Stock     115,444  
   
TIMKEN CO COM
  Common Stock     12,924  
   
TITANIUM METALS CORP COM
  Common Stock     5,200  
   
TJX COS INC COM
  Common Stock     23,552  
   
TNS INC COM
  Common Stock     3,194  
   
TOOTSIE ROLL INDS INC COM
  Common Stock     2,638  
   
TORCHMARK CORP COM
  Common Stock     16,627  
   
TORO CO COM
  Common Stock     4,512  
   
TOTAL SYS SVCS INC COM
  Common Stock     4,630  
   
TRANSATLANTIC HLDGS INC COM
  Common Stock     12,650  
   
TRAVELERS COS INC COM
  Common Stock     111,260  
   
TRIMBLE NAV LTD COM
  Common Stock     2,532  
   
TRUSTCO BANK CORP NY COM
  Common Stock     2,771  
   
TRW AUTOMOTIVE HOLDINGS CORP COM
  Common Stock     42,863  
   
TUESDAY MORNING CORP COM
  Common Stock     1,258  
   
TUPPERWARE CORP COM
  Common Stock     6,872  
   
TUTOR PERINI CORP COM
  Common Stock     2,641  
   
TW TELECOM INC COM
  Common Stock     3,005  
   
TYCO ELECTRONICS LTD COM
  Common Stock     18,057  
   
TYCO INTERNATIONAL LTD COM
  Common Stock     80,914  
   
TYSON FOODS INC COM CL A
  Common Stock     9,918  
   
U S CELLULAR CORP COM
  Common Stock     5,153  
   
UAL CORP UAL CORP COM
  Common Stock     36,781  
   
UGI CORP NEW COM
  Common Stock     4,813  
   
UIL HOLDINGS COM
  Common Stock     4,151  
   
UMPQUA HLDGS CORP COM
  Common Stock     3,676  
   
UNION PACIFIC CORP COM
  Common Stock     31,634  
   
UNISOURCE ENERGY CORP COM
  Common Stock     2,871  
   
UNISYS CORP COM
  Common Stock     6,499  
   
UNITED BANKSHARES INC W VA COM
  Common Stock     2,570  
   
UNITED FIRE & CAS CO COM
  Common Stock     2,727  
   
UNITED PARCEL SERVICE CL B COM
  Common Stock     85,659  
   
UNITED RENTALS INC COM
  Common Stock     5,704  
   
UNITED STATES STEEL CORP COM
  Common Stock     48,309  
   
UNITED STATIONERS COM
  Common Stock     3,568  
   
UNITED TECHNOLOGIES CORP COM
  Common Stock     121,760  
   
UNITEDHEALTH GROUP INC COM
  Common Stock     118,958  
   
UNITRIN INC COM
  Common Stock     15,839  
   
UNIVERSAL AMERN FINL CORP COM
  Common Stock     4,241  
   
UNIVERSAL CORP VA COM
  Common Stock     5,785  

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Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
UNIVERSAL FST PRODS INC COM
  Common Stock     1,798  
   
