20-F 1 d168667d20f.htm FORM 20-F Form 20-F
3 Years5 Yearsmonth-end 30 daysmonth-end 60 daysmonth-end or net 30 daysmonth-end or net 60 daysP1Y0.00100.00100.00100.00100.00100.0010falseFY0001033767F5TW 0001033767 2020-12-31 0001033767 2021-12-31 0001033767 2021-01-01 2021-12-31 0001033767 2020-01-01 2020-12-31 0001033767 2019-01-01 2019-12-31 0001033767 2015-05-18 0001033767 2020-01-01 0001033767 2022-02-24 0001033767 2022-02-24 2022-02-24 0001033767 2019-12-31 0001033767 2018-12-31 0001033767 umc:CommonStock1Member 2020-12-31 0001033767 umc:PreferredStock1Member 2020-12-31 0001033767 umc:FundsMember 2020-12-31 0001033767 umc:ConvertibleBondsMember 2020-12-31 0001033767 ifrs-full:ForwardContractMember 2020-12-31 0001033767 ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:FinancialAssetsNeitherPastDueNorImpairedMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:FinancialAssetsPastDueButNotImpairedMember ifrs-full:NotLaterThanOneMonthMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:FinancialAssetsPastDueButNotImpairedMember ifrs-full:LaterThanOneMonthAndNotLaterThanTwoMonthsMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:FinancialAssetsPastDueButNotImpairedMember ifrs-full:LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:FinancialAssetsPastDueButNotImpairedMember ifrs-full:LaterThanThreeMonthsAndNotLaterThanFourMonthsMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:FinancialAssetsPastDueButNotImpairedMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:FinancialAssetsPastDueButNotImpairedMember ifrs-full:LaterThanFourMonthsMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 umc:ShortTermLinesOfCreditMember 2020-12-31 0001033767 umc:SiliconIntegratedSystemsCorpMember 2020-12-31 0001033767 umc:UnimicronHoldingLimitedMember 2020-12-31 0001033767 umc:ITETechIncMember 2020-12-31 0001033767 umc:NovatekMicroElectronicsCorpMember 2020-12-31 0001033767 umc:ShinEtsuHandotaiTaiwanCoLtdMember 2020-12-31 0001033767 umc:MTICHoldingsPteLtdMember 2020-12-31 0001033767 umc:UnsecuredBankLoansMember 2020-12-31 0001033767 umc:SecuredLongtermLoanFromMegaInternationalCommercialBank2Member ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:SecuredLongtermLoanFromTaiwanCooperativeBank1Member 2020-12-31 0001033767 umc:SecuredLongtermLoanFromTaiwanCooperativeBank2Member ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 umc:SecuredLongtermLoanFromMegaInternationalCommercialBank1Member ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 umc:SecuredLongtermLoanFromTaiwanCooperativeBank3Member ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:SecuredLongtermLoanFromTaiwanCooperativeBank4Member 2020-12-31 0001033767 umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 umc:UnsecuredLongtermLoanFromIcbcBankMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredLongtermLoanFromXiamenBankMember 2020-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredLongtermLoanFromTaiwanCooperativeBankMember 2020-12-31 0001033767 umc:UnsecuredRevolvingLoanFromMegaInternationalCommercialBankNoteBMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredRevolvingLoanFromTaipeiFubonBankNoteCMember 2020-12-31 0001033767 umc:UnsecuredRevolvingLoanFromChangHwaCommercialBankNoteDMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredRevolvingLoanFromKgiBankNoteEMember 2020-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredRevolvingLoanFromFirstCommercialBank1NoteFMember 2020-12-31 0001033767 umc:UnsecuredLongTermLoanFromBankOfTaiwanMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 umc:SecuredSyndicatedLoansFromChinaDevelopmentBankMember umc:HejianTechnologySuzhouCoLtdMember ifrs-full:TopOfRangeMember 2020-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankMember 2020-12-31 0001033767 ifrs-full:TopOfRangeMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankMember 2020-12-31 0001033767 umc:SecuredSyndicatedLoansFromChinaDevelopmentBankMember 2020-12-31 0001033767 umc:InvestmentsWithPublishedPriceQuotationsMember 2020-12-31 0001033767 umc:InvestmentsWithPublishedPriceQuotationsMember ifrs-full:AtFairValueMember 2020-12-31 0001033767 ifrs-full:ActuarialAssumptionOfDiscountRatesMember 2020-12-31 0001033767 ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesMember 2020-12-31 0001033767 ifrs-full:LaterThanFiveYearsAndNotLaterThanTenYearsMember 2020-12-31 0001033767 ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember 2020-12-31 0001033767 ifrs-full:Level1OfFairValueHierarchyMember 2020-12-31 0001033767 ifrs-full:Level2OfFairValueHierarchyMember 2020-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember 2020-12-31 0001033767 umc:DiscountForLackOfMarketabilityMember ifrs-full:EquityPriceRiskMember ifrs-full:MarketApproachMember umc:UnlistedEquitySecuritiesMember 2020-12-31 0001033767 ifrs-full:NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember ifrs-full:Level1OfFairValueHierarchyMember 2020-12-31 0001033767 ifrs-full:NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember 2020-12-31 0001033767 country:TW 2020-12-31 0001033767 country:SG 2020-12-31 0001033767 umc:ChinaIncludesHongKongMember 2020-12-31 0001033767 country:JP 2020-12-31 0001033767 country:US 2020-12-31 0001033767 umc:Europe1Member 2020-12-31 0001033767 umc:AllOtherCountriesMember 2020-12-31 0001033767 ifrs-full:BottomOfRangeMember 2020-12-31 0001033767 ifrs-full:TopOfRangeMember 2020-12-31 0001033767 ifrs-full:NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember ifrs-full:Level2OfFairValueHierarchyMember 2020-12-31 0001033767 ifrs-full:AssociatesMember 2020-12-31 0001033767 ifrs-full:OtherRelatedPartiesMember 2020-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember umc:UMCGroupUSAMember 2020-12-31 0001033767 umc:UnitedSemiconductorJapanCoLtdUsjcMember umc:UMCGroupUSAMember 2020-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember 2020-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember umc:UMCGroupUSAMember 2020-12-31 0001033767 umc:UMCGroupUSAMember 2020-12-31 0001033767 umc:SalesOfGoodsAndServicesMember 2020-12-31 0001033767 umc:AdjustmentInLossAllowanceMember 2020-12-31 0001033767 umc:AllOtherRelatedPartiesMember 2020-12-31 0001033767 ifrs-full:EquityPriceRiskMember 2020-12-31 0001033767 ifrs-full:CurrencyRiskMember currency:JPY 2020-12-31 0001033767 umc:ChinaYuanRenminbiMember ifrs-full:CurrencyRiskMember 2020-12-31 0001033767 ifrs-full:CurrencyRiskMember umc:TaiwanDollarsMember 2020-12-31 0001033767 ifrs-full:InterestRateRiskMember 2020-12-31 0001033767 umc:AmericanDepositarySharesMember 2020-12-31 0001033767 umc:StockOfWellysunIncMember ifrs-full:AssociatesMember 2020-12-31 0001033767 umc:UnsecuredDomesticBondsPayableMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 umc:DiscountsOnBondsPayableMember 2020-12-31 0001033767 ifrs-full:NotLaterThanOneYearMember 2020-12-31 0001033767 ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember 