 LOS ANGELES, Oct. 11, 2021 PRNewswire -- Glancy Prongay Murray LLP GPM announces that investors with substantial losses have opportunity to lead the securities fraud class action lawsuit against Sesen Bio, Inc. NASDAQ: SESN. Class Period: December 21, 2020 - August 17, 2021 Lead Plaintiff Deadline: October 18, 2021 If you wish to serve as lead plaintiff of the Sesen Bio lawsuit, you can submit your contact information at 