X0206 3 2019-02-13 0 0001750019 TCR2 THERAPEUTICS INC. TCRR 0001362054 Baeuerle Patrick TCR2 THERAPEUTICS INC. 100 BINNEY STREET CAMBRIDGE MA 02142 1 0 0 0 Common Stock 244878 I By APAK Solutions GmbH Common Stock 53452 I By APAK Solutions GmbH Common Stock 169385 I By APAK Solutions GmbH The shares are subject to a Stock Restriction Agreement dated June 1, 2015. The shares subject to the Stock Restriction Agreement shall vest in 48 equal monthly installments beginning on June 1, 2015. The shares are subject to a Stock Restriction Agreement dated May 9, 2017. The shares subject to the Stock Restriction Agreement shall vest in 36 equal monthly installments beginning on December 13, 2016. The shares are subject to a Stock Restriction Agreement dated December 15, 2017. 25% of the shares vested on the first anniversary of the vesting start date of December 6, 2016, with the remainder vesting in 36 equal quarterly installments thereafter. The reported securities are owned directly by APAK Solutions GmbH. The Reporting Person is managing director of APAK Solutions GmbH. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein. Exhibit 24.1: Power of Attorney /s/ Patrick Baeuerle 2019-02-13