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 |
|---|---|---|---|---|---|
| Larson Financial Group LLC | 1 | $25 | 0.00% | 00.0% | Unchanged |
| Twin Peaks Wealth Advisors, LLC | 1 | $25 | 0.00% | +1 | New |
| True Wealth Design, LLC | 2 | $50 | 0.00% | −3−60.0% | Reduced |
| Sunbelt Securities, Inc. | 3 | $74 | 0.00% | +2+200.0% | Added |
| Wealth Preservation Advisors, LLC | 4 | $98 | 0.00% | +4 | New |
| SRS Capital Advisors, Inc. | 4 | $99 | 0.00% | −33−89.2% | Reduced |
| Smartleaf Asset Management LLC | 8 | $207 | 0.00% | +8 | New |
| Investors Portfolio Services LLC | 18 | $325 | 0.00% | +18 | New |
| Signature Equity Partners, LLC | 16 | $393 | 0.00% | 00.0% | Unchanged |
| Missouri Trust & Investment Co | 19 | $466 | 0.00% | 00.0% | Unchanged |
| MAI Capital Management | 19 | $467 | 0.00% | +19 | New |
| SJS Investment Consulting Inc. | 19 | $467 | 0.00% | +19 | New |
| EverSource Wealth Advisors, LLC | 20 | $491 | 0.00% | −8−28.6% | Reduced |
| Parkside Financial Bank & Trust | 25 | $614 | 0.00% | 00.0% | Unchanged |
| Signaturefd, LLC | 45 | $1.10K | 0.00% | 00.0% | Unchanged |
| GAMMA Investing LLC | 46 | $1.13K | 0.00% | −6−11.5% | Reduced |
| SBI Securities Co., Ltd. | 47 | $1.15K | 0.00% | −5−9.6% | Reduced |
| Spire Wealth Management | 50 | $1.23K | 0.00% | 00.0% | Unchanged |
| IFP Advisors, Inc | 52 | $1.28K | 0.00% | 00.0% | Unchanged |
| Rothschild Investment LLC | 58 | $1.42K | 0.00% | +5+9.4% | Added |
| Allworth Financial LP | 63 | $1.55K | 0.00% | +33+110.0% | Added |
| RWM Asset Management, LLC | 88 | $2.16K | 0.00% | +88 | New |
| BFSG, LLC | 90 | $2.21K | 0.00% | 00.0% | Unchanged |
| US Bancorp | 92 | $2.26K | 0.00% | +44+91.7% | Added |
| Essential Partners LLC | 129 | $3.17K | 0.00% | −5−3.7% | Reduced |
| Huntington National Bank | 139 | $3.41K | 0.00% | 00.0% | Unchanged |
| Royal Bank of Canada | 177 | $4.00K | 0.00% | −688−79.5% | Reduced |
| The PNC Financial Services Group, Inc. | 163 | $4.00K | 0.00% | −383−70.1% | Reduced |
| Massmutual Trust Co FSB | 202 | $4.96K | 0.00% | +202 | New |
| Jones Financial Companies LLLP | 250 | $5.88K | 0.00% | −265−51.5% | Reduced |
| Versant Capital Management, Inc | 246 | $6.04K | 0.00% | +65+35.9% | Added |
| Nisa Investment Advisors, LLC | 256 | $6.29K | 0.00% | −25−8.9% | Reduced |
| Advisory Services Network, LLC | 287 | $7.05K | 0.00% | +287 | New |
| Group One Trading, L.P. | 292 | $7.17K | 0.00% | +292 | New |
| Quadrant Capital Group LLC | 336 | $8.25K | 0.00% | 00.0% | Unchanged |
| Meeder Asset Management Inc | 387 | $9.50K | 0.00% | +387 | New |
| Rockefeller Capital Management L.P. | 433 | $10.6K | 0.00% | +346+397.7% | Added |
| Rossby Financial, LCC | 429 | $10.7K | 0.00% | 00.0% | Unchanged |
| Hughes Financial Services, LLC | 446 | $10.9K | 0.00% | +10+2.3% | Added |
| First Horizon Corp | 587 | $14.4K | 0.00% | −91−13.4% | Reduced |
| GF Fund Management Co. Ltd. | 648 | $15.9K | 0.00% | +75+13.1% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 761 | $18.7K | 0.00% | −1,078−58.6% | Reduced |
| Advisor Group Holdings, Inc. | 857 | $21.0K | 0.00% | −35,547−97.6% | Reduced |
| Sterling Capital Management LLC | 971 | $23.8K | 0.00% | −666−40.7% | Reduced |
| Covestor Ltd | 1,096 | $27.0K | 0.02% | +98+9.8% | Added |
| Federated Hermes, Inc. | 1,249 | $30.7K | 0.00% | +589+89.2% | Added |
| State of Alaska, Department of Revenue | 1,553 | $38.0K | 0.00% | 00.0% | Unchanged |
| Mirae Asset Global Investments Co., Ltd. | 1,551 | $38.1K | 0.00% | +133+9.4% | Added |
| Tower Research Capital LLC (TRC) | 1,604 | $39.4K | 0.00% | −409−20.3% | Reduced |
| Ameritas Investment Partners, Inc. | 2,373 | $58.3K | 0.00% | 00.0% | Unchanged |
| Farther Finance Advisors, LLC | 2,388 | $59.8K | 0.00% | −949−28.4% | Reduced |
| CWM, LLC | 3,010 | $73.9K | 0.00% | +708+30.8% | Added |
