MAETZOLD DEREK J 4
4 · CASTLE BIOSCIENCES INC · Filed Jun 3, 2026
Research Summary
AI-generated summary of this filing
Castle Biosciences (CSTL) CEO Derek Maetzold Sells Shares After Option Exercise
What Happened
Derek J. Maetzold, President & CEO and a director of Castle Biosciences (CSTL), exercised vested options covering 6,214 shares at an exercise price of $2.39 per share (total exercise cost about $14,852) on June 1, 2026. He sold a total of 9,836 shares in open-market transactions that same day for aggregate proceeds of approximately $205,148 (weighted-average sale price $20.86).
Key Details
- Transaction date: June 1, 2026; Form 4 filed June 3, 2026 (timely).
- Options exercised: 6,214 shares at $2.39 per share (codes: M). Options are fully vested (footnote F12).
- Open-market sales: 9,836 shares sold (code: S) for total proceeds ≈ $205,148; weighted-average sale price $20.86; trade prices ranged $20.47–$21.175 (footnote F2).
- Some derivative entries in the filing show $0 disposals tied to the option conversions (accounting for the exercise/conversion).
- Transactions were made pursuant to a Rule 10b5-1 trading plan adopted Dec 3, 2025 (footnote F1).
- Several footnotes (F3–F11) indicate portions of holdings are held in family trusts for which Maetzold is trustee or beneficiary.
- Shares owned after the transactions are not specified in the provided excerpt.
Context
The filing shows an option exercise combined with immediate open-market sales under a pre-established 10b5-1 plan. Because the number of shares sold exceeds the shares acquired via exercise, some sales were of previously held shares. Exercises and subsequent sales under a 10b5-1 plan are commonly routine and do not, by themselves, indicate a change in the insider’s view of the company.
Insider Transaction Report
- Exercise/Conversion
Common Stock
[F1]2026-06-01$2.39/sh+204$488→ 21,683 total - Exercise/Conversion
Common Stock
[F1]2026-06-01$2.39/sh+6,010$14,364→ 27,693 total - Sale
Common Stock
[F1][F2]2026-06-01$20.86/sh−6,214$129,605→ 21,479 total - Sale
Common Stock
[F1][F2][F3]2026-06-01$20.86/sh−1,357$28,303→ 43,424 total(indirect: By Trust) - Sale
Common Stock
[F1][F2][F4]2026-06-01$20.86/sh−1,153$24,048→ 36,908 total(indirect: By Trust) - Sale
Common Stock
[F1][F2][F5]2026-06-01$20.86/sh−278$5,798→ 1,668 total(indirect: By Trust) - Sale
Common Stock
[F1][F2][F6]2026-06-01$20.86/sh−278$5,798→ 1,668 total(indirect: By Trust) - Sale
Common Stock
[F1][F2][F7]2026-06-01$20.86/sh−278$5,798→ 1,668 total(indirect: By Trust) - Sale
Common Stock
[F1][F2][F8]2026-06-01$20.86/sh−278$5,798→ 1,668 total(indirect: By Trust) - Exercise/Conversion
Stock option (right to buy)
[F1][F12]2026-06-01−204→ 0 totalExercise: $2.39Exp: 2028-11-11→ Common Stock (204 underlying) - Exercise/Conversion
Stock option (right to buy)
[F1][F12]2026-06-01−6,010→ 92,431 totalExercise: $2.39Exp: 2028-05-09→ Common Stock (6,010 underlying)
- 85,959(indirect: By Trust)
Common Stock
[F9] - 18,718(indirect: By Trust)
Common Stock
[F10] - 44,323(indirect: By Trust)
Common Stock
[F11]
Footnotes (12)
- [F1]These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 3, 2025.
- [F10]Held by DJM Grantor Retained Annuity Trust No. 6 of which the Reporting Person is the trustee and the beneficiaries are The Maetzold 2018 Remainder Trust FBO John Derek Maetzold, The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk, The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold and The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold.
- [F11]Held by DJM Grantor Retained Annuity Trust No. 7 of which the Reporting Person is the trustee and beneficiary.
- [F12]The shares subject to the option are fully vested.
- [F2]This transaction was executed in multiple trades at prices ranging from $20.470 to $21.175, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
- [F3]Held by The Maetzold Descendants 2020 Trust of which the Reporting Person's spouse is the trustee and the Reporting Person's spouse and their children are beneficiaries.
- [F4]Held by Derek Maetzold 2020 Irrevocable Trust of which the Reporting Person is the trustee and his children are beneficiaries.
- [F5]Held by The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk of which the Reporting Person is the trustee and his child is the beneficiary.
- [F6]Held by The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.
- [F7]Held by The Maetzold 2018 Remainder Trust FBO John Derek Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.
- [F8]Held by The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.
- [F9]Held by DJM Grantor Retained Annuity Trust No. 5 of which the Reporting Person is the trustee and beneficiary.