X0306 4 2020-02-09 0 0001492674 T2 Biosystems, Inc. TTOO 0001615632 Lowery Thomas J. 101 HARTWELL AVE LEXINGTON MA 02421 0 1 0 0 Chief Scientific Officer Common Stock 2020-02-09 4 M 0 5833 A 68002 D Common Stock 2020-02-11 4 S 0 3200 0.77 D 64802 D Restricted Stock Units 2020-02-09 4 M 0 5833 0.00 A Common Stock 5833 0 D Each restricted stock units ("RSU's") represents a contingent right to receive one share of the Issuer's common stock. The transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 11, 2018. The price reported is a weighted average price. These shares were sold in multiple transactions at per share prices ranging from $0.77 to $0.78. The reporting person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. On February 9, 2017 the reporting person was granted 17,500 RSU's that vested in three equal annual installments beginning on February 9, 2018. /s/ John Sprague, Attorney-in-fact 2020-02-12