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 September 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 |
|---|---|---|
| PRINCIPAL FINANCIAL GROUP INC | 1.5M | 37.9% |
| DIMENSIONAL FUND ADVISORS LP | 692.1K | 17.5% |
| MACKENZIE FINANCIAL CORP | 568.4K | 14.4% |
| WASATCH ADVISORS LP | 279.3K | 7.1% |
| KORNITZER CAPITAL MANAGEMENT INC /KS | 264.8K | 6.7% |
| Allspring Global Investments Holdings, LLC | 245.0K | 6.2% |
| PERKINS CAPITAL MANAGEMENT INC | 49.3K | 1.2% |
| KBC Group NV | 36.0K | 0.9% |
| STRS OHIO | 30.7K | 0.8% |
| HARBOR CAPITAL ADVISORS, INC. | 26.1K | 0.7% |
| TRUIST FINANCIAL CORP | 23.5K | 0.6% |
| First Bank & Trust | 18.4K | 0.5% |
| Inspire Investing, LLC | 18.0K | 0.5% |
| Creative Planning | 17.5K | 0.4% |
| DekaBank Deutsche Girozentrale | 15.8K | 0.4% |
| Diversify Advisory Services, LLC | 15.5K | 0.4% |
| DIVERSIFY WEALTH MANAGEMENT, LLC | 15.5K | 0.4% |
| Green Alpha Advisors, LLC | 13.8K | 0.3% |
| Oak Harvest Investment Services | 13.5K | 0.3% |
| Summit Global Investments | 13.1K | 0.3% |
| Parallel Advisors, LLC | 12.9K | 0.3% |
| Lido Advisors, LLC | 10.0K | 0.3% |
| CITIGROUP INC | 10.0K | 0.3% |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | 8.9K | 0.2% |
| SIMON QUICK ADVISORS, LLC | 8.6K | 0.2% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| AIGH Capital Management LLC | Sold Out | 545.1K | 0 | -545.1K |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 1.7M | 1.5M | -225.8K |
| MACKENZIE FINANCIAL CORP | Reduced | 793.5K | 568.4K | -225.1K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 791.1K | 692.1K | -99.0K |
| Allspring Global Investments Holdings, LLC | Reduced | 292.5K | 245.0K | -47.5K |
| PERKINS CAPITAL MANAGEMENT INC | Increased | 16.1K | 49.3K | +33.2K |
| Y-Intercept (Hong Kong) Ltd | Sold Out | 31.9K | 0 | -31.9K |
| Counterpoint Mutual Funds LLC | Sold Out | 16.5K | 0 | -16.5K |
| DekaBank Deutsche Girozentrale | New | 0 | 15.8K | +15.8K |
| Inspire Investing, LLC | Reduced | 29.0K | 18.0K | -11.1K |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | New | 0 | 8.9K | +8.9K |
| Achmea Investment Management B.V. | New | 0 | 8.1K | +8.1K |
| ARIZONA STATE RETIREMENT SYSTEM | New | 0 | 7.7K | +7.7K |
| COMMONWEALTH EQUITY SERVICES, LLC | New | 0 | 6.7K | +6.7K |
| CITIGROUP INC | Reduced | 16.1K | 10.0K | -6.1K |
| Pictet Asset Management Holding SA | New | 0 | 5.9K | +5.9K |
| HARBOR CAPITAL ADVISORS, INC. | Reduced | 31.7K | 26.1K | -5.7K |
| State of Wyoming | Sold Out | 4.9K | 0 | -4.9K |
| Green Alpha Advisors, LLC | Increased | 9.9K | 13.8K | +3.9K |
| Creative Planning | Increased | 13.7K | 17.5K | +3.8K |
| ASSETMARK, INC | Increased | 6.7K | 8.3K | +1.6K |
| State of Alaska, Department of Revenue | Sold Out | 1.6K | 0 | -1.6K |
| NFSG Corp | New | 0 | 1.0K | +1.0K |
| China Universal Asset Management Co., Ltd. | Increased | 4.8K | 5.6K | +747 |
| KORNITZER CAPITAL MANAGEMENT INC /KS | Increased | 264.2K | 264.8K | +571 |
| SJS Investment Consulting Inc. | Increased | 15 | 459 | +444 |
| Diversify Advisory Services, LLC | Reduced | 15.9K | 15.5K | -398 |
| DIVERSIFY WEALTH MANAGEMENT, LLC | Reduced | 15.9K | 15.5K | -398 |
| Caitong International Asset Management Co., Ltd | Increased | 6 | 342 | +336 |
| TRUIST FINANCIAL CORP | Reduced | 23.8K | 23.5K | -320 |
| Ascentis Wealth Management, LLC | New | 0 | 308 | +308 |
| FIRST HORIZON CORP | Reduced | 662 | 446 | -216 |
| First Bank & Trust | Reduced | 18.6K | 18.4K | -215 |
| GK Wealth Management LLC | New | 0 | 214 | +214 |
| Mirae Asset Global Investments Co., Ltd. | Increased | 1.4K | 1.6K | +205 |
| STRS OHIO | Increased | 30.5K | 30.7K | +200 |
| Farther Finance Advisors, LLC | Reduced | 1.8K | 1.6K | -174 |
| Covestor Ltd | Reduced | 473 | 324 | -149 |
| SBI Securities Co., Ltd. | Increased | 47 | 147 | +100 |
| IFP Advisors, Inc | Increased | 60 | 143 | +83 |
| Provenance Wealth Advisors, LLC | New | 0 | 82 | +82 |
| Fortitude Family Office, LLC | Increased | 1 | 76 | +75 |
| GF FUND MANAGEMENT CO. LTD. | Increased | 631 | 687 | +56 |
| Root Financial Partners, LLC | New | 0 | 52 | +52 |
| Spire Wealth Management | Sold Out | 50 | 0 | -50 |
| EverSource Wealth Advisors, LLC | Increased | 139 | 171 | +32 |
| Versant Capital Management, Inc | Increased | 126 | 154 | +28 |
| Sterling Capital Management LLC | Reduced | 603 | 583 | -20 |
| WASATCH ADVISORS LP | Reduced | 279.3K | 279.3K | -6 |
| GAMMA Investing LLC | Increased | 19 | 22 | +3 |
| Lido Advisors, LLC | Increased | 10.0K | 10.0K | +3 |
| Essential Partners LLC | Increased | 190 | 191 | +1 |
| Hughes Financial Services, LLC | Reduced | 436 | 435 | -1 |
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.