Tobin W. Juvenal - 11 Dec 2025 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)

Role: Chief Commercial Officer
Signature: /s/ Frank Stokes, Attorney-in-fact
Issuer symbol: CSTL
Transactions as of: 11 Dec 2025
Net transactions value: -$494,736
Form type: 4
Filing time: 15 Dec 2025, 16:09:39 UTC
Previous filing: 11 Dec 2025
Next filing: 14 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Juvenal Tobin W	Chief Commercial Officer	C/O CASTLE BIOSCIENCES, INC., 505 S FRIENDSWOOD DRIVE, SUITE 401, FRIENDSWOOD	/s/ Frank Stokes, Attorney-in-fact	15 Dec 2025	0001856542

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CSTL	Common Stock	Sale	$494,736	-13,200	-13%	$37.48	86,825	11 Dec 2025	Direct	F1

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

Explanation of Responses:

Id	Content
F1	This transaction was executed in multiple trades at prices ranging from $37.31 to $37.72, 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.

Content

This transaction was executed in multiple trades at prices ranging from $37.31 to $37.72, 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.