Atara BiotherapeuticsATRA
13F holders, Q2 2026 (June 30)At the end of Q2 2026, 35 institutions reported holding Atara Biotherapeutics Inc. (ATRA) in their 13F filings, up 3 from Q1 2026. 4 opened new positions and 1 sold out. The largest holders were EcoR1 Capital, LLC ($17.8M), Adage Capital Partners Gp, L.L.C. ($9.8M) and Point72 Asset Management ($7.9M). 3 famous investors held it, including Steve Cohen (0.0% of Point72 Asset Management's portfolio), Israel Englander (0.0% of Millennium 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 Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 4 | $299K |
| Exits | 1 | $827 |
All 13F filers, Q1 2026 → Q2 2026: 2,179,833 shares bought and 276,109 shares sold, net +1,903,724 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 35 holders
| EcoR1 Capital, LLC | 0.88% | Add +1458.3% | 1,552,000 | $17.8M |
| Adage Capital Partners Gp, L.L.C. | 0.01% | Add +21.4% | 850,000 | $9.8M |
| Point72 Asset Management | 0.01% | Add +254.0% | 687,718 | $7.9M |
| Redmile Group, LLC | 0.34% | No change | 441,701 | $5.1M |
| Vanguard Capital Management LLC | 0.00% | Add +13.4% | 247,047 | $2.8M |
| Mackenzie Financial Corp. | 0.00% | Reduce -25.6% | 233,249 | $2.7M |
| BlackRock, Inc. | 0.00% | Add +6.9% | 84,455 | $970K |
| Geode Capital Management, LLC | 0.00% | Add +13.6% | 75,128 | $863K |
| Staley Capital Advisers Inc. | 0.02% | No change | 50,000 | $574K |
| Vanguard Fiduciary Trust Co. | 0.00% | Add +28.0% | 43,036 | $494K |
| Acadian Asset Management LLC | 0.00% | Reduce -70.3% | 38,845 | $444K |
| Jane Street Group, LLC | 0.00% | Reduce -10.4% | 30,345 | $348K |
| State Street Corp. | 0.00% | No change | 26,453 | $304K |
| Northern Trust Corp. | 0.00% | Add +34.5% | 16,591 | $190K |
| FMR LLC | 0.00% | No change | 16,238 | $186K |
| XTX Topco Ltd | 0.00% | New | 15,303 | $176K |
| Bridgeway Capital Management, LLC | 0.00% | Reduce -57.2% | 14,000 | $161K |
| Millennium Management | 0.00% | Reduce -73.4% | 12,680 | $146K |
| Citadel Advisors | 0.00% | New | 10,159 | $117K |
| Morgan Stanley | 0.00% | Add +0.1% | 9,178 | $105K |
| Royal Bank of Canada | 0.00% | Add +9.8% | 4,743 | $55K |
| UBS Group AG | 0.00% | Reduce -92.0% | 3,979 | $46K |
| Vanguard Global Advisers, LLC | 0.00% | No change | 1,456 | $17K |
| SBI Securities Co., Ltd. | 0.00% | Reduce -10.8% | 1,404 | $16K |
| Jones Financial Companies LLLP | 0.00% | Add +14.2% | 803 | $8K |
| Caitong International Asset Management Co., Ltd | 0.00% | New | 311 | $4K |
| Barclays PLC | 0.00% | New | 304 | $3K |
| Banque Transatlantique SA | 0.00% | No change | 176 | $3K |
| Wells Fargo & Company | 0.00% | No change | 251 | $3K |
| JPMorgan Chase & Co. | 0.00% | No change | 216 | $2K |
| Citigroup Inc. | 0.00% | Add +9600.0% | 97 | $1K |
| BNP Paribas Financial Markets | 0.00% | Reduce -20.7% | 46 | $528 |
| KERR FINANCIAL PLANNING Corp | 0.00% | No change | 24 | $276 |
| Osaic Holdings, Inc. | 0.00% | No change | 10 | $114 |
| Rockefeller Capital Management L.P. | 0.00% | No change | 8 | $92 |
"% of holder's portfolio" is ATRA's weight in each manager's 13F, not the share of Atara Biotherapeutics Inc. the manager owns.