The COO's concentrated selling near $34 (recent highs) without a clear 10b5-1 plan is a cautionary signal. Monitor for upcoming earnings or pipeline updates that could explain the timing. The cross-filing actuarial verdicts amplify this cluster's significance — consider reducing position size or hedging ahead of any catalyst event.
Price Chart
Executive Summary
Two C-suite insiders at Castle Biosciences sold a combined $463K in open-market sales over a week, with the COO alone selling $838K across three trades. No 10b5-1 pattern is evident, and the cluster is amplified by the cross-filing actuarial verdicts for insider-trades + press-context and insider-trades + offering-context, suggesting elevated informational content.
Key Financial Metrics
Key Facts
- COO Kristen Oelschlager sold $838K in three open-market trades on Aug 24-25 at $33.69-$34.64
- CCO Tobin Juvenal sold $51K on Aug 17 at $29.59
- Total insider cluster sales of $889K (both trades combined) represent ~0.08% of $1.1B market cap
- No 10b5-1 plan or regular pattern identified in the sales
Financial Impact
Insider sales of $889K total, representing ~0.08% of market cap — modest in absolute terms but notable for C-suite cluster
Risk Factors
- Insider sales may reflect personal liquidity needs rather than negative outlook
- Modest dollar amount relative to market cap limits signal strength
- No 10b5-1 plan identified, but sales could be routine portfolio rebalancing
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-1787810674728 |
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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