DEREK J. MAETZOLD - 12 Jan 2026 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)

Role
Pres. & Chief Exec. Officer, Director
Signature
/s/ Frank Stokes, Attorney-in-Fact
Issuer symbol
CSTL
Transactions as of
12 Jan 2026
Net transactions value
$0
Form type
4
Filing time
14 Jan 2026, 16:30:11 UTC
Previous filing
07 Jan 2026
Next filing
22 Jan 2026
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 14 Jan 2026 0001239501

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CSTL Common Stock Award $0 +62,219 +211% $0.000000 91,732 12 Jan 2026 Direct F1
holding CSTL Common Stock 52,923 12 Jan 2026 By The Maetzold Descendants 2020 Trust F2
holding CSTL Common Stock 44,986 12 Jan 2026 By Derek Maetzold 2020 Irrevocable Trust F3
holding CSTL Common Stock 3,618 12 Jan 2026 By The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk F4
holding CSTL Common Stock 3,615 12 Jan 2026 By The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold F5
holding CSTL Common Stock 3,615 12 Jan 2026 By The Maetzold 2018 Remainder Trust FBO John Derek Maetzold F6
holding CSTL Common Stock 3,615 12 Jan 2026 By The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold F7
holding CSTL Common Stock 85,959 12 Jan 2026 By DJM Grantor Retained Annuity Trust No. 5 F8
holding CSTL Common Stock 18,718 12 Jan 2026 By DJM Grantor Retained Annuity Trust No. 6 F9
holding CSTL Common Stock 44,323 12 Jan 2026 By DJM Grantor Retained Annuity Trust No. 7 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 Award $0 +62,219 $0.000000 62,219 12 Jan 2026 Common Stock 62,219 Direct F11
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Represents 50% of the Performance-Based Stock Units ("PSUs") granted on March 4, 2024 ("2024 PSUs") that vested based on the satisfaction of certain performance criteria as certified by the board of directors of the Issuer on January 12, 2026.
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 PSU represents the right to receive one share of the Issuer's Common Stock. These PSUs represent the remaining 50% of the 2024 PSUs which will vest subject to the achievement of certain milestones.