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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.

Insider roster for Atara Biotherapeutics, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Cherry Brian NDirector166,486Sep 4, 20262
Nguyen AnhCoPresident and CEO132,775Aug 26, 20265
Redmile Group, LLCDirector636,852IndirectJul 24, 20261
Green JeremyDirector636,852IndirectJul 24, 20261
Heiden William KDirector34,188Jun 11, 20261
Fust Matthew KDirector30,188Jun 11, 20261
Ciongoli Gregory AustinDirector, 10% Owner, Other: See Remarks12,000Jun 11, 20261
Grant-Huerta YaninaChief Accounting Officer49,636May 20, 20264
Huang JamesDirector, 10% Owner1,011,000IndirectMay 11, 20264
Panacea Innovation Ltd10% Owner1,011,000IndirectMay 11, 20264
EcoR1 Capital, LLC10% Owner1,552,000IndirectMay 11, 20261
Gallagher Carol GiltnerDirector33,012Jun 12, 20250
Touchon PascalDirector77,955Jun 12, 20250
Roncarolo Maria GraziaDirector17,368Jun 12, 20250
Mallik AmeetDirector16,928Jun 12, 20250
Adiumentum Capital Fund I LPDirector, 10% Owner, Other: See remarks1,209,395May 16, 20250
Adiumentum Capital Fund I GP LLCDirector, 10% Owner, Other: See remarks1,209,395May 16, 20250
Hyllengren Eric JOther: Former EVP, CFO & COO56,231Apr 2, 20250
Henrich JillEVP, Chief Regulatory Officer18,679Mar 5, 20250
Murugan AmarEVP, Chief Legal Officer26,827Aug 20, 20240
Joshi ManherEVP, Chief Medical Officer171,284Nov 20, 20230
Dobmeier EricDirector563,325Nov 14, 20230
Seidenberg Beth CDirector115,689Jun 2, 20230
Banard Charlene A.EVP, Chief Technical Officer276,010May 18, 20230
Dupont JakobEVP, Head of R&D290,794Mar 6, 20230
Koppikar UtpalChief Financial Officer181,978Mar 6, 20230
Renaud Ronald C JRDirector31,500Jun 27, 20220
Baynes Roy D.Director43,500Jun 27, 20220
Yarema KristinChief Commercial Officer171,415Mar 3, 20220
Newell JoeChief Operations Officer113,097Nov 18, 20210

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.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Sep 4, 2026 (view filing)6:20 PM ETSep 4Same dayCherry Brian NDirectorPPurchase+104.2K$9.60+$1.00M+167.1%166.5K after
Aug 26, 2026 (view filing)7:45 PM ETAug 179 daysLateNguyen AnhCoPresident and CEOSSale−5.06K$8.08−$40.9K−3.7%132.8K after
May 20, 2026 (view filing)May 182 daysNguyen AnhCoPresident and CEOSSale−5.24K$9.13−$47.9K−3.7%137.8K after
May 20, 2026 (view filing)May 182 daysGrant-Huerta YaninaChief Accounting OfficerSSale−2.41K$9.13−$22.0K−4.6%49.6K after
May 11, 2026 (view filing)6:45 PM ETMay 74 daysHuang James and 1 otherDirector, 10% OwnerSSale−313.4K$10.10−$3.17M−23.7%1.01M after
May 11, 2026 (view filing)May 74 daysEcoR1 Capital, LLC10% OwnerPPurchase+507.4K$9.35+$4.74M+48.6%1.55M after
