X0607 3 2026-02-23 0 0001503274 Quanterix Corp QTRX 0002140394 Meadows Benjamin false C/O QUANTERIX CORPORATION 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 false true false false Chief Commercial Officer Performance Stock Unit 0.00 2026-12-31 Common Stock 70223.00 D Restricted Stock Unit 0.00 Common Stock 70223.00 D Restricted Stock Unit 0.00 Common Stock 22959.00 D Stock Options (Right to buy) 5.88 2035-10-06 Common Stock 76234.00 D On February 15, 2026, the reporting person was granted 70,223 Performance Stock Units, with each PSU award to vest (subject to the employee's continued service to the Company on the applicable vesting dates) according to the schedule and conditions set forth in the executive long-term incentive plan contained in the Company's 2026 Employee Equity Guidelines. After the award's performance conditions are satisfied, the PSUs will vest in four equal annual installments on each of the first four anniversaries of the grant date On February 15, 2026, the reporting person was granted 70,223 restricted stock units, vesting 25% per year for four years. On October 6, 2025, the reporting person was granted 22,959 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 October 6, 2025, the reporting person was granted 76,234 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/ Meghan Shevlin, Attorney-in-Fact 2026-06-12