X0306 4 2020-01-10 0 0001113148 INFINITY PHARMACEUTICALS, INC. INFI 0001375124 Perkins Adelene Q C/O INFINITY PHARMACEUTICALS, INC. 1100 MASSACHUSETTS AVENUE, FLOOR 4 CAMBRIDGE MA 02138 0 1 0 0 Chief Executive Officer Common Stock 2020-01-10 4 A 0 155134 0.00 A 793190 D Common Stock 16446.79 I 401(k) Stock Option (right to buy) 1.25 2020-01-10 4 A 0 606250 0.00 A 2030-01-10 Common Stock 606250 606250 D Represents the reporting person's 2019 contingent compensation award paid in shares of common stock in lieu of cash at the election of the Compensation Committee of the issuer's Board of Directors. Includes 10,593 shares of common stock acquired by the reporting person on June 14, 2019 and 10,593 shares of common stock acquired by the reporting person on December 13, 2019 through participation in the issuer's Employee Stock Purchase Plan. The option vests as to 1/48th of the shares on January 31, 2020 and vests as to 1/48th of the shares at the end of each calendar month thereafter. /s/ Adelene Q. Perkins 2020-01-13