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 7,232 shares of common stock on August 14, 2026 for $30.02 per share.
Summary
- Option exercise/conversion: acquired 1,100 Common Stock at $2.39 ($2,629) on August 14, 2026; holds 22,579 after (Direct).
- Open-market sale: disposed of 1,100 Common Stock at $30.02 ($33,022) on August 14, 2026; holds 21,479 after (Direct).
- Open-market sale: disposed of 2,714 Common Stock at $30.02 ($81,474) on August 14, 2026; holds 20,355 after (Indirect).
- Open-market sale: disposed of 2,306 Common Stock at $30.02 ($69,226) on August 14, 2026; holds 17,301 after (Indirect).
- Open-market sale: disposed of 278 Common Stock at $30.02 ($8,346) on August 14, 2026; holds 11,534 after (Indirect).
- Open-market sale: disposed of 278 Common Stock at $30.02 ($8,346) on August 14, 2026; holds 11,534 after (Indirect).
- Open-market sale: disposed of 278 Common Stock at $30.02 ($8,346) on August 14, 2026; holds 11,534 after (Indirect).
- Open-market sale: disposed of 278 Common Stock at $30.02 ($8,346) on August 14, 2026; holds 11,534 after (Indirect).
- Option exercise/conversion: disposed of 1,100 Stock option (right to buy) on August 14, 2026; holds 37,757 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $217,105 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 |
|---|---|---|---|---|---|---|
| 2026-08-14 | Option exercise/conversion | Common Stock | 1,100 | $2 | $2.6K | 22,579 |
| 2026-08-14 | Open-market sale | Common Stock | 1,100 | $30 | $33.0K | 21,479 |
| 2026-08-14 | Open-market sale | Common Stock | 2,714 | $30 | $81.5K | 20,355 |
| 2026-08-14 | Open-market sale | Common Stock | 2,306 | $30 | $69.2K | 17,301 |
| 2026-08-14 | Open-market sale | Common Stock | 278 | $30 | $8.3K | 11,534 |
| 2026-08-14 | Open-market sale | Common Stock | 278 | $30 | $8.3K | 11,534 |
| 2026-08-14 | Open-market sale | Common Stock | 278 | $30 | $8.3K | 11,534 |
| 2026-08-14 | Open-market sale | Common Stock | 278 | $30 | $8.3K | 11,534 |
| 2026-08-14 | Option exercise/conversion | Stock option (right to buy) | 1,100 | — | — | 37,757 |
Key Dates
| Date | Description |
|---|---|
| 2026-08-14 | Option exercise/conversion (1,100 shares) |
| 2026-08-14 | Open-market sale (1,100 shares) |
| 2026-08-14 | Open-market sale (2,714 shares) |
| 2026-08-14 | Open-market sale (2,306 shares) |
| 2026-08-14 | Open-market sale (278 shares) |
| 2026-08-14 | Open-market sale (278 shares) |
| 2026-08-14 | Open-market sale (278 shares) |
| 2026-08-14 | Open-market sale (278 shares) |
| 2026-08-14 | Option exercise/conversion (1,100 shares) |
Keywords
insider transaction, Form 4, CSTL, CASTLE BIOSCIENCES INC, bearish, Derek J Maetzold
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