Form 4 Filing for Olson Tiffany at CASTLE BIOSCIENCES INC

Tiffany Olson, a director at CASTLE BIOSCIENCES INC (CSTL), acquired 13,667 shares of Common Stock on May 22, 2026. This acquisition was part of a transaction involving 13,667 Restricted Stock Units (RSUs). The RSUs vest in full on the earlier of the one-year anniversary of the grant date (May 22, 2026) or the day preceding the next Annual Meeting of Stockholders. Each RSU represents the right to receive one share of the Issuer's Common Stock. Following these transactions, Olson holds 39,573 shares of Common Stock.