Insider holders · CIK 0001604464
Atara Biotherapeutics, Inc. · ATRA
Every insider with a reported Table I holding at this company, ranked by their last-reported share count. A balance is only as fresh as its filing — the report date sits next to every row on purpose. ← Back to activity
| Insider | Direct shares | Indirect shares | Total reported | Last report (ET) | From |
|---|---|---|---|---|---|
| Gregory Austin CiongoliDirector | 12,000 | 1,209,395 | 1,221,395 | Jun 11, 2026 · 4:36 pm EDT | Form 4 |
| Joel S MarcusDirector | 7,500 | 908,355 | 915,855 | Mar 1, 2019 · 4:09 pm EST | Form 4 |
| Isaac E. CiechanoverChief Executive Officer | 332,243 | 335,537 | 667,780 | Mar 1, 2019 · 4:10 pm EST | Form 4 |
| Jeremy GreenDirector | — | 636,852 | 636,852 | Jul 24, 2026 · 9:00 pm EDT | Form 4 |
| Redmile Group, LLCDirector | — | 636,852 | 636,852 | Jul 24, 2026 · 9:00 pm EDT | Form 4 |
| Christopher HaqqEVP, R&D & Chief Scientific Of | 271,943 | 2,688 | 274,631 | Feb 19, 2019 · 5:08 pm EST | Form 4 |
| Gad SofferEVP & Chief Strategy Officer | 243,966 | — | 243,966 | Sep 25, 2018 · 4:17 pm EDT | Form 4 |
| Brian N CherryDirector | 166,486 | — | 166,486 | Sep 4, 2026 · 6:20 pm EDT | Form 4 |
| Carol Giltner GallagherDirector | 88,818 | 62,656 | 151,474 | Nov 7, 2018 · 7:44 pm EST | Form 4 |
| AnhCo NguyenPresident and CEO | 132,775 | — | 132,775 | Aug 26, 2026 · 7:45 pm EDT | Form 4 |
| Mitchall G. ClarkEVP & Chief R & QA Officer | 107,972 | — | 107,972 | May 21, 2018 · 6:32 pm EDT | Form 4 |
| John McGrathEVP & Chief Financial Officer | 88,762 | — | 88,762 | Mar 20, 2018 · 6:30 pm EDT | Form 4 |
| Dietmar BergerGlobal Head of R&D | 75,000 | — | 75,000 | Feb 8, 2019 · 4:26 pm EST | Form 4 |
| Heather D TurnerFormer EVP, GC & Sec. | 69,494 | — | 69,494 | Feb 12, 2018 · 9:00 pm EST | Form 4 |
| Utpal KoppikarChief Financial Officer | 64,063 | — | 64,063 | Feb 8, 2019 · 4:44 pm EST | Form 4 |
| Kleiner Perkins Caufield & Byers XV, LLC10% Owner | — | 63,122 | 63,122 | May 21, 2015 · 6:47 pm EDT | Form 4 |
| KPCB XV Founders Fund, LLC10% Owner | — | 63,122 | 63,122 | May 21, 2015 · 6:47 pm EDT | Form 4 |
| KPCB XV Associates, LLC10% Owner | — | 63,122 | 63,122 | May 21, 2015 · 6:47 pm EDT | Form 4 |
| Mina KimSenior VP & General Counsel | 60,063 | — | 60,063 | Feb 8, 2019 · 4:25 pm EST | Form 4 |
| Joe NewellChief Tech. Operations Officer | 47,146 | — | 47,146 | Mar 5, 2019 · 6:58 pm EST | Form 4 |
| William K HeidenDirector | 34,188 | — | 34,188 | Jun 11, 2026 · 4:37 pm EDT | Form 4 |
| Matthew K FustDirector | 30,188 | — | 30,188 | Jun 11, 2026 · 4:36 pm EDT | Form 4 |
| Derrell PorterSVP, Head of Global Commercial | 21,688 | — | 21,688 | Feb 19, 2019 · 5:05 pm EST | Form 4 |
| Beth C SeidenbergDirector | 15,189 | 197 | 15,386 | Jun 18, 2018 · 7:21 pm EDT | Form 4 |
| Eric DobmeierDirector | 14,000 | — | 14,000 | Jun 18, 2018 · 4:23 pm EDT | Form 4 |
Balances come from each insider’s most recent filing that reports a Table I holding; an insider who left the company years ago still appears with their last-known figure and its date. Indirect totals collapse multiple vehicles (trusts, LLCs) into one number — open the filing for the breakdown. Shares as filed, not split-adjusted.