X0306 4 2018-06-28 0 0001492674 T2 Biosystems, Inc. TTOO 0001665000 Gibbs Michael Terrence 101 HARTWELL AVENUE LEXINGTON MA 02421 0 1 0 0 General Counsel Common Stock 2018-06-28 4 M 0 24086 0.00 A 50791 D On March 15, 2018, the reporting person was granted Performance Restricted Stock Units that vest in the form of common stock based upon the achievement of certain pre-established 90-day average daily closing prices per share goals over a three-year performance period. On June 28, 2018, the Compensation Committee of the Issuer's Board of Directors determined that the performance conditions had been met, resulting in the vesting of these shares. /s/ John Sprague, Attorney-in-Fact 2018-06-29