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 |
| 2026-05-14 9:00 pm Purchase | 2026-05-12 | 13D | ATARA BIOTHERAPEUTICS INC ATRA | Redmile Group LLC | 950,994 9.900% | 199,771 (+26.59%) | Filing History |
| 2026-05-13 09:06 am Purchase | 2026-03-31 | 13G | ATARA BIOTHERAPEUTICS INC ATRA | Adage Capital Management, L.P. | 700,000 8.560% | 700,000 (New Position) | Filing History |
| 2026-05-11 6:49 pm Sale | 2026-05-07 | 13D | ATARA BIOTHERAPEUTICS INC ATRA | Panacea Innovation Limited | 1,318,894 16.100% | -313,451 (-19.20%) | Filing History |
| 2026-05-08 4:10 pm Purchase | 2026-05-07 | 13G | ATARA BIOTHERAPEUTICS INC ATRA | Point72 Asset Management, L.P. | 526,682 6.200% | 518,035 (+5990.92%) | Filing History |
| 2026-05-07 7:26 pm Purchase | 2026-05-07 | 13G | ATARA BIOTHERAPEUTICS INC ATRA | EcoR1 Capital, LLC | 1,552,000 17.400% | 836,147 (+116.80%) | Filing History |
| 2026-01-14 9:20 pm Sale | 2026-01-12 | 13D | ATARA BIOTHERAPEUTICS INC ATRA | Panacea Innovation Limited | 1,632,345 19.990% | -80,555 (-4.70%) | Filing History |
| 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 Limited | 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 Limited | 1,638,565 19.990% | 1,088,565 (+197.92%) | 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% | 21,702 (+3.74%) | Filing History |
| 2025-02-06 6:34 pm Purchase | 2025-01-30 | 13G | ATARA BIOTHERAPEUTICS INC ATRA | Panacea Innovation Limited | 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% | 90,781 (+22.54%) | Filing History |
| 2024-11-14 4:17 pm Sale | 2024-09-30 | 13G | ATARA BIOTHERAPEUTICS INC ATRA | Citadel Advisors LLC | 260,480 4.600% | -845 (-0.32%) | Filing History |
| 2024-11-12 1:29 pm Unchanged | 2024-09-30 | 13G | ATARA BIOTHERAPEUTICS INC ATRA | VANGUARD GROUP INC | 180,715 3.180% | 0 (Unchanged) | Filing History |
| 2024-11-04 11:24 am Sale | 2024-09-30 | 13G | ATARA BIOTHERAPEUTICS INC ATRA | VANGUARD GROUP INC | 180,715 3.180% | -86,727 (-32.43%) | 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 |