X0306 4 2019-11-12 false 0001503274 Quanterix Corp QTRX 0001310268 Madaus Martin D C/O QUANTERIX CORPORATION, 113 HARTWELL AVENUE LEXINGTON MA 02421 true false false false Common Stock 2019-11-12 4 M false 1600.00 1.93 A 8149.00 D Common Stock 2019-11-12 4 S false 1600.00 22.2771 D 6549.00 D Common Stock 2019-11-12 4 S false 2300.00 22.2322 D 222666.00 I See footnote Common Stock 2019-11-13 4 M false 1600.00 1.93 A 8149.00 D Common Stock 2019-11-13 4 S false 1600.00 22.04 D 6549.00 D Common Stock 2019-11-13 4 S false 2300.00 21.7815 D 220366.00 I See footnote Stock Option (Right to Buy) 1.93 2019-11-12 4 M false 1600.00 0.00 D 2021-01-05 Common Stock 1600.00 69707.00 D Stock Option (Right to Buy) 1.93 2019-11-13 4 M false 1600.00 0.00 D 2021-01-05 Common Stock 1600.00 68107.00 D All sales reported in this Form 4 were effected pursuant to Rule 10b5-1 trading plans adopted by the Reporting Person on September 9, 2019. This transaction was executed in multiple trades at prices ranging from $22.26 to $22.34. 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 $21.98 to $22.67. 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 for which the Reporting Person is a trust advisor who shares voting and investment control. This transaction was executed in multiple trades at prices ranging from $21.39 to $22.12. 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. All options are vested and exercisable. /s/ Brian Keane, Attorney-in-fact 2019-11-14