Castle Biosciences Inc
CSTL- Exchange
- Nasdaq
- Industry
- Services-Medical Laboratories
- SEC CIK
- 0001447362
In the last 90 days, Castle Biosciences Inc insiders filed 0 open-market purchases and 20 sales; 176 institutions reported holding it in 13F filings for Q2 2026, worth $653.8M in total; no superinvestor holds it.
13F holders, Q4 2025
Institutional positions in Castle Biosciences Inc as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 195
- +26 vs. Q3 2025
- Shares held
- 27.3M
- +724.4K (+2.7%) vs. Q3 2025
- Total value
- $1.06B
- +$455.1M (+75.0%) vs. Q3 2025
- New holders
- 43
- 64 more added
- Sold out
- 17
- 69 more reduced
4 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting CSTL on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 176 | $653.8M |
| Q1 2026 | 186 | $677.8M |
| Q4 2025 | 195 | $1.06B |
| Q3 2025 | 173 | $608.3M |
| Q2 2025 | 152 | $541.8M |
| Q1 2025 | 180 | $516.3M |
| Q4 2024 | 197 | $706.4M |
| Q3 2024 | 185 | $736.9M |
| Q2 2024 | 159 | $549.4M |
| Q1 2024 | 151 | $553.2M |
| Q4 2023 | 153 | $515.4M |
| Q3 2023 | 135 | $391.0M |
| Q2 2023 | 130 | $316.6M |
| Q1 2023 | 148 | $501.9M |
| Q4 2022 | 153 | $522.0M |
| Q3 2022 | 157 | $569.8M |
| Q2 2022 | 146 | $495.0M |
| Q1 2022 | 160 | $1.02B |
| Q4 2021 | 159 | $918.6M |
| Q3 2021 | 188 | $1.42B |
| Q2 2021 | 182 | $1.52B |
| Q1 2021 | 175 | $1.46B |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Castle Biosciences Inc; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Larson Financial Group LLC | 1 | $39 | 0.00% | 00.0% | Unchanged |
| Sunbelt Securities, Inc. | 1 | $39 | 0.00% | +1 | New |
| True Wealth Design, LLC | 5 | $195 | 0.00% | +4+400.0% | Added |
| Signature Equity Partners, LLC | 16 | $622 | 0.00% | +16 | New |
| Missouri Trust & Investment Co | 19 | $739 | 0.00% | 00.0% | Unchanged |
| Torren Management, LLC | 21 | $817 | 0.00% | +21 | New |
| Parkside Financial Bank & Trust | 25 | $973 | 0.00% | +25 | New |
| EverSource Wealth Advisors, LLC | 28 | $1.09K | 0.00% | +8+40.0% | Added |
| Northwestern Mutual Wealth Management Co | 28 | $1.09K | 0.00% | +28 | New |
| Allworth Financial LP | 30 | $1.17K | 0.00% | +11+57.9% | Added |
| SRS Capital Advisors, Inc. | 37 | $1.44K | 0.00% | −537−93.6% | Reduced |
| Signaturefd, LLC | 45 | $1.75K | 0.00% | 00.0% | Unchanged |
| Quantbot Technologies LP | 47 | $1.83K | 0.00% | +47 | New |
| US Bancorp | 48 | $1.87K | 0.00% | +22+84.6% | Added |
| Spire Wealth Management | 50 | $1.95K | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 52 | $2.02K | 0.00% | −1−1.9% | Reduced |
| IFP Advisors, Inc | 52 | $2.02K | 0.00% | 00.0% | Unchanged |
| GAMMA Investing LLC | 52 | $2.02K | 0.00% | 00.0% | Unchanged |
| Rothschild Investment LLC | 53 | $2.06K | 0.00% | −2−3.6% | Reduced |
| Daiwa Securities Group Inc. | 86 | $3.00K | 0.00% | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 87 | $3.38K | 0.00% | +87 | New |
| BFSG, LLC | 90 | $3.50K | 0.00% | 00.0% | Unchanged |
| Essential Partners LLC | 134 | $5.21K | 0.00% | +11+8.9% | Added |
