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, Q1 2026
Institutional positions in Castle Biosciences Inc as of Mar 31, 2026. 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
- 186
- −7 vs. Q4 2025
- Shares held
- 27.6M
- +2.50M (+10.0%) vs. Q4 2025
- Total value
- $677.8M
- −$298.6M (−30.6%) vs. Q4 2025
- New holders
- 29
- 72 more added
- Sold out
- 36
- 61 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Castle Biosciences Inc; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Mirae Asset Global ETFs Holdings Ltd. | 13,676 | $335.7K | 0.00% | +453+3.4% | Added |
| Oak Harvest Investment Services | 13,485 | $331.1K | 0.03% | 00.0% | Unchanged |
| Parallel Advisors, LLC | 13,301 | $326.5K | 0.01% | −685−4.9% | Reduced |
| Birchview Capital, LP | 12,900 | $316.7K | 0.18% | −67,700−84.0% | Reduced |
| Wells Fargo & Company | 12,892 | $316.5K | 0.00% | −21,320−62.3% | Reduced |
| Los Angeles Capital Management LLC | 12,728 | $312.5K | 0.00% | −10,903−46.1% | Reduced |
| Creative Planning | 12,479 | $306.4K | 0.00% | −3,662−22.7% | Reduced |
| Manufacturers Life Insurance Company, The | 12,438 | $305.4K | 0.00% | +3,951+46.6% | Added |
| Jump Financial, LLC | 12,300 | $302.0K | 0.00% | +6,800+123.6% | Added |
| Gsa Capital Partners LLP | 12,236 | $300.0K | 0.02% | +12,236 | New |
| Vanguard Global Advisers, LLC | 11,502 | $282.4K | 0.00% | +11,502 | New |
| Canada Pension Plan Investment Board | 11,400 | $279.9K | 0.00% | +5,100+81.0% | Added |
| Jackson Creek Investment Advisors LLC | 11,214 | $275.0K | 0.08% | −21−0.2% | Reduced |
| Graham Capital Management, L.P. | 11,133 | $273.3K | 0.01% | +205+1.9% | Added |
| TritonPoint Partners, LLC | 10,777 | $264.6K | 0.10% | 00.0% | Unchanged |
| Lido Advisors, LLC | 10,031 | $246.3K | 0.00% | −50.0% | Reduced |
| Green Alpha Advisors, LLC | 9,945 | $244.2K | 0.24% | −291−2.8% | Reduced |
| LPL Financial LLC | 9,700 | $238.1K | 0.00% | −1,177−10.8% | Reduced |
| State of Wyoming | 9,522 | $233.8K | 0.03% | +6,508+215.9% | Added |
| Susquehanna International Group, LLP | 9,520 | $233.7K | 0.00% | +9,520 | New |
| Russell Investments Group, Ltd. | 9,315 | $228.7K | 0.00% | +6,827+274.4% | Added |
| Cetera Investment Advisers | 9,208 | $226.1K | 0.00% | +273+3.1% | Added |
| Simon Quick Advisors, LLC | 8,561 | $210.2K | 0.01% | 00.0% | Unchanged |
| Numerai GP LLC | 8,307 | $203.9K | 0.02% | +8,307 | New |
| Glenmede Trust Co NA | 8,168 | $200.5K | 0.00% | −22−0.3% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 7,829 | $192.2K | 0.00% | 00.0% | Unchanged |
| Vanguard Investments Australia, Ltd. | 7,553 | $185.4K | 0.00% | +7,553 | New |
| KLP Kapitalforvaltning AS | 6,200 | $152.2K | 0.00% | 00.0% | Unchanged |
| Assetmark, Inc | 5,779 | $141.9K | 0.00% | +492+9.3% | Added |
| China Universal Asset Management Co., Ltd. | 5,276 | $129.5K | 0.01% | +520+10.9% | Added |
| Citigroup Inc | 4,027 | $98.9K | 0.00% | −28,395−87.6% | Reduced |
| Globeflex Capital L P | 3,759 | $92.3K | 0.01% | 00.0% | Unchanged |
| Great West Life Assurance Co | 3,244 | $80.0K | 0.00% | 00.0% | Unchanged |
| Harbour Investments, Inc. | 3,248 | $79.7K | 0.00% | +111+3.5% | Added |
| CWM, LLC | 3,010 | $73.9K | 0.00% | +708+30.8% | Added |
| Farther Finance Advisors, LLC | 2,388 | $59.8K | 0.00% | −949−28.4% | Reduced |
| Ameritas Investment Partners, Inc. | 2,373 | $58.3K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 1,604 | $39.4K | 0.00% | −409−20.3% | Reduced |
| Mirae Asset Global Investments Co., Ltd. | 1,551 | $38.1K | 0.00% | +133+9.4% | Added |
| State of Alaska, Department of Revenue | 1,553 | $38.0K | 0.00% | 00.0% | Unchanged |
| Federated Hermes, Inc. | 1,249 | $30.7K | 0.00% | +589+89.2% | Added |
| Covestor Ltd | 1,096 | $27.0K | 0.02% | +98+9.8% | Added |
| Sterling Capital Management LLC | 971 | $23.8K | 0.00% | −666−40.7% | Reduced |
