X0306 4 2018-02-06 0 0001604464 Atara Biotherapeutics, Inc. ATRA 0001612095 Haqq Christopher 611 GATEWAY BOULEVARD SUITE 900 SOUTH SAN FRANCISCO CA 94080 0 1 0 0 EVP, R&D & Chief Scientific Of Common Stock 2018-02-06 4 A 0 17500 0.00 A 360030 D Common Stock 2018-02-06 4 F 0 4426 35.80 D 355604 D Common Stock 17312 I See footnote Common Stock 2688 I See footnote Employee Stock Option (Right to Buy) 35.80 2018-02-06 4 A 0 35000 0.00 A 2025-02-06 Common Stock 35000 35000 D These restricted stock units vest in four equal annual installments on each of the first, second, third and fourth anniversaries of the grant date, subject to the reporting person's continuous service. Shares withheld to cover tax obligation from settlement of vested restricted stock units. The shares are held by the Chris Haqq 2014 GRAT, of which the Reporting Person is trustee. The shares are held by The Havenside Trust, of which the Reporting Person is trustee. 1/48th of the shares subject to the stock option vest and become exercisable each month following February 6, 2018. /s/ David Tucker, Attorney-in-Fact for Christopher Haqq 2018-02-08