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, Q3 2025
Institutional positions in Castle Biosciences Inc as of Sep 30, 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
- 173
- +22 vs. Q2 2025
- Shares held
- 26.6M
- +114.3K (+0.4%) vs. Q2 2025
- Total value
- $608.3M
- +$66.6M (+12.3%) vs. Q2 2025
- New holders
- 37
- 62 more added
- Sold out
- 15
- 53 more reduced
1 institution that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Castle Biosciences Inc; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Intech Investment Management LLC | 12,392 | $282.2K | 0.00% | +103+0.8% | Added |
| Summit Global Investments | 12,352 | $281.0K | 0.02% | −3,297−21.1% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 12,207 | $278.0K | 0.00% | +118+1.0% | Added |
| Bailard, Inc. | 11,400 | $259.6K | 0.01% | +11,400 | New |
| Stephens Inc | 11,122 | $253.2K | 0.00% | −264−2.3% | Reduced |
| Great West Life Assurance Co | 10,713 | $239.0K | 0.00% | 00.0% | Unchanged |
| Magnetar Financial LLC | 10,327 | $235.1K | 0.00% | +10,327 | New |
| Glenmede Investment Management, LP | 10,199 | $232.2K | 0.00% | +10,199 | New |
| Lido Advisors, LLC | 10,036 | $228.5K | 0.00% | +50.0% | Added |
| Two Sigma Advisers, LP | 9,900 | $225.4K | 0.00% | −2,100−17.5% | Reduced |
| Atom Investors LP | 9,827 | $223.8K | 0.02% | +9,827 | New |
| STRS Ohio | 9,800 | $223.1K | 0.00% | −1,900−16.2% | Reduced |
| Manufacturers Life Insurance Company, The | 9,539 | $217.2K | 0.00% | −777−7.5% | Reduced |
| Green Alpha Advisors, LLC | 9,538 | $217.2K | 0.21% | +9,538 | New |
| LPL Financial LLC | 9,397 | $214.0K | 0.00% | +9,397 | New |
| Janus Henderson Group PLC | 9,137 | $208.2K | 0.00% | +9,137 | New |
| KLP Kapitalforvaltning AS | 8,900 | $202.7K | 0.00% | +4,100+85.4% | Added |
| Police & Firemen's Retirement System of New Jersey | 7,829 | $178.3K | 0.00% | +1,992+34.1% | Added |
| Assetmark, Inc | 5,705 | $129.9K | 0.00% | +1,158+25.5% | Added |
| China Universal Asset Management Co., Ltd. | 5,085 | $115.8K | 0.01% | −714−12.3% | Reduced |
| Citigroup Inc | 4,250 | $96.8K | 0.00% | −9,822−69.8% | Reduced |
| Tower Research Capital LLC (TRC) | 3,666 | $83.5K | 0.00% | +875+31.4% | Added |
| Harbour Investments, Inc. | 3,137 | $71.4K | 0.00% | +150+5.0% | Added |
| Russell Investments Group, Ltd. | 2,508 | $57.1K | 0.00% | +976+63.7% | Added |
| Canada Pension Plan Investment Board | 2,400 | $54.6K | 0.00% | +2,400 | New |
| Point72 (DIFC) Ltd | 2,386 | $54.3K | 0.00% | +2,386 | New |
| Ameritas Investment Partners, Inc. | 2,373 | $54.0K | 0.00% | −527−18.2% | Reduced |
| Aquatic Capital Management LLC | 2,335 | $53.2K | 0.00% | −16,945−87.9% | Reduced |
| Covestor Ltd | 2,069 | $47.0K | 0.03% | −311−13.1% | Reduced |
| Sterling Capital Management LLC | 1,960 | $44.6K | 0.00% | +1,193+155.5% | Added |
| CWM, LLC | 1,911 | $44.0K | 0.00% | +853+80.6% | Added |
| State of Alaska, Department of Revenue | 1,553 | $35.0K | 0.00% | +1,553 | New |
| Simplex Trading, LLC | 1,512 | $34.0K | 0.00% | +1,512 | New |
| Farther Finance Advisors, LLC | 1,392 | $31.7K | 0.00% | +1,391+139,100.0% | Added |
| Mirae Asset Global Investments Co., Ltd. | 1,121 | $25.5K | 0.00% | +6+0.5% | Added |
| Global Retirement Partners, LLC | 1,100 | $25.0K | 0.00% | −63−5.4% | Reduced |
| Royal Bank of Canada | 897 | $20.0K | 0.00% | −9,676−91.5% | Reduced |
| Amalgamated Bank | 893 | $20.0K | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 803 | $18.3K | 0.00% | +803 | New |
