Form 4: Castle Biosciences Executive Sells Shares
Insider Transaction (Form 4)
Derek J Maetzold, Pres. & Chief Exec. Officer and a Director of Castle Biosciences Inc, sold 14,496 shares of common stock on September 21, 2026 for $35.33 per share.
Summary
- Option exercise/conversion: acquired 8,580 Common Stock at $2.39 ($20,506) on September 21, 2026; holds 30,059 after (Direct).
- Open-market sale: disposed of 8,580 Common Stock at $35.33 ($303,166) on September 21, 2026; holds 21,479 after (Direct).
- Open-market sale: disposed of 3,198 Common Stock at $35.33 ($112,998) on September 21, 2026; holds 11,236 after (Indirect).
- Open-market sale: disposed of 2,718 Common Stock at $35.33 ($96,038) on September 21, 2026; holds 9,550 after (Indirect).
- Option exercise/conversion: disposed of 8,580 Stock option (right to buy) on September 21, 2026; holds 8,165 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $512,202 of stock under a pre-arranged Rule 10b5-1 plan, which is typically routine.
Insider Transactions
Derek J Maetzold — Director, Officer (Pres. & Chief Exec. Officer)
Transaction made under a Rule 10b5-1 trading plan.
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-09-21 | Option exercise/conversion | Common Stock | 8,580 | $2 | $20.5K | 30,059 |
| 2026-09-21 | Open-market sale | Common Stock | 8,580 | $35 | $303.2K | 21,479 |
| 2026-09-21 | Open-market sale | Common Stock | 3,198 | $35 | $113.0K | 11,236 |
| 2026-09-21 | Open-market sale | Common Stock | 2,718 | $35 | $96.0K | 9,550 |
| 2026-09-21 | Option exercise/conversion | Stock option (right to buy) | 8,580 | — | — | 8,165 |
Key Dates
| Date | Description |
|---|---|
| 2026-09-21 | Option exercise/conversion (8,580 shares) |
| 2026-09-21 | Open-market sale (8,580 shares) |
| 2026-09-21 | Open-market sale (3,198 shares) |
| 2026-09-21 | Open-market sale (2,718 shares) |
| 2026-09-21 | Option exercise/conversion (8,580 shares) |
Keywords
insider transaction, Form 4, CSTL, CASTLE BIOSCIENCES INC, bearish, Derek J Maetzold
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