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 |
|---|---|---|---|
| 6-K | Current report (foreign issuer) | Nov 3, 2026 | Nov 3, 2026 |
| 6-K | Current report (foreign issuer) | Oct 28, 2026 | Oct 28, 2026 |
| 6-K | Current report (foreign issuer) | Oct 28, 2026 | Oct 28, 2026 |
| 6-K | Current report (foreign issuer) | Oct 23, 2026 | Oct 23, 2026 |
| 6-K | Current report (foreign issuer) | Oct 13, 2026 | Oct 13, 2026 |
| 6-K | Current report (foreign issuer) | Oct 6, 2026 | Oct 6, 2026 |
| 6-K/A | Filing | Oct 5, 2026 | Oct 5, 2026 |
| 6-K | Current report (foreign issuer) | Oct 5, 2026 | Oct 5, 2026 |
| 6-K | Current report (foreign issuer) | Sep 29, 2026 | Sep 29, 2026 |
| 4 | Insider transaction | Sep 22, 2026 | Sep 22, 2026 |
| 3 | Initial insider ownership | Sep 18, 2026 | Sep 11, 2026 |
| 4 | Insider transaction | Sep 17, 2026 | Sep 16, 2026 |
| 4 | Insider transaction | Sep 8, 2026 | Sep 7, 2026 |
| 6-K | Current report (foreign issuer) | Sep 4, 2026 | Sep 4, 2026 |
| 6-K | Current report (foreign issuer) | Sep 2, 2026 | Sep 2, 2026 |
| 6-K | Current report (foreign issuer) | Aug 26, 2026 | Aug 26, 2026 |
| 6-K | Current report (foreign issuer) | Aug 14, 2026 | Aug 14, 2026 |
| 6-K | Current report (foreign issuer) | Aug 6, 2026 | Aug 6, 2026 |
| 6-K | Current report (foreign issuer) | Aug 5, 2026 | Aug 5, 2026 |
| 6-K | Current report (foreign issuer) | Jul 30, 2026 | Jul 30, 2026 |
| 6-K | Current report (foreign issuer) | Jul 29, 2026 | Jul 29, 2026 |
| 6-K | Current report (foreign issuer) | Jul 29, 2026 | Jul 29, 2026 |
| 6-K | Current report (foreign issuer) | Jul 21, 2026 | Jul 21, 2026 |
| 6-K | Current report (foreign issuer) | Jul 15, 2026 | Jul 15, 2026 |
| 6-K | Current report (foreign issuer) | Jul 14, 2026 | Jul 14, 2026 |
| 4 | Insider transaction | Jul 13, 2026 | Jul 13, 2026 |
| 6-K | Current report (foreign issuer) | Jul 6, 2026 | Jul 6, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 30, 2026 |
| 6-K | Current report (foreign issuer) | Jun 29, 2026 | Jun 29, 2026 |
| 6-K | Current report (foreign issuer) | Jun 23, 2026 | Jun 23, 2026 |
| 6-K | Current report (foreign issuer) | Jun 22, 2026 | Jun 22, 2026 |
| 6-K | Current report (foreign issuer) | Jun 18, 2026 | Jun 18, 2026 |
| 6-K | Current report (foreign issuer) | Jun 16, 2026 | Jun 16, 2026 |
| 6-K | Current report (foreign issuer) | Jun 5, 2026 | Jun 5, 2026 |
| 6-K | Current report (foreign issuer) | Jun 3, 2026 | Jun 3, 2026 |
| SD | Specialized disclosure (conflict minerals) | May 29, 2026 | — |
| 6-K | Current report (foreign issuer) | May 27, 2026 | May 27, 2026 |
| 6-K | Current report (foreign issuer) | May 22, 2026 | May 22, 2026 |
| 6-K | Current report (foreign issuer) | May 20, 2026 | May 20, 2026 |
| 6-K | Current report (foreign issuer) | May 15, 2026 | May 15, 2026 |
| 6-K | Current report (foreign issuer) | May 13, 2026 | May 13, 2026 |
| 6-K | Current report (foreign issuer) | May 12, 2026 | May 12, 2026 |
| 6-K | Current report (foreign issuer) | May 11, 2026 | May 11, 2026 |
