Castle Biosciences Form 4: Maetzold Disposes 1,339 Shares Under 10b5-1
Rhea-AI Filing Summary
Derek J. Maetzold, President & Chief Executive Officer and a director of Castle Biosciences, Inc. (CSTL), sold 1,339 shares of the issuer's common stock on 09/02/2025 under a Rule 10b5-1 trading plan adopted May 8, 2025. The transaction executed in multiple trades produced a weighted-average sale price of $23.93 per share. Following the sale, the filing reports 67,005 shares held directly and multiple indirect trust holdings disclosed by name and amount, including 52,923 shares held by The Maetzold Descendants 2020 Trust and other family trusts and grantor retained annuity trusts. The Form 4 was signed by attorney-in-fact Frank Stokes on 09/04/2025.
Positive
- Transaction executed under a Rule 10b5-1 trading plan, indicating a pre-established schedule for the disposition.
- Weighted-average sale price disclosed ($23.93) and provided price range ($23.790.00), with an undertaking to provide detailed trade information upon request.
- Comprehensive disclosure of indirect holdings across named family trusts and grantor retained annuity trusts, including trustee/beneficiary relationships.
Negative
- None.
Insights
TL;DR: Insider sale under a pre-existing 10b5-1 plan; small single-day disposition relative to total reported holdings.
The filing documents a sale of 1,339 common shares at a weighted-average price of $23.93 executed pursuant to a Rule 10b5-1 plan adopted May 8, 2025. The report discloses both direct ownership (67,005 shares) and multiple indirect trust holdings by family and grantor retained annuity trusts. The filing provides the execution price range ($23.79–$24.00) and an undertaking to provide detailed trade-by-trade information upon request, which supports transparency. Based solely on the disclosed figures, the transaction appears to be a routine, pre-planned disposition rather than an unscheduled open-market sale.
TL;DR: Proper compliance with disclosure rules and 10b5-1 designation; family trust structures are fully disclosed.
The Form 4 identifies the reporting persons roles as President & CEO and director and clearly marks the sale as executed pursuant to a 10b5-1 plan. The filing itemizes indirect holdings across named trusts and indicates trustee relationships and beneficiaries, which enhances governance transparency. The signature by an attorney-in-fact is present and dated, fulfilling filing formalities. From a governance standpoint, the disclosure is complete within the information provided.
Insider Trade Summary
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Sale | Common Stock | 1,339 | $23.93 | $32K |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
Footnotes (1)
- These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on May 8, 2025 This transaction was executed in multiple trades at prices ranging from $23.79 to $24.00, 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. 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. Held by Derek Maetzold 2020 Irrevocable Trust of which the Reporting Person is the trustee and his children are beneficiaries. 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. 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. 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. 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. Held by DJM Grantor Retained Annuity Trust No. 5 of which the Reporting Person is the trustee and beneficiary. 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. Held by DJM Grantor Retained Annuity Trust No. 7 of which the Reporting Person is the trustee and beneficiary.
