SEC Form 4 Filing for MAETZOLD DEREK J

Derek J. Maetzold, President & CEO of CASTLE BIOSCIENCES INC (CSTL), reported several non-derivative transactions on September 11, 2026. He acquired 8,584 shares of Common Stock at $2.39 per share and disposed of 8,361 shares at a weighted-average price of $32.00, and an additional 223 shares at $32.78. Further disposals include 3,124 shares by The Maetzold Descendants 2020 Trust and 2,656 shares by Derek Maetzold 2020 Irrevocable Trust, both at a weighted-average price of $32.00. Additionally, 83 shares held by The Maetzold Descendants 2020 Trust and 71 shares held by Derek Maetzold 2020 Irrevocable Trust were disposed of at $32.78 per share. Maetzold also exercised a stock option for 8,584 shares of Common Stock at an exercise price of $2.39 per share, resulting in a direct ownership of 16,745 shares post-transaction. The transactions were executed under a Rule 10b5-1 plan. Significant post-transaction holdings remain indirectly owned through various trusts, including The Maetzold 2018 Remainder Trusts and DJM Grantor Retained Annuity Trusts.