| Date | Name | Symbol | Type | Security | Shares | Price | Value | Ownership | Reported |
| 03/20/2018 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 3k | $38.83 | $116.5k | | 03/19/2018 |
| 03/19/2018 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 3k | $41.99 | $126k | | 03/19/2018 |
| 02/16/2018 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 4k | $46.93 | $187.7k | | 02/15/2018 |
| 02/16/2018 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 2.5k | $48.08 | $120.2k | | 02/15/2018 |
| 02/15/2018 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Restricted Stock Units | 5.1k | $0.00 | $0 | See footnote | 02/15/2018 |
| 02/15/2018 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 6.5k | $46.77 | $304k | | 02/15/2018 |
| 02/15/2018 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Common Stock | 5.1k | $0.00 | $0 | | 02/15/2018 |
| 02/15/2018 | Atara Biotherapeutics, Inc. | ATRA | Payment of Exercise | Common Stock | 2.9k | $47.05 | $137.7k | | 02/15/2018 |
| 02/09/2018 | Atara Biotherapeutics, Inc. | ATRA | Payment of Exercise | Common Stock | 4.8k | $41.70 | $201k | | 02/09/2018 |
| 02/06/2018 | Atara Biotherapeutics, Inc. | ATRA | Grant | Common Stock | 25k | $0.00 | $0 | | 02/06/2018 |
| 02/06/2018 | Atara Biotherapeutics, Inc. | ATRA | Payment of Exercise | Common Stock | 4.3k | $35.80 | $153.2k | | 02/06/2018 |
| 02/06/2018 | Atara Biotherapeutics, Inc. | ATRA | Grant | Employee Stock Option (Right to Buy) | 50k | $35.80 | $1.8M | | 02/06/2018 |
| 01/12/2018 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 3.5k | $22.32 | $78.1k | | 01/11/2018 |
| 01/12/2018 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 30k | $25.00 | $750k | | 01/11/2018 |
| 01/12/2018 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Employee Stock Option (Right to Buy) | 30k | $11.00 | $330k | | 01/11/2018 |
| 01/11/2018 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 3.5k | $20.77 | $72.7k | | 01/11/2018 |
| 12/29/2017 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 32k | $20.00 | $640k | | 12/29/2017 |
| 11/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Restricted Stock Units | 7.7k | $0.00 | $0 | See Footnote | 11/15/2017 |
| 11/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Common Stock | 7.7k | $0.00 | $0 | | 11/15/2017 |
| 08/16/2017 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 2.1k | $14.39 | $30.2k | | 08/15/2017 |
| 08/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Restricted Stock Units | 7.7k | $0.00 | $0 | See Footnote | 08/15/2017 |
| 08/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Common Stock | 7.7k | $0.00 | $0 | | 08/15/2017 |
| 08/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 2.1k | $14.23 | $29.9k | | 08/15/2017 |
| 05/16/2017 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 2k | $15.27 | $30.5k | | 05/15/2017 |
| 05/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Restricted Stock Units | 935 | $0.00 | $0 | See Footnote | 05/15/2017 |
| 05/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Restricted Stock Units | 7.7k | $0.00 | $0 | See Footnote | 05/15/2017 |
| 05/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Common Stock | 935 | $0.00 | $0 | | 05/15/2017 |
| 05/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Common Stock | 7.7k | $0.00 | $0 | | 05/15/2017 |
| 05/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 2k | $14.95 | $29.9k | | 05/15/2017 |
| 03/23/2017 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 6.5k | $21.08 | $137k | | 03/22/2017 |
| 03/22/2017 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 7.5k | $20.27 | $152k | | 03/22/2017 |
| 03/10/2017 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 24k | $20.00 | $480k | | 03/10/2017 |
| 02/21/2017 | Atara Biotherapeutics, Inc. | ATRA | Sale | Common Stock | 9k | $15.14 | $136.3k | | 02/21/2017 |
| 02/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Common Stock | 2.8k | $0.00 | $0 | | 02/15/2017 |
| 02/15/2017 | Atara Biotherapeutics, Inc. | ATRA | Exercise | Common Stock | 7.7k | $0.00 | $0 | | 02/15/2017 |
|