QTRX

SEC source: 0001908223-26-000008 · primarydocument.xml · nonDerivative · entry 1

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,691

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001207928-26-000004 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 154,127

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the first quarter of 2026.

SEC source: 0001515051-26-000002 · primarydocument.xml · nonDerivative · entry 1

Mendel Scott · CIK 0001515051 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,527

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the first quarter of 2026.

SEC source: 0002120516-26-000005 · primarydocument.xml · derivative · entry 6

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 679

Underlying: Common Stock · 130 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: 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 last day of each month thereafter.

F3 · derivative.expiration_date: 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 last day of each month thereafter.

SEC source: 0002120516-26-000005 · primarydocument.xml · derivative · entry 5

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 99 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: 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 last day of each month thereafter.

F2 · derivative.expiration_date: 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 last day of each month thereafter.

SEC source: 0002120516-26-000005 · primarydocument.xml · nonDerivative · entry 4

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,431

SEC source: 0002120516-26-000005 · primarydocument.xml · nonDerivative · entry 3

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,470

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0002120516-26-000005 · primarydocument.xml · nonDerivative · entry 2

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,340

SEC source: 0002120516-26-000005 · primarydocument.xml · nonDerivative · entry 1

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,370

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001908223-26-000007 · primarydocument.xml · derivative · entry 9

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,978

Underlying: Common Stock · 1,056 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: On February 4, 2025, the reporting person was granted 50,712 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.

F4 · derivative.expiration_date: On February 4, 2025, the reporting person was granted 50,712 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.

SEC source: 0001908223-26-000007 · primarydocument.xml · derivative · entry 8

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,825

Underlying: Common Stock · 514 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: On February 2, 2024, the reporting person was granted 24,675 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.

F3 · derivative.expiration_date: On February 2, 2024, the reporting person was granted 24,675 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.

SEC source: 0001908223-26-000007 · primarydocument.xml · derivative · entry 7

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,471

Underlying: Common Stock · 263 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: On August 21, 2023, the reporting person was granted 12,624 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.

F2 · derivative.expiration_date: On August 21, 2023, the reporting person was granted 12,624 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.

SEC source: 0001908223-26-000007 · primarydocument.xml · nonDerivative · entry 6

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,428

SEC source: 0001908223-26-000007 · primarydocument.xml · nonDerivative · entry 5

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,799

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001908223-26-000007 · primarydocument.xml · nonDerivative · entry 4

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,743

SEC source: 0001908223-26-000007 · primarydocument.xml · nonDerivative · entry 3

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,924

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001908223-26-000007 · primarydocument.xml · nonDerivative · entry 2

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,410

SEC source: 0001908223-26-000007 · primarydocument.xml · nonDerivative · entry 1

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,503

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0002120516-26-000004 · primarydocument.xml · derivative · entry 15

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,855

Underlying: Common Stock · 834 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_date: 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 · derivative.expiration_date: 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.

SEC source: 0002120516-26-000004 · primarydocument.xml · derivative · entry 14

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,689

Underlying: Common Stock · 372 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0002120516-26-000004 · primarydocument.xml · derivative · entry 13

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,116

Underlying: Common Stock · 135 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

SEC source: 0002120516-26-000004 · primarydocument.xml · derivative · entry 12

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,661

Underlying: Common Stock · 136 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

SEC source: 0002120516-26-000004 · primarydocument.xml · derivative · entry 11

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 922

Underlying: Common Stock · 81 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: 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.

F2 · derivative.expiration_date: 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.

SEC source: 0002120516-26-000004 · primarydocument.xml · nonDerivative · entry 10

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,271

SEC source: 0002120516-26-000004 · primarydocument.xml · nonDerivative · entry 9

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,564

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0002120516-26-000004 · primarydocument.xml · nonDerivative · entry 8

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,730

SEC source: 0002120516-26-000004 · primarydocument.xml · nonDerivative · entry 7

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,861

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0002120516-26-000004 · primarydocument.xml · nonDerivative · entry 6

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,489

SEC source: 0002120516-26-000004 · primarydocument.xml · nonDerivative · entry 5

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,537

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0002120516-26-000004 · primarydocument.xml · nonDerivative · entry 4

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,402

SEC source: 0002120516-26-000004 · primarydocument.xml · nonDerivative · entry 3

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,450

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0002120516-26-000004 · primarydocument.xml · nonDerivative · entry 2

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,314

SEC source: 0002120516-26-000004 · primarydocument.xml · nonDerivative · entry 1

Miller Michael Francis · CIK 0002120516 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,343

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001908223-26-000006 · primarydocument.xml · derivative · entry 8

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,339

Underlying: Common Stock · 514 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_date: On February 2, 2024, the reporting person was granted 24,675 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.

F6 · derivative.expiration_date: On February 2, 2024, the reporting person was granted 24,675 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.

SEC source: 0001908223-26-000006 · primarydocument.xml · derivative · entry 7

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,734

Underlying: Common Stock · 263 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: On August 21, 2023, the reporting person was granted 12,624 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.

F5 · derivative.expiration_date: On August 21, 2023, the reporting person was granted 12,624 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.

