Trade Summary

4 days ago, MAETZOLD DEREK J, serving as Pres. & Chief Exec. Officer at CASTLE BIOSCIENCES INC (CSTL), sold 28,646 shares at $30.28 per share, for a total transaction value of $867,451.29. Following this transaction, MAETZOLD DEREK J now holds 27,009 shares of CSTL.

This sale represents a 51.47% 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 Friday, July 31, 2026 and publicly disclosed via SEC Form 4 filing on Tuesday, August 4, 2026 at 4:35 PM ET, 4 days 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.