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 21 sales; 176 institutions reported holding it in 13F filings for Q2 2026, worth $653.8M in total; no superinvestor holds it.
Q4 2025 vs. Q3 2025
How the institutions holding Castle Biosciences Inc changed between Q3 2025 and Q4 2025.
All holders in Q4 2025All holders in Q3 2025
| Measure | Q3 2025 | Of which not filed for Q4 2025 | Q4 2025 | Change |
|---|---|---|---|---|
| Holders | 173 | 4 | 195 | +26 |
| Shares | 26.6M | 63.0K | 27.3M | +724.4K (+2.7%) |
| Value | $608.3M | $1.43M | $1.06B | +$455.1M (+75.0%) |
4 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.
New holders (43)
Institutions that held Castle Biosciences Inc at the end of Q4 2025 but not at the end of Q3 2025.
Sold out (17)
Institutions that held Castle Biosciences Inc at the end of Q3 2025 and filed for Q4 2025 without it.
| Institution | Shares, Q3 2025 | Value, Q3 2025 |
|---|---|---|
| Summit Wealth Group LLC | 122,494 | $4.51M |
| Tritonpoint Wealth, LLC | 40,777 | $928.5K |
| Healthcare of Ontario Pension Plan Trust Fund | 35,800 | $815.2K |
| Dynamic Technology Lab Private Ltd | 29,310 | $667.0K |
| Campbell & CO Investment Adviser LLC | 26,996 | $614.7K |
| Susquehanna International Group, LLP | 24,225 | $551.6K |
| Brevan Howard Capital Management LP | 19,128 | $435.5K |
| Capstone Investment Advisors, LLC | 16,677 | $379.7K |
| Bailard, Inc. | 11,400 | $259.6K |
| Magnetar Financial LLC | 10,327 | $235.1K |
| Atom Investors LP | 9,827 | $223.8K |
| Simplex Trading, LLC | 1,512 | $34.0K |
| Group One Trading, L.P. | 803 | $18.3K |
| Principal Securities, Inc. | 76 | $1.73K |
| Optiver Holding B.V. | 40 | $911 |
| Clearstead Advisors, LLC | 12 | $274 |
| Advisory Services Network, LLC | 7 | $159 |
Not filed for Q4 2025 yet (4)
Institutions that held Castle Biosciences Inc at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.
| Institution | Shares, Q3 2025 | Value, Q3 2025 |
|---|---|---|
| Cubist Systematic Strategies, LLC | 50,304 | $1.15M |
| Glenmede Investment Management, LP | 10,199 | $232.2K |
| Point72 (DIFC) Ltd | 2,386 | $54.3K |
| Point72 Europe (London) LLP | 112 | $2.56K |