<div id="readability-page-1"><div>Oelschlager Kristen M Chief Operating Officer of Castle Biosciences Inc [CSTL] filed a Form 4 on December 11, 2025 with the Securities and Exchange Commission disclosing the following changes in ownership:<div><table><tbody><tr><th>Date</th><th>Transaction</th><th>Shares</th><th>Price</th><th>Value</th></tr><tr><td>12/9/25-12/10/25</td><td>Exercise</td><td>22,131</td><td>$0.00</td><td>N/A</td></tr><tr><td>12/9/25-12/10/25</td><td>Surrender(1)</td><td>7,243</td><td>$38.17</td><td>$276,458</td></tr></tbody></table></div>Ending Holdings: 124,462 (27,211 - Direct, 97,251 - Indirect)<ul><li>(1)</li><li>Surrender of shares back to company to pay option exercise cost and/or resulting tax liability.</li></ul>For a free trial, or to learn more about our insider trading analysis and data services, please visit http://www.washingtonservice.com or contact us at (301) 913-5100 or send an email to info@washingtonservice.com.Founded in 1970, The Washington Service provides securities professionals with financial, economic and public policy research and data. </div></div>

CSTL

COO Kristen M Oelschlager of Castle Biosciences Inc acquired 14,888 shares, as disclosed in a Form 4 filed with the SEC. The transaction included exercising 22,131 shares and surrendering 7,243 shares to cover option exercise costs and tax liabilities. Ending holdings are 124,462 shares.

COO Oelschlager Acquires 14,888 Of Castle Biosciences Inc [CSTL]