{"filing":{"accession_number":"0001193125-26-271747","cik":"0001033767","ticker":"UMC","company_name":"UNITED MICROELECTRONICS CORP","form":"6-K","filing_date":"2026-06-16","report_date":null,"primary_document":"6k_on_06162026.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1033767/000119312526271747/6k_on_06162026.htm"},"events":[{"id":12324,"run_id":10892,"accession_number":"0001193125-26-271747","anchor_item_number":"EX-99","event_type":"financial_other","event_domain":"financial","is_material":true,"confidence":0.85,"summary":"Exhibit 99.1 discloses UMC's disposal of 1,174,694 shares of Novatek Microelectronics Corporation through conversion of zero-coupon exchangeable bonds due 2026, generating a gain of $386,963,843 NTD to retained earnings. This is a material asset disposition affecting the company's investment portfolio (42.27% of total assets, 57.85% of equity). Exhibit 99.2 is a routine monthly report of insider trading and pledge activity with no changes reported, which is administrative. The primary material event is the Novatek share disposal in 99.1.","company_name":"UNITED MICROELECTRONICS CORP","ticker":"UMC","filing_date":"2026-06-16","form":"6-K","submitted_at":null,"items":[{"id":9147,"accession_number":"0001193125-26-271747","item_number":"EX-99","item_title":"umc-ex99.htm","event_type":"financial_other","event_domain":"financial","is_material":true,"confidence":0.85,"reasoning":"Exhibit 99.1 discloses UMC's disposal of 1,174,694 shares of Novatek Microelectronics Corporation through conversion of zero-coupon exchangeable bonds due 2026, generating a gain of $386,963,843 NTD to retained earnings. This is a material asset disposition affecting the company's investment portfolio (42.27% of total assets, 57.85% of equity). Exhibit 99.2 is a routine monthly report of insider trading and pledge activity with no changes reported, which is administrative. The primary material event is the Novatek share disposal in 99.1.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-06-22T02:37:51.380839+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":9147,"accession_number":"0001193125-26-271747","item_number":"EX-99","item_title":"umc-ex99.htm","event_type":"financial_other","event_domain":"financial","is_material":true,"confidence":0.85,"reasoning":"Exhibit 99.1 discloses UMC's disposal of 1,174,694 shares of Novatek Microelectronics Corporation through conversion of zero-coupon exchangeable bonds due 2026, generating a gain of $386,963,843 NTD to retained earnings. This is a material asset disposition affecting the company's investment portfolio (42.27% of total assets, 57.85% of equity). Exhibit 99.2 is a routine monthly report of insider trading and pledge activity with no changes reported, which is administrative. The primary material event is the Novatek share disposal in 99.1.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-06-22T02:37:51.380839+00:00","company_name":"UNITED MICROELECTRONICS CORP","ticker":"UMC","filing_date":"2026-06-16"}]}