The CEO's sale is the larger of the two but still modest relative to market cap. Without a 10b5-1 plan disclosure, these could be liquidity-driven. Monitor next 10-Q for any fundamental deterioration, but this cluster alone does not warrant a bearish read.
Price Chart
Executive Summary
Two Castle Biosciences insiders, including the CEO, sold a combined $384K in open-market sales over a one-week window. The CEO's $274K sale represents the bulk of the activity, while the CCO's $111K sale occurred a week earlier. At a market cap of approximately $326M, these sales total ~0.12% of market cap, a modest amount that does not signal material negative information.
Key Financial Metrics
Key Facts
- CEO Derek Maetzold sold 8,600 shares at $31.91 for $274K on 2026-10-19
- CCO Tobin Juvenal sold 3,300 shares at $33.64 for $111K on 2026-10-12
- Total insider sales of $384K represent ~0.12% of market cap ($326M)
- Both sales are open-market (code S) with no 10b5-1 plan indicated
Financial Impact
Sales of $384K, or ~0.12% of market cap — modest and routine
Risk Factors
- CEO selling near the stock's recent price could indicate personal portfolio rebalancing, not a negative signal
- No 10b5-1 plan disclosed — sales may be opportunistic but are small in context
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-CSTL-1792613951915 |
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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