SEC Form 4 Filing for Derek Maetzold

Derek Maetzold, Pres. & Chief Exec. Officer of CASTLE BIOSCIENCES INC, reported several transactions on July 1, 2026. He acquired 6,214 shares of Common Stock at \$2.39 per share and disposed of 6,214 shares at a weighted-average price of \$24.29. Additionally, he disposed of shares held indirectly through various trusts: 1,357 shares from The Maetzold Descendants 2020 Trust, 1,153 shares from Derek Maetzold 2020 Irrevocable Trust, and 278 shares each from four different Maetzold 2018 Remainder Trusts. These transactions were made pursuant to a Rule 10b5-1 plan. Maetzold also exercised a stock option to buy 6,214 shares of Common Stock at \$2.39 per share. Following these transactions, his direct ownership of Common Stock is 27,693 shares, and indirect ownership includes holdings in DJM Grantor Retained Annuity Trusts No. 6, No. 7, and No. 8, totaling 18,718, 44,323, and 40,935 shares respectively.