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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1447362	Castle Biosciences Inc	CSTL	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1239501	J Derek Maetzold	C/O Castle Biosciences, Inc. 505 S. Friendswood Drive, Suite 401 Friendswood TX 77546	Pres. & Chief Exec. Officer	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2024-03-05	10,686	$3.72	78,604	No	4	M	Direct
Common Stock	Disposition	2024-03-05	4,131	$21.41	74,473	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Units	Acquisiton	2024-03-04	124,437	$0.00	124,437	$0.00
Common Stock	Stock option (right to buy)	Disposition	2024-03-05	10,686	$3.72	10,686	$3.72

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
124,437			No	4	A	Direct
0		2024-03-26	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	90,976	Indirect	By The Maetzold Descendants 2020 Trust
Common Stock	79,873	Indirect	By Derek Maetzold 2020 Irrevocable Trust
Common Stock	11,231	Indirect	By The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk
Common Stock	11,229	Indirect	By The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold
Common Stock	11,229	Indirect	By The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold
Common Stock	11,229	Indirect	By The Maetzold 2018 Remainder Trust FBO John Derek Maetzold
Common Stock	149,000	Indirect	By DJM Grantor Retained Annuity Trust No. 5

Footnotes

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.
Held by Derek Maetzold 2020 Irrevocable Trust of which the Reporting Person is the trustee and his children are beneficiaries.
Held by The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk of which the Reporting Person is the trustee and his child is the beneficiary.
Held by The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.
Held by The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.
Held by The Maetzold 2018 Remainder Trust FBO John Derek Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.
Held by DJM Grantor Retained Annuity Trust No. 5 of which the Reporting Person is the trustee and beneficiary.
Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock.
The RSU's vest in four equal annual installments beginning on March 04, 2025.
The shares subject to the option are fully vested.