Tobin W. Juvenal - 03 Mar 2026 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
03 Mar 2026
Net transactions value
$0
Form type
4
Filing time
05 Mar 2026, 17:18:41 UTC
Previous 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., 1500 W. PARKWOOD AVE SUITE 400, FRIENDSWOOD /s/ Frank Stokes, Attorney-in-fact 05 Mar 2026 0001856542

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CSTL Common Stock Tax liability -3,716 -3.9% $27.57* 92,316 03 Mar 2026 Direct F1
transaction CSTL Common Stock Options Exercise +25,771 +28% 118,087 04 Mar 2026 Direct F2
transaction CSTL Common Stock Tax liability -10,399 -8.8% $28.17* 107,688 04 Mar 2026 Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction CSTL Restricted Stock Units Award +48,367 $0.000000* 48,367 03 Mar 2026 Common Stock 48,367 Direct F2, F3
transaction CSTL Restricted Stock Units Options Exercise -13,811 -33% $0.000000* 27,621 04 Mar 2026 Common Stock 13,811 Direct F2, F4
transaction CSTL Restricted Stock Units Options Exercise -11,960 -25% $0.000000* 35,878 04 Mar 2026 Common Stock 11,960 Direct F2, F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the delivery of vested performance stock units reported on January 12, 2026.
F2 Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock.
F3 The RSU's vest in four equal annual installments beginning on March 03, 2027.
F4 On March 4, 2024, the Reporting Person was granted 55,243 RSUs which vest in four equal installments beginning on March 4, 2025.
F5 On March 4, 2025, the Reporting Person was granted 47,838 RSUs which vest in four equal installments beginning on March 4, 2026.