Castle Biosciences CEO and trusts sell 14,496 shares
Maetzold's sales were made under a Rule 10b5-1 plan adopted June 2, 2026.
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Form Type
4
Rhea-AI Filing Summary
Castle Biosciences Inc. (CSTL) President and CEO Derek J. Maetzold reported six sales totaling 14,496 common shares on November 2, 2026. He sold 7,555 shares directly and 1,025 directly; The Maetzold Descendants 2020 Trust sold 2,816 and 382 shares, and Derek Maetzold 2020 Irrevocable Trust sold 2,393 and 325 shares. The first three quantities had a weighted-average sale price of $36.005 per share; the latter three, $36.814.
All six sales were made pursuant to a Rule 10b5-1 plan adopted June 2, 2026. Separately reported indirect holdings included 11,256 shares in each of four Maetzold 2018 Remainder Trusts and 11,963, 27,862, 40,935 and 23,216 shares in DJM Grantor Retained Annuity Trust Nos. 6 through 9, respectively.
Insider Trade Summary 10b5-1
Net Seller: 14,496 shares
Net Sell
6 txns
Insider
MAETZOLD DEREK J
Role
Pres. & Chief Exec. Officer
Sold
14,496 shs ($523K)
Share of Position Sold
67.6%
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Sale | Common Stock F1, F2 | 7,555 | $36.005 | $272K |
| Sale | Common Stock F1, F2, F3 | 2,816 | $36.005 | $101K |
| Sale | Common Stock F1, F2, F4 | 2,393 | $36.005 | $86K |
| Sale | Common Stock F1, F5 | 1,025 | $36.814 | $38K |
| Sale | Common Stock F1, F5, F3 | 382 | $36.814 | $14K |
| Sale | Common Stock F1, F5, F4 | 325 | $36.814 | $12K |
| Holding | Common Stock F6 | -- | -- | -- |
| Holding | Common Stock F7 | -- | -- | -- |
| Holding | Common Stock F8 | -- | -- | -- |
| Holding | Common Stock F9 | -- | -- | -- |
| Holding | Common Stock F10 | -- | -- | -- |
| Holding | Common Stock F11 | -- | -- | -- |
| Holding | Common Stock F12 | -- | -- | -- |
| Holding | Common Stock F13 | -- | -- | -- |
Holdings After Transaction:
Common Stock — 3,904 shares (Direct);
Common Stock — 1,642 shares (Indirect, By The Maetzold Descendants 2020 Trust);
Common Stock — 1,396 shares (Indirect, By Derek Maetzold 2020 Irrevocable Trust);
Common Stock — 11,256 shares (Indirect, By The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk);
Common Stock — 11,256 shares (Indirect, By The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold);
Common Stock — 11,256 shares (Indirect, By The Maetzold 2018 Remainder Trust FBO John Derek Maetzold);
Common Stock — 11,256 shares (Indirect, By The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold);
Common Stock — 11,963 shares (Indirect, By DJM Grantor Retained Annuity Trust No. 6);
Common Stock — 27,862 shares (Indirect, By DJM Grantor Retained Annuity Trust No. 7);
Common Stock — 40,935 shares (Indirect, By DJM Grantor Retained Annuity Trust No. 8);
Common Stock — 23,216 shares (Indirect, DJM Grantor Retained Annuity Trust No. 9)
Holdings Before and After:
Common Stock, 12,484 to 3,904 shares (Direct);
Common Stock, 4,840 to 1,642 shares (Indirect, By The Maetzold Descendants 2020 Trust);
Common Stock, 4,114 to 1,396 shares (Indirect, By Derek Maetzold 2020 Irrevocable Trust)
Other Insiders: 1 other insider reported open-market sales of this stock in the 30 days up to this filing.
Footnotes (13)
- F1. These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on June 2, 2026.
- F2. This transaction was executed in multiple trades at prices ranging from $35.610 to $36.593, 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. This transaction was executed in multiple trades at prices ranging from $36.610 to $37.030, 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.
- F6. 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.
- F7. 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.
- F8. 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.
- F9. 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.
- 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. Held by DJM Grantor Retained Annuity Trust No. 8 of which the Reporting Person is the trustee and beneficiary.
- F13. Held by DJM Grantor Retained Annuity Trust No. 9 of which the Reporting Person is the trustee and beneficiary.
Key Figures
Total shares sold: 14,496 shares
Direct shares sold; weighted-average sale price: 7,555 shares at $36.005 per share
Trust shares sold; weighted-average sale price: 2,816 shares at $36.005 per share
+5 more
8 metrics
Total shares sold
14,496 shares
Six sales on November 2, 2026
Direct shares sold; weighted-average sale price
7,555 shares at $36.005 per share
Derek J. Maetzold; November 2, 2026
Trust shares sold; weighted-average sale price
2,816 shares at $36.005 per share
The Maetzold Descendants 2020 Trust; November 2, 2026
Trust shares sold; weighted-average sale price
2,393 shares at $36.005 per share
Derek Maetzold 2020 Irrevocable Trust; November 2, 2026
Direct shares sold; weighted-average sale price
1,025 shares at $36.814 per share
Derek J. Maetzold; November 2, 2026
Trust shares sold; weighted-average sale price
382 shares at $36.814 per share
The Maetzold Descendants 2020 Trust; November 2, 2026
Trust shares sold; weighted-average sale price
325 shares at $36.814 per share
Derek Maetzold 2020 Irrevocable Trust; November 2, 2026
Rule 10b5-1 plan adoption date
June 2, 2026
Plan pursuant to which the six sales were made
Key Terms
Rule 10b5-1 plan, weighted-average sale price, Grantor Retained Annuity Trust, trustee
4 terms
Rule 10b5-1 plan regulatory
"made pursuant to a Rule 10b5-1 plan"
A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.
weighted-average sale price financial
"reflects the weighted-average sale price"
Grantor Retained Annuity Trust technical
"By DJM Grantor Retained Annuity Trust No. 6"
A grantor retained annuity trust (GRAT) is an estate-planning tool where the person who creates the trust transfers assets into it but receives fixed cash payments (an annuity) from the trust for a set number of years; whatever remains after that term passes to designated beneficiaries. It matters to investors because it can shift future appreciation of assets out of the creator’s taxable estate—like putting an asset into a timed vending machine that pays you fixed amounts while any extra value that grows inside the machine goes to heirs with reduced gift or estate tax consequences.
trustee technical
"of which the Reporting Person's spouse is the trustee"
A trustee is a person or institution legally appointed to hold and manage assets or enforce an agreement on behalf of other people (beneficiaries). Think of a trustee as a neutral referee or custodian who must act in the beneficiaries’ best interests, follow the trust or contract rules, and handle distributions, recordkeeping and enforcement. Investors care because a trustworthy trustee protects their rights, ensures promised payments or remedies are delivered, and can influence recoveries if things go wrong.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What price ranges were reported for the CSTL sales?
The trades with a reported weighted-average sale price of $36.005 per share ranged from $35.610 to $36.593, inclusive. Those with a reported weighted-average price of $36.814 per share ranged from $36.610 to $37.030, inclusive. Each reported price reflects multiple trades.
AI-generated analysis. How Rhea-AI works. Not financial advice.
