G. Bradley Cole - 05 Mar 2026 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)

Role
Director
Signature
/s/ Frank Stokes, Attorney-in-fact
Issuer symbol
CSTL
Transactions as of
05 Mar 2026
Net transactions value
-$210,727
Form type
4
Filing time
09 Mar 2026, 16:12:43 UTC
Previous filing
05 Jun 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Cole G Bradley Director C/O CASTLE BIOSCIENCES, INC., 1500 W. PARKWOOD AVE SUITE 400, FRIENDSWOOD /s/ Frank Stokes, Attorney-in-fact 09 Mar 2026 0001337798

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CSTL Common Stock Options Exercise +4,748 +22% $3.38* 26,712 05 Mar 2026 Direct
transaction CSTL Common Stock Sale $135,033 -4,748 -18% $28.44 21,964 05 Mar 2026 Direct F1
transaction CSTL Common Stock Sale $75,694 -2,655 -12% $28.51 19,309 05 Mar 2026 Direct F2

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 Stock option (right to buy) Options Exercise -4,748 -19% $0.000000* 20,000 05 Mar 2026 Common Stock 4,748 $3.38 Direct F3
* 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 $28.39 to $28.51, 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.
F2 This transaction was executed in multiple trades at prices ranging from $28.47 to $28.57, 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.
F3 The shares subject to the option are fully vested.