X0306 4 2017-07-21 0 0001113148 INFINITY PHARMACEUTICALS, INC. INFI 0001375124 Perkins Adelene Q C/O INFINITY PHARMACEUTICALS, INC. 784 MEMORIAL DRIVE CAMBRIDGE MA 02139 1 1 0 0 Chief Executive Officer Common Stock 2017-07-21 4 A 0 85800 0.00 A 535020 D Common Stock 12391.26 I 401(k) Represents shares from a grant of performance-based restricted stock on July 22, 2016. Upon the determination by the Compensation Committee of our Board of Directors, such shares vested on July 21, 2017. /s/ Seth Tasker as attorney-in-fact for Adelene Q. Perkins 2017-07-24