As of May 30, 2026, Quanterix's top three insider holders are David R Walt (Director, 1.87Mn shares), E Kevin Hrusovsky (Executive Chairman, 910.25K shares), Masoud Toloue (President Ceo, 507.31K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Paul M Meister | - | 313,253 | 0 | 07 Jan, 2026 |
| Goldman Myla Lai | - | 54,804 | 0 | 06 Jan, 2026 |
| David R Walt | - | 1,872,890 | 0 | 06 Jan, 2026 |
| William P Donnelly | Executive Chair | 154,127 | 0 | 03 Apr, 2026 |
| Keith Crandell | - | 131,236 | 0 | 04 Apr, 2023 |
| E Kevin Hrusovsky | Executive Chairman | 910,249 | 0 | 06 Jul, 2022 |
| Ivana Magovcevic-Liebisch | - | 43,607 | 0 | 06 Jan, 2026 |
| Michael A Doyle | Cfo And Treasurer | 88,332 | 0 | 02 Oct, 2023 |
| Martin D Madaus | - | 0 | 254,633 | 10 Aug, 2022 |
| John J Fry | General Counsel Secretary | 37,671 | 0 | 03 Aug, 2022 |
| Sarah E. Hlavinka | - | 60,070 | 0 | 03 Jul, 2025 |
| Brian J Blaser | - | 19,049 | 0 | 04 Jan, 2024 |
| Scott Mendel | - | 12,527 | 0 | 03 Apr, 2026 |
| Laurie J Olson | - | 13,738 | 0 | 14 May, 2024 |
| Karen Flynn | - | 57,212 | 0 | 06 Jan, 2026 |
| Jeffrey Thomas Elliott | - | 42,792 | 0 | 06 Jan, 2026 |
| Malcolm Garret Hampton | - | 70,099 | 0 | 06 Jan, 2026 |
| Mark T. Roskey | Svp, Strategic Partnerships | 22,325 | 0 | 05 Apr, 2022 |
| David C. Duffy | Svp Rd And Cto | 54,730 | 0 | 28 Mar, 2022 |
| Dawn Mattoon | Sr. Vp, Diagnostics | 36,876 | 0 | 05 Apr, 2022 |
| Masoud Toloue | President Ceo | 507,310 | 0 | 20 Jan, 2026 |
| Vandana Sriram | Chief Financial Officer | 28,713 | 0 | 16 Apr, 2026 |
| Alan Bruce Sachs | - | 70,099 | 0 | 06 Jan, 2026 |
| Michael Francis Miller | Chief Operating Officer | 32,522 | 0 | 16 Apr, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 15 Apr, 2026 | Michael Francis Miller | Common Stock | A | 81 | - | 31,512 | D | M |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | A | 263 | - | 27,691 | D | M |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | A | 263 | - | 27,691 | D | M |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | D | 79 | $3.60 | 27,612 | D | F |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | D | 79 | $3.60 | 27,612 | D | F |
| 15 Apr, 2026 | Michael Francis Miller | Common Stock | D | 25 | $3.60 | 31,487 | D | F |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | A | 514 | - | 28,126 | D | M |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | A | 514 | - | 28,126 | D | M |
| 15 Apr, 2026 | Michael Francis Miller | Common Stock | A | 136 | - | 31,623 | D | M |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | D | 154 | $3.60 | 27,972 | D | F |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | D | 154 | $3.60 | 27,972 | D | F |
| 15 Apr, 2026 | Michael Francis Miller | Common Stock | D | 41 | $3.60 | 31,582 | D | F |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | A | 1,056 | - | 29,028 | D | M |
| 15 Apr, 2026 | Michael Francis Miller | Common Stock | A | 135 | - | 31,717 | D | M |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | A | 1,056 | - | 29,028 | D | M |
| 15 Apr, 2026 | Michael Francis Miller | Common Stock | D | 41 | $3.60 | 31,676 | D | F |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | D | 315 | $3.60 | 28,713 | D | F |
| 15 Apr, 2026 | Vandana Sriram | Common Stock | D | 315 | $3.60 | 28,713 | D | F |
| 15 Apr, 2026 | Vandana Sriram | Restricted Stock Unit | D | 263 | $0.00 | 4,208 | D | M |
| 15 Apr, 2026 | Vandana Sriram | Restricted Stock Unit | D | 263 | $0.00 | 4,208 | D | M |