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 |
|---|---|---|---|---|---|
| Adage Capital Partners GP, L.L.C. | 700,000 | $3.31M | 0.01% | +700,000 | New |
| Redmile Group, LLC | 441,701 | $2.09M | 0.14% | 00.0% | Unchanged |
| Mackenzie Financial Corp | 313,620 | $1.48M | 0.00% | +254,952+434.6% | Added |
| Vanguard Capital Management LLC | 217,862 | $1.03M | 0.00% | +217,862 | New |
| Point72 Asset Management, L.P. | 194,264 | $918.9K | 0.00% | +175,968+961.8% | Added |
| Acadian Asset Management LLC | 130,910 | $617.0K | 0.00% | +76,862+142.2% | Added |
| EcoR1 Capital, LLC | 99,593 | $471.1K | 0.02% | −473,590−82.6% | Reduced |
| BlackRock, Inc. | 79,022 | $373.8K | 0.00% | +11,914+17.8% | Added |
| Geode Capital Management, LLC | 66,146 | $313.0K | 0.00% | +3,765+6.0% | Added |
| UBS Group AG | 50,070 | $236.8K | 0.00% | +48,673+3,484.1% | Added |
| Staley Capital Advisers Inc | 50,000 | $236.5K | 0.01% | 00.0% | Unchanged |
| Millennium Management LLC | 47,689 | $225.6K | 0.00% | +47,689 | New |
| Jane Street Group, LLC | 33,870 | $160.2K | 0.00% | +19,880+142.1% | Added |
| Vanguard Fiduciary Trust Co | 33,621 | $159.0K | 0.00% | +33,621 | New |
| Bridgeway Capital Management, LLC | 32,691 | $154.6K | 0.00% | 00.0% | Unchanged |
| State Street Corp | 26,453 | $125.1K | 0.00% | 00.0% | Unchanged |
| FMR LLC | 16,238 | $76.8K | 0.00% | −918−5.4% | Reduced |
| Northern Trust Corp | 12,340 | $58.4K | 0.00% | 00.0% | Unchanged |
| Morgan Stanley | 9,169 | $43.4K | 0.00% | −6,822−42.7% | Reduced |
| Royal Bank of Canada | 4,319 | $20.0K | 0.00% | +3,469+408.1% | Added |
| SBI Securities Co., Ltd. | 1,574 | $7.45K | 0.00% | +170+12.1% | Added |
| Vanguard Global Advisers, LLC | 1,456 | $6.89K | 0.00% | +1,456 | New |
| Jones Financial Companies LLLP | 703 | $3.23K | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 251 | $1.19K | 0.00% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 216 | $933 | 0.00% | 00.0% | Unchanged |
| Banque Transatlantique SA | 176 | $906 | 0.00% | 00.0% | Unchanged |
| Rhumbline Advisers | 175 | $827 | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 58 | $274 | 0.00% | +12+26.1% | Added |
| PlanVest Financial, Inc | 28 | $132 | 0.00% | +28 | New |
| Kerr Financial Planning Corp | 24 | $116 | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 10 | $47 | 0.00% | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 8 | $38 | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 1 | $5 | 0.00% | +1 | 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 |