Form 4 Filing for Castle Biosciences Inc.

This filing details transactions by Juvenal Tobin W, Chief Commercial Officer of Castle Biosciences Inc. On September 29, 2026, 5,543 shares of Common Stock were disposed of under a Rule 10b5-1 plan at a weighted-average price of $35.498 per share. Following this transaction, 53,041 shares were held. On September 30, 2026, an additional 1,034 shares of Common Stock were disposed of under the same Rule 10b5-1 plan. The weighted-average sale price for this transaction was $34.20 per share, resulting in 52,007 shares held thereafter. The transactions were executed in multiple trades at varying prices as detailed in the footnotes.