Castle Biosciences CEO Maetzold sells 14,496 shares
The chief executive's sales were made under a plan adopted June 2, 2026, with shares remaining in direct and trust holdings.
Sentiment and the balance of points
Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.
Form Type
4
Rhea-AI Filing Summary
Castle Biosciences Inc. President and CEO Derek J. Maetzold reported selling 14,496 common shares on October 19, 2026, at a weighted-average price of $31.91 per share under a Rule 10b5-1 plan adopted June 2, 2026. The sales were executed in multiple trades at prices ranging from $31.67 to $32.53. The transactions included 8,580 shares held directly, 3,198 held by The Maetzold Descendants 2020 Trust, and 2,718 held by Derek Maetzold 2020 Irrevocable Trust. After the sales, reported holdings were 12,484 directly held shares, 4,840 shares in the Descendants trust, and 4,114 shares in the Irrevocable Trust.
Insider Trade Summary 10b5-1
Net Seller: 14,496 shares
Net Sell
11 txns
Insider
MAETZOLD DEREK J
Role
Pres. & Chief Exec. Officer
Sold
14,496 shs ($463K)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Sale | Common Stock F1, F2 | 8,580 | $31.91 | $274K |
| Sale | Common Stock F1, F2, F3 | 3,198 | $31.91 | $102K |
| Sale | Common Stock F1, F2, F4 | 2,718 | $31.91 | $87K |
| holding | Common Stock F5 | -- | -- | -- |
| 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 | -- | -- | -- |
Holdings After Transaction:
Common Stock — 12,484 shares (Direct);
Common Stock — 4,840 shares (Indirect, By The Maetzold Descendants 2020 Trust);
Common Stock — 4,114 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)
Footnotes (12)
- 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 $31.67 to $32.53, 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. 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.
- F10. Held by DJM Grantor Retained Annuity Trust No. 7 of which the Reporting Person is the trustee and beneficiary.
- F11. Held by DJM Grantor Retained Annuity Trust No. 8 of which the Reporting Person is the trustee and beneficiary.
- F12. Held by DJM Grantor Retained Annuity Trust No. 9 of which the Reporting Person is the trustee and beneficiary.
Key Figures
Common shares sold: 14,496 shares
Weighted-average sale price: $31.91 per share
Direct shares sold: 8,580 shares
+5 more
8 metrics
Common shares sold
14,496 shares
Reported for October 19, 2026
Weighted-average sale price
$31.91 per share
Reported for October 19, 2026
Direct shares sold
8,580 shares
Reported for October 19, 2026
Direct shares held after sale
12,484 shares
Reported after the October 19, 2026 transaction
Descendants trust shares sold
3,198 shares
Held by The Maetzold Descendants 2020 Trust; reported for October 19, 2026
Descendants trust shares held after sale
4,840 shares
Reported after the October 19, 2026 transaction
Irrevocable trust shares sold
2,718 shares
Held by Derek Maetzold 2020 Irrevocable Trust; reported for October 19, 2026
Irrevocable trust shares held after sale
4,114 shares
Reported after the October 19, 2026 transaction
Key Terms
Rule 10b5-1 plan, weighted-average sale price, Irrevocable Trust, Grantor Retained Annuity Trust
4 terms
Rule 10b5-1 plan regulatory
"made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person"
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
"The price reported above reflects the weighted-average sale price"
Irrevocable Trust financial
"Derek Maetzold 2020 Irrevocable Trust"
An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.
Grantor Retained Annuity Trust financial
"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.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
AI-generated analysis. How Rhea-AI works. Not financial advice.
