Atara Biotherapeutics, Inc. (ATRA) — Insider Trading Activity

Atara Biotherapeutics, Inc. (ATRA) has 65 insider transactions on record, including 6 open-market purchases and 31 sales by company executives and directors. The most recent transaction was filed on 2026-09-04 by Cherry Brian N. The largest single transaction was a purchase of $ 4.74M by Ecor1 Capital, LLC.