Atara BiotherapeuticsATRA
13F holders, Q1 2026 (March 31)At the end of Q1 2026, 32 institutions reported holding Atara Biotherapeutics Inc. (ATRA) in their 13F filings, down 9 from Q4 2025. 3 opened new positions and 14 sold out. The largest holders were Adage Capital Partners Gp, L.L.C. ($3.3M), Redmile Group, LLC ($2.1M) and Mackenzie Financial Corp. ($1.5M). 2 famous investors held it, including Steve Cohen (0.0% of Point72 Asset Management's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Atara Biotherapeutics Inc.
- CUSIP
- 046513206
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 3 | $3.5M |
| Exits | 14 | $6.8M |
All 13F filers, Q4 2025 → Q1 2026: 1,343,355 shares bought and 855,803 shares sold, net +487,552 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 32 holders
| Adage Capital Partners Gp, L.L.C. | 0.01% | New | 700,000 | $3.3M |
| Redmile Group, LLC | 0.14% | No change | 441,701 | $2.1M |
| Mackenzie Financial Corp. | 0.00% | Add +434.6% | 313,620 | $1.5M |
| Vanguard Capital Management LLC | 0.00% | — | 217,862 | $1.0M |
| Point72 Asset Management | 0.00% | Add +961.8% | 194,264 | $919K |
| Acadian Asset Management LLC | 0.00% | Add +142.2% | 130,910 | $617K |
| EcoR1 Capital, LLC | 0.02% | Reduce -82.6% | 99,593 | $471K |
| BlackRock, Inc. | 0.00% | Add +17.8% | 79,022 | $374K |
| Geode Capital Management, LLC | 0.00% | Add +6.0% | 66,146 | $313K |
| UBS Group AG | 0.00% | Add +3484.1% | 50,070 | $237K |
| Staley Capital Advisers Inc. | 0.01% | No change | 50,000 | $237K |
| Millennium Management | 0.00% | New | 47,689 | $226K |
| Jane Street Group, LLC | 0.00% | Add +142.1% | 33,870 | $160K |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 33,621 | $159K |
| Bridgeway Capital Management, LLC | 0.00% | No change | 32,691 | $155K |
| State Street Corp. | 0.00% | No change | 26,453 | $125K |
| FMR LLC | 0.00% | Reduce -5.3% | 16,238 | $77K |
| Northern Trust Corp. | 0.00% | No change | 12,340 | $58K |
| Morgan Stanley | 0.00% | Reduce -42.7% | 9,169 | $43K |
| Royal Bank of Canada | 0.00% | Add +408.1% | 4,319 | $20K |
| SBI Securities Co., Ltd. | 0.00% | Add +12.1% | 1,574 | $7K |
| Vanguard Global Advisers, LLC | 0.00% | — | 1,456 | $7K |
| Jones Financial Companies LLLP | 0.00% | No change | 703 | $3K |
| Wells Fargo & Company | 0.00% | No change | 251 | $1K |
| JPMorgan Chase & Co. | 0.00% | No change | 216 | $933 |
| Banque Transatlantique SA | 0.00% | No change | 176 | $906 |
| Rhumbline Advisers | 0.00% | No change | 175 | $827 |
| BNP Paribas Financial Markets | 0.00% | Add +26.1% | 58 | $274 |
| KERR FINANCIAL PLANNING Corp | 0.00% | No change | 24 | $116 |
| Osaic Holdings, Inc. | 0.00% | No change | 10 | $47 |
| Rockefeller Capital Management L.P. | 0.00% | No change | 8 | $38 |
| Citigroup Inc. | 0.00% | New | 1 | $5 |
"% of holder's portfolio" is ATRA's weight in each manager's 13F, not the share of Atara Biotherapeutics Inc. the manager owns.