Atara BiotherapeuticsATRA
13F holders, Q3 2025 (September 30)36holders +4
7new positions
4sold out
1famous investor
$14.33avg. 13F price*
At the end of Q3 2025, 36 institutions reported holding Atara Biotherapeutics Inc. (ATRA) in their 13F filings, up 4 from Q2 2025. 7 opened new positions and 4 sold out. The largest holders were EcoR1 Capital, LLC ($8.2M), Redmile Group, LLC ($6.3M) and Vanguard Group Inc. ($2.9M). One famous investor held it Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio).
- Company
- Atara Biotherapeutics Inc.
- CUSIP
- 046513206
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 7 | $1.0M |
| Exits | 4 | $937K |
All 13F filers, Q2 2025 → Q3 2025: 238,746 shares bought and 158,984 shares sold, net +79,762 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 36 holders
| EcoR1 Capital, LLC | 0.40% | No change | 573,183 | $8.2M |
| Redmile Group, LLC | 0.62% | No change | 441,701 | $6.3M |
| Vanguard Group Inc. | 0.00% | Add +6.7% | 203,438 | $2.9M |
| Marshall Wace, LLP | 0.00% | Add +173.4% | 115,796 | $1.7M |
| BlackRock, Inc. | 0.00% | Reduce -1.4% | 69,833 | $1.0M |
| Mackenzie Financial Corp. | 0.00% | Add +183.4% | 63,816 | $914K |
| Geode Capital Management, LLC | 0.00% | Add +0.7% | 60,526 | $867K |
| Acadian Asset Management LLC | 0.00% | Reduce -13.4% | 56,416 | $807K |
| Staley Capital Advisers Inc. | 0.03% | Reduce -33.3% | 50,000 | $717K |
| Morgan Stanley | 0.00% | Add +140.8% | 35,938 | $515K |
| Gsa Capital Partners LLP | 0.03% | Add +33.8% | 26,213 | $376K |
| State Street Corp. | 0.00% | No change | 25,253 | $362K |
| Jane Street Group, LLC | 0.00% | New | 22,060 | $316K |
| Renaissance Technologies | 0.00% | Add +11.8% | 18,936 | $271K |
| UBS Group AG | 0.00% | Add +105.9% | 17,268 | $247K |
| FMR LLC | 0.00% | No change | 17,156 | $246K |
| Cambridge Investment Research Advisors, Inc. | 0.00% | New | 17,109 | $245K |
| Quadrature Capital Ltd | 0.00% | New | 16,542 | $237K |
| Globeflex Capital L P | 0.03% | New | 15,458 | $222K |
| Bridgeway Capital Management, LLC | 0.00% | No change | 14,000 | $201K |
| Northern Trust Corp. | 0.00% | Reduce -1.2% | 11,033 | $158K |
| Bank of America Corp. | 0.00% | Reduce -24.0% | 5,845 | $84K |
| SBI Securities Co., Ltd. | 0.00% | No change | 1,404 | $20K |
| Royal Bank of Canada | 0.00% | Reduce -16.6% | 1,209 | $17K |
| Private Wealth Asset Management, LLC | 0.00% | New | 900 | $13K |
| Jones Financial Companies LLLP | 0.00% | No change | 703 | $10K |
| Tower Research Capital LLC (TRC) | 0.00% | New | 342 | $5K |
| Wells Fargo & Company | 0.00% | Reduce -73.6% | 251 | $4K |
| JPMorgan Chase & Co. | 0.00% | No change | 216 | $3K |
| Banque Transatlantique SA | 0.00% | No change | 176 | $3K |
| Rhumbline Advisers | 0.00% | No change | 175 | $3K |
| Group One Trading LLC | 0.00% | No change | 148 | $2K |
| BNP Paribas Financial Markets | 0.00% | No change | 50 | $716 |
| KERR FINANCIAL PLANNING Corp | 0.00% | — | 24 | $322 |
| Osaic Holdings, Inc. | 0.00% | No change | 10 | $138 |
| Rockefeller Capital Management L.P. | 0.00% | New | 8 | $115 |
"% of holder's portfolio" is ATRA's weight in each manager's 13F, not the share of Atara Biotherapeutics Inc. the manager owns.