Kristen M. Oelschlager - 09 Dec 2025 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)

Role
Chief Operating Officer
Signature
/s/ Frank Stokes, Attorney-in-fact
Issuer symbol
CSTL
Transactions as of
09 Dec 2025
Net transactions value
-$276,458
Form type
4
Filing time
11 Dec 2025, 18:47:40 UTC
Previous filing
13 Nov 2025
Next filing
19 Dec 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Oelschlager Kristen M Chief Operating Officer C/O CASTLE BIOSCIENCES, INC., 505 S FRIENDSWOOD DRIVE, SUITE 401, FRIENDSWOOD /s/ Frank Stokes, Attorney-in-fact 11 Dec 2025 0001856565

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CSTL Common Stock Options Exercise +15,961 +130% 28,284 09 Dec 2025 Direct F1
transaction CSTL Common Stock Tax liability $179,431 -4,691 -17% $38.25 23,593 09 Dec 2025 Direct
transaction CSTL Common Stock Options Exercise +6,170 +26% 29,763 10 Dec 2025 Direct F1
transaction CSTL Common Stock Tax liability $97,027 -2,552 -8.6% $38.02 27,211 10 Dec 2025 Direct
holding CSTL Common Stock 97,251 09 Dec 2025 The Fritz Shorter Trust F2

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 Restricted Stock Units Options Exercise $0 -15,961 -50% $0.000000 15,961 09 Dec 2025 Common Stock 15,961 Direct F1, F3
transaction CSTL Restricted Stock Units Options Exercise $0 -6,170 -100% $0.000000 0 10 Dec 2025 Common Stock 6,170 Direct F1, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock.
F2 Held by the Fritz Shorter Trust of which the Reporting Person and her spouse are the trustees and beneficiaries.
F3 On December 9, 2022, the Reporting Person was granted 63,844 RSUs which vest in four equal installments beginning on December 9, 2023.
F4 On December 10, 2021, the Reporting Person was granted 24,679 RSUs which vest in four equal installments beginning on December 10, 2022.