CSTL CASTLE BIOSCIENCES INC
FollowCOMMON STOCK (common), issuer CIK 1447362
Filings received so far for Q3 2026: 5 13F filers report a position in CSTL shares at 2026-09-30. The quarter is not complete: its 13F deadline is 2026-11-14, and the counts grow as filings arrive.
13D and 13G filers
No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.
Insider trades
| Owner | Date | Shares | Price | Filing |
|---|---|---|---|---|
| MAETZOLD DEREK Jdirector, officer (Pres. & Chief Exec. Officer) | 2026-10-05 | -2,718 S | $35.566 | Form 4 |
| MAETZOLD DEREK Jdirector, officer (Pres. & Chief Exec. Officer) | 2026-10-05 | -3,198 S | $35.566 | Form 4 |
| MAETZOLD DEREK Jdirector, officer (Pres. & Chief Exec. Officer) | 2026-10-05 | -8,580 S | $35.566 | Form 4 |
| MAETZOLD DEREK Jdirector, officer (Pres. & Chief Exec. Officer) | 2026-10-05 | +8,165 M | $2.39 | Form 4 |
13F holders, Q3 2026
Filers in the available 13F reports with a share position at 2026-09-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.
| Holder | Shares | Value | % of portfolio | Change | Source |
|---|---|---|---|---|---|
| Green Alpha Advisors, LLC | 13,828 | $491K | 0.33% | +3,887 | 13F-HRTimeline |
| Farther Finance Advisors, LLC | 1,632 | $58K | <0.01% | -174 | 13F-HRTimeline |
| GK Wealth Management LLC | 214 | $7.6K | <0.01% | new | 13F-HRTimeline |
| Versant Capital Management, Inc | 154 | $5.47K | <0.01% | +28 | 13F-HRTimeline |
| GAMMA Investing LLC | 22 | $782 | <0.01% | +3 | 13F-HRTimeline |
Events
MAETZOLD DEREK J disposed of 6,331 CSTL shares on 2026-10-05, Form 4 filed 2026-10-07. 0001628280-26-065327
Accepted , ingested