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ATRA UPCOMING DEADLINE: Faruqi & Faruqi, LLP Reminds Atara Biotherapeutics (ATRA) Investors of Securities Class Action Deadline on May 22, 2026

Faruqi & Faruqi, LLP Securities Litigation Partner James (Josh) Wilson Encourages Investors Who Suffered Losses In Atara To Contact Him Directly To Discuss Their Options If you purchased or acquired securities in Atara between May 20, 2024 and January 9, 2026 and would like to discuss your legal rights, call Faruqi & Faruqi partner Josh Wilson directly at 877-247-4292 or 212-983-9330 (Ext. 1310). [You may also click here for additional information] NEW YORK, March 28, 2026 /PRNewswire/ -- Faruqi & Faruqi, LLP, a leading national securities law firm, is investigating potential claims against Atara Biotherapeutics, Inc. ("Atara" or the "Company") (NASDAQ: ATRA) and reminds investors of the May 22, 2026 deadline to seek the role of lead plaintiff in a federal securities class action that has been filed against the Company.

ROSEN, LEADING INVESTOR COUNSEL, Encourages Atara Biotherapeutics, Inc. Investors to Secure Counsel Before Important Deadline in Securities Class Action - ATRA

NEW YORK, March 28, 2026 (GLOBE NEWSWIRE) -- WHY: Rosen Law Firm, a global investor rights law firm, announces a class action lawsuit on behalf of purchasers of securities of Atara Biotherapeutics, Inc. (NASDAQ: ATRA) between May 20, 2024 and January 9, 2026, inclusive (the “Class Period”). A class action lawsuit has already been filed. If you wish to serve as lead plaintiff, you must move the Court no later than May 22, 2026.

ROSEN, SKILLED INVESTOR COUNSEL, Encourages Atara Biotherapeutics, Inc. Investors to Secure Counsel Before Important Deadline in Securities Class Action - ATRA

New York, New York--(Newsfile Corp. - March 27, 2026) - WHY: Rosen Law Firm, a global investor rights law firm, announces a class action lawsuit on behalf of purchasers of securities of Atara Biotherapeutics, Inc. (NASDAQ: ATRA) between May 20, 2024 and January 9, 2026, inclusive (the "Class Period"). A class action lawsuit has already been filed.

Bragar Eagel & Squire, P.C. Announces that a Class Action Lawsuit Has Been Filed Against Atara Biotherapeutics, Inc. (NASDAQ:ATRA) and Encourages Investors to Contact the Firm

Bragar Eagel & Squire, P.C.  Litigation Partner  Brandon Walker  Encourages Investors Who Suffered Losses In Atara (ATRA) To Contact Him Directly To Discuss Their Options