Atara Biotherapeutics, Inc.
ATRA- Exchange
- Nasdaq
- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0001604464
In the last 90 days, Atara Biotherapeutics, Inc. insiders filed 1 open-market purchase and 1 sale; 36 institutions reported holding it in 13F filings for Q2 2026, worth $51.3M in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in Atara Biotherapeutics, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 33
- −7 vs. Q4 2025
- Shares held
- 2.56M
- +740.5K (+40.6%) vs. Q4 2025
- Total value
- $12.1M
- −$20.8M (−63.2%) vs. Q4 2025
- New holders
- 7
- 10 more added
- Sold out
- 14
- 3 more reduced
1 institution that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ATRA on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 36 | $51.3M |
| Q1 2026 | 33 | $12.1M |
| Q4 2025 | 41 | $37.1M |
| Q3 2025 | 37 | $27.0M |
| Q2 2025 | 32 | $13.9M |
| Q1 2025 | 37 | $12.4M |
| Q4 2024 | 43 | $31.5M |
| Q3 2024 | 35 | $19.6M |
| Q2 2024 | 48 | $24.1M |
| Q1 2024 | 82 | $57.8M |
| Q4 2023 | 91 | $33.2M |
| Q3 2023 | 109 | $130.5M |
| Q2 2023 | 118 | $145.8M |
| Q1 2023 | 125 | $297.8M |
| Q4 2022 | 139 | $319.3M |
| Q3 2022 | 155 | $376.2M |
| Q2 2022 | 134 | $777.4M |
| Q1 2022 | 145 | $909.5M |
| Q4 2021 | 139 | $1.50B |
| Q3 2021 | 140 | $1.61B |
| Q2 2021 | 145 | $1.34B |
| Q1 2021 | 151 | $1.24B |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Atara Biotherapeutics, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Citigroup Inc | 1 | $5 | 0.00% | +1 | New |
| Rockefeller Capital Management L.P. | 8 | $38 | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 10 | $47 | 0.00% | 00.0% | Unchanged |
| Kerr Financial Planning Corp | 24 | $116 | 0.00% | 00.0% | Unchanged |
| PlanVest Financial, Inc | 28 | $132 | 0.00% | +28 | New |
| BNP Paribas Arbitrage, SA | 58 | $274 | 0.00% | +12+26.1% | Added |
| Rhumbline Advisers | 175 | $827 | 0.00% | 00.0% | Unchanged |
| Banque Transatlantique SA | 176 | $906 | 0.00% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 216 | $933 | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 251 | $1.19K | 0.00% | 00.0% | Unchanged |
| Jones Financial Companies LLLP | 703 | $3.23K | 0.00% | 00.0% | Unchanged |
| Vanguard Global Advisers, LLC | 1,456 | $6.89K | 0.00% | +1,456 | New |
| SBI Securities Co., Ltd. | 1,574 | $7.45K | 0.00% | +170+12.1% | Added |
| Royal Bank of Canada | 4,319 | $20.0K | 0.00% | +3,469+408.1% | Added |
| Morgan Stanley | 9,169 | $43.4K | 0.00% | −6,822−42.7% | Reduced |
| Northern Trust Corp | 12,340 | $58.4K | 0.00% | 00.0% | Unchanged |
| FMR LLC | 16,238 | $76.8K | 0.00% | −918−5.4% | Reduced |
| State Street Corp | 26,453 | $125.1K | 0.00% | 00.0% | Unchanged |
| Bridgeway Capital Management, LLC | 32,691 | $154.6K | 0.00% | 00.0% | Unchanged |
| Vanguard Fiduciary Trust Co | 33,621 | $159.0K | 0.00% | +33,621 | New |
| Jane Street Group, LLC | 33,870 | $160.2K | 0.00% | +19,880+142.1% | Added |
| Millennium Management LLC | 47,689 | $225.6K | 0.00% | +47,689 | New |
| Staley Capital Advisers Inc | 50,000 | $236.5K | 0.01% | 00.0% | Unchanged |
| UBS Group AG | 50,070 | $236.8K | 0.00% | +48,673+3,484.1% | Added |
| Geode Capital Management, LLC | 66,146 | $313.0K | 0.00% | +3,765+6.0% | Added |
| BlackRock, Inc. | 79,022 | $373.8K | 0.00% | +11,914+17.8% | Added |
| EcoR1 Capital, LLC | 99,593 | $471.1K | 0.02% | −473,590−82.6% | Reduced |
| Acadian Asset Management LLC | 130,910 | $617.0K | 0.00% | +76,862+142.2% | Added |
| Point72 Asset Management, L.P. | 194,264 | $918.9K | 0.00% | +175,968+961.8% | Added |
| Vanguard Capital Management LLC | 217,862 | $1.03M | 0.00% | +217,862 | New |
| Mackenzie Financial Corp | 313,620 | $1.48M | 0.00% | +254,952+434.6% | Added |
| Redmile Group, LLC | 441,701 | $2.09M | 0.14% | 00.0% | Unchanged |
| Adage Capital Partners GP, L.L.C. | 700,000 | $3.31M | 0.01% | +700,000 | New |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −148,632−100.0% | Sold out |
| Globeflex Capital L P | 0 | $0 | 0.00% | −77,224−100.0% | Sold out |
| Renaissance Technologies LLC | 0 | $0 | 0.00% | −30,040−100.0% | Sold out |
| Cambridge Investment Research Advisors, Inc. | 0 | $0 | 0.00% | −22,864−100.0% | Sold out |
| Quadrature Capital Ltd | 0 | $0 | 0.00% | −20,321−100.0% | Sold out |
| Citadel Advisors LLC | 0 | $0 | 0.00% | −15,577−100.0% | Sold out |
| Susquehanna International Group, LLP | 0 | $0 | 0.00% | −14,018−100.0% | Sold out |
| Walleye Capital LLC | 0 | $0 | 0.00% | −12,169−100.0% | Sold out |
| Connor, Clark & Lunn Investment Management Ltd. | 0 | $0 | 0.00% | −10,446−100.0% | Sold out |
| Bank of America Corp | 0 | $0 | 0.00% | −10,387−100.0% | Sold out |
| Dimensional Fund Advisors LP | 0 | $0 | 0.00% | −10,028−100.0% | Sold out |
| Tower Research Capital LLC (TRC) | 0 | $0 | 0.00% | −1,737−100.0% | Sold out |
| Private Wealth Asset Management, LLC | 0 | $0 | 0.00% | −900−100.0% | Sold out |
| Federated Hermes, Inc. | 0 | $0 | 0.00% | −130−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |