Adage Capital Management, L.P. 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 |
| 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 |