// company-profile
Castle Biosciences Inc
CSTL// activity-summary
Recent insider activity is bullish. Over the last 30 days, 7 insiders purchased shares. Buying was led by Cole G Bradley.
// 90-day insight
Over the last 90 days, Castle Biosciences Inc insiders bought $38K across 23 transactions with no open-market sales.
- Most active insider: MAETZOLD DEREK J with 26 transactions totaling $346K.
- Largest single sale: $178K by Oelschlager Kristen M on Jun 16, 2026.
- 100% of recent sales were pre-scheduled 10b5-1 trades — typically less informative than open-market activity.
Activity skews bullish — buys outpace sales.
Institutional Ownership
Top 13F-HR holders of Castle Biosciences Inc as of 2026-03-31
Data source: SEC Form 13F-HR filings. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 16, 2026 | Oelschlager Kristen M | CSTL | Sale10b5 | 8,587 | $20.71 | $178K |
| Jun 15, 2026 | MAETZOLD DEREK J | CSTL | Sale10b5 | 1,153 | $20.66 | $24K |
| Jun 15, 2026 | MAETZOLD DEREK J | CSTL | Option Exercise10b5 | 550 | $2.39 | $1K |
| Jun 15, 2026 | MAETZOLD DEREK J | CSTL | Sale10b5 | 550 | $20.66 | $11K |
| Jun 15, 2026 | MAETZOLD DEREK J | CSTL | Sale10b5 | 1,357 | $20.66 | $28K |
45 more transactions hidden
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