On February 3, 2021, the Board of Directors (the “Board”) of TCR2 Therapeutics Inc. (the “Company”) unanimously appointed Shawn Tomasello to fill a newly created vacancy on the Board resulting from an increase in the size of the Board from seven (7) to eight (8) directors. Upon her appointment, Ms. Tomasello became a member of the slate of Class I directors with terms expiring at the 2022 Annual Meeting of Stockholders of the Company. The Board has determined that Ms. Tomasello qualifies as an independent director and is qualified to serve under the applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) and the listing rules of the Nasdaq Stock Market LLC. Ms. Tomasello will serve on the Company’s Compensation Committee and Nominating and Corporate Governance Committee. Ms. Tomasello has successfully built and led commercial operations at several companies, including Pharmacyclics, Celgene and Genentech. Her most recent role as Chief Commercial Officer at Kite Pharma involved establishing the infrastructure for manufacture and launch of T-cell therapy Yescarta® for non-Hodgkin lymphoma.