X0609 4 2026-07-15 false 0001503274 Quanterix Corp QTRX 0002141457 Faessler Jason F. false C/O QUANTERIX CORPORATION 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 false true false false Chief Financial Officer false Restricted Stock Unit 0.00 2026-07-15 4 A false 141820.00 0.00 A Common Stock 141820.00 141820.00 D On July 15, 2026, the reporting person was granted 141,820 restricted stock units. The RSUs vest in four equal annual installments on the first four anniversaries of the grant date, subject to the reporting person's continued employment with the issuer or one of its subsidiaries through the vesting dates. /s/ Meghan Shevlin, Attorney-in-Fact 2026-07-16