X0306 4 2020-06-01 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 2020-06-01 4 S false 3331.00 27.3184 D 1090137.00 D Common Stock 2020-06-03 4 S false 2700.00 27.8613 D 1087437.00 D Common Stock 2020-06-03 4 S false 2300.00 27.0637 D 1085137.00 D The sales of shares reported on this Form 4 were made solely to cover tax obligations upon the vesting of 7,123 RSUs. This transaction was executed in multiple trades at prices ranging from $26.98 to $27.75. 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 185,255 restricted stock units and 39,815 shares of common stock that are subject to performance based vesting. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan adopted on December 5, 2019. This transaction was executed in multiple trades at prices ranging from $27.60 to $28.045. 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. This transaction was executed in multiple trades at prices ranging from $26.60 to $27.57. 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. /s/ Brian Keane, as Attorney-in-Fact 2020-06-03