CEO-led selling at over $1M is notable, especially near recent price levels. Traders should watch for any follow-up filings or commentary ahead of earnings. While not massive in absolute terms, the concentration in the CEO and proximity to current trading levels may signal reduced confidence in near-term upside.
Price Chart
Executive Summary
Castle Biosciences CEO Derek Maetzold sold a total of 40,489 shares in the past week, generating approximately $1.04 million in proceeds from open-market transactions. This includes two separate sales at prices between $25.28 and $26.11, following the exercise of derivative securities. The total value of the sales represents about 0.14% of the company's $753M market cap.
Key Financial Metrics
Key Facts
- CEO Derek Maetzold sold 40,489 shares in two open-market transactions on March 11 and 12, 2026.
- Total proceeds from the sales were $1,037,888.73.
- The sales represent approximately 0.14% of CSTL's $753M market capitalization.
- Concurrent with the sales, Maetzold exercised derivative securities for 12,452 shares, with a nominal cost basis of $2.39 and $0 per share.
- No other insiders participated in this cluster — activity is isolated to the CEO.
Financial Impact
$1.04 million in insider selling by CEO; no capital inflow to company
Risk Factors
- Insider selling can signal negative sentiment, particularly when concentrated in the CEO.
- Potential for downward price pressure if additional insiders sell or if institutional investors interpret this as a bearish signal.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CONTEXT: Insider Cluster Data (4 trades, 7d window) | cluster-CSTL-1773432661899 |
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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