2020-12-31 0001033767 ifrs-full:LaterThanFiveYearsMember 2020-12-31 0001033767 ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember 2020-12-31 0001033767 umc:HsunChiehInvestmentCoLtdMember 2020-12-31 0001033767 umc:YannYuanInvestmentCoLtdMember 2020-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:CustomsMember 2020-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:ScienceParkBureauMember 2020-12-31 0001033767 umc:DormitoryLeaseMember umc:RefundableDepositsTimeDepositMember umc:ScienceParkBureauMember 2020-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:LiquefiedNaturalGasBusinessDivisionCPCCorporationTaiwanMember 2020-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:BankOfChinaAndAgriculturalBankOfChinaMember 2020-12-31 0001033767 ifrs-full:BuildingsMember umc:TaiwanCooperativeBankAndSecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2020-12-31 0001033767 umc:MachineryAndEquipment1Member umc:TaiwanCooperativeBankMegaInternationalCommercialBankKGIBankFirstCommercialBankAndSecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2020-12-31 0001033767 umc:TransportationEquipmentsMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2020-12-31 0001033767 umc:FurnitureAndFixtureMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2020-12-31 0001033767 ifrs-full:RightofuseAssetsMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2020-12-31 0001033767 ifrs-full:OtherTemporaryDifferencesMember 2020-12-31 0001033767 umc:UnrealizedProfitOnIntercompanySalesMember 2020-12-31 0001033767 umc:InvestmentLossMember 2020-12-31 0001033767 umc:AllowanceForInventoryValuationLossesMember 2020-12-31 0001033767 umc:RefundLiabilitiesMember 2020-12-31 0001033767 umc:DefinedBenefitPlanMember 2020-12-31 0001033767 ifrs-full:UnusedTaxLossesMember 2020-12-31 0001033767 ifrs-full:AccumulatedDepreciationAndAmortisationMember 2020-12-31 0001033767 umc:FaradayTechnologyCorpMember 2020-12-31 0001033767 umc:UnimicronTechnologyCorpMember 2020-12-31 0001033767 umc:MTICHoldingsPteLtdMember 2020-12-31 0001033767 umc:PuriumfilIncMember 2020-12-31 0001033767 umc:UnitechCapitalIncMember 2020-12-31 0001033767 umc:TriKnightCapitalCorporationMember 2020-12-31 0001033767 umc:HsunChienCapitalCorporationMember 2020-12-31 0001033767 umc:UnitedLEDCorporationHongKongLimitedMember 2020-12-31 0001033767 umc:VSenseCoLtdMember 2020-12-31 0001033767 umc:TranslinkCapitalPartnersILPMember 2020-12-31 0001033767 umc:AmortizableAssetsMember 2020-12-31 0001033767 umc:InvestmentGainMember 2020-12-31 0001033767 ifrs-full:UnrealisedForeignExchangeGainsLossesMember 2020-12-31 0001033767 ifrs-full:LandMember 2020-12-31 0001033767 ifrs-full:BuildingsMember 2020-12-31 0001033767 umc:MachineryAndEquipment1Member 2020-12-31 0001033767 ifrs-full:VehiclesMember 2020-12-31 0001033767 ifrs-full:OtherPropertyPlantAndEquipmentMember 2020-12-31 0001033767 ifrs-full:GoodwillMember 2020-12-31 0001033767 ifrs-full:ComputerSoftwareMember 2020-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember 2020-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember 2020-12-31 0001033767 umc:TaipeiFubonBankMember umc:UnsecuredRevolvingLoanMember 2020-12-31 0001033767 umc:ChangHwaCommercialBankMember umc:UnsecuredRevolvingLoanMember 2020-12-31 0001033767 umc:KgiCommercialBankMember umc:UnsecuredRevolvingLoanMember 2020-12-31 0001033767 umc:AllowancesMember 2020-12-31 0001033767 ifrs-full:OrdinarySharesMember 2020-12-31 0001033767 ifrs-full:PreferenceSharesMember 2020-12-31 0001033767 umc:StockAppreciationRightPlanForEmployeesMember 2020-12-31 0001033767 umc:CommonStock1Member 2021-12-31 0001033767 umc:PreferredStock1Member 2021-12-31 0001033767 umc:FundsMember 2021-12-31 0001033767 umc:ConvertibleBondsMember 2021-12-31 0001033767 ifrs-full:ForwardContractMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsNeitherPastDueNorImpairedMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsPastDueButNotImpairedMember ifrs-full:NotLaterThanOneMonthMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsPastDueButNotImpairedMember ifrs-full:LaterThanOneMonthAndNotLaterThanTwoMonthsMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsPastDueButNotImpairedMember ifrs-full:LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsPastDueButNotImpairedMember ifrs-full:LaterThanFourMonthsMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsPastDueButNotImpairedMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember ifrs-full:LaterThanThreeMonthsAndNotLaterThanFourMonthsMember ifrs-full:FinancialAssetsPastDueButNotImpairedMember 2021-12-31 0001033767 umc:ShortTermLinesOfCreditMember 2021-12-31 0001033767 umc:SiliconIntegratedSystemsCorpMember 2021-12-31 0001033767 umc:UnimicronHoldingLimitedMember 2021-12-31 0001033767 umc:ITETechIncMember 2021-12-31 0001033767 umc:NovatekMicroElectronicsCorpMember 2021-12-31 0001033767 umc:ShinEtsuHandotaiTaiwanCoLtdMember 2021-12-31 0001033767 umc:MTICHoldingsPteLtdMember 2021-12-31 0001033767 umc:ChipBondTechnologyCorporationMember 2021-12-31 0001033767 umc:UnsecuredBankLoansMember 2021-12-31 0001033767 umc:SecuredLongtermLoanFromMegaInternationalCommercialBank2Member ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:SecuredLongtermLoanFromTaiwanCooperativeBank1Member 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:SecuredLongtermLoanFromFirstCommercialBankMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:SecuredLongtermLoanFromKgiBankMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredLongtermLoanFromBankOfTaiwan2Member 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredRevolvingLoanFromKgiBank2NoteEMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredRevolvingLoanFromYuantaCommercialBankNoteHMember 2021-12-31 0001033767 umc:SecuredLongtermLoanFromTaiwanCooperativeBank2Member ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 umc:SecuredLongtermLoanFromTaiwanCooperativeBank3Member ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:SecuredLongtermLoanFromTaiwanCooperativeBank4Member 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:SecuredLongtermLoanFromTaiwanCooperativeBank5Member 2021-12-31 0001033767 umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6Others2Member ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredLongtermLoanFromXiamenBankMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredLongtermLoanFromBankOfChinaMember 2021-12-31 0001033767 umc:UnsecuredLongTermLoanFromBankOfTaiwanMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredLongtermLoanFromTaiwanCooperativeBankMember 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromMegaInternationalCommercialBankNoteBMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredRevolvingLoanFromTaipeiFubonBankNoteCMember 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromChangHwaCommercialBankNoteDMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember