Atara Biotherapeutics ATRA SEC Filings

NASDAQ ATRA
$9.43 +0.08 (+0.86%)
At close: Oct 22, 2026 · 4:00 PM EDT
EDGAR Disclosures

SEC Filings

Source SEC EDGAR

Every SEC filing Atara Biotherapeutics, Inc. (ATRA) has made, as reported on EDGAR — annual and quarterly reports, current reports, insider transactions and ownership disclosures. Filter by form group, form type or period, and open any filing or its index directly.

Form Type
# Form Type Form Group Accession Date Filing Index
14Insider Transaction0000905148-26-004085Sep 4, 2026 10:20 PM
2144Insider Transaction0000905148-26-003961Aug 26, 2026 11:47 PM
34Insider Transaction0000905148-26-003960Aug 26, 2026 11:45 PM
410-QQuarterly & Annual Report0001193125-26-346885Aug 12, 2026 4:15 PM
58-KCurrent Report0001193125-26-346857Aug 12, 2026 4:10 PM
64Insider Transaction0001104659-26-086733Jul 24, 2026 1:00 AM
7SCHEDULE 13DBeneficial Ownership Report0001104659-26-086728Jul 24, 2026 12:00 AM
83Insider Transaction0000905148-26-003168Jul 6, 2026 8:14 PM
98-KCurrent Report0001193125-26-285498Jun 26, 2026 8:15 PM
104Insider Transaction0000905148-26-002951Jun 15, 2026 10:51 PM
113Insider Transaction0000905148-26-002950Jun 15, 2026 10:48 PM
12S-8Prospectus0001213900-26-068286Jun 12, 2026 4:21 PM
138-KCurrent Report0001213900-26-068264Jun 12, 2026 4:05 PM
144Insider Transaction0000905148-26-002921Jun 11, 2026 8:37 PM
154Insider Transaction0000905148-26-002920Jun 11, 2026 8:36 PM
164Insider Transaction0000905148-26-002919Jun 11, 2026 8:36 PM
174Insider Transaction0000905148-26-002571May 20, 2026 9:24 PM
184Insider Transaction0000905148-26-002570May 20, 2026 9:24 PM
19144Insider Transaction0000905148-26-002507May 18, 2026 8:45 PM
20144Insider Transaction0000905148-26-002506May 18, 2026 8:44 PM
21SCHEDULE 13GBeneficial Ownership Report0000919574-26-002914May 13, 2026 1:06 PM
22424B5Prospectus0001193125-26-219518May 12, 2026 8:20 PM
2310-QQuarterly & Annual Report0001193125-26-219482May 12, 2026 8:15 PM
248-KCurrent Report0001193125-26-219420May 12, 2026 8:10 PM
25SCHEDULE 13DBeneficial Ownership Report0001193125-26-217389May 11, 2026 10:49 PM
26SCHEDULE 13DBeneficial Ownership Report0001193125-26-217389May 11, 2026 10:49 PM
274Insider Transaction0001193125-26-217380May 11, 2026 10:45 PM
284Insider Transaction0001193125-26-217380May 11, 2026 10:45 PM
294Insider Transaction0001193125-26-217380May 11, 2026 10:45 PM
304Insider Transaction0000935836-26-000239May 11, 2026 9:34 PM
314Insider Transaction0000935836-26-000239May 11, 2026 9:34 PM
324Insider Transaction0000935836-26-000239May 11, 2026 9:34 PM
333Insider Transaction0000935836-26-000238May 11, 2026 9:33 PM
343Insider Transaction0000935836-26-000238May 11, 2026 9:33 PM
353Insider Transaction0000935836-26-000238May 11, 2026 9:33 PM
36SCHEDULE 13D/AOthers0001193125-26-217389May 11, 2026 6:49 PM
378-KCurrent Report0001193125-26-210413May 7, 2026 12:10 PM
388-KCurrent Report0001193125-26-201397May 1, 2026 8:05 PM
39DEF 14AOthers0001193125-26-177285Apr 24, 2026 8:15 PM
40DEFA14AOthers0001193125-26-177280Apr 24, 2026 8:15 PM
41EFFECTOthers9999999995-26-000930Mar 25, 2026 4:15 AM
42424B3Prospectus0001193125-26-124322Mar 25, 2026 9:07 PM
434Insider Transaction0001193125-26-116060Mar 19, 2026 8:30 PM
44S-3Prospectus0001193125-26-110849Mar 17, 2026 8:17 PM
45424B5Prospectus0001193125-26-108386Mar 16, 2026 8:20 PM
4610-KQuarterly & Annual Report0001193125-26-108361Mar 16, 2026 8:15 PM
478-KCurrent Report0001193125-26-108344Mar 16, 2026 8:10 PM
488-KCurrent Report0001193125-26-103127Mar 12, 2026 12:10 PM
494Insider Transaction0000905148-26-001225Mar 11, 2026 9:46 PM
504Insider Transaction0000905148-26-001225Mar 11, 2026 9:46 PM
...

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