CASTLE BIOSCIENCES INC — Director's Dealing 2020

May 26, 2020

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CASTLE BIOSCIENCES INC (CSTL)
CIK: 0001447362
Period of Report: 2020-05-22

Reporting Person: MAETZOLD DEREK J (Director, Pres. & Chief Exec. Officer, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-05-22	Common Stock	S	3989	$36.83	Disposed	1628359	Direct
2020-05-22	Common Stock	S	1011	$37.53	Disposed	1627348	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	159329	Indirect

Footnotes

F1: The transactions on this Form 4 were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on March 18, 2020.

F2: This transaction was executed in multiple trades at prices ranging from $36.29 to $37.29, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F3: This transaction was executed in multiple trades at prices ranging from $37.31 to $37.98, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F4: Held by the DJM Grantor Retained Annuity Trust No. 1, or the Maetzold Trust. The Reporting Person is a trustee of the Maetzold Trust.