| 6-K | Current report (foreign issuer) | May 8, 2026 | May 8, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | May 1, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | May 1, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | May 7, 2026 | Apr 29, 2026 |
| 6-K | Current report (foreign issuer) | May 7, 2026 | May 7, 2026 |
| 6-K | Current report (foreign issuer) | Apr 30, 2026 | Apr 30, 2026 |
| 20-F | Annual report (foreign issuer) | Apr 30, 2026 | Dec 31, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 29, 2026 | — |
| 6-K | Current report (foreign issuer) | Apr 29, 2026 | Apr 29, 2026 |
| 6-K | Current report (foreign issuer) | Apr 29, 2026 | Apr 29, 2026 |
| 6-K | Current report (foreign issuer) | Apr 21, 2026 | Apr 21, 2026 |
| 6-K | Current report (foreign issuer) | Apr 15, 2026 | Apr 15, 2026 |
| 6-K | Current report (foreign issuer) | Apr 8, 2026 | Apr 8, 2026 |
| 6-K | Current report (foreign issuer) | Mar 26, 2026 | Mar 26, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 6-K | Current report (foreign issuer) | Mar 12, 2026 | Mar 12, 2026 |
| 6-K | Current report (foreign issuer) | Mar 5, 2026 | Mar 5, 2026 |
| 6-K | Current report (foreign issuer) | Feb 25, 2026 | Feb 25, 2026 |
| 6-K | Current report (foreign issuer) | Feb 25, 2026 | Feb 25, 2026 |
| 6-K | Current report (foreign issuer) | Feb 24, 2026 | Feb 24, 2026 |
| 6-K | Current report (foreign issuer) | Feb 13, 2026 | Feb 13, 2026 |
| 6-K | Current report (foreign issuer) | Feb 5, 2026 | Feb 5, 2026 |
| 6-K | Current report (foreign issuer) | Jan 28, 2026 | Jan 28, 2026 |
| 6-K | Current report (foreign issuer) | Jan 14, 2026 | Jan 14, 2026 |
| 6-K | Current report (foreign issuer) | Jan 7, 2026 | Jan 7, 2026 |
| 6-K | Current report (foreign issuer) | Dec 30, 2025 | Dec 30, 2025 |
| 6-K | Current report (foreign issuer) | Dec 17, 2025 | Dec 17, 2025 |
| 6-K | Current report (foreign issuer) | Dec 10, 2025 | Dec 10, 2025 |
| 6-K | Current report (foreign issuer) | Dec 4, 2025 | Dec 4, 2025 |
| 6-K | Current report (foreign issuer) | Nov 28, 2025 | Nov 28, 2025 |
| 6-K | Current report (foreign issuer) | Nov 20, 2025 | Nov 20, 2025 |
| 6-K | Current report (foreign issuer) | Nov 12, 2025 | Nov 12, 2025 |
| 6-K | Current report (foreign issuer) | Nov 6, 2025 | Nov 6, 2025 |
| 6-K | Current report (foreign issuer) | Oct 29, 2025 | Oct 29, 2025 |
| 6-K | Current report (foreign issuer) | Oct 29, 2025 | Oct 29, 2025 |
| 6-K | Current report (foreign issuer) | Oct 28, 2025 | Oct 28, 2025 |
| 6-K | Current report (foreign issuer) | Oct 27, 2025 | Oct 27, 2025 |
| 6-K | Current report (foreign issuer) | Oct 21, 2025 | Oct 21, 2025 |
| 6-K | Current report (foreign issuer) | Oct 15, 2025 | Oct 15, 2025 |
| 6-K | Current report (foreign issuer) | Oct 7, 2025 | Oct 7, 2025 |
| 6-K | Current report (foreign issuer) | Sep 22, 2025 | Sep 22, 2025 |
| 6-K | Current report (foreign issuer) | Sep 10, 2025 | Sep 10, 2025 |
| 6-K | Current report (foreign issuer) | Sep 4, 2025 | Sep 4, 2025 |
| 6-K | Current report (foreign issuer) | Aug 13, 2025 | Aug 13, 2025 |
| 6-K | Current report (foreign issuer) | Aug 12, 2025 | Aug 12, 2025 |
| 6-K | Current report (foreign issuer) | Aug 6, 2025 | Aug 6, 2025 |
