ATRANasdaqBiological Products, (No Diagnostic Substances)Fiscal year ends December 31
Atara Biotherapeutics, Inc.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 12, 2026
$8.96−0.22 (-2.40%)
Close on Oct 19, 2026
- Market cap
- $134.70M
- P/E (TTM)
- 3.5
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
44.5%
4M of 10M shares
Institutional holders
35
4 new, 1 sold out
Net institutional buying
2M
In Q2 2026
Insider trades, 12 months
2 buys · 18 sales
Net bought $1.89M
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Green Jeremy | 950,994 | 9.90% | 13D (active) amendment | Jul 22, 2026 |
| Jeremy C. Green | 950,994 | 9.90% | 13D (active) amendment | May 12, 2026 |
| Adage Capital Management, L.P. | 700,000 | 8.56% | 13G (passive) | Mar 31, 2026 |
| Steven A. Cohen | 687,718 | 7.60% | 13G (passive) amendment | Jun 30, 2026 |
| Panacea Venture Healthcare Fund II, L.P. | 550,000 | 9.50% | 13G (passive) | Jan 30, 2025 |
| Panacea Innovation Limited | 1,712,900 | 20.00% | 13D (active) amendment | Aug 15, 2025 |
| EcoR1 Capital, LLC | 1,552,000 | 17.40% | 13G (passive) amendment | May 7, 2026 |
| Adiumentum Capital Fund I GP LLC | 1,370,081 | 19.99% | 13D (active) amendment | May 14, 2025 |
| James Huang | 1,318,894 | 16.10% | 13D (active) amendment | May 7, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of ATRA | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | 1,552,000 | 15.46% | $17.82M | +1,452,407 | 0.87% |
| Adage Capital Partners Gp, L.L.C. | 850,000 | 8.47% | $9.76M | +150,000 | 0.01% |
| Point72 Asset Management, L.P. | 687,718 | 6.85% | $7.90M | +493,454 | 0.01% |
| Redmile Group, LLC | 441,701 | 4.40% | $5.07M | – | 0.34% |
| Vanguard Capital Management LLC | 247,047 | 2.46% | $2.84M | +29,185 | 0.00% |
| Mackenzie Financial Corp | 233,249 | 2.32% | $2.68M | −80,371 | 0.00% |
| BlackRock, Inc. | 84,455 | 0.84% | $969.54K | +5,433 | 0.00% |
| Geode Capital Management, LLC | 75,128 | 0.75% | $862.92K | +8,982 | 0.00% |
| Staley Capital Advisers Inc | 50,000 | 0.50% | $574.00K | – | 0.02% |
| Vanguard Fiduciary Trust Co | 43,036 | 0.43% | $494.05K | +9,415 | 0.00% |
| Acadian Asset Management LLC | 38,845 | 0.39% | $444 | −92,065 | 0.00% |
| Jane Street Group, LLC | 30,345 | 0.30% | $348.36K | −3,525 | 0.00% |
| State Street Corp | 26,453 | 0.26% | $303.68K | – | 0.00% |
| Northern Trust Corp | 16,591 | 0.17% | $190.47K | +4,251 | 0.00% |
| FMR LLC | 16,238 | 0.16% | $186.41K | – | 0.00% |
| XTX Topco Ltd | 15,303 | 0.15% | $175.68K | New | 0.00% |
| Bridgeway Capital Management, LLC | 14,000 | 0.14% | $160.72K | −18,691 | 0.00% |
| Millennium Management LLC | 12,680 | 0.13% | $145.57K | −35,009 | 0.00% |
| Citadel Advisors LLC | 10,159 | 0.10% | $116.63K | New | 0.00% |
| Morgan Stanley | 9,178 | 0.09% | $105.37K | +9 | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 35 | 4M | 44.5% | 4 / 12 | 8 / 1 | 2M | 0M |