umc:UnsecuredRevolvingLoanFromFirstCommercialBank1NoteFMember 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromFirstCommercialBank2NoteGMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromFirstCommercialBank3NoteGMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromFirstCommercialBank4NoteGMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 umc:SecuredSyndicatedLoansFromChinaDevelopmentBankMember umc:HejianTechnologySuzhouCoLtdMember ifrs-full:TopOfRangeMember 2021-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankMember 2021-12-31 0001033767 ifrs-full:TopOfRangeMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankMember 2021-12-31 0001033767 umc:SecuredSyndicatedLoansFromChinaDevelopmentBankMember 2021-12-31 0001033767 umc:InvestmentsWithPublishedPriceQuotationsMember 2021-12-31 0001033767 umc:InvestmentsWithPublishedPriceQuotationsMember ifrs-full:AtFairValueMember 2021-12-31 0001033767 ifrs-full:ActuarialAssumptionOfDiscountRatesMember 2021-12-31 0001033767 ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesMember 2021-12-31 0001033767 ifrs-full:LaterThanFiveYearsAndNotLaterThanTenYearsMember 2021-12-31 0001033767 ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember 2021-12-31 0001033767 umc:NexpowerTechnologyCorpMember 2021-12-31 0001033767 umc:MachineryAndEquipment1Member 2021-12-31 0001033767 ifrs-full:Level1OfFairValueHierarchyMember 2021-12-31 0001033767 ifrs-full:Level2OfFairValueHierarchyMember 2021-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember 2021-12-31 0001033767 umc:DiscountForLackOfMarketabilityMember ifrs-full:EquityPriceRiskMember ifrs-full:MarketApproachMember umc:UnlistedEquitySecuritiesMember 2021-12-31 0001033767 ifrs-full:NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember ifrs-full:Level3OfFairValueHierarchyMember 2021-12-31 0001033767 ifrs-full:NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember ifrs-full:Level2OfFairValueHierarchyMember 2021-12-31 0001033767 ifrs-full:NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember ifrs-full:Level1OfFairValueHierarchyMember 2021-12-31 0001033767 ifrs-full:NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember 2021-12-31 0001033767 country:TW 2021-12-31 0001033767 country:SG 2021-12-31 0001033767 umc:ChinaIncludesHongKongMember 2021-12-31 0001033767 country:JP 2021-12-31 0001033767 country:US 2021-12-31 0001033767 umc:Europe1Member 2021-12-31 0001033767 umc:AllOtherCountriesMember 2021-12-31 0001033767 ifrs-full:BottomOfRangeMember 2021-12-31 0001033767 ifrs-full:TopOfRangeMember 2021-12-31 0001033767 ifrs-full:AssociatesMember 2021-12-31 0001033767 ifrs-full:OtherRelatedPartiesMember 2021-12-31 0001033767 umc:UdsMember 2021-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember umc:UMCGroupUSAMember 2021-12-31 0001033767 umc:WavetekMicroelectronicsCorporationMember umc:UMCGroupUSAMember 2021-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember 2021-12-31 0001033767 umc:UnitedSemiconductorJapanCoLtdUsjcMember umc:UMCGroupUSAMember 2021-12-31 0001033767 umc:UMCGroupUSAMember 2021-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember umc:UMCGroupUSAMember 2021-12-31 0001033767 umc:SalesOfGoodsAndServicesMember 2021-12-31 0001033767 umc:AdjustmentInLossAllowanceMember 2021-12-31 0001033767 umc:AllOtherRelatedPartiesMember 2021-12-31 0001033767 ifrs-full:EquityPriceRiskMember 2021-12-31 0001033767 ifrs-full:CurrencyRiskMember currency:JPY 2021-12-31 0001033767 umc:ChinaYuanRenminbiMember ifrs-full:CurrencyRiskMember 2021-12-31 0001033767 ifrs-full:CurrencyRiskMember umc:TaiwanDollarsMember 2021-12-31 0001033767 ifrs-full:InterestRateRiskMember 2021-12-31 0001033767 umc:AmericanDepositarySharesMember 2021-12-31 0001033767 ifrs-full:AssociatesMember umc:StockOfArteryTechnologyCorporationMember 2021-12-31 0001033767 umc:UnsecuredDomesticBondsPayableMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 umc:UnsecuredExchangeableBondsPayableMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 umc:DiscountsOnBondsPayableMember 2021-12-31 0001033767 ifrs-full:NotLaterThanOneYearMember 2021-12-31 0001033767 ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember 2021-12-31 0001033767 ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember 2021-12-31 0001033767 ifrs-full:LaterThanFiveYearsMember 2021-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember 2021-12-31 0001033767 umc:HsunChiehInvestmentCoLtdMember 2021-12-31 0001033767 umc:YannYuanInvestmentCoLtdMember 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInOctober2022Member 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInMarch2024Member 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInMarch2022Member 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInJune2024Member 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInJune2021Member 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInMarch2020Member 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInOctober2024Member 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInApril2026Member 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInApril2028Member 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInApril2031Member 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInDecember2026Member 2021-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:CustomsMember 2021-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:ScienceParkBureauMember 2021-12-31 0001033767 umc:DormitoryLeaseMember umc:RefundableDepositsTimeDepositMember umc:ScienceParkBureauMember 2021-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:LiquefiedNaturalGasBusinessDivisionCPCCorporationTaiwanMember 2021-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:BankOfChinaAndAgriculturalBankOfChinaMember 2021-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:ShanghaiCommercialBankMember 2021-12-31 0001033767 ifrs-full:BuildingsMember umc:TaiwanCooperativeBankAndSecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2021-12-31 0001033767 umc:MachineryAndEquipment1Member umc:TaiwanCooperativeBankMegaInternationalCommercialBankKGIBankFirstCommercialBankAndSecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2021-12-31 0001033767 umc:TransportationEquipmentsMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2021-12-31 0001033767 umc:FurnitureAndFixtureMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2021-12-31 0001033767 ifrs-full:RightofuseAssetsMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2021-12-31 0001033767 ifrs-full:OtherTemporaryDifferencesMember 2021-12-31 0001033767 umc:UnrealizedProfitOnIntercompanySalesMember 2021-12-31 0001033767 umc:InvestmentLossMember 2021-12-31 0001033767 umc:AllowanceForInventoryValuationLossesMember 2021-12-31 0001033767 umc:RefundLiabilitiesMember 2021-12-31 0001033767 umc:DefinedBenefitPlanMember 