Atara Biotherapeutics, Inc.
ATRA- Exchange
- Nasdaq
- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0001604464
In the last 90 days, Atara Biotherapeutics, Inc. insiders filed 1 open-market purchase and 1 sale; 36 institutions reported holding it in 13F filings for Q2 2026, worth $51.3M in total; no superinvestor holds it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Atara Biotherapeutics, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 1 filing
- 1 insider, $1.00M in total
- Open-market sells
- 1 filing
- 1 insider, $40.9K in total
- Insiders trading
- 2
- Net value
- +$959.1K
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Atara Biotherapeutics, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Cherry Brian N | Director | 166,486 | Sep 4, 2026 | 2 |
| Nguyen AnhCo | President and CEO | 132,775 | Aug 26, 2026 | 5 |
| Redmile Group, LLC | Director | 636,852Indirect | Jul 24, 2026 | 1 |
| Green Jeremy | Director | 636,852Indirect | Jul 24, 2026 | 1 |
| Heiden William K | Director | 34,188 | Jun 11, 2026 | 1 |
| Fust Matthew K | Director | 30,188 | Jun 11, 2026 | 1 |
| Ciongoli Gregory Austin | Director, 10% Owner, Other: See Remarks | 12,000 | Jun 11, 2026 | 1 |
| Grant-Huerta Yanina | Chief Accounting Officer | 49,636 | May 20, 2026 | 4 |
| Huang James | Director, 10% Owner | 1,011,000Indirect | May 11, 2026 | 4 |
| Panacea Innovation Ltd | 10% Owner | 1,011,000Indirect | May 11, 2026 | 4 |
| EcoR1 Capital, LLC | 10% Owner | 1,552,000Indirect | May 11, 2026 | 1 |
| Gallagher Carol Giltner | Director | 33,012 | Jun 12, 2025 | 0 |
| Touchon Pascal | Director | 77,955 | Jun 12, 2025 | 0 |
| Roncarolo Maria Grazia | Director | 17,368 | Jun 12, 2025 | 0 |
| Mallik Ameet | Director | 16,928 | Jun 12, 2025 | 0 |
| Adiumentum Capital Fund I LP | Director, 10% Owner, Other: See remarks | 1,209,395 | May 16, 2025 | 0 |
| Adiumentum Capital Fund I GP LLC | Director, 10% Owner, Other: See remarks | 1,209,395 | May 16, 2025 | 0 |
| Hyllengren Eric J | Other: Former EVP, CFO & COO | 56,231 | Apr 2, 2025 | 0 |
| Henrich Jill | EVP, Chief Regulatory Officer | 18,679 | Mar 5, 2025 | 0 |
| Murugan Amar | EVP, Chief Legal Officer | 26,827 | Aug 20, 2024 | 0 |
| Joshi Manher | EVP, Chief Medical Officer | 171,284 | Nov 20, 2023 | 0 |
| Dobmeier Eric | Director | 563,325 | Nov 14, 2023 | 0 |
| Seidenberg Beth C | Director | 115,689 | Jun 2, 2023 | 0 |
| Banard Charlene A. | EVP, Chief Technical Officer | 276,010 | May 18, 2023 | 0 |
| Dupont Jakob | EVP, Head of R&D | 290,794 | Mar 6, 2023 | 0 |
| Koppikar Utpal | Chief Financial Officer | 181,978 | Mar 6, 2023 | 0 |
| Renaud Ronald C JR | Director | 31,500 | Jun 27, 2022 | 0 |
| Baynes Roy D. | Director | 43,500 | Jun 27, 2022 | 0 |
| Yarema Kristin | Chief Commercial Officer | 171,415 | Mar 3, 2022 | 0 |
| Newell Joe | Chief Operations Officer | 113,097 | Nov 18, 2021 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Sep 4, 2026 (view filing)6:20 PM ET | Sep 4 | Same day | Cherry Brian NDirector | PPurchase | +104.2K | $9.60 | +$1.00M | +167.1%166.5K after | |
| Aug 26, 2026 (view filing)7:45 PM ET | Aug 17 | 9 daysLate | Nguyen AnhCoPresident and CEO | SSale | −5.06K | $8.08 | −$40.9K | −3.7%132.8K after | |
| May 20, 2026 (view filing) | May 18 | 2 days | Nguyen AnhCoPresident and CEO | SSale | −5.24K | $9.13 | −$47.9K | −3.7%137.8K after | |
| May 20, 2026 (view filing) | May 18 | 2 days | Grant-Huerta YaninaChief Accounting Officer | SSale | −2.41K | $9.13 | −$22.0K | −4.6%49.6K after | |
