Management Change/Compensation Form 8 K

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On October 14, 2024, the Board of Directors (the "Board") of Atara Biotherapeutics, Inc. (the "Company") appointed Eric Hyllengren to serve as the Company's Chief Operating Officer, in addition to his role as the Company's Chief Financial Officer.

Mr. Hyllengren, age 49, has served as the Company's Chief Financial Officer since April 2023. Mr. Hyllengren joined the Company in August 2018 as Vice President, Finance and assumed the role of Head of Investor Relations in April 2020. Prior to joining the Company, he spent 15 years at Amgen Inc. in several finance roles with increasing responsibilities, including corporate finance and investor relations. Mr. Hyllengren holds a B.B.A. in finance and Russian from the University of Notre Dame and an M.B.A. in finance from the Kellogg School of Management at Northwestern University.

In connection with Mr. Hyllengren's promotion to Chief Operating Officer, his base salary was increased to $520,000 per year.

There are no arrangements or understandings between Mr. Hyllengren any other persons pursuant to which Mr. Hyllengren was promoted to Chief Operating Officer. There are no family relationships between Mr. Hyllengren and any director, executive officer or any other person nominated or chosen by the Company to become a director or executive officer. There are no related person transactions (within the meaning of Item 404(a) of Regulation S-Kpromulgated by the Securities and Exchange Commission) between Mr. Hyllengren and the Company.