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 |
|---|---|---|---|
| 20-F | Annual report (foreign issuer) | Apr 30, 2026 | Dec 31, 2025 |
| 20-F | Annual report (foreign issuer) | Apr 24, 2025 | Dec 31, 2024 |
| 20-F | Annual report (foreign issuer) | Apr 25, 2024 | Dec 31, 2023 |
| 20-F | Annual report (foreign issuer) | Apr 27, 2023 | Dec 31, 2022 |
| 20-F | Annual report (foreign issuer) | Apr 28, 2022 | Dec 31, 2021 |
| 20-F | Annual report (foreign issuer) | Apr 29, 2021 | Dec 31, 2020 |
| 20-F | Annual report (foreign issuer) | Apr 28, 2020 | Dec 31, 2019 |
| 20-F | Annual report (foreign issuer) | Apr 25, 2019 | Dec 31, 2018 |
| 20-F | Annual report (foreign issuer) | Apr 26, 2018 | Dec 31, 2017 |
| 20-F | Annual report (foreign issuer) | Apr 13, 2017 | Dec 31, 2016 |
| 20-F | Annual report (foreign issuer) | Apr 18, 2016 | Dec 31, 2015 |
| 20-F | Annual report (foreign issuer) | Apr 21, 2015 | Dec 31, 2014 |
| 20-F | Annual report (foreign issuer) | Apr 18, 2014 | Dec 31, 2013 |
| 20-F | Annual report (foreign issuer) | Apr 26, 2013 | Dec 31, 2012 |
| 20-F | Annual report (foreign issuer) | Apr 26, 2012 | Dec 31, 2011 |
| 20-F | Annual report (foreign issuer) | Apr 29, 2011 | Dec 31, 2010 |
| 20-F | Annual report (foreign issuer) | Apr 30, 2010 | Dec 31, 2009 |
| 20-F | Annual report (foreign issuer) | May 8, 2009 | Dec 31, 2008 |
| 20-F | Annual report (foreign issuer) | May 2, 2008 | Dec 31, 2007 |
| 20-F | Annual report (foreign issuer) | May 9, 2007 | Dec 31, 2006 |
| 20-F | Annual report (foreign issuer) | Jun 26, 2006 | Dec 31, 2005 |
| 20-F/A | Amended annual report (foreign issuer) | Feb 13, 2006 | Dec 31, 2004 |
| 20-F | Annual report (foreign issuer) | Jun 29, 2005 | Dec 31, 2004 |
| 20-F | Annual report (foreign issuer) | Jun 17, 2004 | Dec 31, 2003 |
| 20-F | Annual report (foreign issuer) | Jun 25, 2003 | Dec 31, 2002 |
| 20-F | Annual report (foreign issuer) | Jun 13, 2002 | Dec 31, 2001 |
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
- 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.