Atara Biotherapeutics, Inc. SEC filings ATRA
Atara Biotherapeutics, Inc. has 1,002 filings in SEC EDGAR's recent list, going back to Jul 9, 2015. Its latest annual report, Form 10-K, was filed on Mar 16, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 12, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Aug 12, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| EFFECT | Filing | Mar 25, 2026 | — |
| CORRESP | Letter to the SEC | Mar 23, 2026 | — |
| UPLOAD | Letter from the SEC | Mar 20, 2026 | — |
| DEFR14A | Filing | May 10, 2024 | — |
| EFFECT | Filing | Nov 13, 2023 | — |
| CORRESP | Letter to the SEC | Nov 8, 2023 | — |
| UPLOAD | Letter from the SEC | Nov 6, 2023 | — |
| UPLOAD | Letter from the SEC | May 2, 2023 | — |
| CORRESP | Letter to the SEC | Apr 21, 2023 | — |
| UPLOAD | Letter from the SEC | Mar 27, 2023 | — |
| EFFECT | Filing | Feb 13, 2023 | — |
| POSASR | Filing | Feb 8, 2023 | — |
| CT ORDER | Filing | Mar 11, 2019 | — |
| CT ORDER | Filing | Aug 20, 2018 | — |
| CT ORDER | Filing | Dec 19, 2016 | — |
| EFFECT | Filing | Nov 23, 2015 | — |
| UPLOAD | Letter from the SEC | Nov 19, 2015 | — |
| CORRESP | Letter to the SEC | Nov 19, 2015 | — |
| DEL AM | Filing | Nov 10, 2015 | — |
| EFFECT | Filing | Jul 9, 2015 | — |
Showing 20 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Biological Products, (No Diagnostic Substances) (SIC 2836)
- Listed as
- ATRA (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Thousand Oaks, CA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1604464
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All 182 Biological Products, (No Diagnostic Substances) companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.