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

Page 6 of 9 – SEC Filing

SCHEDULE 13D

CUSIP No. 12508E101 Page
6
of 9

This amendment No. 4 to Schedule 13D (this Amendment No. 4), amends
and supplements the Schedule 13D (the Original 13D) filed on October 27, 2014 (the Original 13D, as amended and supplemented through the date of this Amendment No. 4, the Schedule 13D), by the Reporting
Persons, relating to the common stock, par value $0.01 per share (the Common Stock), of CDK Global, Inc., a Delaware corporation (the Issuer).

This Amendment No. 4 is being filed to disclose a reduction in the beneficial ownership of the Reporting Persons of Common Stock as a result
of sales of Common Stock. As the Reporting Persons no longer beneficially own more than 5% of the outstanding shares of Common Stock, this Amendment No. 4 constitutes the final amendment to the Schedule 13D.

Capitalized terms not defined in this Amendment No. 4 shall have the meaning ascribed to them in the Original 13D. Except as set forth herein,
the Schedule 13D is unmodified.

ITEM 1. SECURITY AND ISSUER

Item 1 of the Schedule 13D is hereby amended and supplemented to add the following information:

As of July 22, 2016, the Reporting Persons beneficially owned an aggregate of 6,732,959 shares of Common Stock, representing approximately
4.3% of the outstanding shares of Common Stock. The Reporting Persons also have additional economic exposure to approximately 3,152,667 notional shares of Common Stock under certain cash-settled total return swaps, bringing their total aggregate
economic exposure to 9,885,626 shares of Common Stock, representing approximately 6.4% of the outstanding shares of Common Stock.

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