2021-12-31 0001033767 ifrs-full:UnusedTaxLossesMember 2021-12-31 0001033767 ifrs-full:AccumulatedDepreciationAndAmortisationMember 2021-12-31 0001033767 umc:FaradayTechnologyCorpMember 2021-12-31 0001033767 umc:UnimicronTechnologyCorpMember 2021-12-31 0001033767 umc:MTICHoldingsPteLtdMember 2021-12-31 0001033767 umc:PuriumfilIncMember 2021-12-31 0001033767 umc:UnitechCapitalIncMember 2021-12-31 0001033767 umc:TriKnightCapitalCorporationMember 2021-12-31 0001033767 umc:HsunChienCapitalCorporationMember 2021-12-31 0001033767 umc:UnitedLEDCorporationHongKongLimitedMember 2021-12-31 0001033767 umc:VSenseCoLtdMember 2021-12-31 0001033767 umc:TranslinkCapitalPartnersILPMember 2021-12-31 0001033767 umc:AmortizableAssetsMember 2021-12-31 0001033767 umc:InvestmentGainMember 2021-12-31 0001033767 ifrs-full:UnrealisedForeignExchangeGainsLossesMember 2021-12-31 0001033767 umc:BondsMember 2021-12-31 0001033767 ifrs-full:LandMember 2021-12-31 0001033767 ifrs-full:BuildingsMember 2021-12-31 0001033767 umc:MachineryAndEquipment1Member 2021-12-31 0001033767 ifrs-full:VehiclesMember 2021-12-31 0001033767 ifrs-full:OtherPropertyPlantAndEquipmentMember 2021-12-31 0001033767 ifrs-full:GoodwillMember 2021-12-31 0001033767 ifrs-full:ComputerSoftwareMember 2021-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember 2021-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember 2021-12-31 0001033767 umc:TaipeiFubonBankMember umc:UnsecuredRevolvingLoanMember 2021-12-31 0001033767 umc:ChangHwaCommercialBankMember umc:UnsecuredRevolvingLoanMember 2021-12-31 0001033767 umc:KgiCommercialBankMember umc:UnsecuredRevolvingLoanMember 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanMember 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanMember umc:YuantaCommercialBankMember 2021-12-31 0001033767 umc:AllowancesMember 2021-12-31 0001033767 ifrs-full:OrdinarySharesMember 2021-12-31 0001033767 ifrs-full:PreferenceSharesMember 2021-12-31 0001033767 umc:EmbeddedDerivativesInExchangeableBondsMember 2021-12-31 0001033767 umc:StockAppreciationRightPlanForEmployeesMember 2021-12-31 0001033767 umc:UnsecuredExchangeableBondsMember 2021-12-31 0001033767 umc:EmbeddedDerivativesInExchangeableBondsMember umc:BinomialTreeValuationModelMember umc:DerivativePriceRiskMember ifrs-full:HistoricalVolatilityForSharesMeasurementInputMember 2021-12-31 0001033767 umc:CommonSharesOfNovatekMember umc:CurrencyLinkedZeroCouponExchangeableBondsMaturingOnJuly72026Member 2021-12-31 0001033767 ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember 2019-01-01 2019-12-31 0001033767 umc:DefinedContributionPlanMember 2019-01-01 2019-12-31 0001033767 country:TW 2019-01-01 2019-12-31 0001033767 country:SG 2019-01-01 2019-12-31 0001033767 umc:ChinaIncludesHongKongMember 2019-01-01 2019-12-31 0001033767 country:JP 2019-01-01 2019-12-31 0001033767 country:US 2019-01-01 2019-12-31 0001033767 umc:Europe1Member 2019-01-01 2019-12-31 0001033767 umc:AllOtherCountriesMember 2019-01-01 2019-12-31 0001033767 ifrs-full:GoodsOrServicesTransferredAtPointInTimeMember 2019-01-01 2019-12-31 0001033767 ifrs-full:GoodsOrServicesTransferredOverTimeMember 2019-01-01 2019-12-31 0001033767 umc:UMCGroupUSAMember 2019-01-01 2019-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember umc:UMCGroupUSAMember 2019-01-01 2019-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember umc:UMCGroupJapanMember 2019-01-01 2019-12-31 0001033767 umc:UMCGroupJapanMember 2019-01-01 2019-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember umc:UMCGroupUSAMember 2019-01-01 2019-12-31 0001033767 ifrs-full:AssociatesMember 2019-01-01 2019-12-31 0001033767 ifrs-full:OtherRelatedPartiesMember 2019-01-01 2019-12-31 0001033767 umc:AllOtherRelatedPartiesMember 2019-01-01 2019-12-31 0001033767 umc:CustomerAMember umc:CustomerConcentrationRisk1Member umc:WaferFabricationSegmentMember 2019-01-01 2019-12-31 0001033767 ifrs-full:InvestmentsAccountedForUsingEquityMethodMember 2019-01-01 2019-12-31 0001033767 ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember 2019-01-01 2019-12-31 0001033767 umc:BondsPayableMember 2019-01-01 2019-12-31 0001033767 umc:GuaranteeDepositsMember 2019-01-01 2019-12-31 0001033767 umc:LongTermLoansMember 2019-01-01 2019-12-31 0001033767 ifrs-full:LeaseLiabilitiesMember 2019-01-01 2019-12-31 0001033767 ifrs-full:ShorttermBorrowingsMember 2019-01-01 2019-12-31 0001033767 umc:DefinedBenefitPlanMember 2019-01-01 2019-12-31 0001033767 umc:OperatingCostsMember 2019-01-01 2019-12-31 0001033767 umc:OperatingExpense1Member 2019-01-01 2019-12-31 0001033767 umc:WaferMember 2019-01-01 2019-12-31 0001033767 umc:OtherProductsMember 2019-01-01 2019-12-31 0001033767 umc:OtherFinancialLiabilitiesNoncurrentMember 2019-01-01 2019-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember 2019-01-01 2019-12-31 0001033767 umc:TreasuryStockPlanForEmployeesIn2018Member 2019-01-01 2019-12-31 0001033767 umc:ChinaYuanRenminbiMember ifrs-full:CurrencyRiskMember 2019-01-01 2019-12-31 0001033767 ifrs-full:CurrencyRiskMember umc:TaiwanDollarsMember 2019-01-01 2019-12-31 0001033767 ifrs-full:CurrencyRiskMember currency:JPY 2019-01-01 2019-12-31 0001033767 ifrs-full:InterestRateRiskMember 2019-01-01 2019-12-31 0001033767 ifrs-full:EquityPriceRiskMember 2019-01-01 2019-12-31 0001033767 ifrs-full:NoncontrollingInterestsMember 2019-01-01 2019-12-31 0001033767 ifrs-full:EquityAttributableToOwnersOfParentMember 2019-01-01 2019-12-31 0001033767 umc:UnappropriatedEarningsMember 2019-01-01 2019-12-31 0001033767 umc:StockOfGearRadioLtdMember ifrs-full:AssociatesMember 2019-01-01 2019-12-31 0001033767 umc:StockOfMaterialsAnalysisTechnologyIncMember ifrs-full:AssociatesMember 2019-01-01 2019-12-31 0001033767 ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember 2019-01-01 2019-12-31 0001033767 ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember 2019-01-01 2019-12-31 0001033767 ifrs-full:AdditionalPaidinCapitalMember 2019-01-01 2019-12-31 0001033767 umc:CollectedInAdvanceMember 2019-01-01 2019-12-31 0001033767 ifrs-full:TreasurySharesMember 2019-01-01 2019-12-31 0001033767 ifrs-full:IssuedCapitalMember ifrs-full:OrdinarySharesMember 2019-01-01 2019-12-31 0001033767 ifrs-full:StatutoryReserveMember 2019-01-01 2019-12-31 0001033767 umc:SpecialReserveMember 2019-01-01 2019-12-31 0001033767 ifrs-full:ReserveOfCashFlowHedgesMember 2019-01-01 2019-12-31 0001033767 umc:UnitedSemiconductorJapanCoLtdusjcMember 2019-01-01 2019-12-31 0001033767 ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember 2020-01-01 2020-12-31 0001033767 umc:OperatingCostsMember 2020-01-01 2020-12-31 0001033767 umc:OperatingExpense1Member 2020-01-01 2020-12-31 0001033767 umc:DefinedContributionPlanMember 2020-01-01 2020-12-31 0001033767 country:TW 2020-01-01 2020-12-31 0001033767 country:SG 2020-01-01 2020-12-31 0001033767 umc:ChinaIncludesHongKongMember 2020-01-01 