X0306 4 2021-06-01 false 0001503274 Quanterix Corp QTRX 0001724565 Roskey Mark T. C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 false true false false SVP, Strategic Partnerships Common Stock 2021-06-01 4 S false 153.00 48.3181 D 24136.00 D The sales of shares reported on this Form 4 were made solely to cover tax obligations upon the vesting of 472 RSUs. This transaction was executed in multiple trades at prices ranging from $48.00 to $48.75. 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 13,765 restricted stock units. /s/ Brian Keane, Attorney-in-fact 2021-06-02