X0306 4 2020-04-27 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 2020-04-27 4 S false 2200.00 26.7147 D 167566.00 I See footnote Common Stock 2020-04-27 4 S false 100.00 26.67 D 167466.00 I See footnote Common Stock 2020-04-28 4 M false 3200.00 1.93 A 13745.00 D Common Stock 2020-04-28 4 S false 3200.00 26.2583 D 10545.00 D Common Stock 2020-04-28 4 S false 2200.00 25.9546 D 165266.00 I See footnote Common Stock 2020-04-28 4 S false 300.00 26.786 D 164966.00 I See footnote Stock Option (Right to Buy) 1.93 2020-04-28 4 M false 3200.00 0.00 D 2021-01-05 Common Stock 3200.00 29707.00 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 $26.395 to $27.25. 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. Includes 2,270 Restricted Stock Units. This transaction was executed in multiple trades at prices ranging from $25.924 to $26.56. 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 $25.44 to $26.425. 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 $26.51 to $27.28. 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 2020-04-29