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 * FAIRFIELD NEIL B   2. Issuer Name and Ticker or Trading Symbol CDW Corp [CDW] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) VICE PRESIDENT & CONTROLLER (Last) (First) (Middle) C/O CDW CORPORATION, 200 N. MILWAUKEE AVE 3. Date of Earliest Transaction (Month/Day/Year) 03/03/2017 (Street) VERNON HILLS, IL 60061 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ 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 03/03/2017   M   1,014 A $ 31.64 1,483 D   Common Stock, par value $0.01 03/03/2017   S   1,014 D $ 59.429 469 D   Common Stock, par value $0.01 03/03/2017   M   1,985 A $ 37.79 2,454 D   Common Stock, par value $0.01 03/03/2017   S   1,985 D $ 59.445 469 D   Common Stock, par value $0.01 03/03/2017   M   2,324 A $ 39.79 2,793 D   Common Stock, par value $0.01 03/03/2017   S   2,324 D $ 59.434 469 D

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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

Employee Stock Option (Right to Buy)

$ 31.64

03/03/2017

M

1,014

(1)

08/13/2024

Common Stock, par value $0.01

1,014

$ 0

0

D

Employee Stock Option (Right to Buy)

$ 37.79

03/03/2017

M

1,985

(2)

02/19/2025

Common Stock, par value $0.01

1,985

$ 0

1,985

D

Employee Stock Option (Right to Buy)

$ 39.79

03/03/2017

M

2,324

(3)

03/02/2026

Common Stock, par value $0.01

2,324

$ 0

4,650

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
FAIRFIELD NEIL B C/O CDW CORPORATION 200 N. MILWAUKEE AVE VERNON HILLS, IL 60061			VICE PRESIDENT & CONTROLLER

Signatures

/s/ Robert J. Welyki, Attorney-in-Fact		03/06/2017
**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)	The options vest as to one half of the shares on each of February 25, 2016 and 2017. The grant was made under the LTIP.
(2)	The options vest as to one third of the shares on each of the first three anniversaries of the date of grant (February 19, 2015). The grant was made under the LTIP.
(3)	The options vest as to one third of the shares on each of the first three anniversaries of the date of grant ( March 2, 2016). The grant was made under the CDW Corporation 2013 Long-Term Incentive Plan.

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