X0306 4 2022-02-02 false 0001395937 Syndax Pharmaceuticals Inc SNDX 0001654430 Morrison Briggs C/O SYNDAX PHARMACEUTICALS, INC. 35 GATEHOUSE DRIVE, BUILDING D, FLOOR 3 WALTHAM MA 02451 true true false false President, Head of R&D Stock Options (Right to buy) 15.79 2022-02-02 4 A false 160000.00 15.79 A 2032-02-02 Common Stock 160000.00 160000.00 D The securities awarded on 02/02/2022 were in the form of stock options issued pursuant to the Syndax Pharmaceuticals, Inc. 2015 Omnibus Incentive Plan. Options to purchase 100,000 shares of common stock shall vest in 48 successive equal monthly installments measured from 02/02/2022. Options to purchase 60,000 shares of common stock shall vest periodically upon the Issuer achieving certain milestones. /s/ Michael A. Metzger, Attorney-in-fact 2022-02-03