Mar 4, 2026 (view filing)Mar 22 daysGrant-Huerta YaninaChief Accounting OfficerSSale−2.10K$5.08−$10.7K−6.2%31.8K after4 lots
Mar 4, 2026 (view filing)Mar 22 daysNguyen AnhCoPresident and CEOSSale−3.00K$5.09−$15.2K−4.6%62.0K after4 lots
Jan 14, 2026 (view filing)9:16 PM ETJan 122 daysHuang James and 1 otherDirector, 10% OwnerSSale−80.6K$6.07−$489.0K−5.7%1.32M after
Nov 19, 2025 (view filing)Nov 172 daysNguyen AnhCoPresident and CEOSSale−2.92K$13.19−$38.4K−4.3%65.0K after2 lots
Nov 19, 2025 (view filing)Nov 172 daysGrant-Huerta YaninaChief Accounting OfficerSSale−1.80K$13.19−$23.8K−5.1%33.5K after3 lots
Aug 20, 2025 (view filing)Aug 182 daysNguyen AnhCoPresident and CEOSSale−2.96K$11.62−$34.4K−4.2%67.9K after3 lots
Aug 20, 2025 (view filing)Aug 182 daysGrant-Huerta YaninaChief Accounting OfficerSSale−1.81K$11.61−$21.0K−4.9%35.3K after3 lots
Aug 19, 2025 (view filing)8:15 PM ETAug 154 daysHuang James and 1 otherDirector, 10% OwnerPPurchase+55.0K$12.19+$670.4K+4.1%1.41M after
Jul 21, 2025 (view filing)9:00 AM ETJul 174 daysHuang James and 1 otherDirector, 10% OwnerPPurchase+19.3K$9.64+$186.4K+1.5%1.35M after
May 20, 2025 (view filing)May 164 daysGrant-Huerta YaninaChief Accounting OfficerSSale−2.22K$6.76−$15.0K−5.6%37.1K after
May 20, 2025 (view filing)May 164 daysNguyen AnhCoPresident and CEOSSale−3.28K$6.76−$22.1K−4.4%70.8K after
Mar 5, 2025 (view filing)Mar 32 daysNguyen AnhCoPresident and CEOSSale−3.33K$7.00−$23.3K−4.3%74.1K after
Mar 5, 2025 (view filing)Mar 32 daysHyllengren Eric JEVP, CFO and COOSSale−1.21K$7.00−$8.48K−2.1%56.2K after
Mar 5, 2025 (view filing)Mar 32 daysHenrich JillEVP, Chief Regulatory OfficerSSale−1.06K$7.00−$7.41K−5.4%18.7K after
Nov 20, 2024 (view filing)Nov 182 daysHenrich JillEVP, Chief Regulatory OfficerSSale−1.00K$11.20−$11.2K−4.9%19.4K after
Nov 20, 2024 (view filing)Nov 182 daysHyllengren Eric JEVP, CFO and COOSSale−1.36K$11.20−$15.3K−5.5%23.4K after
Nov 20, 2024 (view filing)Nov 182 daysNguyen AnhCoPresident and CEOSSale−1.66K$11.20−$18.6K−2.1%77.5K after
Aug 20, 2024 (view filing)Aug 164 daysTouchon PascalPresident and CEOSSale−3.04K$6.63−$20.1K−4.2%70.1K after2 lots
Aug 20, 2024 (view filing)Aug 164 daysNguyen AnhCoEVP, Chief Sci. & Tech OfficerSSale−1.82K$6.63−$12.1K−5.1%34.1K after3 lots
Aug 20, 2024 (view filing)Aug 164 daysMurugan AmarEVP, Chief Legal OfficerSSale−1.16K$6.63−$7.68K−4.1%26.8K after3 lots
Aug 20, 2024 (view filing)Aug 164 daysHyllengren Eric JEVP, CFOSSale−1.07K$6.63−$7.09K−4.1%24.8K after2 lots
Aug 20, 2024 (view filing)Aug 164 daysHenrich JillEVP, Global Head RA & QualitySSale−963$6.63−$6.38K−4.5%20.4K after2 lots