| 6-K | Current report (foreign issuer) | Jul 30, 2025 | Jul 30, 2025 |
| 6-K | Current report (foreign issuer) | Jul 30, 2025 | Jul 30, 2025 |
| 6-K | Current report (foreign issuer) | Jul 28, 2025 | Jul 28, 2025 |
| 6-K | Current report (foreign issuer) | Jul 22, 2025 | Jul 22, 2025 |
| 6-K | Current report (foreign issuer) | Jul 10, 2025 | Jul 10, 2025 |
| 6-K | Current report (foreign issuer) | Jul 7, 2025 | Jul 7, 2025 |
| 6-K | Current report (foreign issuer) | Jun 30, 2025 | Jun 30, 2025 |
| 6-K | Current report (foreign issuer) | Jun 20, 2025 | Jun 20, 2025 |
| 6-K | Current report (foreign issuer) | Jun 10, 2025 | Jun 10, 2025 |
| 6-K | Current report (foreign issuer) | Jun 5, 2025 | Jun 5, 2025 |
| 6-K | Current report (foreign issuer) | Jun 4, 2025 | Jun 4, 2025 |
| SD | Specialized disclosure (conflict minerals) | May 29, 2025 | — |
| 6-K | Current report (foreign issuer) | May 28, 2025 | May 28, 2025 |
| 6-K | Current report (foreign issuer) | May 15, 2025 | May 15, 2025 |
| 6-K | Current report (foreign issuer) | May 8, 2025 | May 8, 2025 |
| 6-K | Current report (foreign issuer) | Apr 24, 2025 | Apr 24, 2025 |
| 20-F | Annual report (foreign issuer) | Apr 24, 2025 | Dec 31, 2024 |
| 6-K | Current report (foreign issuer) | Apr 23, 2025 | Apr 23, 2025 |
| 6-K | Current report (foreign issuer) | Apr 23, 2025 | Apr 23, 2025 |
| 6-K | Current report (foreign issuer) | Apr 10, 2025 | Apr 10, 2025 |
| 6-K | Current report (foreign issuer) | Apr 1, 2025 | Apr 1, 2025 |
| 6-K | Current report (foreign issuer) | Mar 20, 2025 | Dec 31, 2024 |
| 6-K | Current report (foreign issuer) | Mar 11, 2025 | Mar 11, 2025 |
| 6-K | Current report (foreign issuer) | Feb 26, 2025 | Feb 26, 2025 |
| 6-K | Current report (foreign issuer) | Feb 11, 2025 | Feb 11, 2025 |
| 6-K | Current report (foreign issuer) | Jan 21, 2025 | Jan 21, 2025 |
| 6-K | Current report (foreign issuer) | Jan 13, 2025 | Jan 10, 2025 |
| 6-K | Current report (foreign issuer) | Dec 27, 2024 | Dec 27, 2024 |
| S-8 | Employee stock plan registration | Dec 26, 2024 | — |
| 6-K | Current report (foreign issuer) | Dec 18, 2024 | Dec 18, 2024 |
| 6-K | Current report (foreign issuer) | Dec 11, 2024 | Dec 11, 2024 |
| 6-K | Current report (foreign issuer) | Nov 25, 2024 | Nov 25, 2024 |
| 6-K | Current report (foreign issuer) | Nov 14, 2024 | Nov 14, 2024 |
| 6-K | Current report (foreign issuer) | Nov 13, 2024 | Sep 30, 2024 |
| 6-K | Current report (foreign issuer) | Oct 30, 2024 | Oct 30, 2024 |
| 6-K | Current report (foreign issuer) | Oct 22, 2024 | Oct 22, 2024 |
| 6-K | Current report (foreign issuer) | Oct 9, 2024 | Oct 9, 2024 |
| 6-K | Current report (foreign issuer) | Sep 12, 2024 | Sep 12, 2024 |
| 6-K | Current report (foreign issuer) | Aug 19, 2024 | Aug 19, 2024 |
| 6-K | Current report (foreign issuer) | Aug 9, 2024 | Jun 30, 2024 |
| 6-K | Current report (foreign issuer) | Jul 31, 2024 | Jul 31, 2024 |
| 6-K | Current report (foreign issuer) | Jul 17, 2024 | Jul 17, 2024 |
| 6-K | Current report (foreign issuer) | Jun 12, 2024 | Jun 12, 2024 |
