Quanterix Corp (QTRX)
Who owns Quanterix Corp (QTRX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 81.7% of the shares are freely tradable; institutional investors hold 85.5%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Ameriprise Financial Inc | 7.52 | 3,542,374 | -29.1 | 03/31/2026 |
| BlackRock Inc | 6.96 | 3,277,595 | -2.9 | 03/31/2026 |
| Portolan Capital Management, LLC | 6.25 | 2,945,823 | -34.9 | 03/31/2026 |
| Vanguard Group Inc | 5.68 | 2,677,833 | +1.1 | 12/31/2025 |
| Blue Water Life Science Advisors, LLC | 4.55 | 2,142,147 | +2.4 | 03/31/2026 |
| William Blair Investment Management, LLC | 4.42 | 2,083,699 | +1.8 | 03/31/2026 |
| Invenomic Capital Management, LP | 4.10 | 1,932,386 | +28.4 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.79 | 1,784,613 | +0.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| First Eagle Small Cap Opportunity I | 4.10 | 1,929,311 | +36.7 | 05/31/2026 |
| Strategic Advisers U.S. Total Stock | 3.71 | 1,745,618 | +8.6 | 04/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 15. Jul 2026 | Miller Michael Francis | Chief Technology Officer | Other | 249 | 4.24 | 1,056 |
| 15. Jul 2026 | Miller Michael Francis | Chief Technology Officer | Other | 834 | – | – |
| 15. Jul 2026 | Miller Michael Francis | Chief Technology Officer | Other | 111 | 4.24 | 471 |
| 15. Jul 2026 | Miller Michael Francis | Chief Technology Officer | Other | 372 | – | – |
| 15. Jul 2026 | Miller Michael Francis | Chief Technology Officer | Other | 135 | – | – |
| 15. Jul 2026 | Miller Michael Francis | Chief Technology Officer | Other | 41 | 4.24 | 174 |
| 15. Jul 2026 | Miller Michael Francis | Chief Technology Officer | Other | 136 | – | – |
| 15. Jul 2026 | Miller Michael Francis | Chief Technology Officer | Other | 25 | 4.24 | 106 |
| 15. Jul 2026 | Miller Michael Francis | Chief Technology Officer | Other | 81 | – | – |
| 8. Jul 2026 | Mendel Scott | Director | Other | 8,073 | – | – |
| 8. Jul 2026 | Lai Goldman Myla | Director | Other | 8,073 | – | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.