X0306 4 2019-03-12 false 0001503274 Quanterix Corp QTRX 0001252546 HRUSOVSKY E KEVIN C/O QUANTERIX CORPORATION, 113 HARTWELL AVENUE LEXINGTON MA 02421 true true false false Chairman, President & CEO Common Stock 2019-03-12 4 A false 31732.00 0.00 A 1189227.00 D Stock Option (right to buy) 22.69 2019-03-12 4 A false 108177.00 0.00 A 2029-03-12 Common Stock 108177.00 108177.00 D Represents shares of common stock issuable upon vesting of restricted stock units. The restricted stock units vest as to 1,983 of the shares on March 31, 2019 and vest as to an additional 661 shares at the end of each month thereafter for 44 months and as to 665 shares at the end of the 45th month thereafter. Includes 39,815 shares of common stock that are subject to performance based vesting and 244,232 restricted stock units. The option vests as to 25% of the shares on March 12, 2020 and vests as to an additional 2.083% of the shares per month for 36 months thereafter. /s/ Brian Keane, as Attorney-in-Fact 2019-03-18