Quanterix (QTRX)
Builds Simoa and spatial biology tools for ultra-sensitive biomarker research and diagnostics.
$3.14
vs last close−0.05 (−1.43%)
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13F · 13D/G · Form 4
| Institutions | ≈ 62.87% | 29.73M shares | |
|---|---|---|---|
| 136 holders · as of Jun 30, 2026 · largest filers plus last quarter's tail | |||
| Insiders | 3.27% | 1.55M shares | |
| 15 holders · as of Sep 16, 2026 | |||
| Strategic holders | 6.67% | 3.15M shares | |
| 1 holder · as of Feb 11, 2022 | |||
| Other | ≈ 27.19% | 12.86M shares | |
| remainder | |||
47.29M company shares as of Sep 23, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.
13F, as of Jun 30, 2026
136 holders · 29.73M shares · 38 new positions · 82 increased · 30 reduced · 31 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 3.64M | 7.69% | +357.8K | Aug 7, 2026 |
| Blue Water Life Science Advisors, LP | 3.47M | 7.35% | +1.33M | Aug 14, 2026 |
| First Eagle Investment Management, LLC | 2.75M | 5.82% | +1.45M | Aug 24, 2026 |
| Portolan Capital Management, LLC | 1.90M | 4.02% | −1.05M | Aug 14, 2026 |
| Vanguard Capital Management LLC | 1.80M | 3.81% | +16.0K | Aug 13, 2026 |
| Lionhunter Capital Management, LLC | 1.50M | 3.17% | +1.50Mnew | Aug 13, 2026 |
| AQR Capital Management LLC | 1.34M | 2.84% | +1.26M | Aug 14, 2026 |
| Geode Capital Management, LLC | 1.13M | 2.39% | +136.6K | Aug 12, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Ameriprise Financial, Inc. | 7.50% | 3.54M | 13G | May 15, 2026 |
| BlackRock, Inc. | 7.30% | 2.84M | 13G | Jul 17, 2025 |
| Portolan Capital Management, LLC | 6.25% | 2.95M | 13G | May 15, 2026 |
| Telegraph Hill Partners III, L.P. | 5.40% | 2.50M | 13G | Nov 19, 2025 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 13, 2026 | William P. Donnellydirector | Purchase | 72,245 | $2.93 | 99,400 |
| Aug 12, 2026 | William P. Donnellydirector | Purchase | 27,155 | $2.75 | 27,155 |
| May 12, 2026 | Benjamin Meadowsofficer: Chief Commercial Officer | Purchase | 3,500 | $2.77 | 3,500 |
House and Senate disclosures
Not reported.