Atara Biotherapeutics Announces Second Quarter 2026 Financial Results and Operational Progress

THOUSAND OAKS, Calif.--(BUSINESS WIRE)--Atara Biotherapeutics, Inc. (Nasdaq: ATRA), a leader in T-cell immunotherapy, leveraging its novel allogeneic Epstein-Barr virus (EBV) T-cell platform to develop transformative therapies for patients with cancer and autoimmune diseases, today reported financial results for the second quarter 2026 and business updates. “This was an important quarter for Atara. We and our partners, Pierre Fabre Pharmaceuticals (PFP), had a productive Type A meeting with the.

Business Wire • Aug 12, 2026

Atara Biotherapeutics Announces Changes to Its Board of Directors

THOUSAND OAKS, Calif.--(BUSINESS WIRE)--Atara Biotherapeutics, Inc. (Nasdaq: ATRA), a leader in T-cell immunotherapy, leveraging its novel allogeneic Epstein-Barr virus (EBV) T-cell platform to develop transformative therapies for patients with cancer and autoimmune diseases, today announced the departure of Carol Gallagher, Pharm D from its Board of Directors. “On behalf of Atara and its Board of Directors, I want to express my gratitude to Carol for her dedication to our company and its share.

Business Wire • Jun 12, 2026

Quetzal Therapeutics Announces First Patient Dosed in Phase 3 QUATRO-APL Trial of QTX-2101 for Frontline Acute Promyelocytic Leukemia

CHICAGO, June 11, 2026 (GLOBE NEWSWIRE) -- Quetzal Therapeutics, a biopharmaceutical company focused on developing therapies for rare hematologic malignancies, today announced that the first patient has been dosed in QUATRO-APL, the company's global Phase 3 clinical trial evaluating QTX-2101, an investigational oral capsule formulation of arsenic trioxide, in combination with all-trans retinoic acid (ATRA), for the treatment of patients with newly diagnosed, low-risk Acute Promyelocytic Leukemia, or APL.

GlobeNewsWire • Jun 11, 2026

The Gross Law Firm Reminds Shareholders of a Lead Plaintiff Deadline of May 22, 2026 in Atara Biotherapeutics, Inc. Lawsuit - ATRA

NEW YORK, May 26, 2026 /PRNewswire/ -- The Gross Law Firm issues the following notice to shareholders of Atara Biotherapeutics, Inc. (NASDAQ: ATRA). Shareholders who purchased shares of ATRA during the class period listed are encouraged to contact the firm regarding possible lead plaintiff appointment.

PRNewsWire • May 26, 2026

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

NEW YORK--(BUSINESS WIRE)---- $ATRA #ATRA--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. Faruqi & Faruqi is a leading national securities law firm with offices in New York, Pennsylvania, California and Georgia. The.

Business Wire • May 22, 2026

ATRA Deadline: Rosen Law Firm Urges Atara Biotherapeutics, Inc. (NASDAQ: ATRA) Stockholders with Losses in Excess of $100K to Contact the Firm for Information About Their Rights

NEW YORK--(BUSINESS WIRE)--Rosen Law Firm, a global investor rights law firm, reminds investors about a class action lawsuit on behalf of purchasers of securities of Atara Biotherapeutics, Inc. (NASDAQ: ATRA) between May 20, 2024 and January 9, 2026. Atara describes itself as a company that “develops therapies for patients with solid tumors, hematologic cancers, and autoimmune diseases in the U.S. and the United Kingdom.”For more information, submit a form, email attorney Phillip Kim, or give us.

Business Wire • May 22, 2026

ATRA DEADLINE TODAY: ROSEN, A LEADING LAW FIRM, Encourages Atara Biotherapeutics, Inc. Investors with Losses in Excess of $100K to Secure Counsel Before Important May 22 Deadline in Securities Class Action - ATRA

NEW YORK, May 22, 2026 (GLOBE NEWSWIRE) -- 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.

GlobeNewsWire • May 22, 2026

Atara Biotherapeutics, Inc. (ATRA) Shareholders Who Lost Money Have Opportunity to Lead Securities Fraud Lawsuit

LOS ANGELES, May 22, 2026 /PRNewswire/ -- Glancy Prongay Wolke & Rotter LLP announces that investors with losses have opportunity to lead the securities fraud class action lawsuit against Atara Biotherapeutics, Inc. ("Atara" or the "Company") (NASDAQ: ATRA). IF YOU SUFFERED A LOSS ON YOUR ATARA BIOTHERAPEUTICS  INVESTMENTS, CLICK  HERE BEFORE MAY 22, 2026 (LEAD PLAINTIFF DEADLINE) TO PARTICIPATE IN THE SECURITIES FRAUD LAWSUIT What Is The Lawsuit About?

PRNewsWire • May 22, 2026

Bronstein, Gewirtz & Grossman LLC Urges Atara Biotherapeutics, Inc. Investors to Act: Class Action Filed Alleging Investor Harm

New York, New York--(Newsfile Corp. - May 22, 2026) - Bronstein, Gewirtz & Grossman, LLC, a nationally recognized investor-rights law firm, announces that a class action lawsuit has been filed against Atara Biotherapeutics, Inc. (NASDAQ: ATRA) and certain of its officers. This lawsuit seeks to recover damages against Defendants for alleged violations of the federal securities laws on behalf of all persons and entities that purchased or otherwise acquired Atara securities between May 20, 2024 and January 9, 2026, both dates inclusive (the "Class Period").

Newsfile Corp • May 22, 2026

ATRA Investors Have Opportunity to Lead Atara Biotherapeutics, Inc. Securities Fraud Lawsuit with the Schall Law Firm

LOS ANGELES, May 21, 2026 (GLOBE NEWSWIRE) -- The Schall Law Firm , a national shareholder rights litigation firm, reminds investors of a class action lawsuit against Atara Biotherapeutics, Inc. (“Atara” or “the Company”) (NASDAQ: ATRA) violations of §§10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder by the U.S. Securities and Exchange Commission. Investors who purchased the Company's securities between May 20, 2024 and January 9, 2026, inclusive (the “Class Period”), are encouraged to contact the firm before May 22, 2026.

GlobeNewsWire • May 21, 2026