Form 4 Filing for Kristen M. Oelschlager

Kristen M. Oelschlager, Chief Operating Officer of CASTLE BIOSCIENCES INC, reported several transactions on October 1, 2026. Oelschlager acquired 4,153 shares of Common Stock under a Rule 10b5-1 plan at a price of $3.38 per share, increasing her post-transaction shares to 17,509. She also disposed of 2,807 shares at a weighted-average price of $35.75 and 1,346 shares at a weighted-average price of $36.38. Additionally, Oelschlager exercised a stock option to acquire 4,153 shares of Common Stock. These transactions were made pursuant to a Rule 10b5-1 plan. The filing also notes that 72,649 shares are held indirectly through The Fritz Shorter Trust, of which Oelschlager and her spouse are trustees and beneficiaries. The shares subject to the option are fully vested.