CASTLE BIOSCIENCES INC (CSTL) Institutional Ownership and Insiders Activity

CASTLE BIOSCIENCES INC (CSTL) is widely held by institutional investors, with 171 firms reporting positions valued at approximately $650.87M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Blackrock, Inc. is the largest disclosed holder, reporting approximately $78.51M in CSTL holdings in its latest filing.

Recent insider activity includes 50 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.