| Huntington National Bank | 139 | $5.41K | 0.00% | 00.0% | Unchanged |
| Aster Capital Management (DIFC) Ltd | 151 | $5.87K | 0.00% | +151 | New |
| Versant Capital Management, Inc | 181 | $7.04K | 0.00% | 00.0% | Unchanged |
| Nisa Investment Advisors, LLC | 281 | $10.9K | 0.00% | −83−22.8% | Reduced |
| Quadrant Capital Group LLC | 336 | $13.1K | 0.00% | 00.0% | Unchanged |
| Rossby Financial, LCC | 429 | $16.7K | 0.01% | +47+12.3% | Added |
| Hughes Financial Services, LLC | 436 | $17.0K | 0.00% | +1+0.2% | Added |
| Jones Financial Companies LLLP | 515 | $20.0K | 0.00% | +490+1,960.0% | Added |
| The PNC Financial Services Group, Inc. | 546 | $21.2K | 0.00% | +431+374.8% | Added |
| GF Fund Management Co. Ltd. | 573 | $22.3K | 0.00% | −51−8.2% | Reduced |
| Federated Hermes, Inc. | 660 | $25.7K | 0.00% | +660 | New |
| First Horizon Corp | 678 | $26.4K | 0.00% | +231+51.7% | Added |
| Royal Bank of Canada | 865 | $33.0K | 0.00% | −32−3.6% | Reduced |
| Kemnay Advisory Services Inc. | 889 | $34.6K | 0.01% | +889 | New |
| Amalgamated Bank | 892 | $35.0K | 0.00% | −1−0.1% | Reduced |
| Covestor Ltd | 998 | $39.0K | 0.02% | −1,071−51.8% | Reduced |
| Global Retirement Partners, LLC | 1,100 | $42.8K | 0.00% | 00.0% | Unchanged |
| Mirae Asset Global Investments Co., Ltd. | 1,418 | $55.2K | 0.00% | +297+26.5% | Added |
| State of Alaska, Department of Revenue | 1,553 | $60.0K | 0.00% | 00.0% | Unchanged |
| Sterling Capital Management LLC | 1,637 | $63.7K | 0.00% | −323−16.5% | Reduced |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 1,839 | $72.0K | 0.00% | +1,378+298.9% | Added |
| Tower Research Capital LLC (TRC) | 2,013 | $78.3K | 0.00% | −1,653−45.1% | Reduced |
| Caitong International Asset Management Co., Ltd | 2,099 | $81.7K | 0.02% | +1,371+188.3% | Added |
| CWM, LLC | 2,302 | $90.0K | 0.00% | +391+20.5% | Added |
| Ameritas Investment Partners, Inc. | 2,373 | $92.3K | 0.00% | 00.0% | Unchanged |
| Persistent Asset Partners Ltd | 2,463 | $95.8K | 0.05% | +2,463 | New |
| Russell Investments Group, Ltd. | 2,488 | $96.8K | 0.00% | −20−0.8% | Reduced |
| State of Wyoming | 3,014 | $117.2K | 0.01% | +3,014 | New |
| Harbour Investments, Inc. | 3,137 | $122.0K | 0.00% | 00.0% | Unchanged |
| Great West Life Assurance Co | 3,244 | $126.0K | 0.00% | −7,469−69.7% | Reduced |
| Farther Finance Advisors, LLC | 3,337 | $129.8K | 0.00% | +1,945+139.7% | Added |
| Globeflex Capital L P | 3,759 | $146.2K | 0.02% | +3,759 | New |
| China Universal Asset Management Co., Ltd. | 4,756 | $185.0K | 0.01% | −329−6.5% | Reduced |
| Raymond James Financial Inc | 5,238 | $203.8K | 0.00% | +5,238 | New |
| Voya Investment Management LLC | 5,246 | $204.1K | 0.00% | +5,246 | New |
| Assetmark, Inc | 5,287 | $205.7K | 0.00% | −418−7.3% | Reduced |
| Jump Financial, LLC | 5,500 | $213.9K | 0.00% | +5,500 | New |
| Lido Advisors, LLC | 10,036 | $228.5K | 0.00% | 00.0% | Unchanged |
| Pictet Asset Management Holding SA | 5,899 | $229.5K | 0.00% | +5,899 | New |
