Atara Biotherapeutics (ATRA)
Supports Pierre Fabre’s global EBV-targeted tab-cel program through a lean partner-led operating model.
$8.47
vs last close−0.46 (−5.15%)
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13F · 13D/G · Form 4
| Institutions | 44.51% | 4.47M shares | |
|---|---|---|---|
| 36 holders · as of Jun 30, 2026 | |||
| Insiders | 6.43% | 645.4K shares | |
| 12 holders · as of Sep 4, 2026 | |||
| Strategic holders | 22.12% | 2.22M shares | |
| 2 holders · as of May 11, 2026 | |||
| Other | 26.94% | 2.70M shares | |
| remainder | |||
10.04M company shares as of Sep 23, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
Two share counts disagree (10.04M in the company's Sep 23, 2026 report, 9.01M elsewhere); stakes use the report.
13F, as of Jun 30, 2026
36 holders · 4.47M shares · 4 new positions · 16 increased · 8 reduced · 2 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Ecor1 Capital, LLC | 1.55M | 15.46% | +1.45M | Aug 14, 2026 |
| Adage Capital Partners GP, L.L.C. | 850.0K | 8.47% | +150.0K | Aug 14, 2026 |
| Point72 Asset Management, L.P. | 687.7K | 6.85% | +493.5K | Aug 14, 2026 |
| Redmile Group, LLC | 441.7K | 4.40% | 0 | Aug 14, 2026 |
| Vanguard Capital Management LLC | 247.0K | 2.46% | +29.2K | Aug 13, 2026 |
| Mackenzie Financial Corp | 233.2K | 2.32% | −80.4K | Aug 13, 2026 |
| BlackRock, Inc. | 84.5K | 0.84% | +5.4K | Aug 7, 2026 |
| Geode Capital Management, LLC | 75.1K | 0.75% | +9.0K | Aug 12, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Adiumentum Capital Fund I GP LLCincl. Gregory A. Ciongoli, Adiumentum Capital Fund I LP | 19.99% | 1.37M | 13D | May 16, 2025 |
| EcoR1 Capital, LLC | 17.40% | 1.55M | 13G | May 7, 2026 |
| Panacea Innovation Limitedincl. Panacea Venture Healthcare Fund II, L.P., James Huang +3 more | 16.10% | 1.32M | 13D | May 11, 2026 |
| Redmile Group, LLCincl. Redmile Strategic Long Only Trading Sub, Ltd., Redmile Biopharma Investments II, L.P. +1 more | 9.90% | 951.0K | 13D | Jul 24, 2026 |
| Adage Capital Management, L.P. | 8.56% | 700.0K | 13G | May 13, 2026 |
| Point72 Asset Management, L.P. | 6.20% | 526.7K | 13G | May 8, 2026 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Sep 4, 2026 | Brian N. Cherrydirector | Purchase | 104,166 | $9.60 | 166,486 |
| Aug 17, 2026 | AnhCo Nguyendirector, officer: President and CEO | Sale | 5,062 | $8.08 | 132,775 |
| May 18, 2026 | Yanina Grant-Huertaofficer: Chief Accounting Officer | Sale | 2,414 | $9.13 | 49,636 |
| May 18, 2026 | AnhCo Nguyendirector, officer: President and CEO | Sale | 5,241 | $9.13 | 137,837 |
| May 7, 2026 | EcoR1 Capital, LLC10 percent owner | Purchase | 507,407 | $9.35 | 1,552,000 |
| May 7, 2026 | Panacea Innovation Ltd10 percent owner | Sale | 313,446 | $10.10 | 1,011,000 |
| Mar 2, 2026 | AnhCo Nguyendirector, officer: President and CEO | Sale · 4 lots | 2,996 | $5.09 | 61,978 |
| Mar 2, 2026 | Yanina Grant-Huertaofficer: Chief Accounting Officer | Sale · 4 lots | 2,104 | $5.08 | 31,750 |
| Jan 12, 2026 | Panacea Innovation Ltd10 percent owner | Sale | 80,554 | $6.07 | 1,324,446 |
| Nov 17, 2025 | Yanina Grant-Huertaofficer: Chief Accounting Officer | Sale · 3 lots | 1,804 | $13.19 | 33,454 |
House and Senate disclosures
Not reported.