ATARA DEADLINE: ROSEN, GLOBAL INVESTOR COUNSEL, Encourages Atara Biotherapeutics, Inc. Investors with Losses in Excess of $100K to Secure Counsel Before Important Deadline in Securities Class Action - ATRA

New York, New York--(Newsfile Corp. - May 21, 2026) - WHY: Rosen Law Firm, a global investor rights law firm, reminds purchasers of securities of Atara Biotherapeutics, Inc. (NASDAQ: ATRA) between May 20, 2024 and January 9, 2026, inclusive (the "Class Period"), of the important May 22, 2026 lead plaintiff deadline. SO WHAT: If you purchased Atara securities during the Class Period you may be entitled to compensation without payment of any out of pocket fees or costs through a contingency fee arrangement.