| Q1 2026 | 32 | 3M | 25.5% | 6 / 10 | 3 / 14 | 2M | 1M |
| Q4 2025 | 41 | 2M | 20.4% | 7 / 12 | 9 / 2 | 0M | 0M |
| Q3 2025 | 36 | 2M | 18.8% | 8 / 9 | 7 / 4 | 0M | 0M |
| Q2 2025 | 32 | 2M | 18.0% | 4 / 5 | 6 / 9 | 0M | 0M |
| Q1 2025 | 37 | 2M | 20.8% | 5 / 8 | 14 / 9 | 0M | 0M |
| Q4 2024 | 41 | 2M | 23.8% | 10 / 13 | 11 / 3 | 0M | 0M |
| Q3 2024 | 34 | 2M | 24.1% | 4 / 13 | 10 / 13 | 0M | 0M |
| Q2 2024 | 44 | 3M | 26.5% | 44 / 0 | 0 / 0 | 3M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of ATRA | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 158,646 | 1.58% | $1.82M | 0.00% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 82,758 | 0.82% | $950.06K | 0.00% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 29,408 | 0.29% | $309.08K | 0.00% | May 31, 2026 |
| iShares Micro-Cap ETF | 17,227 | 0.17% | $197.77K | 0.01% | Jun 30, 2026 |
| VIP Disciplined Small Cap Portfolio | 16,238 | 0.16% | $186.41K | 0.03% | Jun 30, 2026 |
| Ultra-Small Company Market Fund | 14,000 | 0.14% | $160.72K | 0.11% | Jun 30, 2026 |
| Fidelity Total Market Index Fund | 10,479 | 0.10% | $110.13K | 0.00% | May 31, 2026 |
| Fidelity Series Total Market Index Fund | 8,665 | 0.09% | $91.07K | 0.00% | May 31, 2026 |
| Fidelity Nasdaq Composite Index Fund | 4,612 | 0.05% | $48.47K | 0.00% | May 31, 2026 |
| Vanguard Institutional Total Stock Market Index Fund | 2,844 | 0.03% | $32.65K | 0.00% | Jun 30, 2026 |
| Vanguard Balanced Index Fund | 2,799 | 0.03% | $32.13K | 0.00% | Jun 30, 2026 |
| Schwab Total Stock Market Index Fund | 1,643 | 0.02% | $13.77K | 0.00% | Jul 31, 2026 |
| 1290 VT Micro Cap Portfolio | 1,147 | 0.01% | $13.17K | 0.01% | Jun 30, 2026 |
| Total Stock Market Index Trust | 210 | 0.00% | $2.41K | 0.00% | Jun 30, 2026 |
| Dimensional U.S. Small Cap ETF | 135 | 0.00% | $1.13K | 0.00% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| AnhCo Nguyen | President and CEO, Director | 132,775 | 1.32% | Aug 26, 2026 |
| Kevin G. Sarney | Interim CFO | – | – | Jul 6, 2026 |
| Yanina Grant-Huerta | Chief Accounting Officer | 49,636 | 0.49% | May 20, 2026 |
| Jill Henrich | EVP, Chief Regulatory Officer | 18,679 | 0.19% | Mar 5, 2025 |
| Brian N. Cherry | Director | 166,486 | 1.66% | Sep 4, 2026 |
| Redmile Group, LLC | Director | 636,912 | 6.35% | Jul 24, 2026 |
| Jeremy Green | Director | 441,701 | 4.40% | Jul 24, 2026 |
| Matthew K. Fust | Director | 30,188 | 0.30% | Jun 11, 2026 |
| William K. Heiden | Director | 34,188 | 0.34% | Jun 11, 2026 |
| Gregory Austin Ciongoli | Director, 10% owner | 1,221,395 | 12.17% | Jun 11, 2026 |
| James Huang | Director, 10% owner | 1,324,446 | 13.19% | May 11, 2026 |
| Carol Giltner Gallagher | Director | 95,668 | 0.95% | Jun 12, 2025 |
| Ameet Mallik | Director | 16,928 | 0.17% | Jun 12, 2025 |
| Pascal Touchon | Director | 77,955 | 0.78% | Jun 12, 2025 |
