SEC Form 4 · Updated Daily
QTRX
— QUANTERIX CORPORATION OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| NELSEN ROBERT | 10%+ Owner · Director | 2,182,995 | 2020-11-20 | J |
| BYBEE CLINTON | 10%+ Owner | 2,182,995 | 2020-11-20 | J |
| ARCH VENTURE FUND VI LP | 10%+ Owner | 2,182,995 | 2020-11-20 | J |
| ARCH VENTURE PARTNERS VI LP | 10%+ Owner | 2,182,995 | 2020-11-20 | J |
| ARCH VENTURE PARTNERS VI LLC | 10%+ Owner | 2,182,995 | 2020-11-20 | J |
| ARCH Venture Partners VIII, LLC | 10%+ Owner | 2,182,995 | 2020-11-20 | J |
| ARCH Venture Fund VIII Overage, L.P. | 10%+ Owner | 2,182,995 | 2020-11-20 | J |
| Agarwal Ajay | 10%+ Owner | 2,136,085 | 2017-12-11 | C |
| BAIN CAPITAL VENTURE INVESTORS, LLC | 10%+ Owner | 2,136,085 | 2017-12-11 | C |
| BCIP Associates III | 10%+ Owner · Director | 2,136,085 | 2017-12-11 | C |
| BCIP Associates III-B | 10%+ Owner · Director | 2,136,085 | 2017-12-11 | C |
| BCIP Associates III, LLC | 10%+ Owner · Director | 2,136,085 | 2017-12-11 | C |
| KRUPKA MICHAEL A | 10%+ Owner | 2,136,085 | 2017-12-11 | C |
| BCIP Associates III-B, LLC | 10%+ Owner | 2,136,085 | 2017-12-11 | C |
| BAIN CAPITAL VENTURE FUND 2005, L.P. | 10%+ Owner | 2,136,085 | 2017-12-11 | C |
| BAIN CAPITAL VENTURE PARTNERS 2005, L.P. | 10%+ Owner | 2,136,085 | 2017-12-11 | C |
| bioMerieux/ADR | 10%+ Owner | 2,055,632 | 2017-12-11 | C |
| AFEYAN NOUBAR | 10%+ Owner | 2,030,495 | 2017-12-11 | C |
| Flagship Ventures General Partner LLC | 10%+ Owner | 2,030,495 | 2017-12-11 | C |
| KANIA EDWIN M JR | 10%+ Owner | 2,030,495 | 2017-12-11 | C |
| Flagship Ventures Fund 2004 L P | 10%+ Owner | 2,030,495 | 2017-12-11 | C |
| WALT DAVID R | Director | 1,872,890 | 2026-01-02 | A |
| HRUSOVSKY E KEVIN | Director · Officer | 910,249 | 2022-07-05 | S |
| Toloue Masoud | Director · Officer | 507,310 | 2026-01-15 | F |
| MEISTER PAUL M | Director | 313,253 | 2026-01-02 | A |
| DONNELLY WILLIAM P | Director | 169,365 | 2026-10-01 | A |
| CRANDELL KEITH | 10%+ Owner | 131,236 | 2023-04-03 | A |
| DOYLE MICHAEL A | Officer | 88,332 | 2023-09-30 | F |
| Hampton Malcolm Garret | Director | 70,099 | 2026-01-02 | A |
| Sachs Alan Bruce | Director | 70,099 | 2026-01-02 | A |
| Hlavinka Sarah E. | Director | 60,070 | 2025-07-01 | A |
| Flynn Karen | Director | 57,212 | 2026-01-02 | A |
| Duffy David C. | Officer | 54,730 | 2022-03-23 | S |
| Orticerio Ernest | Officer | 48,802 | 2019-01-09 | M |
| Geist William | Officer | 44,951 | 2021-02-08 | A |
| Miller Michael Francis | Officer | 39,792 | 2026-10-15 | M |
| Fry John J | Officer | 37,671 | 2022-08-01 | S |
| Madaus Martin D | Director | 36,908 | 2025-01-02 | A |
| Mattoon Dawn | Officer | 36,876 | 2022-04-01 | S |
| Streeter Jackson | Officer | 32,515 | 2019-03-17 | A |
| Sriram Vandana | Officer | 31,598 | 2026-06-15 | M |
| Chaubal Amol | Officer | 30,310 | 2021-05-03 | S |
| Mendel Scott | Director | 28,454 | 2026-10-01 | A |
| Roskey Mark T. | Officer | 22,325 | 2022-04-01 | S |
| DRISCOLL JOSEPH | Officer | 19,388 | 2019-01-15 | M |
| Blaser Brian J | Director | 19,049 | 2024-01-02 | A |
| Magovcevic-Liebisch Ivana | Director | 15,883 | 2026-10-02 | M |
| Elliott Jeffrey Thomas | Director | 15,345 | 2026-08-19 | M |
| LAI GOLDMAN MYLA | Director | 15,041 | 2026-07-08 | M |
| DEKKERS MARIJN E | Director | 14,199 | 2021-06-04 | M |
| OLSON LAURIE J | Director | 13,738 | 2024-05-14 | S |
| Desjourdy Amee | Officer | 11,834 | 2019-08-19 | A |
| Connolly John M | Director | 9,510 | 2020-01-02 | A |
| BAL BRUCE J | Officer | 5,485 | 2018-05-10 | A |
