Agenus to Report First Quarter 2013 Financial Results on April 24, 2013; Conference Call to Follow

Agenus Inc. (Nasdaq:AGEN) will release its first quarter 2013 financial results before the market opens on April 24, 2013.

Agenus executives will host a conference call at 11:00 a.m. Eastern Time that same day. To access the live call, dial 647-426-1845; the access code is R128039. The call will also be webcast and will be accessible atwww.agenusbio.com/webcast/. A replay will be available approximately two hours after the call through midnight Eastern Time on June 21, 2013. The replay number is 416-915-1035 and the access code is 735470. The replay will also be available on the company's website approximately twenty four hours after the live call.

Agenus Inc. is a biotechnology company working to develop treatments for cancers and infectious diseases. The company is focused on immunotherapeutic products based on strong platform technologies with multiple product candidates advancing through the clinic, including several product candidates that have advanced into late-stage clinical trials through corporate partners. Between Agenus and its partners, 19 programs are in clinical development. For more information, please visit www.agenusbio.com.

Contact:

Media and Investor Contact:
Jonae R. Barnes
Vice President
Investor Relations and
Corporate Communications
617-818-2985