| SD | Specialized disclosure (conflict minerals) | May 31, 2024 | — |
| 6-K | Current report (foreign issuer) | May 30, 2024 | May 30, 2024 |
| 6-K | Current report (foreign issuer) | May 23, 2024 | May 23, 2024 |
| 6-K | Current report (foreign issuer) | May 14, 2024 | Mar 31, 2024 |
| 6-K | Current report (foreign issuer) | Apr 25, 2024 | Apr 25, 2024 |
| 20-F | Annual report (foreign issuer) | Apr 25, 2024 | Dec 31, 2023 |
| 6-K | Current report (foreign issuer) | Apr 24, 2024 | Apr 24, 2024 |
| 6-K | Current report (foreign issuer) | Apr 16, 2024 | Apr 16, 2024 |
| 6-K | Current report (foreign issuer) | Apr 3, 2024 | Apr 3, 2024 |
| 6-K | Current report (foreign issuer) | Mar 25, 2024 | Mar 25, 2024 |
| 6-K | Current report (foreign issuer) | Mar 25, 2024 | Dec 31, 2023 |
| 6-K | Current report (foreign issuer) | Mar 22, 2024 | Mar 22, 2024 |
| 6-K | Current report (foreign issuer) | Feb 27, 2024 | Feb 27, 2024 |
| 6-K | Current report (foreign issuer) | Feb 26, 2024 | Feb 26, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 5, 2024 | — |
| 6-K | Current report (foreign issuer) | Jan 31, 2024 | Jan 31, 2024 |
| 6-K | Current report (foreign issuer) | Jan 26, 2024 | Jan 26, 2024 |
| 6-K | Current report (foreign issuer) | Jan 25, 2024 | Jan 25, 2024 |
| 6-K | Current report (foreign issuer) | Dec 26, 2023 | Dec 26, 2023 |
| 6-K | Current report (foreign issuer) | Nov 27, 2023 | Nov 27, 2023 |
| 6-K | Current report (foreign issuer) | Nov 14, 2023 | Sep 30, 2023 |
| 6-K | Current report (foreign issuer) | Oct 25, 2023 | Oct 25, 2023 |
| 6-K | Current report (foreign issuer) | Sep 25, 2023 | Sep 25, 2023 |
| 6-K | Current report (foreign issuer) | Aug 25, 2023 | Aug 25, 2023 |
| 6-K | Current report (foreign issuer) | Aug 22, 2023 | Jun 30, 2023 |
| 6-K | Current report (foreign issuer) | Jul 26, 2023 | Jul 26, 2023 |
| 6-K | Current report (foreign issuer) | Jul 25, 2023 | Jul 25, 2023 |
| 6-K | Current report (foreign issuer) | Jun 26, 2023 | Jun 26, 2023 |
| SD | Specialized disclosure (conflict minerals) | May 31, 2023 | — |
| 6-K | Current report (foreign issuer) | May 31, 2023 | May 31, 2023 |
| 6-K | Current report (foreign issuer) | May 25, 2023 | May 25, 2023 |
| 6-K | Current report (foreign issuer) | May 15, 2023 | Mar 31, 2023 |
| 6-K | Current report (foreign issuer) | Apr 27, 2023 | Apr 27, 2023 |
| 20-F | Annual report (foreign issuer) | Apr 27, 2023 | Dec 31, 2022 |
| 6-K | Current report (foreign issuer) | Apr 26, 2023 | Apr 26, 2023 |
| 6-K | Current report (foreign issuer) | Apr 25, 2023 | Apr 25, 2023 |
| 6-K | Current report (foreign issuer) | Mar 27, 2023 | Mar 27, 2023 |
| 6-K | Current report (foreign issuer) | Mar 20, 2023 | Dec 31, 2022 |
| 6-K | Current report (foreign issuer) | Feb 24, 2023 | Feb 24, 2023 |
| 6-K | Current report (foreign issuer) | Feb 22, 2023 | Feb 22, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2023 | — |
| 6-K | Current report (foreign issuer) | Jan 30, 2023 | Jan 30, 2023 |
| 6-K | Current report (foreign issuer) | Jan 17, 2023 | Jan 17, 2023 |
Showing 200 filings, the most recent 200. 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.