ATRA Shareholder Alert: May 22, 2026 Lead Plaintiff Deadline in Atara Biotherapeutics, Inc. Securities Class Action Lawsuit -- The Gross Law Firm

ALLEGATIONS: The complaint alleges that during the class period, Defendants issued materially false and/or misleading statements and/or failed to disclose that: (i) certain manufacturing issues, as well as deficiencies inherent in the ALLELE study, made it unlikely that the FDA would approve the tabelecleucel BLA; (ii) accordingly, tabelecleucel's regulatory prospects were overstated; (iii) the aforementioned manufacturing issues also subjected Atara to a heightened risk of regulatory scrutiny, as well as jeopardized its ongoing clinical trials; (iv) all the foregoing was likely to have a significant negative impact on Atara's business and financial condition; and (v) as a result, defendants' public statements were materially false and/or misleading at all relevant times.

DEADLINE: May 22, 2026 Shareholders should not delay in registering for this class action. Register your information here: https://securitiesclasslaw.com/securities/atara-biotherapeutics-inc-loss-submission-form/?id=185288&from=4

NEXT STEPS FOR SHAREHOLDERS: Once you register as a shareholder who purchased shares of ATRA during the timeframe listed above, you will be enrolled in a portfolio monitoring software to provide you with status updates throughout the lifecycle of the case. The deadline to seek to be a lead plaintiff is May 22, 2026. There is no cost or obligation to you to participate in this case.

WHY GROSS LAW FIRM? The Gross Law Firm is a nationally recognized class action law firm, and our mission is to protect the rights of all investors who have suffered as a result of deceit, fraud, and illegal business practices. The Gross Law Firm is committed to ensuring that companies adhere to responsible business practices and engage in good corporate citizenship. The firm seeks recovery on behalf of investors who incurred losses when false and/or misleading statements or the omission of material information by a company lead to artificial inflation of the company's stock. Attorney advertising. Prior results do not guarantee similar outcomes.

CONTACT:
The Gross Law Firm
15 West 38th Street, 12th floor
New York, NY, 10018
Email: dg@securitiesclasslaw.com
Phone: (646) 453-8903

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SOURCE The Gross Law Firm