Sales are small in absolute and relative terms — no material signal. Monitor next earnings or catalyst event for any change in insider behavior.
Price Chart
Executive Summary
Two C-suite insiders at Castle Biosciences sold a total of ~$136K in open-market sales over a 3-day period. The Chief Commercial Officer sold ~$232K across two transactions, and the Chief Operating Officer sold ~$100K in a single trade. Relative to the company's ~$326M market cap, these sales represent ~0.04% — well below the 0.1% materiality threshold, making them routine and non-informative.
Key Financial Metrics
Key Facts
- Chief Commercial Officer Juvenal Tobin sold 6,577 shares total (~$232K) on Sep 29-30, 2026
- Chief Operating Officer Kristen Oelschlager sold 2,800 shares (~$100K) on Oct 1, 2026
- Total insider sales of ~$136K represent ~0.04% of market cap — trivial
- No 10b5-1 plan indication; sales are open-market (code S)
- No insider purchases in the cluster
Financial Impact
~$136K in total insider sales, ~0.04% of market cap
Risk Factors
- Insider sales could accelerate if upcoming data readout disappoints
- No insider buying to signal confidence
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-CSTL-1791230894166 |
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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