UNIVERSAL HLTH SVCS INC CL B COM
  Common Stock     4,181  
   
UNUMPROVIDNET GROUP COM
  Common Stock     32,743  
   
URBAN OUTFITTERS INC COM
  Common Stock     4,455  
   
URS CORP COM
  Common Stock     4,203  
   
US BANCORP DEL COM
  Common Stock     102,121  
   
USA MOBILITY INC COM
  Common Stock     4,897  
   
USEC INC COM
  Common Stock     1,548  
   
V F CORP COM
  Common Stock     9,266  
   
VAIL RESORTS INC COM
  Common Stock     2,764  
   
VALERO ENERGY CORP COM
  Common Stock     87,343  
   
VALIDUS HOLDINGS LTD COM
  Common Stock     8,790  
   
VALLEY NATIONAL BANCORP COM
  Common Stock     5,279  
   
VALSPAR CORP COM
  Common Stock     3,311  
   
VARIAN MED SYS INC COM
  Common Stock     4,398  
   
VECTOR GROUP LTD COM
  Common Stock     2,144  
   
VECTREN CORP COM
  Common Stock     2,884  
   
VENTAS INC COM
  Common Stock     3,762  
   
VERIZON COMMUNICATIONS COM
  Common Stock     170,192  
   
VIACOM INC CL B COM
  Common Stock     23,212  
   
VIRGIN MEDIA INC COM
  Common Stock     13,085  
   
VISA INC CLASS A SHARES COM
  Common Stock     17,516  
   
VISHAY INTERTECHNOLOGY INC COM
  Common Stock     7,928  
   
VMWARE INC CL A COM
  Common Stock     6,815  
   
VORNADO REALTY TRUST COM
  Common Stock     10,067  
   
VULCAN MATERIALS CO COM
  Common Stock     2,999  
   
W W GRAINGER INC COM
  Common Stock     6,087  
   
W&T OFFSHORE INC COM
  Common Stock     5,317  
   
WABCO HOLDINGS INC COM
  Common Stock     5,384  
   
WADDELL & REED FINL INC CL A COM
  Common Stock     3,614  
   
WAL-MART STORES INC COM
  Common Stock     263,462  
   
WALGREEN CO COM
  Common Stock     42,740  
   
WARNACO GRP INC COM
  Common Stock     2,458  
   
WARNER CHILCOTT PLC CL A COM
  Common Stock     3,000  
   
WARNER MUSIC GROUP CORP COM
  Common Stock     4,922  
   
WASHINGTON FED INC COM
  Common Stock     6,531  
   
WASHINGTON POST CO CL B COM
  Common Stock     9,347  
   
WASTE MGMT INC DEL COM
  Common Stock     21,653  
   
WATERS CORP COM
  Common Stock     5,084  
   
WATSCO INC CL A
  Common Stock     2,388  
   
WATSON PHARMACEUTICALS INC COM
  Common Stock     2,633  
   
WATSON WYATT WORLDWIDE INC A COM
  Common Stock     1,995  
   
WATTS INDS INC CL A
  Common Stock     2,942  
   
WEATHERFORD INTL LTD COM
  Common Stock     10,012  
   
WEIGHT WATCHERS INTL INC COM
  Common Stock     2,010  
   
WEIS MKTS INC COM
  Common Stock     4,259  

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Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
   
WELLPOINT INC COM
  Common Stock     92,951  
   
WELLS FARGO & CO COM
  Common Stock     90,072  
   
WERNER ENTERPRISES INC COM
  Common Stock     5,719  
*  
WESCO FINL CORP COM
  Common Stock     2,397  
*  
WESCO INTL INC COM
  Common Stock     4,716  
   
WESTAR ENERGY INC COM
  Common Stock     3,547  
   
WESTERN DIGITAL CORP COM
  Common Stock     6,247  
   
WESTERN REFINING INC COM
  Common Stock     1,385  
   
WESTERN UNION CO COM
  Common Stock     8,162  
   
WEYERHAEUSER CO COM
  Common Stock     26,482  
   
WGL HLDG INC COM
  Common Stock     4,178  
   
WHIRLPOOL CORP COM
  Common Stock     38,456  
   
WHITNEY HLDG CORP COM
  Common Stock     2,988  
   
WHOLE FOODS MKT INC COM
  Common Stock     5,953  
   
WILEY JOHN & SONS INC CL A
  Common Stock     3,105  
   
WILLIAMS COS INC COM
  Common Stock     26,233  
   
WILLIAMS SONOMA INC COM
  Common Stock     9,778  
   
WILLIS GROUP HOLDINGS LTD COM
  Common Stock     9,363  
   
WILMINGTON TR CORP COM
  Common Stock     5,158  
   
WINDSTREAM CORP COM
  Common Stock     8,658  
   
WINN-DIXIE STORES INC COM
  Common Stock     2,477  
   
WISCONSIN ENERGY CORP COM
  Common Stock     7,943  
   
WORLD FUEL SVCS CORP
  Common Stock     10,705  
   
WORTHINGTON INDS INC COM
  Common Stock     3,131  
   
WRIGHT EXPRESS CORP COM
  Common Stock     12,804  
   
WYNDHAM WORLDWIDE CORP COM
  Common Stock     9,940  
   
WYNN RESORTS LTD COM
  Common Stock     2,475  
   
XCEL ENERGY INC COM
  Common Stock     15,630  
   
XEROX CORP COM
  Common Stock     15,495  
   
XILINX INC COM
  Common Stock     7,681  
   
XL CAPITAL LTD COM
  Common Stock     36,475  
   
XTO ENERGY INC COM
  Common Stock     20,964  
   
YAHOO! INC COM
  Common Stock     6,210  
   
YUM! BRANDS INC COM
  Common Stock     18,702  
   
ZENITH NATL INS CORP COM
  Common Stock     9,570  
   
ZIMMER HOLDINGS INC COM
  Common Stock     8,666  
   
ZIONS BANCORP COM
  Common Stock     11,296  
   
 
         
   
RAFI Enhanced Large Company
           
   
Fund Total
        20,946,580  
   
 
         
   
 
           

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Table of Contents

     
WESCO Distribution, Inc.
   
Retirement Savings Plan
   
Schedule of Assets (Held at End of Year)
   
EIN 25-1723345, Plan Number 001
   
December 29, 2009
  Schedule H, line 4i
                 
(a)   (b)   (c)   (d)  
        Description of Investment      
    Identity of Issue,   Including Maturity Date,      
    Borrower, Lessor or   Rate of Interest, Collateral,   Current  
    Similar Party   Par, or Maturity Value   Value  
*  
Participant Loans
  4.25%-10.0% with maturity dates through 2014     9,154,053  
   
 
         
   
Participant Loans Total
        9,154,053  
   
 
         
   
 
           
   
Total Investments at Fair Value
      $ 352,686,685  
   
 
         
 
                 
*  
Denotes party-in-interest, for which A statutory exemption exists.
           

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Table of Contents

WESCO Distribution, Inc.
Retirement Savings Plan
Consents of Independent Registered Public Accounting Firm
December 29, 2009 and 2008
EXHIBITS
     The following exhibit is filed or incorporated as part of this report:
     
Exhibit    
Number   Description
23.1
  Consent of Alpern Rosenthal (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 28, 2010  /s/ Stephen A. Van Oss    
  Stephen A. Van Oss   
  Chairman, 401K Retirement Savings Plan Investment and Administrative Committees   

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