X0306 4 2015-11-30 0 0001402057 CDW Corp CDW 0001084355 CREAMER GLENN M C/O PROVIDENCE EQUITY PARTNERS L.L.C. 50 KENNEDY PLAZA, 18TH FLOOR PROVIDENCE RI 02903 1 0 0 0 Common Stock, par value $0.01 2015-11-30 4 S 0 3754053 44.05 D 7832639 I See footnote Consists of 2,378,543 shares sold by Providence Equity Partners VI L.P. ("PEP VI"), 818,247 shares sold by Providence Equity Partners VI-A L.P. ("PEP VI-A") and 557,263 shares sold by PEP Co-Investors (CDW) L.P. ("PEP Co-Investor") in an underwritten secondary offering. This sale price reflects the public offering price. The price received by the reporting person will be reduced by the underwriters' commission of $0.22 per share. Consists of 4,962,707 shares held directly by PEP VI, 1,707,231 shares held directly by PEP VI-A and 1,162,701 shares held directly by PEP Co-Investor. The shares held by PEP VI, PEP VI-A and PEP Co-Investor may be deemed to be beneficially owned by PEP GP, the general partner of PEP VI, PEP VI-A and PEP Co-Investor and PEP LLC, the general partner of PEP GP. Mr. Glenn Creamer is a member of PEP LLC and may be deemed to have shared voting and investment power over such shares. Mr. Creamer hereby disclaims any beneficial ownership of any shares held by PEP VI, PEP VI-A and PEP Co-Investor except to the extent of his pecuniary interest therein. /s/ James S. Rowe, under Power of Attorney 2015-12-02