X0306 4 2018-12-14 false 0001503274 Quanterix Corp QTRX 0001724369 Orticerio Ernest C/O QUANTERIX CORPORATION, 113 HARTWELL AVENUE LEXINGTON MA 02421 false true false false SVP Finance and Corporate Dev Common Stock 2018-12-14 4 S false 25000.00 19.4905 D 28802.00 D This transaction was executed in multiple trades at prices ranging from $19.49 to $19.50. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. Includes 7,131 shares of common stock issuable upon vesting of restricted stock units that vest as to 25% of the shares on May 10, 2019 and as to an additional 2.083% of the shares per month for 36 months thereafter. /s/ Brian Keane, as Attorney-in-Fact 2018-12-14