CDW CORPORATION (Exact Name of Registrant As Specified in Its Charter)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2010 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 333-169258 CDW CORPORATION (Exact name of registrant as specified in its charter) Delaware 26 -0273989 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 200 N. Milwaukee Avenue Vernon Hills, Illinois 60061 (Address of principal executive offices) (Zip Code) (847) 465-6000 (Registrant’s telephone number, including area code) None (Former name, former address and former fiscal year, if changed since last report) Securities registered pursuant to Section 12(b) of the Act: None Securities registered pursuant to Section 12(g) of the Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes No Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes No Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes No Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act (Check one): Large accelerated filer Accelerated filer Non -accelerated filer (Do not check if a smaller reporting company) Smaller reporting company Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes No The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant as of June 30, 2010, the last business day of the registrant’s most recently completed second fiscal quarter, was zero. As of February 25, 2011, there were 100,000 Class A common shares, $0.01 par value, outstanding, and 911,176 Class B common shares, $0.01 par value, outstanding, all of which were owned by CDW Holdings LLC. DOCUMENTS INCORPORATED BY REFERENCE None Table of Contents CDW CORPORATION AND SUBSIDIARIES ANNUAL REPORT ON FORM 10-K Year Ended December 31, 2010 TABLE OF CONTENTS Item Page PART I Item 1. Business 4 Item 1A. Risk Factors 11 Item 1B. Unresolved Staff Comments 17 Item 2. Properties 17 Item 3. Legal Proceedings 17 Item 4. (Removed and Reserved) 18 PART II Item 5. Market for Registrant ’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities 19 Item 6. Selected Financial Data 20 Item 7. Management ’s Discussion and Analysis of Financial Condition and Results of Operations 24 Item 7A. Quantitative and Qualitative Disclosures About Market Risk 44 Item 8. Financial Statements and Supplementary Data 45 Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure 88 Item 9A. Controls and Procedures 88 Item 9B. Other Information 88 PART III Item 10. Directors, Executive Officers and Corporate Governance 89 Item 11. Executive Compensation 94 Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters 109 Item 13. Certain Relationships and Related Transactions, and Director Independence 110 Item 14. Principal Accountant Fees and Services 111 PART IV Item 15. Exhibits and Financial Statement Schedules 112 SIGNATURES 113 2 Table of Contents FORWARD-LOOKING STATEMENTS This report contains forward-looking statements within the meaning of the federal securities laws. All statements other than statements of historical fact included in this report are forward-looking statements. These statements relate to analyses and other information, which are based on forecasts of future results and estimates of amounts not yet determinable. These statements also relate to our future prospects, developments and business strategies. We claim the protection of The Private Securities Litigation Reform Act of 1995 for all forward-looking statements in this report. These forward-looking statements are identified by the use of terms and phrases such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “predict,” “project,” “will” and similar terms and phrases, including references to assumptions. However, these words are not the exclusive means of identifying such statements. Although we believe that our plans, intentions and expectations reflected in or suggested by such forward-looking statements are reasonable, we cannot assure you that we will achieve those plans, intentions or expectations. All forward-looking statements are subject to risks and uncertainties that may cause actual results to differ materially from those that we expected. Important factors that could cause actual results to differ materially from our expectations, or cautionary statements, are disclosed under the section entitled “Risk Factors” included elsewhere in this report. All written and oral forward-looking statements attributable to us, or persons acting on our behalf, are expressly qualified in their entirety by the cautionary statements contained in the section entitled “Risk Factors” included elsewhere in this report as well as other cautionary statements that are made from time to time in our other SEC filings and public communications. You should evaluate all forward-looking statements made in this report in the context of these risks and uncertainties. We caution you that the important factors referenced above may not contain all of the factors that are important to you. In addition, we cannot assure you that we will realize the results or developments we expect or anticipate or, even if substantially realized, that they will result in the consequences or affect us or our operations in the way we expect. The forward-looking statements included in this report are made only as of the date hereof. We undertake no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as otherwise required by law. 3 Table of Contents PART I Item 1. Business Overview CDW is a leading multi-brand technology solutions provider to business, government, education and healthcare customers in the U.S. and Canada. We provide comprehensive and integrated solutions for our customers’ technology needs through our extensive hardware, software and value-added service offerings. We serve over 250,000 customers through our experienced and dedicated sales force of more than 3,400 coworkers. We offer over 100,000 products from over 1,000 brands and a multitude of advanced technology solutions. Our broad range of technology products includes leading brands such as Hewlett-Packard, Microsoft, Cisco, Lenovo, EMC, IBM, Apple and VMware. Our offerings range from discrete hardware and software products to complex technology solutions such as virtualization, collaboration, security, mobility, data center optimization and cloud computing. Our sales and operating results have been driven by the combination of our large and knowledgeable selling organization, highly skilled technology specialists and engineers, extensive range of product offerings, strong vendor partner relationships, and fulfillment and logistics capabilities. For the year ended December 31, 2010, our net sales and Adjusted EBITDA were $8,801.2 million and $601.8 million, respectively. See “Selected Financial Data” included elsewhere in this report for the definition of Adjusted EBITDA and a reconciliation to net income. We have two reportable segments: Corporate. Our Corporate segment customers are primarily in the small and medium business category, which we define as customers with up to 1,000 employees at a single location. We also serve larger customers, including FORTUNE 1000 companies, that value our broad offerings, brand selection and flexible delivery model. We have over 200,000 active accounts, well diversified across numerous industries. Our Corporate segment is divided into a small business customer channel, primarily serving customers with up to 100 employees, and a medium- large business customer channel, primarily serving customers with more than 100 employees. Our Corporate segment sales team is primarily organized by geography and customer size. We believe this enables us to better understand and serve customer needs, optimize sales resource coverage and strengthen relationships with vendor partners to create more sales opportunities. Our Corporate segment generated net sales of $4,833.6 million for the year ended December 31, 2010. Public. Our Public segment is divided into government, education and healthcare customer channels. The government channel serves federal as well as state and local governments. Our education channel serves higher education and K-12 customers. The healthcare channel serves customers across the healthcare provider industry.

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