https://www.developersdigest.tech/markets/atra/filings Latest company filings for Atara Biotherapeutics, Inc. (ATRA) - annual reports, quarterly reports, major events, and insider trades, newest first. en Mon, 13 Jul 2026 08:12:02 GMT https://www.sec.gov/Archives/edgar/data/1604464/000090514826002571/xslF345X06/form4.xml 0000905148-26-002571 Wed, 20 May 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000090514826002570/xslF345X06/form4.xml 0000905148-26-002570 Wed, 20 May 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000090514826002507/xsl144X01/primary_doc.xml 0000905148-26-002507 Mon, 18 May 2026 12:00:00 GMT 144 https://www.sec.gov/Archives/edgar/data/1604464/000090514826002506/xsl144X01/primary_doc.xml 0000905148-26-002506 Mon, 18 May 2026 12:00:00 GMT 144 https://www.sec.gov/Archives/edgar/data/1604464/000110465926061506/xslSCHEDULE_13D_X02/primary_doc.xml 0001104659-26-061506 Thu, 14 May 2026 12:00:00 GMT SCHEDULE 13D/A https://www.sec.gov/Archives/edgar/data/1604464/000091957426002914/xslSCHEDULE_13G_X02/primary_doc.xml 0000919574-26-002914 Wed, 13 May 2026 12:00:00 GMT SCHEDULE 13G https://www.sec.gov/Archives/edgar/data/1604464/000119312526219518/atra-424-b5-2026_q2.htm 0001193125-26-219518 Tue, 12 May 2026 12:00:00 GMT 424B5 https://www.sec.gov/Archives/edgar/data/1604464/000119312526219482/atra-20260331.htm 0001193125-26-219482 Tue, 12 May 2026 12:00:00 GMT 10-Q https://www.sec.gov/Archives/edgar/data/1604464/000119312526219420/atra-20260512.htm 0001193125-26-219420 Tue, 12 May 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/1604464/000119312526217389/xslSCHEDULE_13D_X02/primary_doc.xml 0001193125-26-217389 Mon, 11 May 2026 12:00:00 GMT SCHEDULE 13D/A https://www.sec.gov/Archives/edgar/data/1604464/000119312526217380/xslF345X06/ownership.xml 0001193125-26-217380 Mon, 11 May 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000093583626000239/xslF345X06/ownership.xml 0000935836-26-000239 Mon, 11 May 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000093583626000238/xslF345X06/ownership.xml 0000935836-26-000238 Mon, 11 May 2026 12:00:00 GMT 3 https://www.sec.gov/Archives/edgar/data/1604464/000091957426002802/xslSCHEDULE_13G_X02/primary_doc.xml 0000919574-26-002802 Fri, 08 May 2026 12:00:00 GMT SCHEDULE 13G https://www.sec.gov/Archives/edgar/data/1604464/000119312526212781/xsl144X01/primary_doc.xml 0001193125-26-212781 Thu, 07 May 2026 12:00:00 GMT 144 https://www.sec.gov/Archives/edgar/data/1604464/000119312526210413/atra-20260507.htm 0001193125-26-210413 Thu, 07 May 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/1604464/000093583626000230/xslSCHEDULE_13G_X02/primary_doc.xml 0000935836-26-000230 Thu, 07 May 2026 12:00:00 GMT SCHEDULE 13G/A https://www.sec.gov/Archives/edgar/data/1604464/000119312526201397/atra-20260430.htm 0001193125-26-201397 Fri, 01 May 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/1604464/000119312526177285/atra-20260424.htm 0001193125-26-177285 Fri, 24 Apr 2026 12:00:00 GMT DEF 14A https://www.sec.gov/Archives/edgar/data/1604464/000119312526177280/atra-2026-defa14a.htm 0001193125-26-177280 Fri, 24 Apr 2026 12:00:00 GMT DEFA14A https://www.sec.gov/Archives/edgar/data/1604464/999999999526000930/xslEFFECTX01/primary_doc.xml 9999999995-26-000930 Wed, 25 Mar 2026 12:00:00 GMT EFFECT https://www.sec.gov/Archives/edgar/data/1604464/000119312526124322/d100379d424b3.htm 0001193125-26-124322 Wed, 25 Mar 2026 12:00:00 GMT 424B3 https://www.sec.gov/Archives/edgar/data/1604464/000119312526119715/filename1.htm 0001193125-26-119715 Mon, 23 Mar 2026 12:00:00 GMT CORRESP https://www.sec.gov/Archives/edgar/data/1604464/000000000026002840/filename1.pdf 