Atara Biotherapeutics, Inc.

2024 EQUITY INCENTIVE PLAN

EVERGREEN PROVISION

To include the following section into the 2024 Equity Incentive Plan:

Section 3(a)(ii) –

“The Share Reserve will automatically increase on January 1 st of each year, for a period of not more than ten years, commencing on January 1, 2025 and ending on (and including) January 1, 2034, in an amount equal to 4% of the total number of shares of Company capital stock outstanding on December 31 st of the preceding calendar year. Notwithstanding the foregoing, the Board may act prior to January 1 st of a given year to provide that there will be no January 1 st increase in Share Reserve for such year or that the increase in the Share Reserve for such year will be a lesser number of shares of Common Stock than would otherwise occur pursuant to the preceding sentence.”