| Portside Wealth Group, LLC | 5,942 | $231.1K | 0.03% | +5,942 | New |
| Cornerstone Investment Partners, LLC | 6,078 | $236.4K | 0.01% | +6,078 | New |
| KLP Kapitalforvaltning AS | 6,200 | $241.2K | 0.00% | −2,700−30.3% | Reduced |
| Canada Pension Plan Investment Board | 6,300 | $245.1K | 0.00% | +3,900+162.5% | Added |
| Capstone Capital Management Ltd | 6,446 | $250.7K | 0.24% | +6,446 | New |
| Blueshift Asset Management, LLC | 6,458 | $251.2K | 0.07% | +6,458 | New |
| ProShare Advisors LLC | 6,478 | $252.0K | 0.00% | +6,478 | New |
| Commonwealth Equity Services, LLC | 6,591 | $256.4K | 0.00% | +6,591 | New |
| Arrowstreet Capital, Limited Partnership | 7,029 | $273.4K | 0.00% | +7,029 | New |
| Verdad Advisers, LP | 7,085 | $275.6K | 0.32% | +7,085 | New |
| State Board of Administration of Florida Retirement System | 7,154 | $278.3K | 0.00% | +7,154 | New |
| Intrust Bank NA | 7,378 | $287.0K | 0.02% | +7,378 | New |
| Police & Firemen's Retirement System of New Jersey | 7,829 | $304.5K | 0.00% | 00.0% | Unchanged |
| Arizona State Retirement System | 8,071 | $314.0K | 0.00% | +8,071 | New |
| Glenmede Trust Co NA | 8,190 | $318.6K | 0.00% | +8,190 | New |
| Manufacturers Life Insurance Company, The | 8,487 | $330.1K | 0.00% | −1,052−11.0% | Reduced |
| Simon Quick Advisors, LLC | 8,561 | $333.0K | 0.01% | −5,001−36.9% | Reduced |
| Cetera Investment Advisers | 8,935 | $347.6K | 0.00% | +8,935 | New |
| Quantinno Capital Management LP | 9,332 | $363.0K | 0.00% | +9,332 | New |
| Green Alpha Advisors, LLC | 10,236 | $398.2K | 0.36% | +698+7.3% | Added |
| Aquatic Capital Management LLC | 10,570 | $411.2K | 0.01% | +8,235+352.7% | Added |
| TritonPoint Partners, LLC | 10,777 | $419.2K | 0.22% | +10,777 | New |
| LPL Financial LLC | 10,877 | $423.1K | 0.00% | +1,480+15.7% | Added |
| Graham Capital Management, L.P. | 10,928 | $425.1K | 0.01% | −10,205−48.3% | Reduced |
| Stephens Inc | 11,122 | $432.6K | 0.01% | 00.0% | Unchanged |
| Jackson Creek Investment Advisors LLC | 11,235 | $437.0K | 0.13% | +11,235 | New |
| Man Group plc | 11,585 | $450.7K | 0.00% | +11,585 | New |
| Intech Investment Management LLC | 11,718 | $455.8K | 0.00% | −674−5.4% | Reduced |
| Diversify Wealth Management, LLC | 11,588 | $459.3K | 0.02% | −159−1.4% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 11,810 | $459.4K | 0.00% | −397−3.3% | Reduced |
| CWM Advisors, LLC | 12,011 | $467.2K | 0.04% | −7,876−39.6% | Reduced |
| Summit Global Investments | 12,365 | $481.0K | 0.03% | +13+0.1% | Added |
| STRS Ohio | 12,600 | $490.1K | 0.00% | +2,800+28.6% | Added |
| Counterpoint Mutual Funds LLC | 12,952 | $503.8K | 0.04% | +12,952 | New |
| Mirae Asset Global ETFs Holdings Ltd. | 13,223 | $514.4K | 0.00% | −50−0.4% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 13,246 | $515.3K | 0.01% | +13,246 | New |
| Harbor Capital Advisors, Inc. | 13,432 | $523.0K | 0.04% | +261+2.0% | Added |
| Oak Harvest Investment Services | 13,485 | $524.6K | 0.06% | −3,398−20.1% | Reduced |