Kim Caple - 21 May 2025 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)

Role: Director
Signature: /s/ Frank Stokes, Attorney-in-fact
Issuer symbol: CSTL
Transactions as of: 21 May 2025
Net transactions value: $0
Form type: 4
Filing time: 23 May 2025, 16:16:13 UTC
Previous filing: 16 Jul 2024
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Caple Kim	Director	C/O CASTLE BIOSCIENCES, INC., 505 S. FRIENDSWOOD DRIVE, SUITE 401, FRIENDSWOOD	/s/ Frank Stokes, Attorney-in-fact	23 May 2025	0001867184

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CSTL	Common Stock	Options Exercise		+8,673	+63%		22,454	21 May 2025	Direct	F1

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	-8,673	-100%	$0.000000	0	21 May 2025	Common Stock	8,673		Direct	F1, F2
transaction	CSTL	Restricted Stock Units	Award	$0	+13,667		$0.000000	13,667	22 May 2025	Common Stock	13,667		Direct	F1, F3

* 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 RSUs vest in full on the earlier of the (a) one-year anniversary of the date on May 23, 2025, or (b) the day immediately preceding the next Annual Meeting of Stockholders following the date of the grant.
F3	The RSUs vest in full on the earlier of the (a) one-year anniversary of the date on May 22, 2026, or (b) the day immediately preceding the next Annual Meeting of Stockholders following the date of the grant.