| May 11, 2026 (view filing)6:45 PM ET | May 7 | 4 days | Huang James and 1 otherDirector, 10% Owner | SSale | −313.4K | $10.10 | −$3.17M | −23.7%1.01M after | |
| May 11, 2026 (view filing) | May 7 | 4 days | EcoR1 Capital, LLC10% Owner | PPurchase | +507.4K | $9.35 | +$4.74M | +48.6%1.55M after | |
| Mar 4, 2026 (view filing) | Mar 2 | 2 days | Grant-Huerta YaninaChief Accounting Officer | SSale | −2.10K | $5.08 | −$10.7K | −6.2%31.8K after | 4 lots |
| Mar 4, 2026 (view filing) | Mar 2 | 2 days | Nguyen AnhCoPresident and CEO | SSale | −3.00K | $5.09 | −$15.2K | −4.6%62.0K after | 4 lots |
| Jan 14, 2026 (view filing)9:16 PM ET | Jan 12 | 2 days | Huang James and 1 otherDirector, 10% Owner | SSale | −80.6K | $6.07 | −$489.0K | −5.7%1.32M after | |
| Nov 19, 2025 (view filing) | Nov 17 | 2 days | Nguyen AnhCoPresident and CEO | SSale | −2.92K | $13.19 | −$38.4K | −4.3%65.0K after | 2 lots |
| Nov 19, 2025 (view filing) | Nov 17 | 2 days | Grant-Huerta YaninaChief Accounting Officer | SSale | −1.80K | $13.19 | −$23.8K | −5.1%33.5K after | 3 lots |
| Aug 20, 2025 (view filing) | Aug 18 | 2 days | Nguyen AnhCoPresident and CEO | SSale | −2.96K | $11.62 | −$34.4K | −4.2%67.9K after | 3 lots |
| Aug 20, 2025 (view filing) | Aug 18 | 2 days | Grant-Huerta YaninaChief Accounting Officer | SSale | −1.81K | $11.61 | −$21.0K | −4.9%35.3K after | 3 lots |
| Aug 19, 2025 (view filing)8:15 PM ET | Aug 15 | 4 days | Huang James and 1 otherDirector, 10% Owner | PPurchase | +55.0K | $12.19 | +$670.4K | +4.1%1.41M after | |
| Jul 21, 2025 (view filing)9:00 AM ET | Jul 17 | 4 days | Huang James and 1 otherDirector, 10% Owner | PPurchase | +19.3K | $9.64 | +$186.4K | +1.5%1.35M after | |
| May 20, 2025 (view filing) | May 16 | 4 days | Grant-Huerta YaninaChief Accounting Officer | SSale | −2.22K | $6.76 | −$15.0K | −5.6%37.1K after | |
| May 20, 2025 (view filing) | May 16 | 4 days | Nguyen AnhCoPresident and CEO | SSale | −3.28K | $6.76 | −$22.1K | −4.4%70.8K after | |
| Mar 5, 2025 (view filing) | Mar 3 | 2 days | Nguyen AnhCoPresident and CEO | SSale | −3.33K | $7.00 | −$23.3K | −4.3%74.1K after | |
| Mar 5, 2025 (view filing) | Mar 3 | 2 days | Hyllengren Eric JEVP, CFO and COO | SSale | −1.21K | $7.00 | −$8.48K | −2.1%56.2K after | |
| Mar 5, 2025 (view filing) | Mar 3 | 2 days | Henrich JillEVP, Chief Regulatory Officer | SSale | −1.06K | $7.00 | −$7.41K | −5.4%18.7K after | |
| Nov 20, 2024 (view filing) | Nov 18 | 2 days | Henrich JillEVP, Chief Regulatory Officer | SSale | −1.00K | $11.20 | −$11.2K | −4.9%19.4K after | |
| Nov 20, 2024 (view filing) | Nov 18 | 2 days | Hyllengren Eric JEVP, CFO and COO | SSale | −1.36K | $11.20 | −$15.3K | −5.5%23.4K after | |
| Nov 20, 2024 (view filing) | Nov 18 | 2 days | Nguyen AnhCoPresident and CEO | SSale | −1.66K | $11.20 | −$18.6K | −2.1%77.5K after | |
| Aug 20, 2024 (view filing) | Aug 16 | 4 days | Touchon PascalPresident and CEO | SSale | −3.04K | $6.63 | −$20.1K | −4.2%70.1K after | 2 lots |
| Aug 20, 2024 (view filing) | Aug 16 | 4 days | Nguyen AnhCoEVP, Chief Sci. & Tech Officer | SSale | −1.82K | $6.63 | −$12.1K | −5.1%34.1K after | 3 lots |
| Aug 20, 2024 (view filing) | Aug 16 | 4 days | Murugan AmarEVP, Chief Legal Officer | SSale | −1.16K | $6.63 | −$7.68K | −4.1%26.8K after | 3 lots |
| Aug 20, 2024 (view filing) | Aug 16 | 4 days | Hyllengren Eric JEVP, CFO | SSale | −1.07K | $6.63 | −$7.09K | −4.1%24.8K after | 2 lots |
