List of insiders holdings for Atara Biotherapeutics Inc.:
- Shares directly owned by the insider.
- Shares indirectly owned by the insider.
- Total shares owned by the insider (sum of shares directly and indirectly owned).
- Total market value if available.
- Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
What is insider trading>>
- Peter Lynch
What is insider trading>>
| # | Insider Holder Name | Report Date Time | Shares Owned Directly Indirectly | Total Shares Owned | Filing |
| 1 | SEIDENBERG BETH C Director | 2023-06-02 20:06:15 | 195,189 1,877,044 | 2,072,233 | Form 4 |
| 2 | Kleiner Perkins Caufield & Byers XV LLC KPCB XV Associates LLC KPCB XV Founders Fund LLC 10% Owner | 2019-02-14 13:49:25 | 1,876,650 0 | 1,876,650 | Form 13G |
| 3 | Domain Partners VIII L.P. BLAIR JAMES C DOVEY BRIAN H TREU JESSE I SCHOEMAKER KATHLEEN K VITULLO NICOLE Halak Brian K 10% Owner | 2016-01-19 16:03:05 | 1,641,542 0 | 1,641,542 | Form 13G |
| 4 | DAG Ventures Management V LLC Cadeddu John J. Goodrich R. Thomas Pianim Nicholas K. Chung Young J. Williams Greg DAG Ventures V-QP L.P. DAG Ventures V L.P. 10% Owner | 2019-02-07 16:45:00 | 1,581,166 0 | 1,581,166 | Form 13G |
| 5 | EcoR1 Capital LLC 10% Owner | 2026-05-11 17:34:20 | 0 1,552,000 | 1,552,000 | Form 4 |
| 6 | Adiumentum Capital Fund I LP Adiumentum Capital Fund I GP LLC Ciongoli Gregory Austin See remarks 10% Owner | 2025-05-16 18:28:02 | 1,370,081 0 | 1,370,081 | Form 13D |
| 7 | Panacea Innovation Ltd Huang James 10% Owner | 2026-05-11 18:49:02 | 1,318,894 0 | 1,318,894 | Form 13D |
| 8 | Ciongoli Gregory Austin See Remarks 10% Owner | 2026-06-11 16:36:04 | 12,000 1,209,395 | 1,221,395 | Form 4 |
| 9 | Redmile Group LLC Green Jeremy Director | 2026-05-14 21:00:18 | 950,994 0 | 950,994 | Form 13D |
| 10 | MARCUS JOEL S Director | 2019-03-19 16:19:25 | 7,500 892,355 | 899,855 | Form 4 |
| 11 | Ciechanover Isaac E. Chief Executive Officer | 2019-05-31 16:16:00 | 332,243 290,687 | 622,930 | Form 4 |
| 12 | DOBMEIER ERIC Director | 2023-11-14 18:27:14 | 563,325 0 | 563,325 | Form 4 |
| 13 | Haqq Christopher EVP, R&D & Chief Scientific Of | 2019-02-19 17:08:22 | 271,943 20,000 | 291,943 | Form 4 |
| 14 | Dupont Jakob EVP, Head of R&D | 2023-03-06 18:46:39 | 290,794 0 | 290,794 | Form 4 |
| 15 | Banard Charlene A. EVP, Chief Technical Officer | 2023-05-18 20:17:21 | 276,010 0 | 276,010 | Form 4 |
| 16 | Yarema Kristin Chief Commercial Officer | 2022-03-03 19:02:35 | 257,007 0 | 257,007 | Form 4 |
| 17 | Soffer Gad EVP & Chief Strategy Officer | 2018-09-25 16:17:01 | 243,966 0 | 243,966 | Form 4 |
| 18 | Koppikar Utpal Chief Financial Officer | 2023-03-06 18:47:31 | 181,978 0 | 181,978 | Form 4 |
| 19 | Joshi Manher EVP, Chief Medical Officer | 2023-11-20 17:30:19 | 171,284 0 | 171,284 | Form 4 |
| 20 | Nguyen AnhCo President and CEO | 2026-05-20 17:24:39 | 137,837 0 | 137,837 | Form 4 |
| 21 | Newell Joe Chief Operations Officer | 2021-11-18 17:54:29 | 113,097 0 | 113,097 | Form 4 |
| 22 | Clark Mitchall G. EVP & Chief R & QA Officer | 2018-05-21 18:32:34 | 107,972 0 | 107,972 | Form 4 |
| 23 | MCGRATH JOHN EVP & Chief Financial Officer | 2018-03-20 18:30:36 | 88,762 0 | 88,762 | Form 4 |
| 24 | Berger Dietmar Global Head of R&D | 2019-05-08 16:32:32 | 85,678 0 | 85,678 | Form 4 |
| 25 | Touchon Pascal Director | 2025-06-12 20:39:15 | 77,955 0 | 77,955 | Form 4 |
| 26 | Baynes Roy D. Director | 2022-06-27 16:48:09 | 75,000 0 | 75,000 | Form 4 |
| 27 | Turner Heather D Former EVP, GC & Sec. | 2018-02-12 21:00:07 | 69,494 0 | 69,494 | Form 4 |
| 28 | Kim Mina Senior VP & General Counsel | 2019-04-10 16:33:30 | 66,389 0 | 66,389 | Form 4 |
| 29 | Renaud Ronald C JR Director | 2022-06-27 16:48:01 | 63,000 0 | 63,000 | Form 4 |
| 30 | Cherry Brian N Director | 2026-06-15 18:51:31 | 62,320 0 | 62,320 | Form 4 |
| 31 | Grant-Huerta Yanina Chief Accounting Officer | 2026-05-20 17:24:23 | 49,636 0 | 49,636 | Form 4 |
| 32 | HEIDEN WILLIAM K Director | 2026-06-11 16:37:50 | 34,188 0 | 34,188 | Form 4 |
| 33 | Gallagher Carol Giltner Director | 2025-06-12 20:39:40 | 33,012 0 | 33,012 | Form 4 |
| 34 | Porter Derrell SVP, Head of Global Commercial | 2019-03-27 17:17:20 | 31,688 0 | 31,688 | Form 4 |
| 35 | Fust Matthew K Director | 2026-06-11 16:36:58 | 30,188 0 | 30,188 | Form 4 |
| 36 | Murugan Amar EVP, Chief Legal Officer | 2024-08-20 18:27:26 | 26,827 0 | 26,827 | Form 4 |
| 37 | WEBER ECKARD Director | 2015-01-21 16:38:25 | 25,000 0 | 25,000 | Form 4 |
| 38 | Henrich Jill EVP, Chief Regulatory Officer | 2025-03-05 17:16:33 | 18,679 0 | 18,679 | Form 4 |
| 39 | Roncarolo Maria Grazia Director | 2025-06-12 20:39:02 | 17,368 0 | 17,368 | Form 4 |
| 40 | MALLIK AMEET Director | 2025-06-12 20:38:51 | 16,928 0 | 16,928 | Form 4 |
| 41 | DP VIII Associates L.P. BLAIR JAMES C DOVEY BRIAN H TREU JESSE I SCHOEMAKER KATHLEEN K VITULLO NICOLE Halak Brian K 10% Owner | 2014-10-21 10:39:26 | 15,890 0 | 15,890 | Form 4 |
| 42 | Hyllengren Eric J Former EVP, CFO & COO | 2025-04-02 19:54:05 | 2,816 0 | 2,816 | Form 4 |
| 43 | Subramanian Nachiappan Director | 2025-05-23 16:01:41 | 0 0 | 0 | Form 3 |