The insider activity is routine and does not signal a change in business outlook. Monitor upcoming earnings or pipeline catalysts for any fundamental shifts; the cluster itself is not actionable.
Price Chart
Executive Summary
Three C-suite insiders at Castle Biosciences (CEO, CCO, COO) sold shares totaling $878K over a week. The CEO's transactions included option exercises and open-market sales, while the CCO and COO sold directly. At $878K against a $1.0B market cap (0.09%), the cluster is trivial and routine — likely driven by tax withholding and diversification, not a bearish signal.
Key Financial Metrics
Key Facts
- Total insider sales: $878K (0.09% of $1.0B market cap)
- Three C-suite executives sold: CEO Derek Maetzold, CCO Tobin Juvenal, COO Kristen Oelschlager
- CEO exercised 12,428 options at $0 and $2.39, then sold shares on the same day
- No open-market purchases in the cluster; all transactions are sells
Financial Impact
Negligible — $878K is 0.09% of market cap, well below the 0.1% materiality threshold
Risk Factors
- No material risk from this cluster; the dollar value is too small to indicate informed selling
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-CSTL-1788332599386 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 21, 2026 5d ago | Insider Cluster | $33.19 $33.08 | ▼ −0.33% | ▲ +0.19% | $33.30 (+0.33%) |
Oct 5, 2026 21d ago | 144 | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $33.30 (−0.18%) |
Oct 5, 2026 21d ago | Insider Cluster | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $33.30 (−0.18%) |
Sep 23, 2026 4w ago | Insider Cluster | $35.19 $35.81 | ▼ −1.76% | ▼ −1.22% | $33.30 (+5.37%) |
Sep 16, 2026 5w ago | Insider Cluster | $36.78 $35.34 | ▼ −3.92% | ▼ −4.04% | $33.30 (−9.46%) |
Sep 11, 2026 6w ago | 144 | $33.44 $35.50 | ▲ +6.16% | ▲ +6.62% | $33.30 (−0.42%) |
Sep 3, 2026 7w ago | Insider Cluster | $32.91 $32.76 | ▲ +0.46% | ▼ −0.09% | $33.30 (−1.19%) |
Sep 2, 2026 7w ago | Insider Cluster | $32.65 $32.91 | ▲ +0.80% | ▲ +1.18% | $33.30 (+1.99%) |
Sep 1, 2026 7w ago | Insider Cluster | $33.42 $32.65 | ▼ −2.30% | ▼ −3.35% | $33.30 (−0.36%) |
Aug 27, 2026 8w ago | Insider Cluster | $33.50 $33.03 | ▼ −1.40% | ▼ −1.10% | $33.30 (−0.60%) |
US Market Status
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