| Caitong International Asset Management Co., Ltd | 728 | $16.6K | 0.01% | +622+586.8% | Added |
| Hughes Financial Services, LLC | 435 | $15.1K | 0.00% | 00.0% | Unchanged |
| GF Fund Management Co. Ltd. | 624 | $14.2K | 0.00% | −92−12.8% | Reduced |
| SRS Capital Advisors, Inc. | 574 | $13.1K | 0.00% | +574 | New |
| First Horizon Corp | 447 | $10.2K | 0.00% | +447 | New |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 461 | $10.0K | 0.00% | +33+7.7% | Added |
| Advisor Group Holdings, Inc. | 408 | $9.26K | 0.00% | +209+105.0% | Added |
| Rossby Financial, LCC | 382 | $8.79K | 0.00% | +240+169.0% | Added |
| Nisa Investment Advisors, LLC | 364 | $8.29K | 0.00% | +44+13.8% | Added |
| Quadrant Capital Group LLC | 336 | $7.65K | 0.00% | +336 | New |
| Versant Capital Management, Inc | 181 | $4.12K | 0.00% | +55+43.7% | Added |
| Huntington National Bank | 139 | $3.17K | 0.00% | −58−29.4% | Reduced |
| Essential Partners LLC | 123 | $2.80K | 0.00% | +123 | New |
| The PNC Financial Services Group, Inc. | 115 | $2.62K | 0.00% | +5+4.5% | Added |
| Point72 Europe (London) LLP | 112 | $2.56K | 0.00% | +112 | New |
| BFSG, LLC | 90 | $2.05K | 0.00% | 00.0% | Unchanged |
| Daiwa Securities Group Inc. | 86 | $2.00K | 0.00% | 00.0% | Unchanged |
| Principal Securities, Inc. | 76 | $1.73K | 0.00% | 00.0% | Unchanged |
| Rothschild Investment LLC | 55 | $1.25K | 0.00% | −30−35.3% | Reduced |
| SBI Securities Co., Ltd. | 53 | $1.21K | 0.00% | +3+6.0% | Added |
| GAMMA Investing LLC | 52 | $1.18K | 0.00% | −80−60.6% | Reduced |
| IFP Advisors, Inc | 52 | $1.18K | 0.00% | +16+44.4% | Added |
| Spire Wealth Management | 50 | $1.14K | 0.00% | 00.0% | Unchanged |
| Signaturefd, LLC | 45 | $1.02K | 0.00% | 00.0% | Unchanged |
| Optiver Holding B.V. | 40 | $911 | 0.00% | +40 | New |
| US Bancorp | 26 | $592 | 0.00% | +26 | New |
| Jones Financial Companies LLLP | 25 | $568 | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 20 | $455 | 0.00% | −27−57.4% | Reduced |
| Missouri Trust & Investment Co | 19 | $433 | 0.00% | 00.0% | Unchanged |
| Allworth Financial LP | 19 | $433 | 0.00% | +14+280.0% | Added |
| Clearstead Advisors, LLC | 12 | $274 | 0.00% | +12 | New |
| Advisory Services Network, LLC | 7 | $159 | 0.00% | +7 | New |
| Larson Financial Group LLC | 1 | $23 | 0.00% | +1 | New |
| True Wealth Design, LLC | 1 | $23 | 0.00% | +1 | New |
| Wellington Management Group LLP | 0 | $0 | 0.00% | −407,211−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −125,719−100.0% | Sold out |
| Y-Intercept (Hong Kong) Ltd | 0 | $0 | 0.00% | −78,938−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −46,301−100.0% | Sold out |
| Nebula Research & Development LLC | 0 | $0 | 0.00% | −44,472−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −21,858−100.0% | Sold out |
| Advantage Alpha Capital Partners LP | 0 | $0 | 0.00% | −16,021−100.0% | Sold out |
| Mount Yale Investment Advisors, LLC | 0 | $0 | 0.00% | −8,362−100.0% | Sold out |
| Raymond James Financial Inc | 0 | $0 | 0.00% | −662−100.0% | Sold out |
| Lazard Asset Management LLC | 0 | $0 | 0.00% | −72−100.0% | Sold out |
| Bryn Mawr Trust Co | 0 | $0 | 0.00% | −46−100.0% | Sold out |
| Parkside Financial Bank & Trust | 0 | $0 | 0.00% | −25−100.0% | Sold out |
| Skopos Labs, Inc. | 0 | $0 | 0.00% | −11−100.0% | Sold out |
| Stephens Consulting, LLC | 0 | $0 | 0.00% | −2−100.0% | Sold out |
| Twin Peaks Wealth Advisors, LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| First Horizon Advisors, Inc. | – | – | – | – | Not filed |