Atara Biotherapeutics Ownership | Who Owns Atara Biotherapeutics?
Atara Biotherapeutics Ownership Summary
Atara Biotherapeutics is owned by 31.73% institutional investors, 16.92% insiders, and 51.35% retail investors. Ecor1 capital is the largest institutional shareholder, holding 11.02% of ATRA shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 2.05% of its assets in Atara Biotherapeutics shares.
ATRA Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Atara Biotherapeutics | 31.73% | 16.92% | 51.35% |
| Sector | Healthcare Stocks | 50.50% | 12.33% | 37.17% |
| Industry | Biotech Stocks | 49.09% | 12.06% | 38.85% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Ecor1 capital | 1.55M | 11.02% | $17.82M |
| Adage capital partners gp | 850.00K | 6.04% | $9.76M |
| Point72 asset management | 687.72K | 4.88% | $7.90M |
| Redmile group | 441.70K | 3.14% | $5.07M |
| Vanguard capital management | 247.05K | 1.75% | $2.84M |
| Vanguard group | 225.94K | 1.67% | $4.09M |
| Mackenzie financial | 233.25K | 1.66% | $2.68M |
| Blackrock funding, inc. /de | 84.45K | 0.60% | $969.54K |
| Geode capital management | 75.13K | 0.53% | $862.92K |
| Staley capital advisers | 50.00K | 0.36% | $574.00K |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Ecor1 capital | 1.55M | 0.87% | $17.82M |
| Redmile group | 441.70K | 0.34% | $5.07M |
| Staley capital advisers | 50.00K | 0.02% | $574.00K |
| Adage capital partners gp | 850.00K | 0.01% | $9.76M |
| Point72 asset management | 687.72K | 0.01% | $7.90M |
| Bridgeway capital management | 14.00K | 0.00% | $160.72K |
| Mackenzie financial | 233.25K | 0.00% | $2.68M |
| Xtx topco | 15.30K | 0.00% | $175.68K |
| Acadian asset management | 38.84K | 0.00% | $444.00K |
| Caitong asset management | 311.00 | 0.00% | $3.57K |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Ecor1 capital | 1.55M | 0.87% | 1.45M |
| Point72 asset management | 687.72K | 0.01% | 493.45K |
| Adage capital partners gp | 850.00K | 0.01% | 150.00K |
| Vanguard capital management | 247.05K | 0.00% | 29.18K |
| Vanguard group | 225.94K | 0.00% | 22.50K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Blackrock | - | - | -6.83M |
| Bank of america corp /de/ | - | - | -6.58M |
| Price t rowe associates inc /md/ | - | - | -4.96M |
| Aqr capital management | - | - | -2.63M |
| Woodline partners lp | - | - | -1.77M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Xtx topco | 15.30K | 0.00% | 15.30K | $175.68K |
| Caitong asset management | 311.00 | 0.00% | 311.00 | $3.57K |
| Barclays | 304.00 | - | 304.00 | $3.49K |
Sold Out
| Holder | Change |
|---|---|
| Western wealth management | -1.00 |
| Nelson, van denburg & campbell wealth management group | -23.00 |
| Eversource wealth advisors | -35.00 |
| Nisa investment advisors | -50.00 |
| Gamma investing | -56.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 30, 2026 | 36 | 5.88% | 4,467,954 | 74.24% | 31 | 9.57% | 16 | -5.88% | 8 | 166.67% |
| Mar 31, 2026 | 33 | -21.43% | 2,564,230 | 25.10% | 20 | 8.95% | 16 | -15.79% | 3 | -62.50% |
| Dec 31, 2025 | 7 | -81.08% | 379,045 | -79.87% | 2 | 1.17% | 3 | -81.25% | 1 | -85.71% |
| Sep 30, 2025 | 8 | -73.33% | 233,049 | -86.80% | 1 | 0.91% | 3 | -62.50% | - | -100.00% |
| Jun 30, 2025 | 32 | -8.57% | 1,803,950 | 19.18% | 14 | 7.48% | 11 | -8.33% | 6 | -53.85% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Vanguard US Total Market Shares ETF | 120.26K | 2.05% | - |
| Mackenzie Quantitative US Small Cap | 167.40K | 1.86% | 154.50K |
| Vanguard Total Stock Mkt Idx Inv | 158.65K | 1.76% | - |
| Vanguard Morn Total Stk Mkt Idx Investor | 158.65K | 1.76% | - |
| Vanguard Institutional Extnd Mkt Idx Tr | 82.76K | 0.92% | 24.54K |
| Mackenzie GQE US Small Cap F8 | 74.89K | 0.83% | -27.63K |
| Fidelity Extended Market Index | 36.40K | 0.40% | 7.00K |
| Bridgeway Ultra-Small Company | 18.69K | 0.22% | - |
| iShares Micro-Cap ETF | 17.00K | 0.19% | -226.00 |
| Fidelity Enhanced Small Cap ETF | 10.45K | 0.18% | - |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| May 18, 2026 | Nguyen AnhCo | President and CEO | Sell | $47.84K |
| May 18, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | $22.04K |
| May 07, 2026 | Panacea Innovation Ltd | - | Sell | $3.17M |
| May 07, 2026 | EcoR1 Capital, LLC | - | Buy | $4.74M |
| Mar 02, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | $121.85 |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q3 | - | - |
| 2026 Q2 | 1 | 3 |
| 2026 Q1 | - | 9 |
| 2025 Q4 | - | 5 |
| 2025 Q3 | 2 | 6 |
ATRA Ownership FAQ
Try Tickergate Pro Free
Customize Everything. 100% Flexibility. Fast and Easy to Use (No code or Excel Needed)
Customize your own personal stocks lists, views and charts
Choose from hundreds of fields, up to 15 years of history
Conduct deep comparison analysis
Discover trending investment themes
Find your next best investment
Research stocks using tools