Form 4 Filing for MAETZOLD DEREK J

On October 5, 2026, MAETZOLD DEREK J, President & Chief Executive Officer of CASTLE BIOSCIENCES INC, reported several transactions of the company's common stock. These transactions were conducted under a Rule 10b5-1 plan. Specifically, 8,165 shares were acquired directly at $2.39 per share. Additionally, 8,580 shares were disposed of directly at a weighted-average price of $35.566, with transactions occurring between $35.310 and $35.965. Indirectly, 3,198 shares were disposed of from The Maetzold Descendants 2020 Trust and 2,718 shares from the Derek Maetzold 2020 Irrevocable Trust, both at a weighted-average price of $35.566. Following these transactions, MAETZOLD DEREK J directly holds 29,644 shares and indirectly holds shares through various trusts, including The Maetzold 2018 Remainder Trust and DJM Grantor Retained Annuity Trusts.