MPM SunStates Fund, L.P., Ten Percent Owner at TCR2 Therapeutics, holds 4.05M shares in TCR2 Therapeutics (Ticker: TCRR). Most recently, MPM SunStates Fund, L.P. Bought $706,666 shares of TCR2 Therapeutics on Feb 21, 2019 for an estimated value of 10.60M.