No material insider selling pressure detected — open-market sales are small (<0.1% of $806M market cap) and likely routine. Monitor for continued open-market selling in future filings; current activity aligns with normal equity compensation management.
Price Chart
Executive Summary
Castle Biosciences insiders executed a cluster of transactions over the past week, primarily involving derivative exercises, share grants, and tax-related share withholdings. The only open-market sales were $135K by a director and $144.8K by the CFO, both relatively small in context. Most activity represents non-cash, routine equity events tied to compensation.
Key Financial Metrics
Key Facts
- Director Cole G Bradley sold 4,748 shares for $135,033 in an open-market transaction.
- CFO Frank Stokes sold 5,300 shares for $144,796 in an open-market transaction.
- CEO, COO, CCO, and CFO exercised stock options and received new share grants (non-cash events).
- CEO Maetzkold surrendered 19,043 shares ($525K value) to cover tax obligations on a grant.
- All other transactions (grants, exercises, tax withholdings) are non-cash and routine for executive compensation.
Financial Impact
$279.8K in total open-market selling; $692K in tax-related share surrenders; $0 in net cash impact from grants/exercises.
Risk Factors
- Perception of insider selling if context is misunderstood (e.g., conflating tax withholding with profit-taking).
- Potential for increased share dilution over time from repeated share grants.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CONTEXT: Insider Cluster Data (20 trades, 7d window) | cluster-CSTL-1773087200506 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 21, 2026 6d ago | Insider Cluster | $33.19 $33.08 | ▼ −0.33% | ▲ +0.19% | $34.51 (+3.98%) |
Oct 5, 2026 22d ago | 144 | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $34.51 (+3.45%) |
Oct 5, 2026 22d ago | Insider Cluster | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $34.51 (+3.45%) |
Sep 23, 2026 5w ago | Insider Cluster | $35.19 $35.81 | ▼ −1.76% | ▼ −1.22% | $34.51 (+1.93%) |
Sep 16, 2026 6w ago | Insider Cluster | $36.78 $35.34 | ▼ −3.92% | ▼ −4.04% | $34.51 (−6.17%) |
Sep 11, 2026 6w ago | 144 | $33.44 $35.50 | ▲ +6.16% | ▲ +6.62% | $34.51 (+3.20%) |
Sep 3, 2026 7w ago | Insider Cluster | $32.91 $32.76 | ▲ +0.46% | ▼ −0.09% | $34.51 (−4.86%) |
Sep 2, 2026 7w ago | Insider Cluster | $32.65 $32.91 | ▲ +0.80% | ▲ +1.18% | $34.51 (+5.70%) |
Sep 1, 2026 8w ago | Insider Cluster | $33.42 $32.65 | ▼ −2.30% | ▼ −3.35% | $34.51 (+3.26%) |
Aug 27, 2026 8w ago | Insider Cluster | $33.50 $33.03 | ▼ −1.40% | ▼ −1.10% | $34.51 (+3.01%) |
US Market Status
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