2020-12-31 0001033767 country:JP 2020-01-01 2020-12-31 0001033767 country:US 2020-01-01 2020-12-31 0001033767 umc:Europe1Member 2020-01-01 2020-12-31 0001033767 umc:AllOtherCountriesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:GoodsOrServicesTransferredAtPointInTimeMember 2020-01-01 2020-12-31 0001033767 ifrs-full:GoodsOrServicesTransferredOverTimeMember 2020-01-01 2020-12-31 0001033767 umc:UMCGroupUSAMember 2020-01-01 2020-12-31 0001033767 umc:UMCGroupJapanMember 2020-01-01 2020-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember umc:UMCGroupUSAMember 2020-01-01 2020-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember umc:UMCGroupUSAMember 2020-01-01 2020-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember umc:UMCGroupJapanMember 2020-01-01 2020-12-31 0001033767 umc:UnitedSemiconductorJapanCoLtdUsjcMember umc:UMCGroupUSAMember 2020-01-01 2020-12-31 0001033767 ifrs-full:AssociatesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:OtherRelatedPartiesMember 2020-01-01 2020-12-31 0001033767 umc:AllOtherRelatedPartiesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:BottomOfRangeMember umc:DiscountForLackOfMarketabilityMember ifrs-full:EquityPriceRiskMember ifrs-full:MarketApproachMember umc:UnlistedEquitySecuritiesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:TopOfRangeMember ifrs-full:EquityPriceRiskMember umc:UnlistedEquitySecuritiesMember umc:DiscountForLackOfMarketabilityMember ifrs-full:MarketApproachMember 2020-01-01 2020-12-31 0001033767 umc:CustomerAMember umc:CustomerConcentrationRisk1Member umc:WaferFabricationSegmentMember 2020-01-01 2020-12-31 0001033767 ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PresentValueOfDefinedBenefitObligationMember 2020-01-01 2020-12-31 0001033767 ifrs-full:ComputerSoftwareMember ifrs-full:GrossCarryingAmountMember 2020-01-01 2020-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember ifrs-full:GrossCarryingAmountMember 2020-01-01 2020-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember ifrs-full:GrossCarryingAmountMember 2020-01-01 2020-12-31 0001033767 ifrs-full:GrossCarryingAmountMember 2020-01-01 2020-12-31 0001033767 ifrs-full:TradeReceivablesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:ConstructionInProgressMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember 2020-01-01 2020-12-31 0001033767 ifrs-full:ForwardContractMember 2020-01-01 2020-12-31 0001033767 umc:LongTermLoansMember 2020-01-01 2020-12-31 0001033767 umc:GuaranteeDepositsMember 2020-01-01 2020-12-31 0001033767 umc:BondsPayableMember 2020-01-01 2020-12-31 0001033767 ifrs-full:LeaseLiabilitiesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:ShorttermBorrowingsMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:BuildingsMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember umc:MachineryAndEquipment1Member 2020-01-01 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:VehiclesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:FixturesAndFittingsMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:LeaseholdImprovementsMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2020-01-01 2020-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-01-01 2020-12-31 0001033767 umc:UMCGroupUSAMember 2020-01-01 2020-12-31 0001033767 umc:UnitedMicroelectronicsEuropeBVMember 2020-01-01 2020-12-31 0001033767 umc:UMCCapitalCorpMember 2020-01-01 2020-12-31 0001033767 umc:GreenEarthLimitedMember 2020-01-01 2020-12-31 0001033767 umc:TLCCapitalCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:UMCInvestmentSamoaLimitedMember 2020-01-01 2020-12-31 0001033767 umc:FortuneVentureCapitalCorpMember 2020-01-01 2020-12-31 0001033767 umc:UMCKoreaCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:OmniGlobalLimitedMember 2020-01-01 2020-12-31 0001033767 umc:SinoParagonLimitedMember 2020-01-01 2020-12-31 0001033767 umc:BestEliteInternationalLimitedMember 2020-01-01 2020-12-31 0001033767 umc:UnitedSemiconductorJapanCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:WavetekMicroelectronicsCorporationMember 2020-01-01 2020-12-31 0001033767 umc:SoaringCapitalCorpMember 2020-01-01 2020-12-31 0001033767 umc:UnitruthAdvisorShanghaiCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:UnitedMicrochipCorporationMember 2020-01-01 2020-12-31 0001033767 umc:TeraEnergyDevelopmentCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:EverrichEnergyInvestmentHKLimitedMember 2020-01-01 2020-12-31 0001033767 umc:EverrichShandongEnergyCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:UnitedMicrotechnologyCorporationCaliforniaMember 2020-01-01 2020-12-31 0001033767 umc:ECPVitaPteLtdMember 2020-01-01 2020-12-31 0001033767 umc:UMCTechnologyJapanCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:WavetekMicroelectronicsInvestmentSamoaLimitedMember 2020-01-01 2020-12-31 0001033767 umc:WavetekMicroelectronicsCorporationUSAMember 2020-01-01 2020-12-31 0001033767 umc:InfoshineTechnologyLimitedMember 2020-01-01 2020-12-31 0001033767 umc:OakwoodAssociatesLimitedMember 2020-01-01 2020-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:UnitedDSSemiconductorShandongCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember 2020-01-01 2020-12-31 0001033767 ifrs-full:ComputerSoftwareMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2020-01-01 2020-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2020-01-01 2020-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2020-01-01 2020-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2020-01-01 2020-12-31 0001033767 umc:DefinedBenefitPlanMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PlanAssetsMember 2020-01-01 2020-12-31 0001033767 umc:WaferMember 2020-01-01 2020-12-31 0001033767 umc:OtherProductsMember 2020-01-01 2020-12-31 0001033767 umc:OtherFinancialLiabilitiesNoncurrentMember 2020-01-01 2020-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember 2020-01-01 2020-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:OrdinarySharesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:PreferenceSharesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember umc:FundsMember 2020-01-01 2020-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember umc:ConvertibleBondsMember 2020-01-01 2020-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2020-01-01 2020-12-31 0001033767 umc:UnlistedEquitySecuritiesMember umc:DiscountForLackOfMarketabilityMember ifrs-full:MarketApproachMember ifrs-full:EquityPriceRiskMember 2020-01-01 2020-12-31 0001033767 umc:TreasuryStockPlanForEmployeesIn2020Member 2020-01-01 2020-12-31 0001033767 umc:RestrictedStockPlanForEmployeesMember 2020-01-01 2020-12-31 0001033767 umc:StockAppreciationRightPlanForEmployeesMember 2020-01-01 2020-12-31 0001033767 umc:TreasuryStockPlanForEmployeesIn2018Member 2020-01-01 2020-12-31 0001033767 umc:TransferToEmployeesMember 2020-01-01 2020-12-31 0001033767 