UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

INFORMATION REQUIRED IN CONSENT STATEMENT

SCHEDULE 14A INFORMATION

Consent Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934

(Amendment No. )

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☐ Definitive Consent Statement

☒ Definitive Additional Materials

☐ Soliciting Material Under Rule 14a-12

ZIOPHARM ONCOLOGY, INC.

(Name of Registrant as Specified in Its Charter)

ROBERT W. POSTMA

WATERMILL ASSET MANAGEMENT CORP.

JAIME VIESER

HOLGER WEIS

(Name of Persons(s) Filing Consent Statement, if Other Than the Registrant)

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WaterMill Asset Management Corp., together with the other participants named herein (collectively, “WaterMill”), has filed a definitive consent statement and accompanying WHITE consent card with the Securities and Exchange Commission to be used to solicit consents from shareholders of Ziopharm Oncology, Inc., a Delaware corporation (the “Company”), for a number of proposals, the ultimate effect of which, if successful, would be to reconstitute the Board of Directors of the Company (the “Board”) through the removal of four current members of the Board and the election of WaterMill’s three highly-qualified nominees.

Item 1: On November 15, 2020, WaterMill issued the following Google Adword online, which directs readers to www.FixZiopharm.com:

Item 2: Also on November 15, 2020, WaterMill issued the following digital advertisements, which direct readers to www.FixZiopharm.com: