Over the 90-day window ending February 19, 2026, Atara Biotherapeutics's three dominant insider ownership positions are held by TenPercentOwner Innovation Ltd Panacea (1.32Mn shares), Director Capital Fund I Lp Adiumentum (1.21Mn shares), Director Pascal Touchon (77.95K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Innovation Ltd Panacea | 1,324,446 | 14 Jan, 2026 | |
| Capital Fund I Lp Adiumentum | 1,209,395 | 16 May, 2025 | |
| Eric Dobmeier | 22,533 | 14 Nov, 2023 | |
| Jakob Dupont | Evp And Head Of R&D | 11,632 | 06 Mar, 2023 |
| Charlene A. Banard | Evp And Chief Technical Officer | 11,040 | 18 May, 2023 |
| Utpal Koppikar | Chief Financial Officer | 7,279 | 06 Mar, 2023 |
| Kristin Yarema | Chief Commercial Officer | 6,857 | 03 Mar, 2022 |
| Manher Joshi | Evp And Chief Medical Officer | 6,851 | 20 Nov, 2023 |
| Beth C Seidenberg | 4,628 | 02 Jun, 2023 | |
| Joe Newell | Chief Operations Officer | 4,524 | 18 Nov, 2021 |
| Pascal Touchon | 77,955 | 12 Jun, 2025 | |
| Anhco Nguyen | President And Ceo | 64,974 | 19 Nov, 2025 |
| Eric J Hyllengren | Evp And Cfo And Coo | 56,231 | 05 Mar, 2025 |
| Roy D. Baynes | 1,740 | 27 Jun, 2022 | |
| Yanina Grant-Huerta | Chief Accounting Officer | 33,454 | 19 Nov, 2025 |
| Carol Giltner Gallagher | 33,012 | 12 Jun, 2025 | |
| Ronald C Jr Renaud | 1,260 | 27 Jun, 2022 | |
| Amar Murugan | Evp And Chief Legal Officer | 26,827 | 20 Aug, 2024 |
| William K Heiden | 22,188 | 12 Jun, 2025 | |
| Jill Henrich | Evp And Chief Regulatory Officer | 18,679 | 05 Mar, 2025 |
| Matthew K Fust | 18,188 | 12 Jun, 2025 | |
| Maria Grazia Roncarolo | 17,368 | 12 Jun, 2025 | |
| Ameet Mallik | 16,928 | 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 |
|---|---|---|---|---|---|---|---|---|
| 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 |
| 17 Nov, 2025 | Anhco Nguyen | Common Stock | D | 56 | $13.19 | 64,974 | D | S |
| 17 Nov, 2025 | Anhco Nguyen | Common Stock | D | 2,859 | $13.19 | 65,030 | D | S |
| 17 Nov, 2025 | Anhco Nguyen | - | - | 64,974 | D | |||
| 17 Nov, 2025 | Anhco Nguyen | - | - | 65,030 | D | |||
| 17 Nov, 2025 | Yanina Grant-Huerta | Common Stock | D | 1,645 | $13.19 | 33,613 | D | S |
| 17 Nov, 2025 | Yanina Grant-Huerta | Common Stock | D | 74 | $13.19 | 33,454 | D | S |
| 17 Nov, 2025 | Yanina Grant-Huerta | Common Stock | D | 85 | $13.19 | 33,528 | D | S |
| 17 Nov, 2025 | Yanina Grant-Huerta | - | - | 33,454 | D | |||
| 18 Aug, 2025 | Anhco Nguyen | Common Stock | D | 1,620 | $11.62 | 67,889 | D | S |
| 18 Aug, 2025 | Anhco Nguyen | Common Stock | D | 57 | $11.61 | 70,790 | D | S |
| 18 Aug, 2025 | Anhco Nguyen | Common Stock | D | 1,281 | $11.62 | 69,509 | D | S |
| 18 Aug, 2025 | Yanina Grant-Huerta | Common Stock | D | 86 | $11.61 | 36,926 | D | S |
| 18 Aug, 2025 | Yanina Grant-Huerta | Common Stock | D | 1,668 | $11.61 | 35,258 | D | S |
| 18 Aug, 2025 | Yanina Grant-Huerta | Common Stock | D | 55 | $11.61 | 37,012 | D | S |
| 15 Aug, 2025 | Innovation Ltd Panacea | Common Stock | A | 55,000 | $12.19 | 1,405,000 | I | P |
| 17 Jul, 2025 | Innovation Ltd Panacea | Common Stock | A | 19,335 | $9.64 | 1,350,000 | I | P |
| 10 Jun, 2025 | William K Heiden | Common Stock | A | 7,828 | $0.00 | 22,188 | D | A |