Castle Biosciences Insider Trades
NASDAQ: CSTLHealth CareMedical SpecialitiesUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
After hours: 34.42 0.00%
Last 12 months
- Purchases
- 0 · $0
- Sales
- 3 · $515.56K
- Shares bought / sold
- 0 / 14.50K
- Net activity
- Net selling $515,565
Castle Biosciences insider activity
Over the last 12 months, Castle Biosciences insiders reported 4 transactions on SEC Form 4: 0 open-market purchases and 3 sales. Insiders bought $0 and sold $515,565 worth of stock, for net insider selling of $515,565. The largest seller was MAETZOLD DEREK J, with $515,565 in reported sales.
The most recent filing shows MAETZOLD DEREK J (Pres. & Chief Exec. Officer) reporting a transaction in 8,165 shares at $2.39 on Oct 5, 2026. Insider sales are common for compensation, tax and diversification reasons, while open-market purchases are rarer; tracking both helps put CSTL's ownership changes in context.
Summary generated from market data by MetaCap's automated system. Methodology
CSTL insider transactions
| Date | Insider | Type | Shares | Value | Filing |
|---|---|---|---|---|---|
| Oct 5, 2026 | MAETZOLD DEREK JPres. & Chief Exec. Officer | Sale | 2,718 | $96.67K | Form 4 |
| Oct 5, 2026 | MAETZOLD DEREK JPres. & Chief Exec. Officer | Sale | 3,198 | $113.74K | Form 4 |
| Oct 5, 2026 | MAETZOLD DEREK JPres. & Chief Exec. Officer | Sale | 8,580 | $305.16K | Form 4 |
| Oct 5, 2026 | MAETZOLD DEREK JPres. & Chief Exec. Officer | Option exercise | 8,165 | $19.51K | Form 4 |
Transaction codes follow SEC Form 4: P = open-market purchase, S = open-market sale, A = grant or award, M = option exercise, F = shares withheld for taxes. About Form 4