QTRX Quanterix Corporation
Quanterix Corporation (QTRX) Institutional Ownership
What the institutions did with QTRX last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| First Eagle Investment Management, LLC | 5.5M | 17.1% |
| BlackRock, Inc. | 3.6M | 11.3% |
| Blue Water Life Science Advisors, LP | 3.5M | 10.8% |
| Portolan Capital Management, LLC | 1.9M | 5.9% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.8M | 5.6% |
| Lionhunter Capital Management, LLC | 1.5M | 4.7% |
| AQR CAPITAL MANAGEMENT LLC | 1.3M | 4.2% |
| GEODE CAPITAL MANAGEMENT, LLC | 1.1M | 3.5% |
| AMERIPRISE FINANCIAL INC | 987.4K | 3.1% |
| MARSHALL WACE, LLP | 973.9K | 3.0% |
| STATE STREET CORP | 932.3K | 2.9% |
| Tikvah Management LLC | 571.6K | 1.8% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 489.6K | 1.5% |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 487.6K | 1.5% |
| MORGAN STANLEY | 447.7K | 1.4% |
| JANE STREET GROUP, LLC | 419.1K | 1.3% |
| GSA CAPITAL PARTNERS LLP | 410.3K | 1.3% |
| TUDOR INVESTMENT CORP ET AL | 400.4K | 1.2% |
| DIMENSIONAL FUND ADVISORS LP | 397.8K | 1.2% |
| NORTHERN TRUST CORP | 337.2K | 1.0% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 310.7K | 1.0% |
| VANGUARD FIDUCIARY TRUST CO | 288.3K | 0.9% |
| UBS Group AG | 282.0K | 0.9% |
| Nuveen, LLC | 232.6K | 0.7% |
| CITADEL ADVISORS LLC | 229.7K | 0.7% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| First Eagle Investment Management, LLC | Increased | 1.3M | 5.5M | +4.2M |
| AMERIPRISE FINANCIAL INC | Reduced | 3.5M | 987.4K | -2.6M |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | Sold Out | 2.1M | 0 | -2.1M |
| Invenomic Capital Management LP | Sold Out | 1.9M | 0 | -1.9M |
| LEVIN CAPITAL STRATEGIES, L.P. | Sold Out | 1.5M | 0 | -1.5M |
| Blue Water Life Science Advisors, LP | Increased | 2.1M | 3.5M | +1.3M |
| AQR CAPITAL MANAGEMENT LLC | Increased | 84.1K | 1.3M | +1.3M |
| Portolan Capital Management, LLC | Reduced | 2.9M | 1.9M | -1.0M |
| Trium Capital LLP | Sold Out | 994.2K | 0 | -994.2K |
| Empire Financial Management Company, LLC | Sold Out | 736.1K | 0 | -736.1K |
| ENVESTNET ASSET MANAGEMENT INC | Sold Out | 682.7K | 0 | -682.7K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 689.2K | 40.7K | -648.5K |
| Williams Jones Wealth Management, LLC. | Sold Out | 613.4K | 0 | -613.4K |
| Russell Investments Group, Ltd. | Reduced | 642.0K | 37.7K | -604.3K |
| Topline Capital Management, LLC | Sold Out | 563.1K | 0 | -563.1K |
| Pier Capital, LLC | Sold Out | 492.4K | 0 | -492.4K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | New | 0 | 487.6K | +487.6K |
| BlackRock, Inc. | Increased | 3.3M | 3.6M | +357.8K |
| MARSHALL WACE, LLP | Increased | 622.4K | 973.9K | +351.5K |
| Parkman Healthcare Partners LLC | Sold Out | 341.5K | 0 | -341.5K |
| GSA CAPITAL PARTNERS LLP | Increased | 95.5K | 410.3K | +314.7K |
| JANE STREET GROUP, LLC | Increased | 155.7K | 419.1K | +263.4K |
| ROYAL BANK OF CANADA | Reduced | 232.1K | 1.5K | -230.6K |
| CITADEL ADVISORS LLC | Increased | 61.0K | 229.7K | +168.7K |
| Nuveen, LLC | Increased | 71.8K | 232.6K | +160.8K |
| MORGAN STANLEY | Reduced | 607.9K | 447.7K | -160.2K |
| Susquehanna Portfolio Strategies, LLC | New | 0 | 148.6K | +148.6K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 994.8K | 1.1M | +136.6K |
| RENAISSANCE TECHNOLOGIES LLC | Sold Out | 136.2K | 0 | -136.2K |
| Point72 Asset Management, L.P. | Increased | 93.3K | 225.7K | +132.4K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 50.7K | 168.6K | +117.9K |
| XTX Topco Ltd | Increased | 111.7K | 228.0K | +116.4K |
| UBS Group AG | Reduced | 377.0K | 282.0K | -95.0K |
| Brevan Howard Capital Management LP | Sold Out | 87.4K | 0 | -87.4K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 576.6K | 489.6K | -87.0K |
| TUDOR INVESTMENT CORP ET AL | Increased | 316.0K | 400.4K | +84.4K |
| STATE OF WISCONSIN INVESTMENT BOARD | Sold Out | 84.1K | 0 | -84.1K |
| Quadrature Capital Ltd | New | 0 | 80.2K | +80.2K |
| Cerity Partners LLC | New | 0 | 78.1K | +78.1K |
| HRT FINANCIAL LP | Sold Out | 71.7K | 0 | -71.7K |
| Clearstead Advisors, LLC | Reduced | 124.1K | 62.3K | -61.9K |
| GOLDMAN SACHS GROUP INC | Reduced | 270.2K | 212.1K | -58.1K |
| Jain Global LLC | New | 0 | 57.3K | +57.3K |
| Dynamic Technology Lab Private Ltd | Reduced | 77.9K | 20.8K | -57.1K |
| ALGERT GLOBAL LLC | New | 0 | 55.2K | +55.2K |
| PDT Partners, LLC | Sold Out | 47.7K | 0 | -47.7K |
| Quantinno Capital Management LP | Sold Out | 47.6K | 0 | -47.6K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 443.1K | 397.8K | -45.3K |
| Invesco Ltd. | Increased | 116.2K | 160.9K | +44.7K |
| FOX RUN MANAGEMENT, L.L.C. | Sold Out | 39.6K | 0 | -39.6K |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | New | 0 | 39.0K | +39.0K |
| CANADA PENSION PLAN INVESTMENT BOARD | New | 0 | 38.1K | +38.1K |
| IEQ CAPITAL, LLC | New | 0 | 35.5K | +35.5K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Reduced | 345.9K | 310.7K | -35.2K |
| TWO SIGMA INVESTMENTS, LP | Sold Out | 35.2K | 0 | -35.2K |
| STATE STREET CORP | Increased | 898.3K | 932.3K | +34.0K |
| Schonfeld Strategic Advisors LLC | Reduced | 42.8K | 12.7K | -30.1K |
| FMR LLC | Increased | 183.4K | 210.6K | +27.3K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 68.4K | 95.6K | +27.3K |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | New | 0 | 26.9K | +26.9K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.