 Philadelphia, Pennsylvania--Newsfile Corp. - October 6, 2021 - Berger Montague is investigating securities fraud allegations against Sesen Bio, Inc. Sesen or the Company. The Firm is investigating these claims on behalf of investors who purchased Sesen securities NASDAQ: SESN between December 21, 2020 and August 17, 2021 the Class Period. If you purchased Sesen securities during the Class Period, would like to discuss Berger Montagues investigation, or have questions concerning your rights or interests, please... 