Effective on April 22, 2021, Sesen Bio, Inc. appointed Elly Ryu as the Company’s Corporate Controller and Principal Accounting Officer. Ms. Ryu, age 40, has served as the Company’s Senior Director, Accounting since February 2021. Before joining the Company, Ms. Ryu served as the Corporate Controller of Fi Holdings, LLC from January 2020 to February 2021. Previously, Ms. Ryu served as the Director of Accounting and Finance at Acrotech Biopharma, LLC from March 2019 to November 2019. Kirstin Anderson, the Company’s former Corporate Controller and Principal Accounting Officer, has advanced to Senior Director of Finance, and will be focused on supporting the commercial launch of Vicineum™.