SEC source: 0001908223-26-000006 · primarydocument.xml · derivative · entry 6

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,905

Underlying: Common Stock · 74,905 shares

Expires not disclosed

F4 · derivative.exercise_date: The award vests in four equal annual installments on each of the first four anniversaries of the Transaction Date.

F4 · derivative.expiration_date: The award vests in four equal annual installments on each of the first four anniversaries of the Transaction Date.

SEC source: 0001908223-26-000006 · primarydocument.xml · derivative · entry 5

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,905

Underlying: Common Stock · 74,905 shares

Expires 2026-12-31

F3 · derivative.exercise_date: 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 Transaction Date.

SEC source: 0001908223-26-000006 · primarydocument.xml · nonDerivative · entry 4

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,240

SEC source: 0001908223-26-000006 · primarydocument.xml · nonDerivative · entry 3

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,332

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001908223-26-000006 · primarydocument.xml · nonDerivative · entry 2

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,069

SEC source: 0001908223-26-000006 · primarydocument.xml · nonDerivative · entry 1

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,248

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

F2 · balance_after: The total shown no longer includes 55,884 unvested RSUs which the reporting person previously reported in Table I of Form 4 and will hereafter report in Table II of Form 4.

SEC source: 0001908223-26-000004 · primarydocument.xml · nonDerivative · entry 1

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 81,618

F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon vesting of 12,678 restricted stock units (RSUs).

F2 · balance_after: Includes 55,884 RSUs

SEC source: 0001564777-26-000007 · wk-form4_1769030097.xml · derivative · entry 2

Cunningham Everett · CIK 0001564777 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,883,750

Underlying: Common Stock · 1,070,000 shares

Expires 2030-01-20

F2 · derivative.exercise_price: Each time-based RSU represents a contingent right to receive one share of the Issuer's common stock. The time-based RSUs vest as to one-fourth of the total number of shares on each of January 19, 2027, January 19, 2028, January 19, 2029 and January 19, 2030, except as provided for under Section 8(d) or 8(y) of the Employment Agreement by and between the Issuer and the Reporting Person dated January 8, 2026.

F2 · derivative.exercise_date: Each time-based RSU represents a contingent right to receive one share of the Issuer's common stock. The time-based RSUs vest as to one-fourth of the total number of shares on each of January 19, 2027, January 19, 2028, January 19, 2029 and January 19, 2030, except as provided for under Section 8(d) or 8(y) of the Employment Agreement by and between the Issuer and the Reporting Person dated January 8, 2026.

SEC source: 0001564777-26-000007 · wk-form4_1769030097.xml · derivative · entry 1

Cunningham Everett · CIK 0001564777 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 813,750

Underlying: Common Stock · 813,750 shares

Expires 2030-01-20

F1 · derivative.exercise_price: Each performance-based restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock. The performance-based RSUs vest upon the volume-weighted average price of the Issuer's common stock meeting certain thresholds within a four-year period, except as provided for under Section 8(y) of the Employment Agreement by and between the Issuer and the Reporting Person dated January 8, 2026.

F1 · derivative.exercise_date: Each performance-based restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock. The performance-based RSUs vest upon the volume-weighted average price of the Issuer's common stock meeting certain thresholds within a four-year period, except as provided for under Section 8(y) of the Employment Agreement by and between the Issuer and the Reporting Person dated January 8, 2026.

SEC source: 0001908223-26-000002 · primarydocument.xml · nonDerivative · entry 1

Sriram Vandana · CIK 0001908223 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 86,013

F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon vesting of 777 restricted stock units (RSUs).

F2 · balance_after: Includes 68,562 RSUs.

F3 · balance_after: QTRX year-end reconciliation revealed a variance of 310 shares. Corrected balance as shown

SEC source: 0001867276-26-000003 · primarydocument.xml · nonDerivative · entry 1

Toloue Masoud · CIK 0001867276 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 507,310

F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon vesting of 3,722 restricted stock units (RSUs).

F2 · balance_after: QTRX year-end reconciliation revealed a variance of 681 shares. Corrected balance as shown

F3 · balance_after: Includes 206,398 RSUs.

SEC source: 0001168581-26-000001 · primarydocument.xml · nonDerivative · entry 2

LAI GOLDMAN MYLA · CIK 0001168581 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 54,804

F3 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the fourth quarter of 2025.

F2 · balance_after: Includes 47,836 restricted stock units.

SEC source: 0001168581-26-000001 · primarydocument.xml · nonDerivative · entry 1

LAI GOLDMAN MYLA · CIK 0001168581 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,860

F1 · shares: Represents restricted stock units that vest as to 100% of the shares on January 2, 2027 granted pursuant to the Quanterix Corporation Amended and Restated Non-Employee Director Compensation Policy. Each restricted stock unit represents the right to receive one share of the Issuer's common stock.

F2 · balance_after: Includes 47,836 restricted stock units.

SEC source: 0001207928-26-000002 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,751

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the fourth quarter of 2025.

F2 · balance_after: Includes 2,802 restricted stock units.

SEC source: 0001205236-26-000001 · primarydocument.xml · nonDerivative · entry 1

WALT DAVID R · CIK 0001205236 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,872,890

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the fourth quarter of 2025.