FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Providence Equity Partners VI L.L.C.   2. Issuer Name and Ticker or Trading Symbol CDW Corp [CDW] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O PROVIDENCE EQUITY PARTNERS L.L.C., 50 KENNEDY PLAZA, 18TH FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 05/22/2015 (Street) PROVIDENCE, RI 02903 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, par value $0.01 05/22/2015   S   938,514 (1) D $ 36.6 22,654,372 (2) I See footnotes (2) (3) Common Stock, par value $0.01 05/22/2015   S   5,275,994 (4) D $ 36.8 (5) 17,378,378 (6) I See footnotes (3) (6)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Providence Equity Partners VI L.L.C. C/O PROVIDENCE EQUITY PARTNERS L.L.C. 50 KENNEDY PLAZA, 18TH FLOOR PROVIDENCE, RI 02903		X
Providence Equity Partners VI L P C/O PROVIDENCE EQUITY PARTNERS L.L.C. 50 KENNEDY PLAZA, 18TH FLOOR PROVIDENCE, RI 02903		X
Providence Equity Partners VI- A L P C/O PROVIDENCE EQUITY PARTNERS L.L.C. 50 KENNEDY PLAZA, 18TH FLOOR PROVIDENCE, RI 02903		X
PEP CO-INVESTORS (CDW) L.P. C/O PROVIDENCE EQUITY PARTNERS L.L.C. 50 KENNEDY PLAZA, 18TH FLOOR PROVIDENCE, RI 02903		X
Providence Equity GP VI L.P. C/O PROVIDENCE EQUITY PARTNERS L.L.C. 50 KENNEDY PLAZA, 18TH FLOOR PROVIDENCE, RI 02903		X
SALEM PAUL J C/O PROVIDENCE EQUITY PARTNERS L.L.C. 50 KENNEDY PLAZA, 18TH FLOOR PROVIDENCE, RI 02903		X
NELSON JONATHAN M C/O PROVIDENCE EQUITY PARTNERS L.L.C. 50 KENNEDY PLAZA, 18TH FLOOR PROVIDENCE, RI 02903		X

Signatures

Providence Equity Partners VI L.L.C. by /s/ James S. Rowe, under Power of Attorney		05/27/2015
**Signature of Reporting Person		Date
Providence Equity Partners VI L.P. by /s/ James S. Rowe, under Power of Attorney		05/27/2015
**Signature of Reporting Person		Date
Providence Equity Partners VI-A, L.P. by /s/ James S. Rowe, under Power of Attorney		05/27/2015
**Signature of Reporting Person		Date
PEP Co-Investors (CDW) L.P. by /s/ James S. Rowe, under Power of Attorney		05/27/2015
**Signature of Reporting Person		Date
Providence Equity GP VI L.P. by /s/ James S. Rowe, under Power of Attorney		05/27/2015
**Signature of Reporting Person		Date
Paul J. Salem by /s/ James S. Rowe, under Power of Attorney		05/27/2015
**Signature of Reporting Person		Date
Jonathan M. Nelson by /s/ James S. Rowe, under Power of Attorney		05/27/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Consists of 594,636 shares sold by Providence Equity Partners VI L.P. ("PEP VI"), 204,562 shares sold by Providence Equity Partners VI-A L.P. ("PEP VI-A") and 139,316 shares sold by PEP Co-Investors (CDW) L.P. ("PEP Co-Investor") to the Issuer in a stock repurchase.
(2)	Consists of 14,353,658 shares held directly by PEP VI, 4,937,831 shares held directly by PEP VI-A and 3,362,883 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 Providence Equity GP VI L.P. ("PEP GP"), the general partner of PEP VI, PEP VI-A and PEP Co-Investor and Providence Equity Partners VI L.L.C. ("PEP LLC"), the general partner of PEP GP. Messrs. Jonathan Nelson, Glenn Creamer and Paul Salem are members of PEP LLC and may be deemed to have shared voting and investment power over such shares. Each of PEP LLC, PEP GP, and Messrs. Nelson, Creamer and Salem hereby disclaims any beneficial ownership of any shares held by PEP VI, PEP VI-A and PEP Co-Investor except to the extent of any pecuniary interest therein.
(3)	Mr. Creamer has separately filed a Form 4.
(4)	Consists of 3,342,835 shares sold by PEP VI, 1,149,975 shares sold by PEP VI-A and 783,184 shares sold by PEP Co-Investor in an underwritten secondary offering.
(5)	This sale price reflects the public offering price. The price received by the reporting persons will be reduced by the underwriters' commission of $0.20 per share.
(6)	Consists of 11,010,823 shares held directly by PEP VI, 3,787,856 shares held directly by PEP VI-A and 2,579,699 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. Messrs. Jonathan Nelson, Glenn Creamer and Paul Salem are members of PEP LLC and may be deemed to have shared voting and investment power over such shares. Each of PEP LLC, PEP GP, and Messrs. Nelson, Creamer and Salem hereby disclaims any beneficial ownership of any shares held by PEP VI, PEP VI-A and PEP Co-Investor except to the extent of any pecuniary interest therein.

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