Form 4 Filing for Rodney Cotton

Rodney Cotton, a director at CASTLE BIOSCIENCES INC, acquired 13,667 shares of Common Stock on May 22, 2026. This transaction was part of the vesting of 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 before the next Annual Meeting of Stockholders. Each RSU represents the right to receive one share of Common Stock. Following this transaction, Cotton holds 32,998 shares of Common Stock directly. The reported value of the acquired shares is $0, as indicated by the transaction price per share.