X0306 4 2020-02-03 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 2020-02-03 4 S false 5900.00 27.0456 D 1131942.00 D Common Stock 2020-02-03 4 S false 600.00 27.48 D 1131342.00 D Common Stock 2020-02-04 4 S false 2409.00 26.71 D 1128933.00 D The sale of shares reported on this Form 4 was made pursuant to a Rule 10b5-1 trading plan adopted on December 5, 2019. This transaction was executed in multiple trades at prices ranging from $26.44 to $27.40. 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. The sales of shares reported on this Form 4 was made solely to cover tax obligations upon the vesting of 7,123 RSUs. Includes 39,815 shares of common stock that are subject to performance based vesting and 174,750 restricted stock units. /s/ Brian Keane, as Attorney-in-Fact 2020-02-05