The magnitude and concentration of sales—especially by the CEO and CCO—suggest potential lack of confidence in near-term prospects. Traders should monitor for upcoming earnings, guidance changes, or clinical trial updates that may have prompted this activity.
Price Chart
Executive Summary
Multiple C-suite executives at Castle Biosciences sold shares in a concentrated 7-day window, including the CEO selling over $1 million in open-market transactions. The total value of sales exceeds $1.5 million, representing a notable insider selling cluster.
Key Financial Metrics
Key Facts
- CEO Derek Maetzkold sold 17,310 shares for $451,946.79 and another 23,179 shares for $585,941.94 in open-market transactions.
- Chief Commercial Officer Juvenal Tobin sold 20,863 shares for $526,582.12.
- CEO also exercised derivative securities involving 12,452 shares, with minimal cash outlay ($14,880.14), but those are non-cash events.
- Total open-market sales by insiders: $1.54M over 7 days.
- Total insider sales in the past 30 days now amount to $1.9M.
Financial Impact
$1.54 million in open-market sales by executives, approximately 0.2% of market cap
Risk Factors
- Insider selling can signal overvaluation or anticipation of negative news.
- Concentrated selling by top executives increases perception risk, even if for personal financial planning.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CONTEXT: Insider Cluster Data (5 trades, 7d window) | cluster-CSTL-1773691704268 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 21, 2026 5d ago | Insider Cluster | $33.19 $33.08 | ▼ −0.33% | ▲ +0.19% | $33.08 (−0.33%) |
Oct 5, 2026 21d ago | 144 | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $33.08 (−0.84%) |
Oct 5, 2026 21d ago | Insider Cluster | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $33.08 (−0.84%) |
Sep 23, 2026 4w ago | Insider Cluster | $35.19 $35.81 | ▼ −1.76% | ▼ −1.22% | $33.08 (+6.00%) |
Sep 16, 2026 5w ago | Insider Cluster | $36.78 $35.34 | ▼ −3.92% | ▼ −4.04% | $33.08 (−10.06%) |
Sep 11, 2026 6w ago | 144 | $33.44 $35.50 | ▲ +6.16% | ▲ +6.62% | $33.08 (−1.08%) |
Sep 3, 2026 7w ago | Insider Cluster | $32.91 $32.76 | ▲ +0.46% | ▼ −0.09% | $33.08 (−0.52%) |
Sep 2, 2026 7w ago | Insider Cluster | $32.65 $32.91 | ▲ +0.80% | ▲ +1.18% | $33.08 (+1.32%) |
Sep 1, 2026 7w ago | Insider Cluster | $33.42 $32.65 | ▼ −2.30% | ▼ −3.35% | $33.08 (−1.02%) |
Aug 27, 2026 8w ago | Insider Cluster | $33.50 $33.03 | ▼ −1.40% | ▼ −1.10% | $33.08 (−1.25%) |
US Market Status
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