Bernhard E. Spiess - Jun 8, 2021 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)

Role: Chief Business Officer
Signature: /s/ Greg Acosta, Attorney-in-fact
Stock symbol: CSTL
Transactions as of: Jun 8, 2021
Transactions value $: -$611,971
Form type: 4
Date filed: 6/10/2021, 05:06 PM
Next filing: Sep 7, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CSTL	Common Stock	Options Exercise	$17.3K	+8.99K	+66.28%	$1.92^*	22.6K	Jun 8, 2021	Direct	F1, F2
transaction	CSTL	Common Stock	Sale	-$629K	-8.99K	-39.86%	$70.00	13.6K	Jun 8, 2021	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	Stock option (right to buy)	Options Exercise	$0	-8.99K	-37.66%	$0.00	14.9K	Jun 8, 2021	Common Stock	8.99K	$1.92	Direct	F1, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on May 24, 2021.
F2	Includes 1,815 shares acquired on February 26, 2021 under the Issuer's employee stock purchase plan.
F3	25% of the 169,592 shares originally subject to the option vested on May 2, 2017, and the remaining shares vested in 36 equal monthly installments thereafter.