The insider sales are too small relative to market cap to warrant a bearish read. Monitor the next 8-K or earnings release for any fundamental changes, but this cluster alone does not justify a position adjustment.
Price Chart
Executive Summary
The CEO and CFO of Castle Biosciences collectively sold ~$775K in open-market stock on August 14, 2026. The CFO's sale of $742K is the dominant trade, representing ~0.08% of the company's $915M market cap — below the 0.1% materiality threshold. The CEO's sales are small and partially tied to derivative exercises. This cluster is routine in size and does not signal material negative information.
Key Financial Metrics
Key Facts
- CFO Frank Stokes sold 24,908 shares for $741,511 on August 14, 2026
- CEO Derek Maetzold sold a net ~6,398 shares for ~$192K, partially from derivative exercises
- Total cluster value of ~$775K is ~0.08% of CSTL's $915M market cap
- No 10b5-1 plan or vesting pattern is evident from the data, but the dollar amounts are trivial relative to market cap
Financial Impact
~$775K in insider sales, ~0.08% of market cap
Risk Factors
- Insider sales could accelerate if the stock rallies further
- No fundamental catalyst is apparent from the cluster data
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-1787120450722 |
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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