Atara Biotherapeutics, Inc. - ATRA
Detailed investor-level table based on 13F positions.
Early Q1 2026 data: only 4 institutional holders reported so far. The full shareholder list will grow as more funds file with the SEC.
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| EcoR1 Capital, LLC | History | No change | 573,183 | 10,368 | 0.47% | 0.39% | 1 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| Redmile Group, LLC | History | No change | 441,701 | 7,990 | 0.59% | 0.62% | 2 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| VANGUARD GROUP INC | History | Added to | 225,940 | 4,087 | 0.0% | 0.0% | 3 | +22,502 | 11.06% | Q4 2025 | Jan 29, 2026 |
| MARSHALL WACE, LLP | History | Added to | 148,632 | 2,688 | 0.0% | 0.0% | 4 | +32,836 | 28.36% | Q4 2025 | Feb 13, 2026 |
| GLOBEFLEX CAPITAL L P | History | Added to | 77,224 | 1,396 | 0.21% | 0.03% | 5 | +61,766 | 399.57% | Q4 2025 | Feb 11, 2026 |
| BlackRock, Inc. | History | Reduced | 67,108 | 1,213 | 0.0% | 0.0% | 6 | -2,725 | -3.9% | Q4 2025 | Feb 12, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Added to | 62,381 | 1,129 | 0.0% | 0.0% | 7 | +1,855 | 3.06% | Q4 2025 | Feb 09, 2026 |
| MACKENZIE FINANCIAL CORP | History | Reduced | 58,668 | 1,046 | 0.0% | 0.0% | 8 | -5,148 | -8.07% | Q4 2025 | Feb 18, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | History | Reduced | 54,048 | 976 | 0.0% | 0.0% | 9 | -2,368 | -4.2% | Q4 2025 | Feb 10, 2026 |
| STALEY CAPITAL ADVISERS INC | History | No change | 50,000 | 904 | 0.04% | 0.03% | 10 | 0 | 0.0% | Q4 2025 | Feb 05, 2026 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | History | Added to | 32,691 | 591 | 0.01% | 0.0% | 11 | +18,691 | 133.51% | Q4 2025 | Feb 17, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | Added to | 30,040 | 543 | 0.0% | 0.0% | 12 | +11,104 | 58.64% | Q4 2025 | Feb 12, 2026 |
| STATE STREET CORP | History | Added to | 26,453 | 478 | 0.0% | 0.0% | 13 | +1,200 | 4.75% | Q4 2025 | Feb 13, 2026 |
| Cambridge Investment Research Advisors, Inc. | History | Added to | 22,864 | 414 | 0.0% | 0.0% | 14 | +5,755 | 33.64% | Q4 2025 | Feb 05, 2026 |
| Quadrature Capital Ltd | History | Added to | 20,321 | 367 | 0.0% | 0.0% | 15 | +3,779 | 22.84% | Q4 2025 | Feb 17, 2026 |
| Point72 Asset Management, L.P. | History | New | 18,296 | 330 | 0.0% | — | 16 | +18,296 | New | Q4 2025 | Feb 17, 2026 |
| FMR LLC | History | No change | 17,156 | 310 | 0.0% | 0.0% | 17 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| MORGAN STANLEY | History | Reduced | 15,991 | 289 | 0.0% | 0.0% | 18 | -19,947 | -55.5% | Q4 2025 | Feb 13, 2026 |
| CITADEL ADVISORS LLC | History | New | 15,577 | 281 | 0.0% | — | 19 | +15,577 | New | Q4 2025 | Feb 17, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | New | 14,018 | 253 | 0.0% | — | 20 | +14,018 | New | Q4 2025 | Feb 17, 2026 |
| JANE STREET GROUP, LLC | History | Reduced | 13,990 | 253 | 0.0% | 0.0% | 21 | -8,070 | -36.58% | Q4 2025 | Feb 12, 2026 |
| NORTHERN TRUST CORP | History | Added to | 12,340 | 223 | 0.0% | 0.0% | 22 | +1,307 | 11.85% | Q4 2025 | Feb 17, 2026 |
| Walleye Capital LLC | History | New | 12,169 | 220 | 0.0% | — | 23 | +12,169 | New | Q4 2025 | Feb 13, 2026 |
| Connor, Clark & Lunn Investment Management Ltd. | History | New | 10,446 | 188 | 0.0% | — | 24 | +10,446 | New | Q4 2025 | Feb 10, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Added to | 10,387 | 187 | 0.0% | 0.0% | 25 | +4,542 | 77.71% | Q4 2025 | Feb 17, 2026 |
| DIMENSIONAL FUND ADVISORS LP | History | New | 10,028 | 181 | 0.0% | — | 26 | +10,028 | New | Q4 2025 | Feb 12, 2026 |
| Tower Research Capital LLC (TRC) | History | Added to | 1,737 | 31 | 0.0% | 0.0% | 27 | +1,395 | 407.89% | Q4 2025 | Feb 17, 2026 |
| UBS Group AG | History | Reduced | 1,397 | 25 | 0.0% | 0.0% | 28 | -15,871 | -91.91% | Q4 2025 | Jan 29, 2026 |
| SBI Securities Co., Ltd. | History | No change | 1,404 | 25 | 0.0% | 0.0% | 29 | 0 | 0.0% | Q4 2025 | Feb 03, 2026 |
| Private Wealth Asset Management, LLC | History | No change | 900 | 16 | 0.0% | 0.0% | 30 | 0 | 0.0% | Q4 2025 | Feb 10, 2026 |
| ROYAL BANK OF CANADA | History | New | 850 | 15 | 0.0% | — | 31 | +850 | New | Q4 2025 | Feb 17, 2026 |
| JONES FINANCIAL COMPANIES LLLP | History | No change | 703 | 12 | 0.0% | 0.0% | 32 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| WELLS FARGO & COMPANY/MN | History | No change | 251 | 4 | 0.0% | 0.0% | 33 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| JPMORGAN CHASE & CO | History | No change | 216 | 3 | 0.0% | 0.0% | 34 | 0 | 0.0% | Q4 2025 | Feb 11, 2026 |
| RHUMBLINE ADVISERS | History | No change | 175 | 3 | 0.0% | 0.0% | 35 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| Raiffeisen Bank International AG | History | No change | 200 | 3 | 0.0% | 0.0% | 36 | 0 | 0.0% | Q4 2025 | Feb 12, 2026 |
| Banque Transatlantique SA | History | No change | 176 | 3 | 0.0% | 0.0% | 37 | 0 | 0.0% | Q4 2025 | Feb 26, 2026 |
| FEDERATED HERMES, INC. | History | New | 130 | 2 | 0.0% | — | 38 | +130 | New | Q4 2025 | Feb 12, 2026 |
| GSA CAPITAL PARTNERS LLP | History | Closed out | 0 | 0 | — | 0.03% | — | -26,213 | -100.0% | Q3 2025 | Nov 07, 2025 |
| GROUP ONE TRADING LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -148 | -100.0% | Q3 2025 | Nov 12, 2025 |
| Alexis Investment Partners, LLC | History | Closed out | 0 | 0 | — | — | — | -15 | -100.0% | Q3 2025 | Nov 14, 2025 |
| BNP PARIBAS FINANCIAL MARKETS | History | Reduced | 46 | 0 | — | — | — | -4 | -8.0% | Q4 2025 | Feb 10, 2026 |
| OSAIC HOLDINGS, INC. | History | No change | 10 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| Rockefeller Capital Management L.P. | History | No change | 8 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Mar 16, 2026 |
| KERR FINANCIAL PLANNING Corp | History | No change | 24 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 10, 2026 |