0000000000-26-002840 Fri, 20 Mar 2026 12:00:00 GMT UPLOAD https://www.sec.gov/Archives/edgar/data/1604464/000119312526116060/xslF345X06/ownership.xml 0001193125-26-116060 Thu, 19 Mar 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000119312526110849/d100379ds3.htm 0001193125-26-110849 Tue, 17 Mar 2026 12:00:00 GMT S-3 https://www.sec.gov/Archives/edgar/data/1604464/000119312526108386/atra-424-b5-2026_q1.htm 0001193125-26-108386 Mon, 16 Mar 2026 12:00:00 GMT 424B5 https://www.sec.gov/Archives/edgar/data/1604464/000119312526108361/atra-20251231.htm 0001193125-26-108361 Mon, 16 Mar 2026 12:00:00 GMT 10-K https://www.sec.gov/Archives/edgar/data/1604464/000119312526108344/atra-20260316.htm 0001193125-26-108344 Mon, 16 Mar 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/1604464/000119312526103127/atra-20260312.htm 0001193125-26-103127 Thu, 12 Mar 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/1604464/000090514826001225/xslF345X05/form4.xml 0000905148-26-001225 Wed, 11 Mar 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000090514826001224/xslF345X05/form4.xml 0000905148-26-001224 Wed, 11 Mar 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000090514826001144/xslF345X05/form4.xml 0000905148-26-001144 Wed, 04 Mar 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000090514826001143/xslF345X05/form4.xml 0000905148-26-001143 Wed, 04 Mar 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000119312526086793/d121575d8k.htm 0001193125-26-086793 Tue, 03 Mar 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/1604464/000090514826001102/xsl144X01/primary_doc.xml 0000905148-26-001102 Mon, 02 Mar 2026 12:00:00 GMT 144 https://www.sec.gov/Archives/edgar/data/1604464/000090514826001100/xsl144X01/primary_doc.xml 0000905148-26-001100 Mon, 02 Mar 2026 12:00:00 GMT 144 https://www.sec.gov/Archives/edgar/data/1604464/000119312526062534/d105335d8k.htm 0001193125-26-062534 Mon, 23 Feb 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/1604464/000119312526013362/xslSCHEDULE_13D_X01/primary_doc.xml 0001193125-26-013362 Wed, 14 Jan 2026 12:00:00 GMT SCHEDULE 13D/A https://www.sec.gov/Archives/edgar/data/1604464/000119312526013358/xslF345X05/ownership.xml 0001193125-26-013358 Wed, 14 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000119312526010883/xsl144X01/primary_doc.xml 0001193125-26-010883 Mon, 12 Jan 2026 12:00:00 GMT 144 https://www.sec.gov/Archives/edgar/data/1604464/000119312526010342/d34257d8k.htm 0001193125-26-010342 Mon, 12 Jan 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/1604464/000119312526000907/d90230d8k.htm 0001193125-26-000907 Fri, 02 Jan 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/1604464/000119312525304018/xslF345X05/ownership.xml 0001193125-25-304018 Mon, 01 Dec 2025 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000090514825004141/xslF345X05/form4.xml 0000905148-25-004141 Wed, 19 Nov 2025 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000090514825004140/xslF345X05/form4.xml 0000905148-25-004140 Wed, 19 Nov 2025 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/1604464/000090514825004102/xsl144X01/primary_doc.xml 0000905148-25-004102 Mon, 17 Nov 2025 12:00:00 GMT 144 https://www.sec.gov/Archives/edgar/data/1604464/000090514825004101/xsl144X01/primary_doc.xml 0000905148-25-004101 Mon, 17 Nov 2025 12:00:00 GMT 144 https://www.sec.gov/Archives/edgar/data/1604464/000110465925112574/xslSCHEDULE_13D_X01/primary_doc.xml 0001104659-25-112574 Fri, 14 Nov 2025 12:00:00 GMT SCHEDULE 13D/A https://www.sec.gov/Archives/edgar/data/1604464/000093583625000703/xslSCHEDULE_13G_X01/primary_doc.xml 0000935836-25-000703 Fri, 14 Nov 2025 12:00:00 GMT SCHEDULE 13G/A