UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 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 jurisdic ...

Atara Biotherapeutics, Inc. (NASDAQ:ATRA) Q3 2022 Results Conference Call November 8, 2022 4:30 PM ET Company Participants Eric Hyllengren - Vice President of Investor Relations and Finance Dr. Pascal Touchon - President and Chief Executive Officer Dr. Jakob Dupont - Executive Vice President and Global Head of Research and Development Utpal Koppikar - Chief Financial Officer Dr. AJ Joshi - Chief Medical Officer Conference Call Participants Salim Syed - Mizuho Group John Newman - Canaccord Phil Nadeau - Cowe ...

Atara Biotherapeutics, Inc. (NASDAQ:ATRA) Q2 2022 Earnings Conference Call August 8, 2022 4:30 PM ET Company Participants Eric Hyllengren - VP of IR and Finance Pascal Touchon - President and CEO Utpal Koppikar - CFO Jakob Dupont - EVP and Global Head of Research and Development AJ Joshi - Chief Medical Officer Conference Call Participants Salim Syed - Mizuho Tessa Romero - JPMorgan John Newman - Canaccord Ernesto Rodriguez Dumont - Cowen & Co. Michael DiFiore - Evercore ISI Tommie Reerink - Goldman Sachs C ...

Atara Biotherapeutics, Inc. (NASDAQ:ATRA) Q1 2022 Results Conference Call May 5, 2022 4:30 PM ET Company Participants Eric Hyllengren - VP of IR and Finance Pascal Touchon - President and CEO Utpal Koppikar - Chief Financial Officer Jakob Dupont - EVP and Global Head of Research and Development AJ Joshi - Chief Medical Officer Kristin Yarema - Chief Commercial Officer Conference Call Participants Salim Syed - Mizuho Tessa Romero - JPMorgan John Newman - Canaccord Marc Frahm - Cowen and Company Ben Burnett - ...