| Maria Grazia Roncarolo | Director | 17,368 | 0.17% | Jun 12, 2025 |
| Nachiappan Subramanian | Director | – | – | May 23, 2025 |
| Capital Fund I. GP LLC Adiumentum | Director, 10% owner | 1,209,395 | 12.05% | May 16, 2025 |
| Capital Fund I. LP Adiumentum | Director, 10% owner | – | – | May 16, 2025 |
| Innovation Ltd Panacea | 10% owner | 1,318,894 | 13.14% | May 11, 2026 |
| EcoR1 Capital, LLC | 10% owner | 1,552,000 | 15.46% | May 11, 2026 |
| Eric J. Hyllengren | – | 56,231 | 0.56% | Apr 2, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Brian N. Cherry Director | Sep 4, 2026 | Buy | +104,166 | $9.60 | $999.99K | 166,486 |
| AnhCo Nguyen President and CEO, Director | Aug 17, 2026 | Sale | −5,062 | $8.08 | $40.90K | 132,775 |
| Redmile Group, LLC Director | Jul 22, 2026 | Option exercise | +195,211 | – | – | 636,912 |
| Redmile Group, LLC Director | Jul 22, 2026 | Tax withholding | −60 | – | – | 636,852 |
| Brian N. Cherry Director | Jun 11, 2026 | Award | +24,000 | – | – | 62,320 |
| William K. Heiden Director | Jun 9, 2026 | Award | +12,000 | – | – | 34,188 |
| Matthew K. Fust Director | Jun 9, 2026 | Award | +12,000 | – | – | 30,188 |
| Gregory Austin Ciongoli Director, 10% owner | Jun 9, 2026 | Award | +12,000 | – | – | 12,000 |
| Yanina Grant-Huerta Chief Accounting Officer | May 18, 2026 | Sale | −2,414 | $9.13 | $22.04K | 49,636 |
| AnhCo Nguyen President and CEO, Director | May 18, 2026 | Sale | −5,241 | $9.13 | $47.85K | 137,837 |
| EcoR1 Capital, LLC 10% owner | May 7, 2026 | Buy | +507,407 | $9.35 | $4.74M | 1,552,000 |
| Innovation Ltd Panacea 10% owner | May 7, 2026 | Sale | −313,446 | $10.10 | $3.17M | 1,011,000 |
| Innovation Ltd Panacea 10% owner | Mar 17, 2026 | Tax withholding | −5 | $5.23 | $26 | 307,894 |
| Innovation Ltd Panacea 10% owner | Mar 17, 2026 | Option exercise | +259,163 | – | – | 307,899 |
| Yanina Grant-Huerta Chief Accounting Officer | Mar 9, 2026 | Award | +20,300 | – | – | 52,050 |
| AnhCo Nguyen President and CEO, Director | Mar 9, 2026 | Award | +81,100 | – | – | 143,078 |
| AnhCo Nguyen President and CEO, Director | Mar 2, 2026 | Sale | −1,442 | $5.09 | $7.34K | 61,978 |
| AnhCo Nguyen President and CEO, Director | Mar 2, 2026 | Sale | −198 | $5.08 | $1.01K | 64,776 |
| AnhCo Nguyen President and CEO, Director | Mar 2, 2026 | Sale | −1,298 | $5.09 | $6.61K | 63,420 |
| AnhCo Nguyen President and CEO, Director | Mar 2, 2026 | Sale | −58 | $5.08 | $295 | 64,718 |
| Yanina Grant-Huerta Chief Accounting Officer | Mar 2, 2026 | Sale | −100 | $5.08 | $508 | 31,750 |
| Yanina Grant-Huerta Chief Accounting Officer | Mar 2, 2026 | Sale | −24 | $5.08 | $122 | 33,830 |
| Yanina Grant-Huerta Chief Accounting Officer | Mar 2, 2026 | Sale | −1,603 | $5.08 | $8.14K | 32,227 |
| Yanina Grant-Huerta Chief Accounting Officer | Mar 2, 2026 | Sale | −377 | $5.08 | $1.92K | 31,850 |
