Quanterix Corp — Director's Dealing 2026

Mar 17, 2026

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: Quanterix Corp (QTRX)
CIK: 0001503274
Period of Report: 2026-02-23

Reporting Person: Miller Michael Francis (N/A)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	30262.00	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Performance Stock Unit	$0.00	2026-12-31	Common Stock (74905.00)		Direct
Restricted Stock Unit	$0.00		Common Stock (99.00)		Direct
Restricted Stock Unit	$0.00		Common Stock (809.00)		Direct
Restricted Stock Unit	$0.00		Common Stock (1003.00)		Direct
Restricted Stock Unit	$0.00		Common Stock (30027.00)		Direct
Restricted Stock Unit	$0.00		Common Stock (10061.00)		Direct
Restricted Stock Unit	$0.00		Common Stock (3251.00)		Direct
Restricted Stock Unit	$0.00		Common Stock (1797.00)		Direct
Restricted Stock Unit	$0.00		Common Stock (74905.00)		Direct
Stock Options (Right to buy)	$54.04	2031-07-28	Common Stock (11820.00)		Direct
Stock Options (Right to buy)	$29.62	2032-04-07	Common Stock (10543.00)		Direct
Stock Options (Right to buy)	$23.10	2034-02-02	Common Stock (21852.00)		Direct
Stock Options (Right to buy)	$16.78	2034-05-21	Common Stock (60123.00)		Direct
Stock Options (Right to buy)	$14.89	2033-02-06	Common Stock (9168.00)		Direct
Stock Options (Right to buy)	$11.89	2033-03-15	Common Stock (15320.00)		Direct
Stock Options (Right to buy)	$9.67	2032-09-23	Common Stock (14649.00)		Direct
Stock Options (Right to buy)	$8.43	2035-02-04	Common Stock (131147.00)		Direct

Footnotes

F1: 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

F10: 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.

F11: 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.

F12: 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.

F13: 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.

F14: 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.

F15: 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.

F16: 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.

F17: 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.

F2: 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.

F3: 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.

F4: 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.

F5: 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.

F6: 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.

F7: 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.

F8: 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.

F9: On February 15, 2026, the reporting person was granted 74,905 restricted stock units, vesting 25% per year for four years.