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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1402057	Cdw Corp	CDW	Retail-Catalog & Mail-Order Houses (5961)	260273989

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1182031	J Paul Finnegan	C/O Madison Dearborn Partners, Llc 70 W. Madison Street, Suite 4600 Chicago IL 60602		Yes	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $0.01	Disposition	2013-12-18	1,163,334	$20.50	58,093,318	No	4	S	Indirect	See footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnotes

Footnotes

Consists of 759,387 shares sold by Madison Dearborn Capital Partners V-A, L.P. ("MDP A"), 201,452 shares sold by Madison Dearborn Capital Partners V-C, L.P. ("MDP C"), 7,630 shares sold by Madison Dearborn Capital Partners V Executive-A, L.P. ("MDP Exec") and 194,865 shares sold by MDCP Co-Investor (CDW), L.P. ("MDP Co-Investor"), all pursuant to the underwriters' exercise of their option to purchase additional shares in an underwritten secondary offering.
Consists of 37,921,416 shares held directly by MDP A, 10,059,896 shares held directly by MDP C, 381,035 shares held directly by MDP Exec and 9,730,971 shares held directly by MDCP Co-Investor. Madison Dearborn Partners V-A&C, L.P. ("MDP V") is the general partner of MDP A, MDP C, MDP Exec and MDP Co-Investor. Madison Dearborn Partners, LLC ("MDP") is the general partner of MDP V. As the sole members of a limited partner committee of MDP V that has the power, acting by majority vote, to vote or dispose of the shares directly held by MDP A, MDP C, MDP Exec and MDP Co-Investor, Paul J. Finnegan and Samuel M. Mencoff may be deemed to have shared voting and investment power over such shares. Each of Messrs. Finnegan and Mencoff and MDP V hereby disclaims any beneficial ownership of any shares held by MDP A, MDP C, MDP Exec and MDP Co-Investor except to the extent of its or his pecuniary interest therein.
The record and other beneficial owners of the reported securities have separately filed Form 4s.