Quanterix Corporation (QTRX) ownership: Top institutional holder: VANGUARD GROUP INC ($17.03M). Insider activity: Net Seller (1 buys, 19 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 2677833.00 | $17.03M | 2025-12-31 |
| AMERIPRISE FINANCIAL INC | 3542374.00 | $12.47M | 2026-03-31 |
| BlackRock, Inc. | 3277595.00 | $11.54M | 2026-03-31 |
| Portolan Capital Management, LLC | 2945823.00 | $10.37M | 2026-03-31 |
| Blue Water Life Science Advisors, LP | 2142147.00 | $7.54M | 2026-03-31 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 2083699.00 | $7.33M | 2026-03-31 |
| Invenomic Capital Management LP | 1932386.00 | $6.80M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 1784613.00 | $6.28M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.