| James Huang Director, 10% owner | Jan 12, 2026 | Sale | −80,554 | $6.07 | $488.96K | 1,324,446 |
| Innovation Ltd Panacea 10% owner | Nov 28, 2025 | Option exercise | +48,737 | – | – | 48,737 |
| Innovation Ltd Panacea 10% owner | Nov 28, 2025 | Tax withholding | −1 | $14.03 | $14 | 48,736 |
| AnhCo Nguyen President and CEO, Director | Nov 17, 2025 | Sale | −2,859 | $13.19 | $37.71K | 65,030 |
| AnhCo Nguyen President and CEO, Director | Nov 17, 2025 | Sale | −56 | $13.19 | $739 | 64,974 |
| Yanina Grant-Huerta Chief Accounting Officer | Nov 17, 2025 | Sale | −85 | $13.19 | $1.12K | 33,528 |
| Yanina Grant-Huerta Chief Accounting Officer | Nov 17, 2025 | Sale | −74 | $13.19 | $976 | 33,454 |
| Yanina Grant-Huerta Chief Accounting Officer | Nov 17, 2025 | Sale | −1,645 | $13.19 | $21.70K | 33,613 |
| Yanina Grant-Huerta Chief Accounting Officer | Aug 18, 2025 | Sale | −1,668 | $11.61 | $19.37K | 35,258 |
| Yanina Grant-Huerta Chief Accounting Officer | Aug 18, 2025 | Sale | −86 | $11.61 | $998 | 36,926 |
| Yanina Grant-Huerta Chief Accounting Officer | Aug 18, 2025 | Sale | −55 | $11.61 | $639 | 37,012 |
| AnhCo Nguyen President and CEO, Director | Aug 18, 2025 | Sale | −1,281 | $11.62 | $14.89K | 69,509 |
| AnhCo Nguyen President and CEO, Director | Aug 18, 2025 | Sale | −1,620 | $11.62 | $18.82K | 67,889 |
| AnhCo Nguyen President and CEO, Director | Aug 18, 2025 | Sale | −57 | $11.61 | $662 | 70,790 |
| Innovation Ltd Panacea 10% owner | Aug 15, 2025 | Buy | +55,000 | $12.19 | $670.45K | 1,405,000 |
| James Huang Director, 10% owner | Jul 17, 2025 | Buy | +19,335 | $9.64 | $186.39K | 1,350,000 |
| Carol Giltner Gallagher Director | Jun 10, 2025 | Award | +7,828 | – | – | 33,012 |
| Matthew K. Fust Director | Jun 10, 2025 | Award | +7,828 | – | – | 18,188 |
| William K. Heiden Director | Jun 10, 2025 | Award | +7,828 | – | – | 22,188 |
| Pascal Touchon Director | Jun 10, 2025 | Award | +7,828 | – | – | 77,955 |
| Maria Grazia Roncarolo Director | Jun 10, 2025 | Award | +7,828 | – | – | 17,368 |
| Ameet Mallik Director | Jun 10, 2025 | Award | +7,828 | – | – | 16,928 |
| Yanina Grant-Huerta Chief Accounting Officer | May 16, 2025 | Sale | −2,218 | $6.76 | $14.99K | 37,067 |
| AnhCo Nguyen President and CEO, Director | May 16, 2025 | Sale | −3,276 | $6.76 | $22.15K | 70,847 |
| Capital Fund I. GP LLC Adiumentum Director, 10% owner | May 16, 2025 | Award | +75,572 | $6.61 | $499.53K | 1,209,395 |
| AnhCo Nguyen President and CEO, Director | Mar 3, 2025 | Sale | −3,331 | $7.00 | $23.32K | 74,123 |
| Eric J. Hyllengren EVP, CFO and COO | Mar 3, 2025 | Sale | −1,211 | $7.00 | $8.48K | 56,231 |
| Jill Henrich EVP, Chief Regulatory Officer | Mar 3, 2025 | Sale | −1,059 | $7.00 | $7.41K | 18,679 |
| Eric J. Hyllengren EVP, CFO and COO | Jan 27, 2025 | Award | +34,050 | – | – | 57,442 |
| AnhCo Nguyen President and CEO, Director | Nov 18, 2024 | Sale | −1,664 | $11.20 | $18.64K | 77,454 |
