Atara Biotherapeutics, Inc. - ATRA
Ownership (Schedule 13D / 13G) · latest 50 filings
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| Filed | Form | Reporting person | Percent | Shares | SEC |
|---|---|---|---|---|---|
| May 14, 2026 | SCHEDULE 13D/A | — | 9.99% | 2,048,243 | View |
| May 13, 2026 | SCHEDULE 13G | Adage Capital Management, L.P. | 8.56% | 700,000 | View |
| May 13, 2026 | SCHEDULE 13G | Robert Atchinson | 8.56% | 700,000 | View |
| May 13, 2026 | SCHEDULE 13G | Phillip Gross | 8.56% | 700,000 | View |
| May 11, 2026 | SCHEDULE 13D/A | — | — | — | View |
| May 08, 2026 | SCHEDULE 13G | Point72 Asset Management, L.P. | 6.2% | 526,682 | View |
| May 08, 2026 | SCHEDULE 13G | Point72 Capital Advisors, Inc. | 6.2% | 526,682 | View |
| May 08, 2026 | SCHEDULE 13G | Steven A. Cohen | 6.2% | 526,682 | View |
| May 07, 2026 | SCHEDULE 13G/A | EcoR1 Capital, LLC | 17.4% | 1,552,000 | View |
| May 07, 2026 | SCHEDULE 13G/A | Oleg Nodelman | 17.4% | 1,552,000 | View |
| May 07, 2026 | SCHEDULE 13G/A | EcoR1 Capital Fund Qualified, L.P. | 16.2% | 1,445,609 | View |
| Jan 14, 2026 | SCHEDULE 13D/A | — | 19.99% | — | View |
Percent = "% of class represented by amount beneficially owned" for this reporting person in the filed 13D/13G.
Shares = reported beneficial ownership amount for the same row (not portfolio shares from 13F).
Amendments (/A) can repeat the same holder over time, so rows should not be summed.
Extraction is best-effort from filing text and can be missing or noisy; verify exact figures via the SEC link in each row.