Atara Biotherapeutics ATRA SEC Filings

NASDAQ ATRA
$8.03 -0.19 (-2.37%)
As of: Nov 12, 2026 · 11:08 AM EST
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
1S-3Prospectus0001104659-26-125314Nov 10, 2026 4:59 PM
210-QQuarterly & Annual Report0001104659-26-125192Nov 10, 2026 4:15 PM
38-KCurrent Report0001104659-26-125171Nov 10, 2026 4:10 PM
44Insider Transaction0000905148-26-004085Sep 4, 2026 10:20 PM
5144Insider Transaction0000905148-26-003961Aug 26, 2026 11:47 PM
64Insider Transaction0000905148-26-003960Aug 26, 2026 11:45 PM
7SCHEDULE 13GBeneficial Ownership Report0000919574-26-005481Aug 14, 2026 8:06 PM
810-QQuarterly & Annual Report0001193125-26-346885Aug 12, 2026 8:15 PM
98-KCurrent Report0001193125-26-346857Aug 12, 2026 8:10 PM
104Insider Transaction0001104659-26-086733Jul 24, 2026 1:00 AM
11SCHEDULE 13DBeneficial Ownership Report0001104659-26-086728Jul 24, 2026 12:00 AM
123Insider Transaction0000905148-26-003168Jul 6, 2026 8:14 PM
138-KCurrent Report0001193125-26-285498Jun 26, 2026 8:15 PM
144Insider Transaction0000905148-26-002951Jun 15, 2026 10:51 PM
153Insider Transaction0000905148-26-002950Jun 15, 2026 10:48 PM
16S-8Prospectus0001213900-26-068286Jun 12, 2026 8:21 PM
178-KCurrent Report0001213900-26-068264Jun 12, 2026 8:05 PM
184Insider Transaction0000905148-26-002921Jun 11, 2026 8:37 PM
194Insider Transaction0000905148-26-002920Jun 11, 2026 8:36 PM
204Insider Transaction0000905148-26-002919Jun 11, 2026 8:36 PM
214Insider Transaction0000905148-26-002571May 20, 2026 9:24 PM
224Insider Transaction0000905148-26-002570May 20, 2026 9:24 PM
23144Insider Transaction0000905148-26-002507May 18, 2026 8:45 PM
24144Insider Transaction0000905148-26-002506May 18, 2026 8:44 PM
25SCHEDULE 13DBeneficial Ownership Report0001104659-26-061506May 14, 2026 1:00 AM
26SCHEDULE 13GBeneficial Ownership Report0000919574-26-002914May 13, 2026 1:06 PM
27424B5Prospectus0001193125-26-219518May 12, 2026 8:20 PM
2810-QQuarterly & Annual Report0001193125-26-219482May 12, 2026 8:15 PM
298-KCurrent Report0001193125-26-219420May 12, 2026 8:10 PM
30SCHEDULE 13DBeneficial Ownership Report0001193125-26-217389May 11, 2026 10:49 PM
314Insider Transaction0001193125-26-217380May 11, 2026 10:45 PM
324Insider Transaction0000935836-26-000239May 11, 2026 9:34 PM
333Insider Transaction0000935836-26-000238May 11, 2026 9:33 PM
34SCHEDULE 13GBeneficial Ownership Report0000919574-26-002802May 8, 2026 8:10 PM
35144Insider Transaction0001193125-26-212781May 7, 2026 12:30 AM
36SCHEDULE 13GBeneficial Ownership Report0000935836-26-000230May 7, 2026 11:26 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
43CORRESPOthers0001193125-26-119715Mar 23, 2026 8:05 PM
44UPLOADOthers0000000000-26-002840Mar 20, 2026 5:30 PM
454Insider Transaction0001193125-26-116060Mar 19, 2026 8:30 PM
46S-3Prospectus0001193125-26-110849Mar 17, 2026 8:17 PM
47424B5Prospectus0001193125-26-108386Mar 16, 2026 8:20 PM
4810-KQuarterly & Annual Report0001193125-26-108361Mar 16, 2026 8:15 PM
498-KCurrent Report0001193125-26-108344Mar 16, 2026 8:10 PM
508-KCurrent Report0001193125-26-103127Mar 12, 2026 12:10 PM
...

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