| Eric J. Hyllengren EVP, CFO and COO | Nov 18, 2024 | Sale | −1,364 | $11.20 | $15.28K | 23,392 |
| Jill Henrich EVP, Chief Regulatory Officer | Nov 18, 2024 | Sale | −1,000 | $11.20 | $11.20K | 19,378 |
| AnhCo Nguyen President and CEO, Director | Sep 9, 2024 | Award | +45,000 | – | – | 79,118 |
| Eric J. Hyllengren EVP, CFO | Aug 16, 2024 | Sale | −1,041 | $6.63 | $6.90K | 24,785 |
| Eric J. Hyllengren EVP, CFO | Aug 16, 2024 | Sale | −29 | $6.63 | $192 | 24,756 |
| AnhCo Nguyen EVP, Chief Sci. & Tech Officer | Aug 16, 2024 | Sale | −56 | $6.63 | $371 | 34,118 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| AnhCo Nguyen Director, Officer | Aug 26, 2026 | 5,062 | $42.32K | Aug 17, 2026 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| AnhCo Nguyen Director, Officer | May 18, 2026 | 5,981 | $62.68K | May 18, 2026 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| Yanina Grant-Huerta Officer | May 18, 2026 | 2,754 | $28.86K | May 18, 2026 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| Innovation Ltd Panacea 10% Stockholder | May 7, 2026 | 313,446 | $3.17M | May 7, 2026 | The Common Stock was purchased in multiple open market transactions from January 2025 through August 2025 as well as a registered direct financing in May 2025. |
| Yanina Grant-Huerta Officer | Mar 2, 2026 | 2,355 | $12.76K | Mar 2, 2026 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| AnhCo Nguyen Director, Officer | Mar 2, 2026 | 3,355 | $18.18K | Mar 2, 2026 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| Innovation Ltd Panacea 10% Stockholder | Jan 12, 2026 | 80,554 | $473.66K | Jan 12, 2026 | The Common Stock was purchased in multiple open market transactions from January 2025 through August 2025 as well as a registered direct financing in May 2025. |
| Yanina Grant-Huerta Officer | Nov 17, 2025 | 2,069 | $28.47K | Nov 17, 2025 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| AnhCo Nguyen Director, Officer | Nov 17, 2025 | 3,346 | $46.04K | Nov 17, 2025 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| AnhCo Nguyen Director, Officer | Aug 18, 2025 | 3,346 | $41.12K | Aug 18, 2025 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| Yanina Grant-Huerta Officer | Aug 18, 2025 | 2,048 | $25.17K | Aug 18, 2025 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| Yanina Grant-Huerta Officer | May 16, 2025 | 2,350 | $17.88K | May 16, 2025 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| AnhCo Nguyen Director, Officer | May 16, 2025 | 3,471 | $26.41K | May 16, 2025 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| Eric J. Hyllengren Officer | Mar 3, 2025 | 1,426 | $9.85K | Mar 3, 2025 | Settlement of vested RSUs issued under an S-8 Registration Plan |
| Jill Henrich Officer | Mar 3, 2025 | 1,245 | $8.60K | Mar 3, 2025 | Settlement of vested RSUs issued under an S-8 Registration Plan |