| Aug 20, 2024 (view filing) | Aug 16 | 4 days | Henrich JillEVP, Global Head RA & Quality | SSale | −963 | $6.63 | −$6.38K | −4.5%20.4K after | 2 lots |
| May 20, 2024 (view filing) | May 16 | 4 days | Touchon PascalPresident and CEO | SSale | −81.5K | $0.62 | −$50.5K | −4.3%1.83M after | |
| May 20, 2024 (view filing) | May 16 | 4 days | Nguyen AnhCoEVP, Chief Sci. & Tech Officer | SSale | −42.9K | $0.62 | −$26.6K | −4.6%898.5K after | |
| May 20, 2024 (view filing) | May 16 | 4 days | Murugan AmarEVP, Chief Legal Officer | SSale | −32.4K | $0.62 | −$20.1K | −4.5%695.1K after | |
| May 20, 2024 (view filing) | May 16 | 4 days | Hyllengren Eric JEVP, CFO | SSale | −28.6K | $0.62 | −$17.8K | −4.2%645.7K after | |
| May 20, 2024 (view filing) | May 16 | 4 days | Henrich JillEVP, Global Head RA & Quality | SSale | −25.8K | $0.62 | −$16.0K | −4.6%529.3K after | |
| Mar 6, 2024 (view filing) | Mar 4 | 2 days | Touchon PascalPresident and CEO | SSale | −24.8K | $0.72 | −$17.9K | −1.3%1.91M after | |
| Mar 6, 2024 (view filing) | Mar 4 | 2 days | Nguyen AnhCoEVP, Chief Sci. & Tech Officer | SSale | −10.7K | $0.72 | −$7.74K | −1.1%941.4K after | |
| Mar 6, 2024 (view filing) | Mar 4 | 2 days | Murugan AmarEVP, Chief Legal Officer | SSale | −10.0K | $0.72 | −$7.23K | −1.4%727.5K after | |
| Mar 6, 2024 (view filing) | Mar 4 | 2 days | Hyllengren Eric JEVP, CFO | SSale | −6.68K | $0.72 | −$4.81K | −1.0%674.3K after | 2 lots |
| Mar 6, 2024 (view filing) | Mar 4 | 2 days | Henrich JillEVP, Global Head RA & Quality | SSale | −3.88K | $0.72 | −$2.79K | −0.7%555.0K after | |
| Nov 20, 2023 (view filing)5:31 PM ET | Nov 16 | 4 days | Touchon PascalPresident and CEO | SSale | −20.4K | $0.389 | −$7.94K | −3.0%655.5K after | |
| Nov 20, 2023 (view filing)5:31 PM ET | Nov 16 | 4 days | Nguyen AnhCoEVP, Chief Sci. & Tech Officer | SSale | −8.86K | $0.389 | −$3.44K | −3.1%277.1K after | |
| Nov 20, 2023 (view filing)5:30 PM ET | Nov 16 | 4 days | Murugan AmarEVP, Chief Legal Officer | SSale | −8.31K | $0.389 | −$3.23K | −3.1%257.1K after | |
| Nov 20, 2023 (view filing)5:30 PM ET | Nov 16 | 4 days | Joshi ManherEVP, Chief Medical Officer | SSale | −12.3K | $0.389 | −$4.78K | −6.7%171.3K after | |
| Nov 20, 2023 (view filing)5:29 PM ET | Nov 16 | 4 days | Hyllengren Eric JSVP, CFO | SSale | −12.0K | $0.389 | −$4.65K | −5.5%206.0K after | |
| Nov 20, 2023 (view filing)5:29 PM ET | Nov 16 | 4 days | Henrich JillEVP, Global Head RA & Quality | SSale | −3.27K | $0.389 | −$1.27K | −3.0%104.4K after | |
| Nov 15, 2023 (view filing)5:07 PM ET | Nov 13-14 | 2 days | Gallagher Carol GiltnerDirector | PPurchase | +270.0K | $0.2526 | +$68.2K | +142.5%459.4K after | 2 lots |
| Nov 14, 2023 (view filing)6:29 PM ET | Nov 10 | 4 days | Heiden William KDirector | PPurchase | +100.0K | $0.2533 | +$25.3K | +91.7%209.0K after | |
| Nov 14, 2023 (view filing)6:27 PM ET | Nov 10 | 4 days | Dobmeier EricDirector | PPurchase | +446.8K | $0.2268 | +$101.3K | +383.5%563.3K after | |
| Aug 18, 2023 (view filing) | Aug 16 | 2 days | Hyllengren Eric JSVP, CFO | SSale | −8.19K | $1.65 | −$13.5K | −3.6%218.0K after | 2 lots |
| Aug 18, 2023 (view filing) | Aug 16 | 2 days | Murugan AmarEVP, Chief Legal Officer | SSale | −8.67K | $1.65 | −$14.3K | −3.2%265.4K after | 2 lots |
| Aug 18, 2023 (view filing) | Aug 16 | 2 days | Touchon PascalPresident and CEO | SSale | −30.8K | $1.65 | −$50.8K | −4.4%675.9K after | 2 lots |