Atara Biotherapeutics, Inc. - ATRA
Detailed investor-level table based on 13F positions.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| VANGUARD GROUP INC | History | No change | 225,940 | 4,087 | 0.0% | 0.0% | 1 | 0 | 0.0% | Q4 2025 | Jan 29, 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | History | New | 700,000 | 3,311 | 0.01% | — | 2 | +700,000 | New | Q1 2026 | May 15, 2026 |
| Redmile Group, LLC | History | No change | 441,701 | 2,089 | 0.14% | 0.59% | 3 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| MACKENZIE FINANCIAL CORP | History | Added to | 313,620 | 1,483 | 0.0% | 0.0% | 4 | +254,952 | 434.57% | Q1 2026 | May 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | History | New | 217,862 | 1,030 | 0.0% | — | 5 | +217,862 | New | Q1 2026 | May 15, 2026 |
| Point72 Asset Management, L.P. | History | Added to | 194,264 | 918 | 0.0% | 0.0% | 6 | +175,968 | 961.78% | Q1 2026 | May 15, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | History | Added to | 130,910 | 617 | 0.0% | 0.0% | 7 | +76,862 | 142.21% | Q1 2026 | May 13, 2026 |
| EcoR1 Capital, LLC | History | Reduced | 99,593 | 471 | 0.02% | 0.47% | 8 | -473,590 | -82.62% | Q1 2026 | May 15, 2026 |
| BlackRock, Inc. | History | Added to | 79,022 | 373 | 0.0% | 0.0% | 9 | +11,914 | 17.75% | Q1 2026 | May 13, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Added to | 66,146 | 313 | 0.0% | 0.0% | 10 | +3,765 | 6.04% | Q1 2026 | May 15, 2026 |
| UBS Group AG | History | Added to | 50,070 | 236 | 0.0% | 0.0% | 12 | +48,673 | 3484.11% | Q1 2026 | May 05, 2026 |
| STALEY CAPITAL ADVISERS INC | History | No change | 50,000 | 236 | 0.01% | 0.04% | 11 | 0 | 0.0% | Q1 2026 | Apr 29, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | New | 47,689 | 225 | 0.0% | — | 13 | +47,689 | New | Q1 2026 | May 15, 2026 |
| JANE STREET GROUP, LLC | History | Added to | 33,870 | 160 | 0.0% | 0.0% | 14 | +19,880 | 142.1% | Q1 2026 | May 12, 2026 |
| VANGUARD FIDUCIARY TRUST CO | History | New | 33,621 | 159 | 0.0% | — | 15 | +33,621 | New | Q1 2026 | May 08, 2026 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | History | No change | 32,691 | 154 | 0.0% | 0.01% | 16 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| STATE STREET CORP | History | No change | 26,453 | 125 | 0.0% | 0.0% | 17 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| FMR LLC | History | Reduced | 16,238 | 76 | 0.0% | 0.0% | 18 | -918 | -5.35% | Q1 2026 | May 15, 2026 |
| NORTHERN TRUST CORP | History | No change | 12,340 | 58 | 0.0% | 0.0% | 19 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| MORGAN STANLEY | History | Reduced | 9,169 | 43 | 0.0% | 0.0% | 20 | -6,822 | -42.66% | Q1 2026 | May 15, 2026 |
| ROYAL BANK OF CANADA | History | Added to | 4,319 | 20 | 0.0% | 0.0% | 21 | +3,469 | 408.12% | Q1 2026 | May 15, 2026 |
| SBI Securities Co., Ltd. | History | Added to | 1,574 | 7 | 0.0% | 0.0% | 22 | +170 | 12.11% | Q1 2026 | Apr 27, 2026 |
| Vanguard Global Advisers, LLC | History | New | 1,456 | 6 | 0.0% | — | 23 | +1,456 | New | Q1 2026 | May 08, 2026 |
| JONES FINANCIAL COMPANIES LLLP | History | No change | 703 | 3 | 0.0% | 0.0% | 24 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| WELLS FARGO & COMPANY/MN | History | No change | 251 | 1 | 0.0% | 0.0% | 25 | 0 | 0.0% | Q1 2026 | May 11, 2026 |
| MARSHALL WACE, LLP | History | Closed out | 0 | 0 | — | 0.0% | — | -148,632 | -100.0% | Q1 2026 | May 14, 2026 |
| GLOBEFLEX CAPITAL L P | History | Closed out | 0 | 0 | — | 0.21% | — | -77,224 | -100.0% | Q1 2026 | May 13, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -30,040 | -100.0% | Q1 2026 | May 14, 2026 |
| Cambridge Investment Research Advisors, Inc. | History | Closed out | 0 | 0 | — | 0.0% | — | -22,864 | -100.0% | Q1 2026 | Apr 30, 2026 |
| Quadrature Capital Ltd | History | Closed out | 0 | 0 | — | 0.0% | — | -20,321 | -100.0% | Q1 2026 | May 15, 2026 |
| CITADEL ADVISORS LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -15,577 | -100.0% | Q1 2026 | May 15, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | Closed out | 0 | 0 | — | 0.0% | — | -14,018 | -100.0% | Q1 2026 | May 15, 2026 |
| Walleye Capital LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -12,169 | -100.0% | Q1 2026 | May 13, 2026 |
| Connor, Clark & Lunn Investment Management Ltd. | History | Closed out | 0 | 0 | — | 0.0% | — | -10,446 | -100.0% | Q1 2026 | May 11, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Closed out | 0 | 0 | — | 0.0% | — | -10,387 | -100.0% | Q1 2026 | May 15, 2026 |
| DIMENSIONAL FUND ADVISORS LP | History | Closed out | 0 | 0 | — | 0.0% | — | -10,028 | -100.0% | Q1 2026 | May 07, 2026 |
| Tower Research Capital LLC (TRC) | History | Closed out | 0 | 0 | — | 0.0% | — | -1,737 | -100.0% | Q1 2026 | May 15, 2026 |
| Private Wealth Asset Management, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -900 | -100.0% | Q1 2026 | May 06, 2026 |
| FEDERATED HERMES, INC. | History | Closed out | 0 | 0 | — | 0.0% | — | -130 | -100.0% | Q1 2026 | May 11, 2026 |
| PlanVest Financial, Inc | History | New | 28 | 0 | — | — | — | +28 | New | Q1 2026 | May 14, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | Added to | 58 | 0 | — | — | — | +12 | 26.09% | Q1 2026 | May 12, 2026 |
| CITIGROUP INC | History | New | 1 | 0 | — | — | — | +1 | New | Q1 2026 | May 11, 2026 |
| JPMORGAN CHASE & CO | History | No change | 216 | 0 | — | 0.0% | — | 0 | 0.0% | Q1 2026 | May 13, 2026 |
| RHUMBLINE ADVISERS | History | No change | 175 | 0 | — | 0.0% | — | 0 | 0.0% | Q1 2026 | May 12, 2026 |
| OSAIC HOLDINGS, INC. | History | No change | 10 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| Rockefeller Capital Management L.P. | History | No change | 8 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Raiffeisen Bank International AG | History | No change | 200 | 0 | — | 0.0% | — | 0 | 0.0% | Q1 2026 | Apr 24, 2026 |
| Banque Transatlantique SA | History | No change | 176 | 0 | — | 0.0% | — | 0 | 0.0% | Q1 2026 | May 13, 2026 |
| KERR FINANCIAL PLANNING Corp | History | No change | 24 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | Apr 29, 2026 |