CDW Corp — Director's Dealing 2013

Jun 27, 2013

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: CDW Corp (CDW)
CIK: 0001402057
Period of Report: 2013-06-26

Reporting Person: MADISON DEARBORN PARTNERS LLC (10% Owner)
Reporting Person: Madison Dearborn Capital Partners V - A L P (10% Owner)
Reporting Person: Madison Dearborn Capital Partners V - C L P (10% Owner)
Reporting Person: MADISON DEARBORN CAPITAL PARTNERS V EXECUTIVE-A L P (10% Owner)
Reporting Person: MDCP Co-Investors (CDW) LP (10% Owner)
Reporting Person: MADISON DEARBORN PARTNERS V-A&C, L.P. (10% Owner)
Reporting Person: MENCOFF SAMUEL M (10% Owner)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, par value $0.01	66739156	Indirect

Footnotes

F1: Consists of 43,565,137 shares held directly by Madison Dearborn Capital Partners V-A, L.P. ("MDP A"), 11,557,077 shares held directly by Madison Dearborn Capital Partners V-C, L.P. ("MDP C"), 437,743 shares held directly by Madison Dearborn Capital Partners V Executive-A, L.P. ("MDP Exec") and 11,179,199 shares held directly by MDCP Co-Investors (CDW), L.P. ("MDP 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 (Continued in footnote 2)

F2: 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 his pecuniary interest therein.

F3: Mr. Mencoff has an indirect pecuniary interest in the shares of CDW Corporation's common stock held of record by the various MDP funds described above through his investment in MDP V. Each of MDP A, MDP C, MDP Exec and MDP Co-Investor and Mr. Mencoff may be deemed to share beneficial ownership of the reported securities and expressly disclaims beneficial ownership of such shares except to the extent of its or his pecuniary interest therein.

F4: Mr. Finnegan has separately filed a Form 3.