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 |
|---|---|---|---|
| S-8 | Employee stock plan registration | Dec 26, 2024 | — |
| S-8 | Employee stock plan registration | Dec 28, 2022 | — |
| F-6 POS | Filing | Aug 1, 2022 | — |
| F-6 POS | Filing | Apr 12, 2017 | — |
| F-6EF | Filing | Mar 22, 2011 | — |
| F-6 | Filing | Oct 13, 2009 | — |
| S-8 | Employee stock plan registration | May 10, 2007 | — |
| F-6 POS | Post-effective amendment | Mar 19, 2007 | — |
| F-6 POS | Post-effective amendment no.1 to form f-6 | Mar 2, 2006 | — |
| S-8 | Employee stock plan registration | Jul 26, 2005 | — |
| S-8 | Employee stock plan registration | Jan 21, 2003 | — |
| 424B5 | Prospectus supplement | Mar 15, 2002 | — |
| 424B5 | Prospectus supplement | Mar 14, 2002 | — |
| F-3/A | Auto-generated paper document | Jan 25, 2002 | — |
Showing 14 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.