X0206 3 2026-02-23 0 0001503274 Quanterix Corp QTRX 0002120516 Miller Michael Francis C/O QUANTERIX CORPORATION 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 false true false false Chief Operating Officer Common Stock 30262.00 D Performance Stock Unit 0.00 2026-12-31 Common Stock 74905.00 D Restricted Stock Unit 0.00 Common Stock 99.00 D Restricted Stock Unit 0.00 Common Stock 809.00 D Restricted Stock Unit 0.00 Common Stock 1003.00 D Restricted Stock Unit 0.00 Common Stock 30027.00 D Restricted Stock Unit 0.00 Common Stock 10061.00 D Restricted Stock Unit 0.00 Common Stock 3251.00 D Restricted Stock Unit 0.00 Common Stock 1797.00 D Restricted Stock Unit 0.00 Common Stock 74905.00 D Stock Options (Right to buy) 54.04 2031-07-28 Common Stock 11820.00 D Stock Options (Right to buy) 29.62 2032-04-07 Common Stock 10543.00 D Stock Options (Right to buy) 23.10 2034-02-02 Common Stock 21852.00 D Stock Options (Right to buy) 16.78 2034-05-21 Common Stock 60123.00 D Stock Options (Right to buy) 14.89 2033-02-06 Common Stock 9168.00 D Stock Options (Right to buy) 11.89 2033-03-15 Common Stock 15320.00 D Stock Options (Right to buy) 9.67 2032-09-23 Common Stock 14649.00 D Stock Options (Right to buy) 8.43 2035-02-04 Common Stock 131147.00 D On February 15, 2026, the reporting person was granted 74,905 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 July 28, 2021, the reporting person was granted 11,820 stock options, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the final day of each month thereafter. On April 7, 2022, the reporting person was granted 10,543 stock options, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the final day of each month thereafter. On February 2, 2024, the reporting person was granted 21,852 stock options, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the final day of each month thereafter. On May 21, 2024, the reporting person was granted 60,123 stock options, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the final day of each month thereafter. On February 6, 2023, the reporting person was granted 9,168 stock options, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the final day of each month thereafter. On March 15, 2023, the reporting person was granted 15,320 stock options, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the final day of each month thereafter. On September 23, 2022, the reporting person was granted 14,649 stock options, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the final day of each month thereafter. On February 4, 2025, the reporting person was granted 131,147 stock options, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the final day of each month thereafter. On April 7, 2022, the reporting person was granted 4,518 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 final day of each month thereafter. On September 23, 2022, the reporting person was granted 6,278 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 final day of each month thereafter. On February 6, 2023, the reporting person was granted 3,929 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 February 4, 2025, the reporting person was granted 40,036 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 May 21, 2024, the reporting person was granted 17,878 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 February 2, 2024, the reporting person was granted 6,494 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 March 15, 2023, the reporting person was granted 6,566 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 February 15, 2026, the reporting person was granted 74,905 restricted stock units, vesting 25% per year for four years. /s/ Bonnie McManus, Attorney-in-Fact 2026-03-05