Atara Biotherapeutics Ownership | Who Owns Atara Biotherapeutics?
Atara Biotherapeutics Ownership Summary
Atara Biotherapeutics is owned by 20.44% institutional investors, 16.74% insiders, and 62.82% retail investors. Adage capital partners gp is the largest institutional shareholder, holding 5.58% 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 | 20.44% | 16.74% | 62.82% |
| Sector | Healthcare Stocks | 35.49% | 11.75% | 52.76% |
| Industry | Biotech Stocks | 34.83% | 11.71% | 53.46% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Adage capital partners gp | 700.00K | 5.58% | $3.31M |
| Redmile group | 441.70K | 3.52% | $2.09M |
| Mackenzie financial | 313.62K | 2.50% | $1.48M |
| Vanguard group | 225.94K | 1.67% | $4.09M |
| Point72 asset management | 194.26K | 1.55% | $918.87K |
| Acadian asset management | 130.91K | 1.04% | $617.00K |
| Ecor1 capital | 99.59K | 0.79% | $471.07K |
| Blackrock funding, inc. /de | 79.02K | 0.63% | $373.77K |
| Geode capital management | 66.15K | 0.53% | $313.05K |
| Ubs group | 50.07K | 0.40% | $236.83K |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Redmile group | 441.70K | 0.14% | $2.09M |
| Ecor1 capital | 99.59K | 0.02% | $471.07K |
| Staley capital advisers | 50.00K | 0.01% | $236.50K |
| Adage capital partners gp | 700.00K | 0.01% | $3.31M |
| Bridgeway capital management | 32.69K | 0.00% | $154.63K |
| Mackenzie financial | 313.62K | 0.00% | $1.48M |
| Point72 asset management | 194.26K | 0.00% | $918.87K |
| Acadian asset management | 130.91K | 0.00% | $617.00K |
| Sbi securities | 1.57K | 0.00% | $7.45K |
| Vanguard group | 225.94K | 0.00% | $4.09M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Adage capital partners gp | 700.00K | 0.01% | 700.00K |
| Mackenzie financial | 313.62K | 0.00% | 254.95K |
| Point72 asset management | 194.26K | 0.00% | 175.97K |
| Acadian asset management | 130.91K | 0.00% | 76.86K |
| Ubs group | 50.07K | - | 48.67K |
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 |
|---|---|---|---|---|
| Adage capital partners gp | 700.00K | 0.01% | 700.00K | $3.31M |
| Millennium management | 47.69K | 0.00% | 47.69K | $225.57K |
| Vanguard fiduciary trust | 33.62K | - | 33.62K | $159.03K |
| Vanguard global advisers | 1.46K | - | 1.46K | $6.89K |
| Citigroup | 1.00 | - | 1.00 | $5.00 |
Sold Out
| Holder | Change |
|---|---|
| Nelson, van denburg & campbell wealth management group | -23.00 |
| Eversource wealth advisors | -35.00 |
| Nisa investment advisors | -50.00 |
| Gamma investing | -56.00 |
| Point72 (difc) | -68.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Mar 31, 2025 | 36 | -14.29% | 2,086,297 | -10.96% | 19 | 4.03% | 13 | -43.48% | 13 | 18.18% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Vanguard US Total Market Shares ETF | 120.26K | 2.05% | - |
| Vanguard Total Stock Mkt Idx Inv | 158.65K | 1.94% | - |
| Mackenzie GQE US Small Cap F8 | 118.39K | 1.39% | 17.38K |
| Vanguard Institutional Extnd Mkt Idx Tr | 56.37K | 0.69% | - |
| Fidelity Extended Market Index | 32.02K | 0.38% | 2.14K |
| Bridgeway Ultra-Small Company | 18.69K | 0.26% | 18.69K |
| Bridgeway Ultra-Small Company Market | 14.00K | 0.19% | - |
| Fidelity VIP Disciplined Small Cap Init | 16.24K | 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 |
|---|---|---|---|---|
| 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 |
| Mar 02, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | $8.14K |
| Mar 02, 2026 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | $1.92K |
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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