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 9,836 shares of common stock on July 27, 2026.
Summary
- Option exercise/conversion: acquired 6,214 Common Stock at $2.39 ($14,851) on July 27, 2026; holds 27,693 after (Direct).
- Open-market sale: disposed of 5,982 Common Stock at $24.13 ($144,346) on July 27, 2026; holds 21,711 after (Direct).
- Open-market sale: disposed of 1,307 Common Stock at $24.13 ($31,538) on July 27, 2026; holds 38,046 after (Indirect).
- Open-market sale: disposed of 1,110 Common Stock at $24.13 ($26,784) on July 27, 2026; holds 32,339 after (Indirect).
- Open-market sale: disposed of 268 Common Stock at $24.13 ($6,467) on July 27, 2026; holds 11,822 after (Indirect).
- Open-market sale: disposed of 268 Common Stock at $24.13 ($6,467) on July 27, 2026; holds 11,822 after (Indirect).
- Open-market sale: disposed of 268 Common Stock at $24.13 ($6,467) on July 27, 2026; holds 11,822 after (Indirect).
- Open-market sale: disposed of 268 Common Stock at $24.13 ($6,467) on July 27, 2026; holds 11,822 after (Indirect).
- Open-market sale: disposed of 232 Common Stock at $25.06 ($5,814) on July 27, 2026; holds 21,479 after (Direct).
- Open-market sale: disposed of 50 Common Stock at $25.06 ($1,253) on July 27, 2026; holds 37,996 after (Indirect).
- Open-market sale: disposed of 43 Common Stock at $25.06 ($1,078) on July 27, 2026; holds 32,296 after (Indirect).
- Open-market sale: disposed of 10 Common Stock at $25.06 ($251) on July 27, 2026; holds 11,812 after (Indirect).
- Open-market sale: disposed of 10 Common Stock at $25.06 ($251) on July 27, 2026; holds 11,812 after (Indirect).
- Open-market sale: disposed of 10 Common Stock at $25.06 ($251) on July 27, 2026; holds 11,812 after (Indirect).
- Open-market sale: disposed of 10 Common Stock at $25.06 ($251) on July 27, 2026; holds 11,812 after (Indirect).
- Option exercise/conversion: disposed of 6,214 Stock option (right to buy) on July 27, 2026; holds 78,903 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $237,682 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 |
|---|---|---|---|---|---|---|
| 2026-07-27 | Option exercise/conversion | Common Stock | 6,214 | $2 | $14.9K | 27,693 |
| 2026-07-27 | Open-market sale | Common Stock | 5,982 | $24 | $144.3K | 21,711 |
| 2026-07-27 | Open-market sale | Common Stock | 1,307 | $24 | $31.5K | 38,046 |
| 2026-07-27 | Open-market sale | Common Stock | 1,110 | $24 | $26.8K | 32,339 |
| 2026-07-27 | Open-market sale | Common Stock | 268 | $24 | $6.5K | 11,822 |
| 2026-07-27 | Open-market sale | Common Stock | 268 | $24 | $6.5K | 11,822 |
| 2026-07-27 | Open-market sale | Common Stock | 268 | $24 | $6.5K | 11,822 |
| 2026-07-27 | Open-market sale | Common Stock | 268 | $24 | $6.5K | 11,822 |
| 2026-07-27 | Open-market sale | Common Stock | 232 | $25 | $5.8K | 21,479 |
| 2026-07-27 | Open-market sale | Common Stock | 50 | $25 | $1.3K | 37,996 |
| 2026-07-27 | Open-market sale | Common Stock | 43 | $25 | $1.1K | 32,296 |
| 2026-07-27 | Open-market sale | Common Stock | 10 | $25 | $251 | 11,812 |
| 2026-07-27 | Open-market sale | Common Stock | 10 | $25 | $251 | 11,812 |
| 2026-07-27 | Open-market sale | Common Stock | 10 | $25 | $251 | 11,812 |
| 2026-07-27 | Open-market sale | Common Stock | 10 | $25 | $251 | 11,812 |
| 2026-07-27 | Option exercise/conversion | Stock option (right to buy) | 6,214 | — | — | 78,903 |
Key Dates
| Date | Description |
|---|---|
| 2026-07-27 | Option exercise/conversion (6,214 shares) |
| 2026-07-27 | Open-market sale (5,982 shares) |
| 2026-07-27 | Open-market sale (1,307 shares) |
| 2026-07-27 | Open-market sale (1,110 shares) |
| 2026-07-27 | Open-market sale (268 shares) |
| 2026-07-27 | Open-market sale (268 shares) |
| 2026-07-27 | Open-market sale (268 shares) |
| 2026-07-27 | Open-market sale (268 shares) |
| 2026-07-27 | Open-market sale (232 shares) |
| 2026-07-27 | Open-market sale (50 shares) |
| 2026-07-27 | Open-market sale (43 shares) |
| 2026-07-27 | Open-market sale (10 shares) |
| 2026-07-27 | Open-market sale (10 shares) |
| 2026-07-27 | Open-market sale (10 shares) |
| 2026-07-27 | Open-market sale (10 shares) |
| 2026-07-27 | Option exercise/conversion (6,214 shares) |
Keywords
insider transaction, Form 4, CSTL, CASTLE BIOSCIENCES INC, bearish, Derek J Maetzold
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