Insider selling at this scale is routine and non-informative. Monitor the next quarterly filing for any fundamental changes, but this cluster alone does not warrant a trading action.
Price Chart
Executive Summary
Three C-suite insiders at Castle Biosciences (CEO, COO, CCO) sold a total of ~$293K in open-market shares over a 7-day window ending August 3, 2026. The CEO's sales were part of a derivative exercise-and-sell pattern, while the COO and CCO sold directly. At ~0.03% of the $929M market cap, the dollar value is trivial and likely reflects routine portfolio diversification and tax planning, not a bearish signal.
Key Financial Metrics
Key Facts
- CEO Derek Maetzold sold ~$128K in open-market shares on Aug 3, 2026, alongside derivative exercises at $2.39 and $0 strike prices
- COO Kristen Oelschlager sold ~$256K in three trades on Aug 3, 2026 at prices between $29.12 and $30.62
- CCO Tobin Juvenal sold ~$49K on Aug 3, 2026 at $28.25, following ~$507K in sales on Jul 31, 2026
- Total cluster open-market sales: ~$293K, representing ~0.03% of the $929M market cap
- Analyst consensus is 93% bullish (14 Buy, 1 Hold) with no Sell ratings
Financial Impact
~$293K in insider sales over 7 days, ~0.03% of market cap — trivial
Risk Factors
- Insider sales could accelerate if the stock price rises further, creating overhead supply
- The CEO's derivative exercises and concurrent sales may indicate a lack of conviction at current levels, though the dollar amount is immaterial
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-1786003895804 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 21, 2026 5d ago | Insider Cluster | $33.19 $33.08 | ▼ −0.33% | ▲ +0.19% | $34.02 (+2.50%) |
Oct 5, 2026 21d ago | 144 | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $34.02 (+1.98%) |
Oct 5, 2026 21d ago | Insider Cluster | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $34.02 (+1.98%) |
Sep 23, 2026 4w ago | Insider Cluster | $35.19 $35.81 | ▼ −1.76% | ▼ −1.22% | $34.02 (+3.32%) |
Sep 16, 2026 5w ago | Insider Cluster | $36.78 $35.34 | ▼ −3.92% | ▼ −4.04% | $34.02 (−7.50%) |
Sep 11, 2026 6w ago | 144 | $33.44 $35.50 | ▲ +6.16% | ▲ +6.62% | $34.02 (+1.73%) |
Sep 3, 2026 7w ago | Insider Cluster | $32.91 $32.76 | ▲ +0.46% | ▼ −0.09% | $34.02 (−3.37%) |
Sep 2, 2026 7w ago | Insider Cluster | $32.65 $32.91 | ▲ +0.80% | ▲ +1.18% | $34.02 (+4.20%) |
Sep 1, 2026 7w ago | Insider Cluster | $33.42 $32.65 | ▼ −2.30% | ▼ −3.35% | $34.02 (+1.80%) |
Aug 27, 2026 8w ago | Insider Cluster | $33.50 $33.03 | ▼ −1.40% | ▼ −1.10% | $34.02 (+1.55%) |
US Market Status
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