Trade Summary

6 days ago, MAETZOLD DEREK J, serving as Pres. & Chief Exec. Officer at CASTLE BIOSCIENCES INC (CSTL), sold 4,172 shares at $20.15 per share, for a total transaction value of $84,065.85. Following this transaction, MAETZOLD DEREK J now holds 1,946 shares of CSTL.

This sale represents a 68.19% decrease in MAETZOLD DEREK J's stake in the company. This is considered a high-conviction trade given the significant change in ownership.

The trade was executed on Thursday, May 21, 2026 and publicly disclosed via SEC Form 4 filing on Friday, May 22, 2026 at 4:12 PM ET, 1 day after the trade was made.

CASTLE BIOSCIENCES INC operates in the HEALTHCARE sector, specifically within the DIAGNOSTICS & RESEARCH industry. Insider selling activity in this sector can provide valuable signals about industry trends and company-specific developments.