Tobin W. Juvenal - 09 Dec 2025 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)

Role
Chief Commercial Officer
Signature
/s/ Frank Stokes, Attorney-in-fact
Issuer symbol
CSTL
Transactions as of
09 Dec 2025
Net transactions value
-$341,038
Form type
4
Filing time
11 Dec 2025, 18:44:42 UTC
Previous filing
24 Nov 2025
Next filing
15 Dec 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Juvenal Tobin W Chief Commercial Officer C/O CASTLE BIOSCIENCES, INC., 505 S FRIENDSWOOD DRIVE, SUITE 401, FRIENDSWOOD /s/ Frank Stokes, Attorney-in-fact 11 Dec 2025 0001856542

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CSTL Common Stock Options Exercise +15,961 +18% 102,786 09 Dec 2025 Direct F1, F2
transaction CSTL Common Stock Tax liability $246,368 -6,441 -6.3% $38.25 96,345 09 Dec 2025 Direct
transaction CSTL Common Stock Options Exercise +6,170 +6.4% 102,515 10 Dec 2025 Direct F1
transaction CSTL Common Stock Tax liability $94,670 -2,490 -2.4% $38.02 100,025 10 Dec 2025 Direct

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 The amount includes 2,230 shares previously held by the Tobin W and Susan M Juvenal Family Revocable Trust, which were distributed to the Reporting Person on February 5, 2025, and are now owned directly.
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.