X0306 4 2015-06-12 0 0001492674 T2 Biosystems, Inc. TTOO 0001615992 Cima Michael J. 101 HARTWELL AVENUE LEXINGTON MA 02421 1 0 0 0 Common Stock 2015-06-12 4 P 0 1000 18.91 A 182018 D The price reported is a weighted average price. These shares were purchased in multiple transactions at per share prices ranging from $18.90 to $18.92. 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. /s/ Marc R. Jones, Attorney-in-fact 2015-06-16