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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.__)

Filed by the Registrant  Filed by a party other than the Registrant 

Check the appropriate box:

 | Preliminary Proxy Statement
 | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
 | Definitive Proxy Statement
 | Definitive Additional Materials
 | Soliciting Material Pursuant to §240.14a-12

Syndax Pharmaceuticals, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if Other Than The Registrant)

Payment of Filing Fee (Check the appropriate box):

 | No fee required.
 | Fee paid previously with preliminary materials.
 | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.