On May 20, 2021, Seres Therapeutics, Inc. announced that David Arkowitz was appointed as the Company’s Executive Vice President and Head of Business Development, effective on the commencement of his employment with the Company, which is expected to be on or about June 1, 2021 (the date Mr. Arkowitz commences employment with the Company, the “Commencement Date”). Additionally, Mr. Arkowitz has been designated as the Company’s principal financial officer and principal accounting officer, effective as of the Commencement Date, succeeding Marcus Chapman in such roles. Mr. Chapman will continue to serve as the Company’s Senior Vice President, Finance. Mr. Arkowitz, served as the Chief Financial Officer of Flexion Therapeutics, Inc. from May 2018 to May 2021.