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 |
|---|---|---|---|
| DEF 14A | Proxy statement | Apr 24, 2026 | Apr 24, 2026 |
| DEFA14A | Additional proxy material | Apr 24, 2026 | — |
| DEFA14A | Additional proxy material | Apr 28, 2025 | — |
| DEF 14A | Proxy statement | Apr 28, 2025 | Jun 10, 2025 |
| DEFA14A | Additional proxy material | Apr 26, 2024 | — |
| DEF 14A | Proxy statement | Apr 26, 2024 | Jun 10, 2024 |
| PRE 14A | Preliminary proxy statement | Apr 12, 2024 | Jun 10, 2024 |
| DEFA14A | Additional proxy material | Apr 7, 2023 | — |
| DEF 14A | Proxy statement | Apr 7, 2023 | — |
| PRE 14A | Preliminary proxy statement | Mar 24, 2023 | — |
| DEFA14A | Additional proxy material | Apr 27, 2022 | — |
| DEF 14A | Proxy statement | Apr 27, 2022 | Jun 23, 2022 |
| DEFA14A | Additional proxy material | May 28, 2021 | — |
| DEFA14A | Additional proxy material | Apr 22, 2021 | — |
| DEF 14A | Proxy statement | Apr 22, 2021 | Jun 8, 2021 |
| DEFA14A | Additional proxy material | Jun 5, 2020 | — |
| DEFA14A | Additional proxy material | Apr 22, 2020 | — |
| DEF 14A | Proxy statement | Apr 22, 2020 | Jun 16, 2020 |
| DEFA14A | Additional proxy material | Apr 30, 2019 | — |
| DEF 14A | Proxy statement | Apr 30, 2019 | Jun 27, 2019 |
| DEFA14A | Additional proxy material | Apr 26, 2018 | — |
| DEF 14A | Proxy statement | Apr 26, 2018 | Jun 14, 2018 |
| DEFA14A | Additional proxy material | Apr 25, 2017 | — |
| DEF 14A | Proxy statement | Apr 25, 2017 | Jun 8, 2017 |
| DEFA14A | Additional proxy material | Apr 29, 2016 | — |
| DEF 14A | Proxy statement | Apr 29, 2016 | Jun 23, 2016 |
Showing 26 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.