X0306 4 2017-02-09 0 0001604464 Atara Biotherapeutics, Inc. ATRA 0001403571 Turner Heather D C/O ATARA BIOTHERAPEUTICS, INC. 611 GATEWAY BOULEVARD, SUITE 900 SOUTH SAN FRANCISCO CA 94080 0 1 0 0 EVP, General Counsel & Sec. Common Stock 2017-02-09 4 S 0 11582 15.70 D 86775 D Common Stock 2017-02-09 4 S 0 633 16.16 D 86142 D Transaction pursuant to Rule 10b5-1 Plan adopted September 23, 2016. The price in Column 4 is a weighted average sale price. The prices actually received ranged from $15.15 to $16.10. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range. The price in Column 4 is a weighted average sale price. The prices actually received ranged from $16.15 to $16.20. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range. /s/ Tina Gullotta, Attorney-in-Fact for Heather D. Turner 2017-02-10