X0306 4 2021-02-08 false 0001503274 Quanterix Corp QTRX 0001731785 Mattoon Dawn C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 false true false false Sr. VP, Research Products Common Stock 2021-02-08 4 A false 3679.00 0.00 A 34513.00 D Stock Option (right to buy) 77.79 2021-02-08 4 A false 8585.00 0.00 A 2031-02-08 Common Stock 8585.00 8585.00 D Represents shares of stock issuable on vesting of restricted stock units. The restricted stock units vest as to 25% of the shares on February 8, 2022, and the remaining 75% vest in 36 equal monthly installments at the end of each month beginning on February 28, 2022. Includes 23,501 restricted stock units. The option vests as to 25% of the shares on February 8, 2022, and the remaining 75% vest in 36 equal monthly installments at the end of each month beginning on February 28, 2022. /s/ Brian Keane, as Attorney-in-Fact 2021-02-10