ATRA Atara Biotherapeutics, Inc.
Atara Biotherapeutics, Inc. (ATRA) Institutional Ownership
What the institutions did with ATRA last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| EcoR1 Capital, LLC | 1.6M | 34.7% |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 850.0K | 19.0% |
| Point72 Asset Management, L.P. | 687.7K | 15.4% |
| Redmile Group, LLC | 441.7K | 9.9% |
| VANGUARD CAPITAL MANAGEMENT LLC | 247.0K | 5.5% |
| MACKENZIE FINANCIAL CORP | 233.2K | 5.2% |
| BlackRock, Inc. | 84.5K | 1.9% |
| GEODE CAPITAL MANAGEMENT, LLC | 75.1K | 1.7% |
| STALEY CAPITAL ADVISERS INC | 50.0K | 1.1% |
| VANGUARD FIDUCIARY TRUST CO | 43.0K | 1.0% |
| ACADIAN ASSET MANAGEMENT LLC | 38.8K | 0.9% |
| JANE STREET GROUP, LLC | 30.3K | 0.7% |
| STATE STREET CORP | 26.5K | 0.6% |
| NORTHERN TRUST CORP | 16.6K | 0.4% |
| FMR LLC | 16.2K | 0.4% |
| XTX Topco Ltd | 15.3K | 0.3% |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 14.0K | 0.3% |
| MILLENNIUM MANAGEMENT LLC | 12.7K | 0.3% |
| CITADEL ADVISORS LLC | 10.2K | 0.2% |
| MORGAN STANLEY | 9.2K | 0.2% |
| ROYAL BANK OF CANADA | 4.7K | 0.1% |
| UBS Group AG | 4.0K | 0.1% |
| Vanguard Global Advisers, LLC | 1.5K | 0.0% |
| SBI Securities Co., Ltd. | 1.4K | 0.0% |
| JONES FINANCIAL COMPANIES LLLP | 803 | 0.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| EcoR1 Capital, LLC | Increased | 99.6K | 1.6M | +1.5M |
| Point72 Asset Management, L.P. | Increased | 194.3K | 687.7K | +493.5K |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Increased | 700.0K | 850.0K | +150.0K |
| ACADIAN ASSET MANAGEMENT LLC | Reduced | 130.9K | 38.8K | -92.1K |
| MACKENZIE FINANCIAL CORP | Reduced | 313.6K | 233.2K | -80.4K |
| UBS Group AG | Reduced | 50.1K | 4.0K | -46.1K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 47.7K | 12.7K | -35.0K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 217.9K | 247.0K | +29.2K |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | Reduced | 32.7K | 14.0K | -18.7K |
| XTX Topco Ltd | New | 0 | 15.3K | +15.3K |
| CITADEL ADVISORS LLC | New | 0 | 10.2K | +10.2K |
| VANGUARD FIDUCIARY TRUST CO | Increased | 33.6K | 43.0K | +9.4K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 66.1K | 75.1K | +9.0K |
| BlackRock, Inc. | Increased | 79.0K | 84.5K | +5.4K |
| NORTHERN TRUST CORP | Increased | 12.3K | 16.6K | +4.3K |
| JANE STREET GROUP, LLC | Reduced | 33.9K | 30.3K | -3.5K |
| ROYAL BANK OF CANADA | Increased | 4.3K | 4.7K | +424 |
| Caitong International Asset Management Co., Ltd | New | 0 | 311 | +311 |
| BARCLAYS PLC | New | 0 | 304 | +304 |
| RHUMBLINE ADVISERS | Sold Out | 175 | 0 | -175 |
| SBI Securities Co., Ltd. | Reduced | 1.6K | 1.4K | -170 |
| JONES FINANCIAL COMPANIES LLLP | Increased | 703 | 803 | +100 |
| CITIGROUP INC | Increased | 1 | 97 | +96 |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | 58 | 46 | -12 |
| MORGAN STANLEY | Increased | 9.2K | 9.2K | +9 |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.