X0306 4 2021-11-10 false 0001503274 Quanterix Corp QTRX 0001252546 HRUSOVSKY E KEVIN C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 true true false false Chairman and CEO Common Stock 2021-11-10 4 S false 900.00 54.0539 D 901911.00 D Common Stock 2021-11-10 4 S false 3700.00 55.3681 D 898211.00 D Common Stock 2021-11-10 4 S false 400.00 55.9675 D 897811.00 D The sale of shares was effected pursuant to a 10b5-1 trading plan adopted on December 14, 2020. This transaction was executed in multiple trades at prices ranging from $53.73 to $54.44. 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 65,504 restricted stock units and 39,815 shares of common stock that are subject to performance based vesting. This transaction was executed in multiple trades at prices ranging from $54.76 to $55.755. 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 $55.93 to $56.015. 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 2021-11-10