July 14, 2026 · Form 4 insider transaction
MAETZOLD DEREK J bought 550 shares of Castle Biosciences, Inc. at $2.39 per share, a transaction worth $1.3K. The trade was recorded as option exercise under a pre-scheduled Rule 10b5-1 plan and disclosed on an SEC Form 4, filed 2 days after the transaction.
These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 3, 2025.