Atara BiotherapeuticsATRA
13F holders, Q4 2025 (December 31)At the end of Q4 2025, 41 institutions reported holding Atara Biotherapeutics Inc. (ATRA) in their 13F filings, up 5 from Q3 2025. 7 opened new positions and 2 sold out. The largest holders were EcoR1 Capital, LLC ($10.4M), Redmile Group, LLC ($8.0M) and Vanguard Group Inc. ($4.1M). 3 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Steve Cohen (0.0% of Point72 Asset Management's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Atara Biotherapeutics Inc.
- CUSIP
- 046513206
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 7 | $1.5M |
| Exits | 2 | $378K |
All 13F filers, Q3 2025 → Q4 2025: 247,396 shares bought and 80,853 shares sold, net +166,543 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 41 holders
| EcoR1 Capital, LLC | 0.48% | No change | 573,183 | $10.4M |
| Redmile Group, LLC | 0.59% | No change | 441,701 | $8.0M |
| Vanguard Group Inc. | 0.00% | Add +11.1% | 225,940 | $4.1M |
| Marshall Wace, LLP | 0.00% | Add +28.4% | 148,632 | $2.7M |
| Globeflex Capital L P | 0.21% | Add +399.6% | 77,224 | $1.4M |
| BlackRock, Inc. | 0.00% | Reduce -3.9% | 67,108 | $1.2M |
| Geode Capital Management, LLC | 0.00% | Add +3.1% | 62,381 | $1.1M |
| Mackenzie Financial Corp. | 0.00% | Reduce -8.1% | 58,668 | $1.0M |
| Acadian Asset Management LLC | 0.00% | Reduce -4.2% | 54,048 | $976K |
| Staley Capital Advisers Inc. | 0.04% | No change | 50,000 | $905K |
| Bridgeway Capital Management, LLC | 0.01% | Add +133.5% | 32,691 | $591K |
| Renaissance Technologies | 0.00% | Add +58.6% | 30,040 | $543K |
| State Street Corp. | 0.00% | Add +4.8% | 26,453 | $479K |
| Cambridge Investment Research Advisors, Inc. | 0.00% | Add +33.6% | 22,864 | $414K |
| Quadrature Capital Ltd | 0.00% | Add +22.8% | 20,321 | $368K |
| Point72 Asset Management | 0.00% | New | 18,296 | $331K |
| FMR LLC | 0.00% | No change | 17,156 | $310K |
| Morgan Stanley | 0.00% | Reduce -55.5% | 15,991 | $289K |
| Citadel Advisors | 0.00% | New | 15,577 | $282K |
| Susquehanna International Group, LLP | 0.00% | New | 14,018 | $254K |
| Jane Street Group, LLC | 0.00% | Reduce -36.6% | 13,990 | $253K |
| Northern Trust Corp. | 0.00% | Add +11.8% | 12,340 | $223K |
| Walleye Capital LLC | 0.00% | New | 12,169 | $220K |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | New | 10,446 | $189K |
| Bank of America Corp. | 0.00% | Add +77.7% | 10,387 | $188K |
| Dimensional Fund Advisors LP | 0.00% | New | 10,028 | $181K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +407.9% | 1,737 | $31K |
| SBI Securities Co., Ltd. | 0.00% | No change | 1,404 | $25K |
| UBS Group AG | 0.00% | Reduce -91.9% | 1,397 | $25K |
| Private Wealth Asset Management, LLC | 0.00% | No change | 900 | $16K |
| Royal Bank of Canada | 0.00% | Reduce -29.7% | 850 | $15K |
| Jones Financial Companies LLLP | 0.00% | No change | 703 | $13K |
| Wells Fargo & Company | 0.00% | No change | 251 | $5K |
| JPMorgan Chase & Co. | 0.00% | No change | 216 | $4K |
| Banque Transatlantique SA | 0.00% | No change | 176 | $3K |
| Rhumbline Advisers | 0.00% | No change | 175 | $3K |
| Federated Hermes, Inc. | 0.00% | New | 130 | $2K |
| BNP Paribas Financial Markets | 0.00% | Reduce -8.0% | 46 | $832 |
| Osaic Holdings, Inc. | 0.00% | No change | 10 | $180 |
| Rockefeller Capital Management L.P. | 0.00% | No change | 8 | $145 |
| KERR FINANCIAL PLANNING Corp | 0.00% | No change | 24 | $112 |
"% of holder's portfolio" is ATRA's weight in each manager's 13F, not the share of Atara Biotherapeutics Inc. the manager owns.