Frank Stokes - Aug 9, 2024 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)

Role: Chief Financial Officer
Signature: /s/ Frank Stokes, Attorney-in-fact
Stock symbol: CSTL
Transactions as of: Aug 9, 2024
Transactions value $: -$75,714
Form type: 4
Date filed: 8/13/2024, 06:14 PM
Previous filing: Aug 13, 2024

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CSTL	Common Stock	Award	$0	+9.75K	+31.62%	$0.00	40.6K	Aug 9, 2024	Direct	F1
transaction	CSTL	Common Stock	Tax liability	-$75.7K	-2.82K	-6.96%	$26.83	37.7K	Aug 9, 2024	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	Performance-Based Stock Unit	Award	$0	+9.74K		$0.00	9.74K	Aug 9, 2024	Common Stock	9.74K		Direct	F2

* 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 December 23, 2022 ("2022 PSUs") that vested based on the satisfaction of certain performance criteria as certified by the board of directors of the Issuer on August 9, 2024 (the "Initial Vesting Date").
F2	Each PSU represents the right to receive one share of the Issuer's Common Stock. These PSUs represent the remaining 50% of the 2022 PSUs which are all subject to time-based vesting and will vest in full on the one-year anniversary of the Initial Vesting Date.