X0607 3 2026-02-23 0 0001503274 Quanterix Corp QTRX 0001757122 Char Daniel false C/O QUANTERIX CORPORATION 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 false true false false Chief Legal Officer Restricted Stock Unit 0.00 Common Stock 33962.00 D Stock Options (Right to buy) 7.95 2036-01-15 Common Stock 113171.00 D On January 15, 2026, the reporting person was granted 33,962 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the 15th day of each month thereafter. On January 15, 2026, the reporting person was granted 113,171 stock options, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the 15th day of each month thereafter. /s/ Bonnie McManus, Attorney-in-Fact 2026-03-24