CSTL: Castle Biosciences Inc insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 11 sales totaling $1.47M in the last 180 days.
Insider sales
| Trade date | Insider | Role | Value | 10b5-1 plan |
|---|---|---|---|---|
| 2026-10-19 | Maetzold Derek J | Officer | $274K | yes |
| 2026-10-19 | Maetzold Derek J | Officer | $102K | yes |
| 2026-10-19 | Maetzold Derek J | Officer | $87K | yes |
| 2026-10-12 | Juvenal Tobin W | Officer | $111K | yes |
| 2026-10-05 | Maetzold Derek J | Officer | $305K | yes |
| 2026-10-05 | Maetzold Derek J | Officer | $114K | yes |
| 2026-10-05 | Maetzold Derek J | Officer | $97K | yes |
| 2026-10-01 | Oelschlager Kristen M | Officer | $100K | yes |
| 2026-10-01 | Oelschlager Kristen M | Officer | $49K | yes |
| 2026-09-30 | Juvenal Tobin W | Officer | $35K | yes |
| 2026-09-29 | Juvenal Tobin W | Officer | $197K | yes |
Institutional ownership (Q2 2026)
177 institutions reported holding $625.85M of Castle Biosciences Inc on Form 13F (187 the quarter before). 20 opened a new position and 30 sold out. Shares held by institutions: -1%.
| Largest holders | Shares | Value |
|---|---|---|
| BlackRock, Inc. | 3,291,963 | $78.51M |
| RTW INVESTMENTS, LP | 2,778,335 | $66.26M |
| PRINCIPAL FINANCIAL GROUP INC | 1,726,648 | $41.18M |
| VANGUARD CAPITAL MANAGEMENT LLC | 1,226,497 | $29.25M |
| Allianz Asset Management GmbH | 879,258 | $20.97M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 840,785 | $20.05M |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | 824,872 | $19.67M |
| STATE STREET CORP | 822,079 | $19.63M |
| GEODE CAPITAL MANAGEMENT, LLC | 795,912 | $18.99M |
| MACKENZIE FINANCIAL CORP | 793,507 | $18.93M |
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