X0306 4 2019-10-21 false 0001503274 Quanterix Corp QTRX 0001724566 Duffy David C. C/O QUANTERIX CORPORATION, 113 HARTWELL AVENUE LEXINGTON MA 02421 false true false false SVP R&D and CTO Common Stock 2019-10-21 4 M false 1667.00 1.93 A 46427.00 D Common Stock 2019-10-21 4 S false 1667.00 20.3196 D 44760.00 D Stock Option (Right to Buy) 1.93 2019-10-21 4 M false 1667.00 0.00 D 2021-07-06 Common Stock 1667.00 5275.00 D The sale of shares reported on this Form 4 was made pursuant to a Rule 10b5-1 trading plan adopted on May 16, 2019. This transaction was executed in multiple trades at prices ranging from $20.28 to $20.36. 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 9,177 restricted stock units. Option is fully vested. /s/ Brian Keane, Attorney-in-fact 2019-10-21