| Harbour Investments, Inc. | 3,248 | $79.7K | 0.00% | +111+3.5% | Added |
| Great West Life Assurance Co | 3,244 | $80.0K | 0.00% | 00.0% | Unchanged |
| Globeflex Capital L P | 3,759 | $92.3K | 0.01% | 00.0% | Unchanged |
| Citigroup Inc | 4,027 | $98.9K | 0.00% | −28,395−87.6% | Reduced |
| China Universal Asset Management Co., Ltd. | 5,276 | $129.5K | 0.01% | +520+10.9% | Added |
| Assetmark, Inc | 5,779 | $141.9K | 0.00% | +492+9.3% | Added |
| KLP Kapitalforvaltning AS | 6,200 | $152.2K | 0.00% | 00.0% | Unchanged |
| Vanguard Investments Australia, Ltd. | 7,553 | $185.4K | 0.00% | +7,553 | New |
| Police & Firemen's Retirement System of New Jersey | 7,829 | $192.2K | 0.00% | 00.0% | Unchanged |
| Glenmede Trust Co NA | 8,168 | $200.5K | 0.00% | −22−0.3% | Reduced |
| Numerai GP LLC | 8,307 | $203.9K | 0.02% | +8,307 | New |
| Simon Quick Advisors, LLC | 8,561 | $210.2K | 0.01% | 00.0% | Unchanged |
| Cetera Investment Advisers | 9,208 | $226.1K | 0.00% | +273+3.1% | Added |
| Russell Investments Group, Ltd. | 9,315 | $228.7K | 0.00% | +6,827+274.4% | Added |
| Susquehanna International Group, LLP | 9,520 | $233.7K | 0.00% | +9,520 | New |
| State of Wyoming | 9,522 | $233.8K | 0.03% | +6,508+215.9% | Added |
| LPL Financial LLC | 9,700 | $238.1K | 0.00% | −1,177−10.8% | Reduced |
| Green Alpha Advisors, LLC | 9,945 | $244.2K | 0.24% | −291−2.8% | Reduced |
| Lido Advisors, LLC | 10,031 | $246.3K | 0.00% | −50.0% | Reduced |
| TritonPoint Partners, LLC | 10,777 | $264.6K | 0.10% | 00.0% | Unchanged |
| Graham Capital Management, L.P. | 11,133 | $273.3K | 0.01% | +205+1.9% | Added |
| Jackson Creek Investment Advisors LLC | 11,214 | $275.0K | 0.08% | −21−0.2% | Reduced |
| Canada Pension Plan Investment Board | 11,400 | $279.9K | 0.00% | +5,100+81.0% | Added |
| Vanguard Global Advisers, LLC | 11,502 | $282.4K | 0.00% | +11,502 | New |
| Gsa Capital Partners LLP | 12,236 | $300.0K | 0.02% | +12,236 | New |
| Jump Financial, LLC | 12,300 | $302.0K | 0.00% | +6,800+123.6% | Added |
| Manufacturers Life Insurance Company, The | 12,438 | $305.4K | 0.00% | +3,951+46.6% | Added |
| Creative Planning | 12,479 | $306.4K | 0.00% | −3,662−22.7% | Reduced |
| Los Angeles Capital Management LLC | 12,728 | $312.5K | 0.00% | −10,903−46.1% | Reduced |
| Wells Fargo & Company | 12,892 | $316.5K | 0.00% | −21,320−62.3% | Reduced |
| Birchview Capital, LP | 12,900 | $316.7K | 0.18% | −67,700−84.0% | Reduced |
| Parallel Advisors, LLC | 13,301 | $326.5K | 0.01% | −685−4.9% | Reduced |
| Oak Harvest Investment Services | 13,485 | $331.1K | 0.03% | 00.0% | Unchanged |
| Mirae Asset Global ETFs Holdings Ltd. | 13,676 | $335.7K | 0.00% | +453+3.4% | Added |
| Summit Global Investments | 13,718 | $337.0K | 0.02% | +1,353+10.9% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 15,028 | $368.9K | 0.00% | +3,218+27.2% | Added |
| Janus Henderson Group PLC | 15,037 | $369.1K | 0.00% | 00.0% | Unchanged |
| Perkins Capital Management Inc | 15,415 | $378.4K | 0.35% | −12,630−45.0% | Reduced |
| Diversify Wealth Management, LLC | 15,760 | $382.0K | 0.01% | +4,172+36.0% | Added |
| HRT Financial LP | 15,858 | $389.0K | 0.00% | −31,796−66.7% | Reduced |
| Dynamic Technology Lab Private Ltd | 15,913 | $390.7K | 0.06% | +15,913 | New |
| First Bank & Trust | 16,504 | $405.2K | 0.07% | −202−1.2% | Reduced |
| MetLife Investment Management | 16,722 | $410.5K | 0.00% | +841+5.3% | Added |
| Vanguard Asset Management, Ltd | 17,653 | $433.4K | 0.00% | +17,653 | New |
| Engineers Gate Manager LP | 18,256 | $448.2K | 0.01% | −4,693−20.4% | Reduced |
| Brevan Howard Capital Management LP | 18,560 | $455.6K | 0.00% | +18,560 | New |
| XTX Topco Ltd | 20,283 | $497.9K | 0.01% | −1,842−8.3% | Reduced |
| CWM Advisors, LLC | 21,045 | $516.7K | 0.03% | +9,034+75.2% | Added |