Atara Biotherapeutics's top three insider shareholders as of March 23, 2026 are Innovation Ltd Panacea (TenPercentOwner, 1.32Mn shares), Capital Fund I Lp Adiumentum (Director, 1.21Mn shares), Eric Dobmeier (Director, 563.33K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Eric Dobmeier | 563,325 | 0 | 14 Nov, 2023 | |
| Innovation Ltd Panacea | 0 | 307,894 | 19 Mar, 2026 | |
| Jakob Dupont | Evp, Head Of Rd | 290,794 | 0 | 06 Mar, 2023 |
| Charlene A. Banard | Evp, Chief Technical Officer | 276,010 | 0 | 18 May, 2023 |
| Utpal Koppikar | Chief Financial Officer | 181,978 | 0 | 06 Mar, 2023 |
| Kristin Yarema | Chief Commercial Officer | 171,415 | 0 | 03 Mar, 2022 |
| Manher Joshi | Evp, Chief Medical Officer | 171,284 | 0 | 20 Nov, 2023 |
| Anhco Nguyen | President And Ceo | 143,078 | 0 | 11 Mar, 2026 |
| Beth C Seidenberg | 115,689 | 0 | 02 Jun, 2023 | |
| Joe Newell | Chief Operations Officer | 113,097 | 0 | 18 Nov, 2021 |
| Pascal Touchon | 77,955 | 0 | 12 Jun, 2025 | |
| Eric J Hyllengren | Evp, Cfo And Coo | 56,231 | 0 | 05 Mar, 2025 |
| Yanina Grant-Huerta | Chief Accounting Officer | 52,050 | 0 | 11 Mar, 2026 |
| Roy D. Baynes | 43,500 | 0 | 27 Jun, 2022 | |
| Carol Giltner Gallagher | 33,012 | 0 | 12 Jun, 2025 | |
| Ronald C Jr Renaud | 31,500 | 0 | 27 Jun, 2022 | |
| Amar Murugan | Evp, Chief Legal Officer | 26,827 | 0 | 20 Aug, 2024 |
| William K Heiden | 22,188 | 0 | 12 Jun, 2025 | |
| Jill Henrich | Evp, Chief Regulatory Officer | 18,679 | 0 | 05 Mar, 2025 |
| Matthew K Fust | 18,188 | 0 | 12 Jun, 2025 | |
| Maria Grazia Roncarolo | 17,368 | 0 | 12 Jun, 2025 | |
| Ameet Mallik | 16,928 | 0 | 12 Jun, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 17 Mar, 2026 | Innovation Ltd Panacea | Common Stock | A | 259,163 | $0.00 | 307,899 | I | M |
| 17 Mar, 2026 | Innovation Ltd Panacea | Common Stock | D | 5 | $5.23 | 307,894 | I | F |
| 17 Mar, 2026 | Innovation Ltd Panacea | Warrants | D | 259,163 | $6.61 | 0 | I | M |
| 09 Mar, 2026 | Anhco Nguyen | Common Stock | A | 81,100 | $0.00 | 143,078 | D | A |
| 09 Mar, 2026 | Yanina Grant-Huerta | Common Stock | A | 20,300 | $0.00 | 52,050 | D | A |
| 02 Mar, 2026 | Yanina Grant-Huerta | Common Stock | D | 24 | $5.08 | 33,830 | D | S |
| 02 Mar, 2026 | Anhco Nguyen | Common Stock | D | 198 | $5.08 | 64,776 | D | S |
| 02 Mar, 2026 | Yanina Grant-Huerta | Common Stock | D | 1,603 | $5.08 | 32,227 | D | S |
| 02 Mar, 2026 | Anhco Nguyen | Common Stock | D | 58 | $5.08 | 64,718 | D | S |
| 02 Mar, 2026 | Yanina Grant-Huerta | Common Stock | D | 377 | $5.08 | 31,850 | D | S |
| 02 Mar, 2026 | Anhco Nguyen | Common Stock | D | 1,298 | $5.09 | 63,420 | D | S |
| 02 Mar, 2026 | Anhco Nguyen | Common Stock | D | 1,442 | $5.09 | 61,978 | D | S |
| 02 Mar, 2026 | Yanina Grant-Huerta | Common Stock | D | 100 | $5.08 | 31,750 | D | S |
| 12 Jan, 2026 | Innovation Ltd Panacea | Common Stock | D | 80,554 | $6.07 | 1,324,446 | I | S |
| 28 Nov, 2025 | Innovation Ltd Panacea | Common Stock | A | 48,737 | $0.00 | 48,737 | I | M |
| 28 Nov, 2025 | Innovation Ltd Panacea | Common Stock | D | 1 | $14.03 | 48,736 | I | F |
| 28 Nov, 2025 | Innovation Ltd Panacea | Warrants | D | 48,737 | $6.61 | 259,163 | I | M |
| 17 Nov, 2025 | Yanina Grant-Huerta | Common Stock | D | 1,645 | $13.19 | 33,613 | D | S |
| 17 Nov, 2025 | Anhco Nguyen | Common Stock | D | 2,859 | $13.19 | 65,030 | D | S |
| 17 Nov, 2025 | Anhco Nguyen | Common Stock | D | 56 | $13.19 | 64,974 | D | S |