Real time Form 13D and 13G transaction reports:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Due to inconsistent filing format, it is highly recommended that you read the orignal filing form.
- Shares have beem 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>>
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2025-11-14 4:19 pm Purchase | 2025-11-12 | 13D | Atara Biotherapeutics, Inc. ATRA | Redmile Group, LLC | 751,223 9.900% | 46,016 (+6.53%) | Filing History |
| 2025-11-14 4:05 pm Purchase | 2025-09-30 | 13G | Atara Biotherapeutics, Inc. ATRA | EcoR1 Capital, LLC | 715,853 9.900% | 222,390 (+45.07%) | Filing History |
| 2025-08-19 8:15 pm Purchase | 2025-08-15 | 13D | Atara Biotherapeutics, Inc. ATRA | Panacea Innovation Ltd | 1,712,900 20.000% | 74,335 (+4.54%) | Filing History |
| 2025-05-23 4:05 pm Purchase | 2025-05-16 | 13D | Atara Biotherapeutics, Inc. ATRA | Redmile Group, LLC | 705,207 9.900% | 103,964 (+17.29%) | Filing History |
| 2025-05-21 6:00 pm Purchase | 2025-05-16 | 13D | Atara Biotherapeutics, Inc. ATRA | Panacea Innovation Ltd | 1,638,565 19.990% | 1,638,565 (New Position) | Filing History |
| 2025-05-16 6:28 pm Purchase | 2025-05-14 | 13D | Atara Biotherapeutics, Inc. ATRA | Adiumentum Capital Fund I LP | 1,370,081 19.990% | 235,759 (+20.78%) | Filing History |
| 2025-05-15 9:00 pm Purchase | 2025-03-31 | 13G | Atara Biotherapeutics, Inc. ATRA | Redmile Group, LLC | 601,243 9.900% | 601,243 (New Position) | Filing History |
| 2025-02-06 6:34 pm Purchase | 2025-01-30 | 13G | Atara Biotherapeutics, Inc. ATRA | Panacea Innovation Ltd | 550,000 9.500% | 550,000 (New Position) | Filing History |
| 2024-11-14 6:10 pm Purchase | 2024-09-30 | 13G | Atara Biotherapeutics, Inc. ATRA | EcoR1 Capital, LLC | 493,463 9.990% | 493,463 (New Position) | Filing History |
| 2024-11-14 4:17 pm Purchase | 2024-09-30 | 13G | Atara Biotherapeutics, Inc. ATRA | Citadel Advisors LLC | 260,480 4.600% | 260,480 (New Position) | Filing History |
| 2024-11-12 1:29 pm Unchanged | 2024-09-30 | 13G | Atara Biotherapeutics, Inc. ATRA | The Vanguard Group | 180,715 3.180% | 0 (Unchanged) | Filing History |
| 2024-11-04 11:24 am Purchase | 2024-09-30 | 13G | Atara Biotherapeutics, Inc. ATRA | The Vanguard Group | 180,715 3.180% | 180,715 (New Position) | Filing History |
| 2024-09-13 4:01 pm Purchase | 2024-09-03 | 13G | Atara Biotherapeutics, Inc. ATRA | Redmile Group, LLC | 579,541 9.900% | 167,485 (+40.65%) | Filing History |
| 2024-09-05 4:07 pm Purchase | 2024-09-03 | 13D | Atara Biotherapeutics, Inc. ATRA | Adiumentum Capital Fund I LP | 1,134,322 19.990% | 811,685 (+251.58%) | Filing History |
| 2024-07-08 4:32 pm Sale | 2024-06-30 | 13G | Atara Biotherapeutics, Inc. ATRA | BlackRock Inc. BLK | 0 0.000% | -283,489 (Position Closed) | Filing History |
| 2024-05-22 6:18 pm Purchase | 2024-05-15 | 13D | Atara Biotherapeutics, Inc. ATRA | Adiumentum Capital Fund I LP | 322,637 6.700% | 322,637 (New Position) | Filing History |
| 2024-03-18 4:13 pm Purchase | 2024-03-08 | 13G | Atara Biotherapeutics, Inc. ATRA | Citadel Advisors LLC | 261,325 6.400% | 261,325 (New Position) | Filing History |
| 2024-02-14 5:03 pm Sale | 2023-12-31 | 13G | Atara Biotherapeutics, Inc. ATRA | Maverick Capital, Ltd. | 0 0.000% | -251,641 (Position Closed) | Filing History |
| 2024-02-14 4:26 pm Purchase | 2023-12-31 | 13G | Atara Biotherapeutics, Inc. ATRA | Redmile Group, LLC | 412,056 9.900% | 18,557 (+4.72%) | Filing History |
| 2024-02-13 4:58 pm Sale | 2023-12-29 | 13G | Atara Biotherapeutics, Inc. ATRA | The Vanguard Group | 267,442 6.560% | -21,000 (-7.28%) | Filing History |