CSTL Castle Biosciences, Inc.
Castle Biosciences, Inc. (CSTL) Institutional Ownership
What the institutions did with CSTL 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.
Sign in or subscribeOwnership map
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 |
|---|---|---|
| BlackRock, Inc. | 3.3M | 12.0% |
| RTW INVESTMENTS, LP | 2.8M | 10.1% |
| PRINCIPAL FINANCIAL GROUP INC | 1.7M | 6.3% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.2M | 4.5% |
| ACADIAN ASSET MANAGEMENT LLC | 918.7K | 3.4% |
| Allianz Asset Management GmbH | 879.3K | 3.2% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 840.8K | 3.1% |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | 824.9K | 3.0% |
| STATE STREET CORP | 822.1K | 3.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 795.9K | 2.9% |
| MACKENZIE FINANCIAL CORP | 793.5K | 2.9% |
| DIMENSIONAL FUND ADVISORS LP | 791.1K | 2.9% |
| Jefferies Financial Group Inc. | 647.4K | 2.4% |
| Qube Research & Technologies Ltd | 589.3K | 2.2% |
| AIGH Capital Management LLC | 545.1K | 2.0% |
| RENAISSANCE TECHNOLOGIES LLC | 371.2K | 1.4% |
| GOLDMAN SACHS GROUP INC | 358.4K | 1.3% |
| Point72 Asset Management, L.P. | 357.3K | 1.3% |
| KENNEDY CAPITAL MANAGEMENT LLC | 348.4K | 1.3% |
| Connor, Clark & Lunn Investment Management Ltd. | 331.7K | 1.2% |
| MORGAN STANLEY | 329.7K | 1.2% |
| Portolan Capital Management, LLC | 328.8K | 1.2% |
| PANAGORA ASSET MANAGEMENT INC | 301.0K | 1.1% |
| Allspring Global Investments Holdings, LLC | 292.5K | 1.1% |
| NORTHERN TRUST CORP | 285.2K | 1.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Portolan Capital Management, LLC | Reduced | 1.4M | 328.8K | -1.0M |
| MACKENZIE FINANCIAL CORP | Increased | 74.1K | 793.5K | +719.4K |
| Jefferies Financial Group Inc. | New | 0 | 647.4K | +647.4K |
| ACADIAN ASSET MANAGEMENT LLC | Increased | 484.4K | 918.7K | +434.2K |
| EVENTIDE ASSET MANAGEMENT, LLC | Sold Out | 386.4K | 0 | -386.4K |
| Point72 Asset Management, L.P. | New | 0 | 357.3K | +357.3K |
| KENNEDY CAPITAL MANAGEMENT LLC | New | 0 | 348.4K | +348.4K |
| BlackRock, Inc. | Increased | 3.0M | 3.3M | +309.0K |
| PALISADE CAPITAL MANAGEMENT, LP | Reduced | 535.9K | 231.9K | -304.0K |
| SCHRODER INVESTMENT MANAGEMENT GROUP | Sold Out | 298.9K | 0 | -298.9K |
| Nuveen, LLC | Reduced | 522.1K | 231.7K | -290.4K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 1.0M | 791.1K | -248.7K |
| SG Americas Securities, LLC | Sold Out | 244.9K | 0 | -244.9K |
| TUDOR INVESTMENT CORP ET AL | Reduced | 223.0K | 14.5K | -208.5K |
| WASATCH ADVISORS LP | Reduced | 455.0K | 279.3K | -175.7K |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 532.8K | 371.2K | -161.6K |
| TWO SIGMA INVESTMENTS, LP | Reduced | 248.8K | 100.4K | -148.5K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 353.3K | 205.4K | -148.0K |
| FIRST TRUST ADVISORS LP | New | 0 | 145.1K | +145.1K |
| CITADEL ADVISORS LLC | Increased | 121.0K | 265.4K | +144.4K |
| Campbell & CO Investment Adviser LLC | Reduced | 148.8K | 16.5K | -132.3K |
| Allspring Global Investments Holdings, LLC | Increased | 160.7K | 292.5K | +131.8K |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | Reduced | 940.7K | 824.9K | -115.8K |
| AQR CAPITAL MANAGEMENT LLC | Increased | 64.9K | 166.6K | +101.7K |
| HRT FINANCIAL LP | Increased | 15.9K | 115.9K | +100.0K |
| MORGAN STANLEY | Reduced | 428.9K | 329.7K | -99.3K |
| D. E. Shaw & Co., Inc. | Reduced | 212.0K | 112.8K | -99.2K |
| PANAGORA ASSET MANAGEMENT INC | Increased | 222.4K | 301.0K | +78.7K |
| Trexquant Investment LP | Increased | 130.4K | 206.1K | +75.7K |
| Allianz Asset Management GmbH | Increased | 811.3K | 879.3K | +67.9K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 728.1K | 795.9K | +67.8K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Increased | 27.1K | 92.7K | +65.6K |
| Man Group plc | Increased | 47.1K | 108.8K | +61.6K |
| STATE STREET CORP | Increased | 769.1K | 822.1K | +53.0K |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | 122.2K | 69.6K | -52.6K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 1.2M | 1.2M | +49.0K |
| FORMULA GROWTH LTD | Sold Out | 46.0K | 0 | -46.0K |
| AIGH Capital Management LLC | Reduced | 590.6K | 545.1K | -45.5K |
| Connor, Clark & Lunn Investment Management Ltd. | Reduced | 377.1K | 331.7K | -45.4K |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 1.8M | 1.7M | -43.2K |
| UBS Group AG | Increased | 49.2K | 89.4K | +40.2K |
| SEI INVESTMENTS CO | Increased | 35.0K | 74.4K | +39.4K |
| NOMURA HOLDINGS INC | Sold Out | 35.7K | 0 | -35.7K |
| ALGERT GLOBAL LLC | Increased | 34.8K | 70.5K | +35.7K |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | Reduced | 255.2K | 221.3K | -33.8K |
| ExodusPoint Capital Management, LP | Sold Out | 32.6K | 0 | -32.6K |
| Corient Private Wealth LP | Sold Out | 31.9K | 0 | -31.9K |
| BANK OF AMERICA CORP /DE/ | Increased | 67.8K | 98.7K | +30.9K |
| Qube Research & Technologies Ltd | Increased | 559.6K | 589.3K | +29.7K |
| Quantinno Capital Management LP | Reduced | 45.5K | 16.4K | -29.0K |
| FOX RUN MANAGEMENT, L.L.C. | Sold Out | 26.2K | 0 | -26.2K |
| Magnetar Financial LLC | Sold Out | 23.3K | 0 | -23.3K |
| Schonfeld Strategic Advisors LLC | Reduced | 42.4K | 19.9K | -22.5K |
| Russell Investments Group, Ltd. | Increased | 9.3K | 31.7K | +22.4K |
| Tidal Investments LLC | New | 0 | 22.2K | +22.2K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 861.8K | 840.8K | -21.0K |
| RTW INVESTMENTS, LP | Increased | 2.8M | 2.8M | +20.0K |
| XTX Topco Ltd | Increased | 20.3K | 39.9K | +19.6K |
| Quantbot Technologies LP | Reduced | 22.1K | 2.6K | -19.5K |
| Parkman Healthcare Partners LLC | Increased | 126.2K | 144.8K | +18.6K |
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.