Atara Biotherapeutics(ATRA) - 2025 Q1 - Quarterly Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 For the transition period from to Commission file number 001-36548 ATARA BIOTHERAPEUTICS, INC. (Exact Name of Registrant as Specified in its Charter) | Delaware | 46-0920988 | | --- | --- | | (State or Other Jurisdiction of Incorporation or Organization) | (I.R.S. Employer Identification No.) | | 1280 Rancho Conejo Boulevard | | | Thousand Oaks, CA | 91320 | | (Address of Principal Executive Offices) | (Zip Code) | | Registrant's Teleph ...