X0306 4 2016-02-09 0 0001604464 Atara Biotherapeutics, Inc. ATRA 0001205442 MCGRATH JOHN 701 GATEWAY BOULEVARD SUITE 200 SOUTH SAN FRANCISCO CA 94080 0 1 0 0 Chief Financial Officer Common Stock 2016-02-09 4 A 0 42857 0.00 A 79213 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. /s/ Tina Gullotta, Attorney-in-Fact for John F. McGrath, Jr. 2016-02-11