| Advisor Group Holdings, Inc. | 857 | $21.0K | 0.00% | −35,547−97.6% | Reduced |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 761 | $18.7K | 0.00% | −1,078−58.6% | Reduced |
| GF Fund Management Co. Ltd. | 648 | $15.9K | 0.00% | +75+13.1% | Added |
| First Horizon Corp | 587 | $14.4K | 0.00% | −91−13.4% | Reduced |
| Hughes Financial Services, LLC | 446 | $10.9K | 0.00% | +10+2.3% | Added |
| Rossby Financial, LCC | 429 | $10.7K | 0.00% | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 433 | $10.6K | 0.00% | +346+397.7% | Added |
| Meeder Asset Management Inc | 387 | $9.50K | 0.00% | +387 | New |
| Quadrant Capital Group LLC | 336 | $8.25K | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 292 | $7.17K | 0.00% | +292 | New |
| Advisory Services Network, LLC | 287 | $7.05K | 0.00% | +287 | New |
| Nisa Investment Advisors, LLC | 256 | $6.29K | 0.00% | −25−8.9% | Reduced |
| Versant Capital Management, Inc | 246 | $6.04K | 0.00% | +65+35.9% | Added |
| Jones Financial Companies LLLP | 250 | $5.88K | 0.00% | −265−51.5% | Reduced |
| Massmutual Trust Co FSB | 202 | $4.96K | 0.00% | +202 | New |
| The PNC Financial Services Group, Inc. | 163 | $4.00K | 0.00% | −383−70.1% | Reduced |
| Royal Bank of Canada | 177 | $4.00K | 0.00% | −688−79.5% | Reduced |
| Huntington National Bank | 139 | $3.41K | 0.00% | 00.0% | Unchanged |
| Essential Partners LLC | 129 | $3.17K | 0.00% | −5−3.7% | Reduced |
| US Bancorp | 92 | $2.26K | 0.00% | +44+91.7% | Added |
| BFSG, LLC | 90 | $2.21K | 0.00% | 00.0% | Unchanged |
| RWM Asset Management, LLC | 88 | $2.16K | 0.00% | +88 | New |
| Allworth Financial LP | 63 | $1.55K | 0.00% | +33+110.0% | Added |
| Rothschild Investment LLC | 58 | $1.42K | 0.00% | +5+9.4% | Added |
| IFP Advisors, Inc | 52 | $1.28K | 0.00% | 00.0% | Unchanged |
| Spire Wealth Management | 50 | $1.23K | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 47 | $1.15K | 0.00% | −5−9.6% | Reduced |
| GAMMA Investing LLC | 46 | $1.13K | 0.00% | −6−11.5% | Reduced |
| Signaturefd, LLC | 45 | $1.10K | 0.00% | 00.0% | Unchanged |
| Parkside Financial Bank & Trust | 25 | $614 | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 20 | $491 | 0.00% | −8−28.6% | Reduced |
| MAI Capital Management | 19 | $467 | 0.00% | +19 | New |
| SJS Investment Consulting Inc. | 19 | $467 | 0.00% | +19 | New |
| Missouri Trust & Investment Co | 19 | $466 | 0.00% | 00.0% | Unchanged |
| Signature Equity Partners, LLC | 16 | $393 | 0.00% | 00.0% | Unchanged |
| Investors Portfolio Services LLC | 18 | $325 | 0.00% | +18 | New |
| Smartleaf Asset Management LLC | 8 | $207 | 0.00% | +8 | New |
| SRS Capital Advisors, Inc. | 4 | $99 | 0.00% | −33−89.2% | Reduced |
| Wealth Preservation Advisors, LLC | 4 | $98 | 0.00% | +4 | New |
| Sunbelt Securities, Inc. | 3 | $74 | 0.00% | +2+200.0% | Added |
| True Wealth Design, LLC | 2 | $50 | 0.00% | −3−60.0% | Reduced |
| Larson Financial Group LLC | 1 | $25 | 0.00% | 00.0% | Unchanged |
| Twin Peaks Wealth Advisors, LLC | 1 | $25 | 0.00% | +1 | New |
| Wellington Management Group LLP | 0 | $0 | 0.00% | −218,560−100.0% | Sold out |
| Braidwell LP | 0 | $0 | 0.00% | −177,183−100.0% | Sold out |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −119,458−100.0% | Sold out |
| EAM Investors, LLC | 0 | $0 | 0.00% | −74,138−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −55,118−100.0% | Sold out |
| Ameriprise Financial Inc | 0 | $0 | 0.00% | −35,368−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −29,899−100.0% | Sold out |
| Caxton Associates LLP | 0 | $0 | 0.00% | −22,464−100.0% | Sold out |
| HSBC Holdings PLC | 0 | $0 | 0.00% | −19,486−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −17,116−100.0% | Sold out |
| Verition Fund Management LLC | 0 | $0 | 0.00% | −16,811−100.0% | Sold out |
| Counterpoint Mutual Funds LLC | 0 | $0 | 0.00% | −12,952−100.0% | Sold out |
| Intech Investment Management LLC | 0 | $0 | 0.00% | −11,718−100.0% | Sold out |
| Stephens Inc | 0 | $0 | 0.00% | −11,122−100.0% | Sold out |