X0306 4 2020-08-06 0 0001492674 T2 Biosystems, Inc. TTOO 0001815499 Saunders Ninfa 101 HARTWELL AVE LEXINGTON MA 02421 1 0 0 0 Restricted Stock Units 2020-08-06 4 A 0 68181 0.00 A Common Stock 68181 68181 D Each restricted stock unit represents a contingent right to receive one share of Issuer's common stock. The restricted stock units vest and become exercisable in substantially equal installments on each of the first three anniversaries of the date of grant. /s/ John Sprague, Attorney-in-fact 2020-08-07