United Microelectronics Corp SEC filings UMC
United Microelectronics Corp has 742 filings in SEC EDGAR's recent list, going back to Feb 14, 1997. Its latest annual report, Form 20-F, was filed on Apr 30, 2026 for the period ended Dec 31, 2025. The most recent current report (Form 6-K) was filed on Nov 3, 2026. The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SD | Specialized disclosure (conflict minerals) | May 29, 2026 | — |
| SD | Specialized disclosure (conflict minerals) | May 29, 2025 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2024 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2023 | — |
| SD | Specialized disclosure (conflict minerals) | May 27, 2022 | — |
| SD | Specialized disclosure (conflict minerals) | May 28, 2021 | — |
| UPLOAD | Letter from the SEC | Nov 17, 2020 | — |
| CORRESP | Letter to the SEC | Nov 6, 2020 | — |
| UPLOAD | Letter from the SEC | Oct 29, 2020 | — |
| SD | Specialized disclosure (conflict minerals) | May 29, 2020 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2019 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2018 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2017 | — |
| UPLOAD | Letter from the SEC | Jun 17, 2016 | — |
| CORRESP | Letter to the SEC | Jun 15, 2016 | — |
| UPLOAD | Letter from the SEC | Jun 8, 2016 | — |
| CORRESP | Letter to the SEC | Jun 1, 2016 | — |
| SD | Specialized disclosure (conflict minerals) | May 20, 2016 | — |
| UPLOAD | Letter from the SEC | May 10, 2016 | — |
| UPLOAD | Letter from the SEC | Jun 8, 2015 | — |
| CORRESP | Letter to the SEC | May 29, 2015 | — |
| SD | Specialized disclosure (conflict minerals) | May 22, 2015 | — |
| UPLOAD | Letter from the SEC | May 21, 2015 | — |
| UPLOAD | Letter from the SEC | Jan 21, 2015 | — |
| CORRESP | Letter to the SEC | Jan 12, 2015 | — |
| UPLOAD | Letter from the SEC | Dec 22, 2014 | — |
| UPLOAD | Letter from the SEC | Jul 28, 2014 | — |
| CORRESP | Letter to the SEC | Jul 24, 2014 | — |
| UPLOAD | Letter from the SEC | Jul 22, 2014 | — |
| CORRESP | Letter to the SEC | Jun 20, 2014 | — |
| UPLOAD | Letter from the SEC | May 29, 2014 | — |
| SD | Specialized disclosure (conflict minerals) | May 29, 2014 | — |
| UPLOAD | Letter from the SEC | Aug 3, 2012 | — |
| CORRESP | Letter to the SEC | Aug 1, 2012 | — |
| UPLOAD | Letter from the SEC | Jul 24, 2012 | — |
| UPLOAD | Letter from the SEC | Jul 14, 2011 | — |
| CORRESP | Letter to the SEC | Jul 12, 2011 | — |
| UPLOAD | Letter from the SEC | Jun 30, 2011 | — |
| UPLOAD | Letter from the SEC | Jul 9, 2010 | — |
| CORRESP | Letter to the SEC | Jul 6, 2010 | — |
| UPLOAD | Letter from the SEC | Jun 10, 2010 | — |
| EFFECT | Filing | Oct 20, 2009 | — |
| UPLOAD | Letter from the SEC | Aug 5, 2009 | — |
| CORRESP | Letter to the SEC | Jul 29, 2009 | — |
| UPLOAD | Letter from the SEC | Jul 13, 2009 | — |
| UPLOAD | Letter from the SEC | Mar 27, 2006 | — |
| CORRESP | Letter to the SEC | Dec 13, 2005 | — |
| UPLOAD | Letter from the SEC | Oct 3, 2005 | — |
Showing 48 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
- Semiconductors & Related Devices (SIC 3674)
- Listed as
- UMC (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- Taiwan
- Headquarters
- Taipei, Taiwan
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1033767
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.