Atara Biotherapeutics, Inc. · NASDAQ:ATRA
Atara Biotherapeutics, Inc. shareholders
As of Jun 30, 2026, 33 institutions reported holding Atara Biotherapeutics, Inc., 44.5% of its shares. Largest: EcoR1 Capital, LLC, Adage Capital Partners Gp, L.L.C. and Point72 Asset Management, L.P. New holders, exits, insiders and big stakes, each with its filing.
| Holder | Shares | % of Atara Biotherapeutics, Inc. | Change | Filed |
|---|---|---|---|---|
| EcoR1 Capital, LLC | 1.55M | 15.5% | +1.45M | Aug 14, 2026 |
| Adage Capital Partners Gp, L.L.C. | 850K | 8.5% | +150K | Aug 14, 2026 |
| Point72 Asset Management, L.P. | 688K | 6.9% | +493K | Aug 14, 2026 |
| Redmile Group, LLC | 442K | 4.4% | no change | Aug 14, 2026 |
| Vanguard | 292K | 2.9% | +38,600 | Aug 13, 2026 |
| Mackenzie | 233K | 2.3% | −80,371 | Aug 13, 2026 |
| BlackRock | 84,455 | 0.84% | +5,433 | Aug 7, 2026 |
| Geode Capital | 75,128 | 0.75% | +8,982 | Aug 12, 2026 |
| Staley Capital Advisers Inc | 50,000 | 0.50% | no change | Aug 11, 2026 |
| Acadian Asset Management LLC | 38,845 | 0.39% | −92,065 | Aug 13, 2026 |