Ownership Submission
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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(Print or Type Responses)
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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