| Stetson Shawn | Officer | 4,712 | 2021-05-11 | A |
| Cole Douglas G. | Director | 4,540 | 2019-01-02 | A |
| Meadows Benjamin | Officer | 3,500 | 2026-05-12 | P |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-10-15 | Miller Michael Francis | Option exercise (derivative) | 834 | $0.00 | 23,355 |
| 2026-10-15 | Miller Michael Francis | Option exercise (derivative) | 372 | $0.00 | 7,085 |
| 2026-10-15 | Miller Michael Francis | Option exercise (derivative) | 135 | $0.00 | 2,171 |
| 2026-10-15 | Miller Michael Francis | Option exercise (derivative) | 136 | $0.00 | 709 |
| 2026-10-15 | Miller Michael Francis | Option exercise (derivative) | 81 | $0.00 | 355 |
| 2026-10-15 | Miller Michael Francis | Tax withholding | 249 | $3.07 | 39,543 |
| 2026-10-15 | Miller Michael Francis | Option exercise | 834 | — | 39,792 |
| 2026-10-15 | Miller Michael Francis | Tax withholding | 111 | $3.07 | 38,958 |
| 2026-10-15 | Miller Michael Francis | Option exercise | 372 | — | 39,069 |
| 2026-10-15 | Miller Michael Francis | Tax withholding | 41 | $3.07 | 38,697 |
| 2026-10-15 | Miller Michael Francis | Option exercise | 135 | — | 38,738 |
| 2026-10-15 | Miller Michael Francis | Tax withholding | 41 | $3.07 | 38,603 |
| 2026-10-15 | Miller Michael Francis | Option exercise | 136 | — | 38,644 |
| 2026-10-15 | Miller Michael Francis | Tax withholding | 25 | $3.07 | 38,508 |
| 2026-10-15 | Miller Michael Francis | Option exercise | 81 | — | 38,533 |
| 2026-10-02 | Magovcevic-Liebisch Ivana | Option exercise (derivative) | 4,224 | $0.00 | 4,352 |
| 2026-10-02 | Magovcevic-Liebisch Ivana | Option exercise | 4,224 | — | 15,883 |
| 2026-10-01 | DONNELLY WILLIAM P | Grant / award | 6,964 | $3.41 | 169,365 |
| 2026-10-01 | Mendel Scott | Grant / award | 4,398 | $3.41 | 28,454 |
| 2026-09-15 | Gute James Edward Jr. | Grant / award (derivative) | 260,315 | $0.00 | 260,315 |
| 2026-09-15 | Miller Michael Francis | Option exercise (derivative) | 834 | $0.00 | 24,189 |
| 2026-09-15 | Miller Michael Francis | Option exercise (derivative) | 372 | $0.00 | 7,457 |
| 2026-09-15 | Miller Michael Francis | Option exercise (derivative) | 135 | $0.00 | 2,306 |
| 2026-09-15 | Miller Michael Francis | Option exercise (derivative) | 136 | $0.00 | 845 |
| 2026-09-15 | Miller Michael Francis | Option exercise (derivative) | 81 | $0.00 | 436 |
| 2026-09-15 | Miller Michael Francis | Tax withholding | 249 | $2.72 | 38,452 |
| 2026-09-15 | Miller Michael Francis | Option exercise | 834 | — | 38,701 |
| 2026-09-15 | Miller Michael Francis | Tax withholding | 111 | $2.72 | 37,867 |
| 2026-09-15 | Miller Michael Francis | Option exercise | 372 | — | 37,978 |
| 2026-09-15 | Miller Michael Francis | Tax withholding | 41 | $2.72 | 37,606 |
| 2026-09-15 | Miller Michael Francis | Option exercise | 135 | — | 37,647 |
| 2026-09-15 | Miller Michael Francis | Tax withholding | 41 | $2.72 | 37,512 |
| 2026-09-15 | Miller Michael Francis | Option exercise | 136 | — | 37,553 |
| 2026-09-15 | Miller Michael Francis | Tax withholding | 25 | $2.72 | 37,417 |
| 2026-09-15 | Miller Michael Francis | Option exercise | 81 | — | 37,442 |
| 2026-08-31 | Miller Michael Francis | Option exercise (derivative) | 159 | $0.00 | 0 |
| 2026-08-31 | Miller Michael Francis | Tax withholding | 48 | $2.67 | 37,361 |
| 2026-08-31 | Miller Michael Francis | Option exercise | 159 | — | 37,409 |
| 2026-08-19 | Elliott Jeffrey Thomas | Option exercise (derivative) | 3,955 | $0.00 | 4,075 |
| 2026-08-19 | Elliott Jeffrey Thomas | Option exercise | 3,955 | — | 15,345 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.