X0306 4 2019-08-17 false 0001503274 Quanterix Corp QTRX 0001252546 HRUSOVSKY E KEVIN C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 true true false false Chairman, President & CEO Common Stock 2019-08-17 4 A false 10194.00 0.00 A 1181077.00 D Stock Option (right to buy) 30.45 2019-08-17 4 A false 40000.00 0.00 A 2029-08-17 Common Stock 40000.00 40000.00 D Represents shares of common stock issuable upon vesting of restricted stock units. The restricted stock units vested as to 1,061 shares immediately upon grant, and vest as to an additional 212.375 shares at the end of each month thereafter starting on August 31, 2019 for 43 months, subject to Mr. Hrusovsky's continued service as Chief Executive Officer. Includes 39,815 shares of common stock that are subject to performance based vesting and 218,549 restricted stock units. The option vested as to 4,166 shares immediately upon grant, and vests as to an additional 833.333 shares at the end of each month thereafter starting on August 31, 2019 for 43 months, subject to Mr. Hrusovsky's continued service as Chief Executive Officer. /s/ Brian Keane, as Attorney-in-Fact 2019-08-20