Zoetis Inc. (ZTS): Billionaire William Ackman’s Pershing Square Sells 6 Million Shares

Page 5 of 7 – SEC Filing

This amendment No. 6 to Schedule 13D relates to the Schedule 13D filed on November 12,
2014, as amended prior to the date of this amendment (as so amended, the Original Schedule 13D), by (i) Pershing Square Capital Management, L.P., a Delaware limited partnership (Pershing Square),
(ii) PS Management GP, LLC, a Delaware limited liability company (PS Management), and (iii) William A. Ackman, a citizen of the United States (together with Pershing Square and PS Management, the Reporting
Persons
), relating to the common stock, par value $0.01 per share (the Common Stock), of Zoetis Inc., a Delaware corporation (the Issuer). Capitalized terms used but not defined in this amendment shall
have the meanings set forth in the Original Schedule 13D.

Item 1. Security and Issuer

The second paragraph of Item 1 of the Original Schedule 13D is hereby amended and restated to read in full as follows:

The Reporting Persons (as defined below) beneficially own 18,891,304 shares of Common Stock (the Subject Shares). The
Subject Shares represent approximately 3.8% of the shares of Common Stock outstanding, based on 496,202,370 shares of Common Stock outstanding as of April 29, 2016 as reported in the Issuers Quarterly Report on Form 10-Q filed on
May 6, 2016.

Item 5. Interest in the Securities of the Issuer

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

Exhibit 99.12 filed herewith and Exhibit 99.11 previously filed, both of which are incorporated herein by reference, describe all of the
transactions in shares of or derivatives relating to Common Stock that were effected by the Reporting Persons in the past 60 days. Those transactions were effected for the accounts of the Pershing Square Funds, as further specified therein.

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

As of June 15, 2016, each of the Reporting Persons ceased to be the beneficial owner of more than five percent of the Common Stock.

Item 7. Material to be Filed as Exhibits

Exhibit

Description

99.12 Trading data

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