Atara Biotherapeutics, Inc.
ATRA
16 insider filings · Latest: Sep 4, 2026
Common Stock Transactions
| Txn Date | Accepted | Insider | Type | Shares | Avg Price | Value | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|---|
| Sep 4, 2026 | Sep 4 10:20 PM | Brian N CherryDirector | Purchase | 104,166 | $9.60 | $1000.0K | 166,486(D) | View → |
| Aug 17, 2026 | Aug 26 11:47 PM | Nguyen AnhCo | Proposed Sale | 5,062 | $8.36 | $42.3K | — | View → |
| Aug 17, 2026 | Aug 26 11:45 PM | Anhco NguyenDirector, President and CEO | Sale | 5,062 | $8.08 | $40.9K | 132,775(D) | View → |
| May 18, 2026 | May 20 9:24 PM | Anhco NguyenDirector, President and CEO | Sale | 5,241 | $9.13 | $47.8K | 137,837(D) | View → |
| May 18, 2026 | May 20 9:24 PM | Yanina Grant-HuertaChief Accounting Officer | Sale | 2,414 | $9.13 | $22.0K | 49,636(D) | View → |
| May 18, 2026 | May 18 8:45 PM | Nguyen AnhCo | Proposed Sale | 5,981 | $10.48 | $62.7K | — | View → |
| May 18, 2026 | May 18 8:44 PM | Grant-Huerta Yanina | Proposed Sale | 2,754 | $10.48 | $28.9K | — | View → |
| May 7, 2026 | May 11 10:45 PM | Panacea Innovation Ltd10% Owner | Sale | 313,446 | $10.10 | $3.2M | 1,011,000(I) | View → |
| May 7, 2026 | May 11 9:34 PM | EcoR1 Capital, LLC10% Owner | Purchase | 507,407 | $9.35 | $4.7M | 1,552,000(I) | View → |
| May 7, 2026 | May 8 12:30 AM | Panacea Innovation Ltd | Proposed Sale | 313,446 | $10.10 | $3.2M | — | View → |
| Mar 2, 2026 | Mar 4 9:28 PM | Yanina Grant-HuertaChief Accounting Officer | Sale | 2,104 | $5.08 | $10.7K | 31,750(D) | View → |
| Mar 2, 2026 | Mar 4 9:28 PM | Anhco NguyenDirector, President and CEO | Sale | 2,996 | $5.09 | $15.2K | 61,978(D) | View → |
| Mar 2, 2026 | Mar 2 11:25 PM | Nguyen AnhCo | Proposed Sale | 3,355 | $5.42 | $18.2K | — | View → |
| Mar 2, 2026 | Mar 2 11:24 PM | Grant-Huerta Yanina | Proposed Sale | 2,355 | $5.42 | $12.8K | — | View → |
| Jan 12, 2026 | Jan 13 2:26 AM | Panacea Innovation Ltd | Proposed Sale | 80,554 | $5.88 | $473.7K | — | View → |
| Nov 17, 2025 | Nov 17 10:52 PM | Nguyen AnhCo | Proposed Sale | 3,346 | $13.76 | $46.0K | — | View → |
| Nov 17, 2025 | Nov 17 10:50 PM | Grant-Huerta Yanina | Proposed Sale | 2,069 | $13.76 | $28.5K | — | View → |
| Aug 18, 2025 | Aug 18 8:52 PM | Nguyen AnhCo | Proposed Sale | 3,346 | $12.29 | $41.1K | — | View → |
| Aug 18, 2025 | Aug 18 8:47 PM | Grant-Huerta Yanina | Proposed Sale | 2,048 | $12.29 | $25.2K | — | View → |
| May 16, 2025 | May 16 11:32 PM | Nguyen AnhCo | Proposed Sale | 3,471 | $7.61 | $26.4K | — | View → |
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Stock Options & Derivatives
| Txn Date | Accepted | Insider | Type | Shares | Exercise Price | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|
| Jul 22, 2026 | Jul 25 1:00 AM | Redmile Group, LLCDirector | Option Exercise | 195,211 | — | 0(I) | View → |
| Mar 17, 2026 | Mar 19 8:30 PM | Panacea Innovation Ltd10% Owner | Option Exercise | 259,163 | $0.0001 | 0(I) | View → |