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 *
CAMPBELL NEAL J.
  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)
See Remarks
(Last)
(First)
(Middle)
C/O CDW CORPORATION, 200 N. MILWAUKEE AVE
3. Date of Earliest Transaction (Month/Day/Year)
04/16/2018
(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 04/16/2018   M   3,500 A $ 17 32,711.09 (1) D  
Common Stock, par value $0.01 04/16/2018   S   3,500 (2) D $ 69.56 (3) 29,211.09 D  
Common Stock, par value $0.01 04/16/2018   S   305 (2) D $ 70.19 28,906.09 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) $ 17 04/16/2018   M     3,500   (4) 03/10/2021 Common Stock, par value $0.01 3,500 $ 0 42,672 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
CAMPBELL NEAL J.
C/O CDW CORPORATION
200 N. MILWAUKEE AVE
VERNON HILLS, IL 60061
      See Remarks  

Signatures

 /s/ Robert J. Welyki, Attorney-in-Fact   04/18/2018
**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) Since the date of the reporting person's last ownership report, he transferred 2,813 shares to his former spouse pursuant to a domestic relations order. In addition, since the date of the reporting person's last ownership report, he transferred 2,679 vested stock options with a grant date of February 19, 2015, 2,545 vested stock options with a grant date of March 2, 2016 and 2,916 vested stock options with a grant date of February 28, 2017 to his former spouse pursuant to a domestic relations order. As a result, stock options held by the reporting person following such transfers are, respectively, 9,824 (grant date of February 25, 2015), 11,875 (grant date of March 2, 2016) and 16,519 (grant date of February 28, 2017).
(2) The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 19, 2017, amended March 23, 2018.
(3) The price reported is the average weighted price. The shares were sold in multiple transactions at prices ranging from $69.06 to $69.84, inclusive. The reporting person undertakes to provide to the SEC, the Issuer and any security holder, the full information regarding the number of shares and the prices at which the shares were sold.
(4) Options for 80,105 shares were granted at the time of the initial public offering of CDW Corporation on June 26, 2013 (the "IPO"), of which options for 60,029 shares were vested upon issuance and the remaining options vested daily on a pro rata basis from June 26, 2013 through March 9, 2016.
 
Remarks:
Senior Vice President- Strategic Solutions and Services

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