Derek J. Maetzold - Aug 8, 2025 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)

Role
Pres. & Chief Exec. Officer, Director
Signature
/s/ Frank Stokes, Attorney-in-fact
Stock symbol
CSTL
Transactions as of
Aug 8, 2025
Transactions value $
-$464,098
Form type
4
Date filed
8/12/2025, 04:32 PM
Previous filing
Jul 1, 2025
Next filing
Aug 15, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
MAETZOLD DEREK J Pres. & Chief Exec. Officer, Director C/O CASTLE BIOSCIENCES, INC., 505 S. FRIENDSWOOD DRIVE, SUITE 401, FRIENDSWOOD /s/ Frank Stokes, Attorney-in-fact 2025-08-12 0001239501

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CSTL Common Stock Options Exercise $0 +67K +96.14% $0.00 137K Aug 8, 2025 Direct F1
transaction CSTL Common Stock Tax liability -$464K -24K -17.54% $19.36 113K Aug 8, 2025 Direct
holding CSTL Common Stock 52.9K Aug 8, 2025 By The Maetzold Descendants 2020 Trust F2
holding CSTL Common Stock 45K Aug 8, 2025 By Derek Maetzold 2020 Irrevocable Trust F3
holding CSTL Common Stock 3.62K Aug 8, 2025 By The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk F4
holding CSTL Common Stock 3.62K Aug 8, 2025 By The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold F5
holding CSTL Common Stock 3.62K Aug 8, 2025 By The Maetzold 2018 Remainder Trust FBO John Derek Maetzold F6
holding CSTL Common Stock 3.62K Aug 8, 2025 By The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold F7
holding CSTL Common Stock 86K Aug 8, 2025 By DJM Grantor Retained Annuity Trust No. 5 F1, F8
holding CSTL Common Stock 18.7K Aug 8, 2025 By DJM Grantor Retained Annuity Trust No. 6 F1, F9
holding CSTL Common Stock 44.3K Aug 8, 2025 By DJM Grantor Retained Annuity Trust No. 7 F1, F10

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction CSTL Performance-Based Stock Unit Options Exercise $0 -67K -100% $0.00 0 Aug 8, 2025 Common Stock 67K Direct F11
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Reflects the transfers on July 11, 2025, of 36,907 shares of common stock from DJM Grantor Annuity Trust No. 5 and 7,416 shares of common stock from DJM Grantor Annuity Trust No. 6 to the Reporting Person's direct holdings, and the transfer on July 14, 2025, of 44,323 shares of common stock from the Reporting Person's direct holdings to DJM Grantor Annuity Trust No. 7.
F2 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.
F3 Held by Derek Maetzold 2020 Irrevocable Trust of which the Reporting Person is the trustee and his children are beneficiaries.
F4 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.
F5 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.
F6 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.
F7 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.
F8 Held by DJM Grantor Retained Annuity Trust No. 5 of which the Reporting Person is the trustee and 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 Each Performance-Based Stock Unit ("PSU") represents the right to receive one share of the Issuer's Common Stock. These PSUs represent the remaining 50% of the PSUs granted on December 23, 2022, which were all subject to time-based vesting and vested in full on the one-year anniversary of August 9, 2024.