umc:LegalReserve1Member 2020-01-01 2020-12-31 0001033767 ifrs-full:OrdinarySharesMember ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PreferenceSharesMember ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2020-01-01 2020-12-31 0001033767 ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2020-01-01 2020-12-31 0001033767 umc:ChinaYuanRenminbiMember ifrs-full:CurrencyRiskMember 2020-01-01 2020-12-31 0001033767 ifrs-full:CurrencyRiskMember umc:TaiwanDollarsMember 2020-01-01 2020-12-31 0001033767 ifrs-full:CurrencyRiskMember currency:JPY 2020-01-01 2020-12-31 0001033767 ifrs-full:InterestRateRiskMember 2020-01-01 2020-12-31 0001033767 ifrs-full:EquityPriceRiskMember 2020-01-01 2020-12-31 0001033767 ifrs-full:NoncontrollingInterestsMember 2020-01-01 2020-12-31 0001033767 ifrs-full:EquityAttributableToOwnersOfParentMember 2020-01-01 2020-12-31 0001033767 umc:UnappropriatedEarningsMember 2020-01-01 2020-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-01-01 2020-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:VehiclesMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-01-01 2020-12-31 0001033767 umc:SpecialReserveMember 2020-01-01 2020-12-31 0001033767 umc:StockOfWellysunIncMember ifrs-full:AssociatesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember 2020-01-01 2020-12-31 0001033767 ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:LeaseholdImprovementsMember 2020-01-01 2020-12-31 0001033767 ifrs-full:TreasurySharesMember 2020-01-01 2020-12-31 0001033767 umc:UnearnedEmployeeCompensationMember 2020-01-01 2020-12-31 0001033767 ifrs-full:AdditionalPaidinCapitalMember 2020-01-01 2020-12-31 0001033767 ifrs-full:IssuedCapitalMember ifrs-full:OrdinarySharesMember 2020-01-01 2020-12-31 0001033767 umc:CollectedInAdvanceMember 2020-01-01 2020-12-31 0001033767 umc:FaradayTechnologyCorpMember 2020-01-01 2020-12-31 0001033767 umc:UnimicronTechnologyCorpMember 2020-01-01 2020-12-31 0001033767 umc:MTICHoldingsPteLtdMember 2020-01-01 2020-12-31 0001033767 umc:PuriumfilIncMember 2020-01-01 2020-12-31 0001033767 umc:UnitechCapitalIncMember 2020-01-01 2020-12-31 0001033767 umc:TriKnightCapitalCorporationMember 2020-01-01 2020-12-31 0001033767 umc:HsunChienCapitalCorporationMember 2020-01-01 2020-12-31 0001033767 umc:HsunChiehInvestmentCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:YannYuanInvestmentCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:UnitedLEDCorporationHongKongLimitedMember 2020-01-01 2020-12-31 0001033767 umc:VSenseCoLtdMember 2020-01-01 2020-12-31 0001033767 umc:TranslinkCapitalPartnersILPMember 2020-01-01 2020-12-31 0001033767 ifrs-full:StatutoryReserveMember 2020-01-01 2020-12-31 0001033767 ifrs-full:LandMember 2020-01-01 2020-12-31 0001033767 ifrs-full:BuildingsMember 2020-01-01 2020-12-31 0001033767 umc:MachineryAndEquipment1Member 2020-01-01 2020-12-31 0001033767 ifrs-full:VehiclesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:OtherPropertyPlantAndEquipmentMember 2020-01-01 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:LandMember 2020-01-01 2020-12-31 0001033767 ifrs-full:LandMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-01-01 2020-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-01-01 2020-12-31 0001033767 umc:CashDividendMember 2020-01-01 2020-12-31 0001033767 umc:UMCGroupUSAMember 2021-01-01 2021-12-31 0001033767 umc:UnitedMicroelectronicsEuropeBVMember 2021-01-01 2021-12-31 0001033767 umc:UMCCapitalCorpMember 2021-01-01 2021-12-31 0001033767 umc:GreenEarthLimitedMember 2021-01-01 2021-12-31 0001033767 umc:TLCCapitalCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:UMCInvestmentSamoaLimitedMember 2021-01-01 2021-12-31 0001033767 umc:FortuneVentureCapitalCorpMember 2021-01-01 2021-12-31 0001033767 umc:UMCKoreaCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:OmniGlobalLimitedMember 2021-01-01 2021-12-31 0001033767 umc:SinoParagonLimitedMember 2021-01-01 2021-12-31 0001033767 umc:BestEliteInternationalLimitedMember 2021-01-01 2021-12-31 0001033767 umc:UnitedSemiconductorJapanCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:WavetekMicroelectronicsCorporationMember 2021-01-01 2021-12-31 0001033767 umc:SoaringCapitalCorpMember 2021-01-01 2021-12-31 0001033767 umc:UnitruthAdvisorShanghaiCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:UnitedMicrochipCorporationMember 2021-01-01 2021-12-31 0001033767 umc:TeraEnergyDevelopmentCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:EverrichEnergyInvestmentHKLimitedMember 2021-01-01 2021-12-31 0001033767 umc:EverrichShandongEnergyCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:UnitedMicrotechnologyCorporationCaliforniaMember 2021-01-01 2021-12-31 0001033767 umc:ECPVitaPteLtdMember 2021-01-01 2021-12-31 0001033767 umc:UMCTechnologyJapanCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:WavetekMicroelectronicsInvestmentSamoaLimitedMember 2021-01-01 2021-12-31 0001033767 umc:WavetekMicroelectronicsCorporationUSAMember 2021-01-01 2021-12-31 0001033767 umc:InfoshineTechnologyLimitedMember 2021-01-01 2021-12-31 0001033767 umc:OakwoodAssociatesLimitedMember 2021-01-01 2021-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:UnitedDSSemiconductorShandongCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BottomOfRangeMember ifrs-full:ComputerSoftwareMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TopOfRangeMember ifrs-full:ComputerSoftwareMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BottomOfRangeMember ifrs-full:TechnologybasedIntangibleAssetsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TopOfRangeMember ifrs-full:TechnologybasedIntangibleAssetsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember 2021-01-01 2021-12-31 0001033767 umc:OperatingCostsMember 2021-01-01 2021-12-31 0001033767 umc:OperatingExpense1Member 2021-01-01 2021-12-31 0001033767 umc:DefinedContributionPlanMember 2021-01-01 2021-12-31 0001033767 ifrs-full:NotLaterThanOneYearMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LaterThanFiveYearsMember 2021-01-01 2021-12-31 0001033767 country:TW 2021-01-01 2021-12-31 0001033767 country:SG 2021-01-01 2021-12-31 0001033767 umc:ChinaIncludesHongKongMember 2021-01-01 2021-12-31 0001033767 country:JP 2021-01-01 2021-12-31 0001033767 country:US 2021-01-01 2021-12-31 0001033767 umc:Europe1Member 2021-01-01 2021-12-31 0001033767 umc:AllOtherCountriesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:GoodsOrServicesTransferredAtPointInTimeMember 2021-01-01 2021-12-31 0001033767 ifrs-full:GoodsOrServicesTransferredOverTimeMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BottomOfRangeMember 2021-01-01 2021-12-31 0001033767 umc:UMCGroupUSAMember 2021-01-01 2021-12-31 0001033767 umc:UnitedSemiconductorJapanCoLtdUsjcMember umc:UMCGroupUSAMember 2021-01-01 2021-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember umc:UMCGroupUSAMember 2021-01-01 2021-12-31 0001033767 