X0306 4 2020-05-14 0 0001604464 Atara Biotherapeutics, Inc. ATRA 0001553335 Dupont Jakob C/O ATARA BBIOTHERAPEUTICS, INC. 611 GATEWAY BOULEVARD, SUITE 900 SOUTH SAN FRANCISCO CA 94080 0 1 0 0 EVP, Head of R&D Common Stock 2020-05-14 4 A 0 46250 0.00 A 46250 D Employee Stock Option (Right to Buy) 9.58 2020-05-14 4 A 0 277500 0.00 A 2030-05-13 Common Stock 277500 277500 D 25% of the shares subject to these restricted stock units ("RSUs") vest on May 15, 2021 and 1/16th of the total number shares subject to the RSUs vest on each of the next 12 Quarterly Vesting Dates (as defined below), subject to the reporting person's continuous service. Company Quarterly Vesting Date means March 1, May 15, August 15 and November 15 of each year. 25% of the shares subject to the option vest on May 14, 2021 and the remaining shares vest in equal monthly installments over the following 36 months, subject to the reporting person's continuous service. /s/ David Tucker, Attorney-in-Fact 2020-05-19