13D Filing: Marcato Capital Management and Deckers Outdoor Corp (DECK)

SCHEDULE 13D

This amendment No. 6 to Schedule 13D (this Amendment No. 6), amends and supplements the
Schedule 13D filed on February 8, 2017 (the Initial 13D and, as amended and supplemented through the date of this Amendment No. 6, collectively, the Schedule 13D) by the Reporting Persons, relating to the common
stock, par value $0.01 per share (the Shares), of Deckers Outdoor Corporation, a Delaware corporation (the Issuer). Capitalized terms not defined in this Amendment No. 6 shall have the meaning ascribed to them in the
Schedule 13D.

The information set forth in response to each separate Item below shall be deemed to be a response to all Items where such
information is relevant.

Item 4. Purpose of Transaction

Item 4 of the Schedule 13D is hereby supplementally amended as follows:

On December 4, 2017, Marcato International submitted to the Issuer an update and supplement to the Notice to notify the Issuer of Marcato
Internationals withdrawal of Deborah M. Derby, Matthew P. Hepler, Robert D. Huth, Jan Rogers Kniffen, Mitchell A. Kosh and Nathaniel J. Lipman as Nominees. A copy of such update and supplement is filed herewith as Exhibit L and is incorporated
herein by reference. Kirsten J. Feldman, Steve Fuller and Anne Waterman continue to be Marcatos Nominees for election to the Board at the 2017 Annual Meeting and Marcato intends to nominate each of Kirsten J. Feldman, Steve Fuller and Anne
Waterman at the 2017 Annual Meeting.