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Atara Biotherapeutics Inc (ATRA)

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Insider transactions

A complete record of Form 4 filings tracking every share acquisition and disposal by executives, directors, and senior officers. Filterable by date range and transaction type, the table exposes the direct market actions of those with the deepest knowledge of a company's operations — providing a factual, data-driven signal of internal conviction that complements traditional fundamental and technical analysis.

Transaction date
Executive
Executive Title
Security Type
Acquisition / Disposal
Shares
Share price
Sep 4, 2026CHERRY, BRIAN NDirectorCommon StockAcquisition104,1669.6
Aug 17, 2026NGUYEN, ANHCODirector, President and CEOCommon StockDisposal5,0628.076
Jul 22, 2026REDMILE, GROUP, LLCDirectorPre-Funded Warrants to Purchase Common StockDisposal101,0890
Jul 22, 2026REDMILE, GROUP, LLCDirectorCommon StockDisposal60
Jul 22, 2026REDMILE, GROUP, LLCDirectorCommon StockAcquisition195,211
Jul 22, 2026REDMILE, GROUP, LLCDirectorPre-Funded Warrants to Purchase Common StockDisposal55,3870
Jul 22, 2026REDMILE, GROUP, LLCDirectorPre-Funded Warrants to Purchase Common StockDisposal38,7350
Jun 11, 2026CHERRY, BRIAN NDirectorCommon StockAcquisition24,0000
Jun 9, 2026CIONGOLI, GREGORY AUSTINDirector, 10% Owner, See RemarksCommon StockAcquisition12,0000
Jun 9, 2026FUST, MATTHEW KDirectorCommon StockAcquisition12,0000
Jun 9, 2026HEIDEN, WILLIAM KDirectorCommon StockAcquisition12,0000
May 18, 2026NGUYEN, ANHCODirector, President and CEOCommon StockDisposal5,2419.129
May 18, 2026GRANT-HUERTA, YANINAChief Accounting OfficerCommon StockDisposal2,4149.129
May 7, 2026PANACEA, INNOVATION LTD10% OwnerCommon StockDisposal313,44610.098
May 7, 2026ECOR1, CAPITAL, LLC10% OwnerCommon StockAcquisition507,4079.35
Mar 17, 2026PANACEA, INNOVATION LTD10% OwnerCommon StockDisposal55.23
Mar 17, 2026PANACEA, INNOVATION LTD10% OwnerCommon StockAcquisition259,1630
Mar 17, 2026PANACEA, INNOVATION LTD10% OwnerWarrantsDisposal259,1636.61
Mar 9, 2026NGUYEN, ANHCODirector, President and CEOCommon StockAcquisition81,1000
Mar 9, 2026GRANT-HUERTA, YANINAChief Accounting OfficerCommon StockAcquisition20,3000
Mar 2, 2026GRANT-HUERTA, YANINAChief Accounting OfficerCommon StockDisposal1,6035.081
Mar 2, 2026GRANT-HUERTA, YANINAChief Accounting OfficerCommon StockDisposal3775.082
Mar 2, 2026NGUYEN, ANHCODirector, President and CEOCommon StockDisposal585.08
Mar 2, 2026GRANT-HUERTA, YANINAChief Accounting OfficerCommon StockDisposal245.077
Mar 2, 2026NGUYEN, ANHCODirector, President and CEOCommon StockDisposal1985.079
Mar 2, 2026GRANT-HUERTA, YANINAChief Accounting OfficerCommon StockDisposal1005.083
Mar 2, 2026NGUYEN, ANHCODirector, President and CEOCommon StockDisposal1,4425.087
Mar 2, 2026NGUYEN, ANHCODirector, President and CEOCommon StockDisposal1,2985.086
Jan 12, 2026PANACEA, INNOVATION LTD10% OwnerCommon StockDisposal80,5546.071
Nov 28, 2025PANACEA, INNOVATION LTD10% OwnerWarrantsDisposal48,7376.61
Nov 28, 2025PANACEA, INNOVATION LTD10% OwnerCommon StockDisposal114.03
Nov 28, 2025PANACEA, INNOVATION LTD10% OwnerCommon StockAcquisition48,7370
Nov 17, 2025NGUYEN, ANHCODirector, President and CEOCommon StockDisposal5613.188
Nov 17, 2025GRANT-HUERTA, YANINAChief Accounting OfficerCommon StockDisposal1,64513.186
Nov 17, 2025NGUYEN, ANHCODirector, President and CEOCommon StockDisposal2,85913.186
Nov 17, 2025GRANT-HUERTA, YANINAChief Accounting OfficerCommon StockDisposal8513.188
Nov 17, 2025GRANT-HUERTA, YANINAChief Accounting OfficerCommon StockDisposal7413.191