Atara Biotherapeutics Ownership | Who Owns Atara Biotherapeutics?
Atara Biotherapeutics Ownership Summary
Atara Biotherapeutics is owned by 2.79% institutional investors, 20.58% insiders, and 76.63% retail investors. Ecor1 capital is the largest institutional shareholder, holding 4.70% of ATRA shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 2.17% of its assets in Atara Biotherapeutics shares.
ATRA Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Atara Biotherapeutics | 2.79% | 20.58% | 76.63% |
| Sector | Healthcare Stocks | 232.64% | 10.66% | -143.30% |
| Industry | Biotech Stocks | 382.13% | 10.41% | -292.54% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Ecor1 capital | 573.18K | 4.70% | $8.21M |
| Redmile group | 441.70K | 3.62% | $6.33M |
| Vanguard group | 225.94K | 1.67% | $4.09M |
| Marshall wace, llp | 115.80K | 0.95% | $1.66M |
| Globeflex capital l p | 77.22K | 0.57% | $1.40M |
| Mackenzie financial | 63.82K | 0.52% | $914.48K |
| Blackrock funding, inc. /de | 67.11K | 0.49% | $1.21M |
| Geode capital management | 62.38K | 0.46% | $1.13M |
| Acadian asset management | 54.05K | 0.40% | $976.00K |
| Staley capital advisers | 50.00K | 0.37% | $904.50K |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Redmile group | 441.70K | 0.62% | $6.33M |
| Ecor1 capital | 573.18K | 0.39% | $8.21M |
| Globeflex capital l p | 77.22K | 0.21% | $1.40M |
| Staley capital advisers | 50.00K | 0.04% | $904.50K |
| Bridgeway capital management | 14.00K | 0.00% | $200.62K |
| Quadrature capital | 16.54K | 0.00% | $236.88K |
| Private wealth asset management | 900.00 | 0.00% | $16.28K |
| Marshall wace, llp | 115.80K | 0.00% | $1.66M |
| Acadian asset management | 54.05K | 0.00% | $976.00K |
| Cambridge investment research advisors | 22.86K | 0.00% | $414.00K |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Marshall wace, llp | 115.80K | 0.00% | 73.44K |
| Globeflex capital l p | 77.22K | 0.21% | 61.77K |
| Mackenzie financial | 63.82K | 0.00% | 41.30K |
| Vanguard group | 225.94K | 0.00% | 22.50K |
| Quadrature capital | 16.54K | 0.00% | 16.54K |
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 |
|---|---|---|---|---|
| Quadrature capital | 16.54K | 0.00% | 16.54K | $236.88K |
| Connor, clark & lunn investment management | 10.45K | 0.00% | 10.45K | $188.97K |
| Dimensional fund advisors lp | 10.03K | - | 10.03K | $181.41K |
| Federated hermes | 130.00 | - | 130.00 | $2.35K |
| Rockefeller capital management | 8.00 | - | 8.00 | $115.00 |
Sold Out
| Holder | Change |
|---|---|
| Citigroup | -2.00 |
| 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 % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Mar 31, 2025 | 36 | -14.29% | 2,086,297 | -10.96% | 19 | 4.03% | 13 | -43.48% | 13 | 18.18% |
| Dec 31, 2024 | 2 | 100.00% | 63 | 80.00% | - | 360000.00% | 1 | - | - | - |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Vanguard Total Stock Mkt Idx Inv | 158.65K | 2.17% | - |
| Vanguard US Total Market Shares ETF | 120.26K | 2.05% | - |
| Mackenzie GQE US Small Cap F8 | 101.01K | 1.24% | 73.95K |
| Vanguard Institutional Extnd Mkt Idx Tr | 56.37K | 0.77% | - |
| Fidelity Extended Market Index | 29.88K | 0.37% | 258.00 |
| Bridgeway Ultra-Small Company | 18.69K | 0.26% | 18.69K |
| Fidelity VIP Disciplined Small Cap Init | 16.24K | 0.20% | - |
| Bridgeway Ultra-Small Company Market | 14.00K | 0.19% | - |
| Fidelity Enhanced Small Cap ETF | 10.45K | 0.18% | - |
| NT R2000 Value Index Fund - NL | 255.47K | 0.18% | - |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Mar 02, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | $508.30 |
| Mar 02, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | $121.85 |
| Mar 02, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | $1.92K |
| Mar 02, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | $8.14K |
| Mar 02, 2026 | Nguyen AnhCo | President and CEO | Sell | $1.01K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q1 | - | 9 |
| 2025 Q4 | - | 5 |
| 2025 Q3 | 2 | 6 |
| 2025 Q2 | - | 2 |
| 2025 Q1 | - | 3 |
ATRA Ownership FAQ
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