May 20, 2024 (view filing)May 164 daysTouchon PascalPresident and CEOSSale−81.5K$0.62−$50.5K−4.3%1.83M after
May 20, 2024 (view filing)May 164 daysNguyen AnhCoEVP, Chief Sci. & Tech OfficerSSale−42.9K$0.62−$26.6K−4.6%898.5K after
May 20, 2024 (view filing)May 164 daysMurugan AmarEVP, Chief Legal OfficerSSale−32.4K$0.62−$20.1K−4.5%695.1K after
May 20, 2024 (view filing)May 164 daysHyllengren Eric JEVP, CFOSSale−28.6K$0.62−$17.8K−4.2%645.7K after
May 20, 2024 (view filing)May 164 daysHenrich JillEVP, Global Head RA & QualitySSale−25.8K$0.62−$16.0K−4.6%529.3K after
Mar 6, 2024 (view filing)Mar 42 daysTouchon PascalPresident and CEOSSale−24.8K$0.72−$17.9K−1.3%1.91M after
Mar 6, 2024 (view filing)Mar 42 daysNguyen AnhCoEVP, Chief Sci. & Tech OfficerSSale−10.7K$0.72−$7.74K−1.1%941.4K after
Mar 6, 2024 (view filing)Mar 42 daysMurugan AmarEVP, Chief Legal OfficerSSale−10.0K$0.72−$7.23K−1.4%727.5K after
Mar 6, 2024 (view filing)Mar 42 daysHyllengren Eric JEVP, CFOSSale−6.68K$0.72−$4.81K−1.0%674.3K after2 lots
Mar 6, 2024 (view filing)Mar 42 daysHenrich JillEVP, Global Head RA & QualitySSale−3.88K$0.72−$2.79K−0.7%555.0K after
Nov 20, 2023 (view filing)5:31 PM ETNov 164 daysTouchon PascalPresident and CEOSSale−20.4K$0.389−$7.94K−3.0%655.5K after
Nov 20, 2023 (view filing)5:31 PM ETNov 164 daysNguyen AnhCoEVP, Chief Sci. & Tech OfficerSSale−8.86K$0.389−$3.44K−3.1%277.1K after
Nov 20, 2023 (view filing)5:30 PM ETNov 164 daysMurugan AmarEVP, Chief Legal OfficerSSale−8.31K$0.389−$3.23K−3.1%257.1K after
Nov 20, 2023 (view filing)5:30 PM ETNov 164 daysJoshi ManherEVP, Chief Medical OfficerSSale−12.3K$0.389−$4.78K−6.7%171.3K after
Nov 20, 2023 (view filing)5:29 PM ETNov 164 daysHyllengren Eric JSVP, CFOSSale−12.0K$0.389−$4.65K−5.5%206.0K after
Nov 20, 2023 (view filing)5:29 PM ETNov 164 daysHenrich JillEVP, Global Head RA & QualitySSale−3.27K$0.389−$1.27K−3.0%104.4K after
Nov 15, 2023 (view filing)5:07 PM ETNov 13-142 daysGallagher Carol GiltnerDirectorPPurchase+270.0K$0.2526+$68.2K+142.5%459.4K after2 lots
Nov 14, 2023 (view filing)6:29 PM ETNov 104 daysHeiden William KDirectorPPurchase+100.0K$0.2533+$25.3K+91.7%209.0K after
Nov 14, 2023 (view filing)6:27 PM ETNov 104 daysDobmeier EricDirectorPPurchase+446.8K$0.2268+$101.3K+383.5%563.3K after
Aug 18, 2023 (view filing)Aug 162 daysHyllengren Eric JSVP, CFOSSale−8.19K$1.65−$13.5K−3.6%218.0K after2 lots
Aug 18, 2023 (view filing)Aug 162 daysMurugan AmarEVP, Chief Legal OfficerSSale−8.67K$1.65−$14.3K−3.2%265.4K after2 lots
Aug 18, 2023 (view filing)Aug 162 daysTouchon PascalPresident and CEOSSale−30.8K$1.65−$50.8K−4.4%675.9K after2 lots