CASTLE BIOSCIENCES INC — Director's Dealing 2021

May 12, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CASTLE BIOSCIENCES INC (CSTL)
CIK: 0001447362
Period of Report: 2021-05-10

Reporting Person: Olson Tiffany (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-10	Stock option (right to buy)	$54.78	A	5936	Acquired	2031-05-09	Common Stock (5936.0)	Direct
2021-05-10	Restricted Stock Units	$	A	1460	Acquired		Common Stock (1460.0)	Direct

Footnotes

F1: One-third of the shares shall vest on May 10, 2022, and the remaining shares shall vest in 24 equal monthly installments thereafter.

F2: Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock.

F3: The RSUs vest in three equal annual installments beginning on May 10, 2022.