umc:WavetekMicroelectronicsCorporationMember umc:UMCGroupUSAMember 2021-01-01 2021-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember umc:UMCGroupUSAMember 2021-01-01 2021-12-31 0001033767 umc:UdsMember 2021-01-01 2021-12-31 0001033767 umc:UMCMember umc:WavetekMicroelectronicsCorporationMember 2021-01-01 2021-12-31 0001033767 ifrs-full:AssociatesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:OtherRelatedPartiesMember 2021-01-01 2021-12-31 0001033767 umc:AllOtherRelatedPartiesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BottomOfRangeMember ifrs-full:CountryOfDomicileMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TopOfRangeMember ifrs-full:CountryOfDomicileMember 2021-01-01 2021-12-31 0001033767 ifrs-full:ForeignCountriesMember ifrs-full:BottomOfRangeMember 2021-01-01 2021-12-31 0001033767 ifrs-full:ForeignCountriesMember ifrs-full:TopOfRangeMember 2021-01-01 2021-12-31 0001033767 ifrs-full:EquityPriceRiskMember umc:UnlistedEquitySecuritiesMember umc:DiscountForLackOfMarketabilityMember ifrs-full:MarketApproachMember ifrs-full:BottomOfRangeMember 2021-01-01 2021-12-31 0001033767 ifrs-full:EquityPriceRiskMember umc:UnlistedEquitySecuritiesMember umc:DiscountForLackOfMarketabilityMember ifrs-full:MarketApproachMember ifrs-full:TopOfRangeMember 2021-01-01 2021-12-31 0001033767 umc:CustomerConcentrationRisk1Member umc:WaferFabricationSegmentMember umc:CustomerAMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TopOfRangeMember ifrs-full:FixturesAndFittingsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BottomOfRangeMember ifrs-full:FixturesAndFittingsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TopOfRangeMember ifrs-full:VehiclesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BottomOfRangeMember ifrs-full:VehiclesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TopOfRangeMember umc:MachineryAndEquipment1Member 2021-01-01 2021-12-31 0001033767 ifrs-full:BottomOfRangeMember umc:MachineryAndEquipment1Member 2021-01-01 2021-12-31 0001033767 ifrs-full:TopOfRangeMember ifrs-full:BuildingsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BottomOfRangeMember ifrs-full:BuildingsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TopOfRangeMember 2021-01-01 2021-12-31 0001033767 ifrs-full:InvestmentsAccountedForUsingEquityMethodMember 2021-01-01 2021-12-31 0001033767 ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:PresentValueOfDefinedBenefitObligationMember 2021-01-01 2021-12-31 0001033767 ifrs-full:GoodwillMember ifrs-full:GrossCarryingAmountMember 2021-01-01 2021-12-31 0001033767 ifrs-full:ComputerSoftwareMember ifrs-full:GrossCarryingAmountMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember ifrs-full:GrossCarryingAmountMember 2021-01-01 2021-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember ifrs-full:GrossCarryingAmountMember 2021-01-01 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TradeReceivablesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LandMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:VehiclesMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LeaseholdImprovementsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:ConstructionInProgressMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 umc:NexpowerTechnologyCorpMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LeaseLiabilitiesMember 2021-01-01 2021-12-31 0001033767 umc:GuaranteeDepositsMember 2021-01-01 2021-12-31 0001033767 umc:BondsPayableMember 2021-01-01 2021-12-31 0001033767 ifrs-full:ShorttermBorrowingsMember 2021-01-01 2021-12-31 0001033767 umc:LongTermLoansMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LandMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:VehiclesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LeaseholdImprovementsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:ConstructionInProgressMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LandMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:GoodwillMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-01-01 2021-12-31 0001033767 ifrs-full:ComputerSoftwareMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-01-01 2021-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-01-01 2021-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-01-01 2021-12-31 0001033767 umc:DefinedBenefitPlanMember 2021-01-01 2021-12-31 0001033767 ifrs-full:PlanAssetsMember 2021-01-01 2021-12-31 0001033767 umc:WaferMember 2021-01-01 2021-12-31 0001033767 umc:OtherProductsMember 2021-01-01 2021-12-31 0001033767 umc:OtherFinancialLiabilitiesNoncurrentMember 2021-01-01 2021-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember 2021-01-01 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:OrdinarySharesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:PreferenceSharesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember umc:FundsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember umc:ConvertibleBondsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2021-01-01 2021-12-31 0001033767 ifrs-full:OrdinarySharesMember ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2021-01-01 2021-12-31 0001033767 ifrs-full:PreferenceSharesMember ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2021-01-01 2021-12-31 0001033767 ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2021-01-01 2021-12-31 0001033767 umc:UnlistedEquitySecuritiesMember umc:DiscountForLackOfMarketabilityMember ifrs-full:MarketApproachMember ifrs-full:EquityPriceRiskMember 2021-01-01 2021-12-31 0001033767 ifrs-full:SubsidiariesMember 2021-01-01 2021-12-31 0001033767 umc:TreasuryStockPlanForEmployeesIn2020Member 2021-01-01 2021-12-31 0001033767 umc:RestrictedStockPlanForEmployeesMember 2021-01-01 2021-12-31 0001033767 umc:StockAppreciationRightPlanForEmployeesMember 2021-01-01 2021-12-31 0001033767 umc:LegalReserve1Member 2021-01-01 2021-12-31 0001033767 ifrs-full:CurrencyRiskMember umc:TaiwanDollarsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:CurrencyRiskMember currency:JPY 2021-01-01 2021-12-31 0001033767 umc:ChinaYuanRenminbiMember ifrs-full:CurrencyRiskMember 2021-01-01 2021-12-31 0001033767 ifrs-full:InterestRateRiskMember 2021-01-01 2021-12-31 0001033767 ifrs-full:EquityPriceRiskMember 2021-01-01 2021-12-31 0001033767 umc:UnappropriatedEarningsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:NoncontrollingInterestsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:EquityAttributableToOwnersOfParentMember 2021-01-01 2021-12-31 0001033767 umc:SecuredLongtermLoanFromMegaInternationalCommercialBank1Member 2021-01-01 2021-12-31 0001033767 umc:SecuredLongtermLoanFromTaiwanCooperativeBank2Member 2021-01-01 2021-12-31 0001033767 umc:SecuredLongtermLoanFromTaiwanCooperativeBank3Member 2021-01-01 2021-12-31 0001033767 umc:SecuredLongtermLoanFromTaiwanCooperativeBank4Member 2021-01-01 2021-12-31 0001033767 