X0306 4 2017-04-10 0 0001098972 AGENUS INC AGEN 0000935679 ARMEN GARO H 3 FORBES RD LEXINGTON MA 02421 1 1 0 0 Chairman & CEO Common Stock 2017-04-10 4 P 0 70544 3.3662 A 1389021 D Common Stock 2017-04-12 4 P 0 29456 3.2949 A 1418477 D Common Stock 4046 I By Antigenics Holdings This transaction was executed in multiple trades through a broker-dealer at prices ranging from $3.29 to $3.43. The price reported in this column reflects the weighted average sales price. Upon request, the reporting person will provide to the SEC staff full information regarding the number of Shares purchased at each price. This transaction was executed in multiple trades through a broker-dealer at prices ranging from $3.255 to $3.33. The price reported in this column reflects the weighted average sales price. Upon request, the reporting person will provide to the SEC staff full information regarding the number of Shares purchased at each price. Dr. Armen is Chairman of the Board of Managers and a member of Antigenics Holdings LLC ("Holdings") which as of the date of this report owns 4,046 shares of Agenus Inc. common stock. Dr. Armen has a pecuniary interest in only a portion of the shares held by Holdings and disclaims beneficial ownership to the extent of his pecuniary interest therein. /s/ Christine M. Klaskin, by Power of Attorney 2017-04-12