CASTLE BIOSCIENCES INC — Director's Dealing 2021

Oct 1, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CASTLE BIOSCIENCES INC (CSTL)
CIK: 0001447362
Period of Report: 2021-09-30

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-09-30	Common Stock	S	2831	$65.12	Disposed	293187	Direct
2021-09-30	Common Stock	S	5469	$66.13	Disposed	287718	Direct
2021-09-30	Common Stock	S	1700	$66.56	Disposed	286018	Direct
2021-09-30	Common Stock	S	266	$65.09	Disposed	134528	Indirect
2021-09-30	Common Stock	S	534	$66.24	Disposed	133994	Indirect
2021-09-30	Common Stock	S	33	$66.64	Disposed	133961	Indirect
2021-09-30	Common Stock	S	267	$65.09	Disposed	157367	Indirect
2021-09-30	Common Stock	S	533	$66.24	Disposed	156834	Indirect
2021-09-30	Common Stock	S	34	$66.64	Disposed	156800	Indirect
2021-09-30	Common Stock	S	267	$65.09	Disposed	144765	Indirect
2021-09-30	Common Stock	S	533	$66.24	Disposed	144232	Indirect
2021-09-30	Common Stock	S	33	$66.64	Disposed	144199	Indirect

Footnotes

F1: These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 11, 2020.

F2: This transaction was executed in multiple trades at prices ranging from $64.51 to $65.47, 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 $65.51 to $66.50, 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: This transaction was executed in multiple trades at prices ranging from $66.51 to $66.64, 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.

F5: These transactions were made pursuant to a Rule 10b5-1 plan adopted by DJM Grantor Retained Annuity Trust No. 1, The Maetzold Descendants 2020 Trust, and the Derek Maetzold 2020 Irrevocable Trust on June 15, 2021.

F6: This transaction was executed in multiple trades at prices ranging from $64.51 to $65.43, 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.

F7: Held by DJM Grantor Retained Annuity Trust No. 1 of which the Reporting Person is the trustee and beneficiary.

F8: This transaction was executed in multiple trades at prices ranging from $65.58 to $66.57, 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.

F9: Held by The Maetzold Descendants 2020 Trust of which the Reporting Person's spouse is the trustee and the Reporting Person's spouse and their children are beneficiaries.

F10: Held by Derek Maetzold 2020 Irrevocable Trust of which the Reporting Person is the trustee and his children are beneficiaries.