EcoR1 Capital, LLC 13D and 13G filings for Atara Biotherapeutics, Inc.:
- 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.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 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 |
| 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 |