X0306 4 2022-08-10 false 0001503274 Quanterix Corp QTRX 0001310268 Madaus Martin D C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 true false false false Common Stock 2022-08-10 4 P false 89667.00 8.4261 A 254633.00 I See Footnote Common Stock 18443.00 D This transaction was executed in multiple trades at prices ranging from $8.195 to $8.61. 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. Held by a trust. Includes 2,668 restricted stock units. /s/ Brian Keane, Attorney-in-Fact 2022-08-10