CDK Global (CDK): Sachem Head Capital Dumps More Shares

Page 7 of 9 – SEC Filing

SCHEDULE 13D

CUSIP No. 12508E101 Page
7
of 9

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER

Item 5 of the Schedule 13D is hereby amended and supplemented by adding the following information:

(a), (b) Based upon the Issuers quarterly report on Form 10-Q filed on May 5, 2016, there were approximately 155,336,347 shares of
the Common Stock outstanding as of May 2, 2016.

Based on the foregoing, as of July 22, 2016, the 6,732,959 shares of the Common Stock
(the Subject Shares) beneficially owned by the Reporting Persons represent approximately 4.3% of the shares of the Common Stock issued and outstanding.

(c) Exhibit 99.5 which is incorporated by reference into this Item 5(c) as if restated in full, describes all of the transactions in shares of
Common Stock, swaps and options that were effected since Amendment No. 3 to the Schedule 13D by the Reporting Persons for the benefit of the Sachem Head Funds, including certain portfolio rebalancing transactions among the Sachem Head Funds
that do not change the number of shares beneficially owned by the Reporting Persons. Those transactions were effected for the accounts of the Sachem Head Funds, as further specified in Exhibit 99.5. Except as set forth in Exhibit 99.5, since
Amendment No. 3 to the Schedule 13D, no reportable transactions were effected by any Reporting Person.

(e) As of July 5, 2016, the
Reporting Persons no longer beneficially own more than 5% of the shares of the Common Stock and, accordingly, are no longer required to file amendments on Schedule 13D with respect to the Issuer.

ITEM 7. MATERIAL TO BE FILED AS AN EXHIBIT

Item 7 of the Schedule 13D is hereby amended and supplemented by adding a reference to the following exhibit:

Exhibit 99.5 Trading data.

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