umc:SecuredLongtermLoanFromTaiwanCooperativeBank5Member 2021-01-01 2021-12-31 0001033767 umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2021-01-01 2021-12-31 0001033767 umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6Others2Member 2021-01-01 2021-12-31 0001033767 umc:UnsecuredLongtermLoanFromIcbcBankMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredLongtermLoanFromXiamenBankMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredLongtermLoanFromBankOfChinaMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredLongTermLoanFromBankOfTaiwanMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredLongtermLoanFromTaiwanCooperativeBankMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromMegaInternationalCommercialBankNoteBMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromTaipeiFubonBankNoteCMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromChangHwaCommercialBankNoteDMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromKgiBankNoteEMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromFirstCommercialBank1NoteFMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromFirstCommercialBank2NoteGMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromFirstCommercialBank3NoteGMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromFirstCommercialBank4NoteGMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromYuantaCommercialBankNoteHMember 2021-01-01 2021-12-31 0001033767 umc:SecuredLongtermLoanFromTaiwanCooperativeBank1Member 2021-01-01 2021-12-31 0001033767 umc:SecuredLongtermLoanFromMegaInternationalCommercialBank2Member 2021-01-01 2021-12-31 0001033767 umc:SecuredLongtermLoanFromFirstCommercialBankMember 2021-01-01 2021-12-31 0001033767 umc:SecuredLongtermLoanFromKgiBankMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredLongtermLoanFromBankOfTaiwan2Member 2021-01-01 2021-12-31 0001033767 umc:UnsecuredRevolvingLoanFromKgiBank2NoteEMember 2021-01-01 2021-12-31 0001033767 umc:SpecialReserveMember 2021-01-01 2021-12-31 0001033767 umc:StockOfArteryTechnologyCorporationMember ifrs-full:AssociatesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember 2021-01-01 2021-12-31 0001033767 ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember 2021-01-01 2021-12-31 0001033767 ifrs-full:RecurringFairValueMeasurementMember 2021-01-01 2021-12-31 0001033767 ifrs-full:NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LandMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-01-01 2021-12-31 0001033767 umc:UnearnedEmployeeCompensationMember 2021-01-01 2021-12-31 0001033767 ifrs-full:AdditionalPaidinCapitalMember 2021-01-01 2021-12-31 0001033767 ifrs-full:IssuedCapitalMember ifrs-full:OrdinarySharesMember 2021-01-01 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInMarch2020Member 2021-01-01 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInOctober2024Member 2021-01-01 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInApril2026Member 2021-01-01 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInApril2028Member 2021-01-01 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInJune2021Member 2021-01-01 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInJune2024Member 2021-01-01 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInMarch2022Member 2021-01-01 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInMarch2024Member 2021-01-01 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInOctober2022Member 2021-01-01 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInApril2031Member 2021-01-01 2021-12-31 0001033767 umc:DomesticUnsecuredCorporateBondsMaturingInDecember2026Member 2021-01-01 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember 2021-01-01 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TreasurySharesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:RightofuseAssetsMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2021-01-01 2021-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:LiquefiedNaturalGasBusinessDivisionCPCCorporationTaiwanMember 2021-01-01 2021-12-31 0001033767 umc:CustomsMember umc:RefundableDepositsTimeDepositMember 2021-01-01 2021-12-31 0001033767 umc:ScienceParkBureauMember umc:RefundableDepositsTimeDepositMember 2021-01-01 2021-12-31 0001033767 umc:ScienceParkBureauMember umc:RefundableDepositsTimeDepositMember umc:DormitoryLeaseMember 2021-01-01 2021-12-31 0001033767 umc:FurnitureAndFixtureMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2021-01-01 2021-12-31 0001033767 umc:TransportationEquipmentsMember umc:SecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2021-01-01 2021-12-31 0001033767 umc:MachineryAndEquipment1Member umc:TaiwanCooperativeBankMegaInternationalCommercialBankKGIBankFirstCommercialBankAndSecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BuildingsMember umc:TaiwanCooperativeBankAndSecuredSyndicatedLoansFromChinaDevelopmentBankAnd6OthersMember 2021-01-01 2021-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:ShanghaiCommercialBankMember 2021-01-01 2021-12-31 0001033767 umc:RefundableDepositsTimeDepositMember umc:BankOfChinaAndAgriculturalBankOfChinaMember 2021-01-01 2021-12-31 0001033767 umc:FaradayTechnologyCorpMember 2021-01-01 2021-12-31 0001033767 umc:UnimicronTechnologyCorpMember 2021-01-01 2021-12-31 0001033767 umc:MTICHoldingsPteLtdMember 2021-01-01 2021-12-31 0001033767 umc:PuriumfilIncMember 2021-01-01 2021-12-31 0001033767 umc:UnitechCapitalIncMember 2021-01-01 2021-12-31 0001033767 umc:TriKnightCapitalCorporationMember 2021-01-01 2021-12-31 0001033767 umc:HsunChienCapitalCorporationMember 2021-01-01 2021-12-31 0001033767 umc:HsunChiehInvestmentCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:YannYuanInvestmentCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:UnitedLEDCorporationHongKongLimitedMember 2021-01-01 2021-12-31 0001033767 umc:VSenseCoLtdMember 2021-01-01 2021-12-31 0001033767 umc:TranslinkCapitalPartnersILPMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LaterThanOneYearMember 2021-01-01 2021-12-31 0001033767 ifrs-full:StatutoryReserveMember 2021-01-01 2021-12-31 0001033767 dei:BusinessContactMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LandMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BuildingsMember 2021-01-01 2021-12-31 0001033767 umc:MachineryAndEquipment1Member 2021-01-01 2021-12-31 0001033767 ifrs-full:VehiclesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:OtherPropertyPlantAndEquipmentMember 2021-01-01 2021-12-31 0001033767 ifrs-full:LeaseholdImprovementsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:UnusedTaxCreditsMember 2021-01-01 2021-12-31 0001033767 umc:CashDividendMember 2021-01-01 2021-12-31 0001033767 umc:StockAppreciationRightPlanForEmployeesMember umc:GrantedInSeptember2020Member 2021-01-01 2021-12-31 0001033767 umc:StockAppreciationRightPlanForEmployeesMember umc:GrantedInJune2021Member 2021-01-01 2021-12-31 0001033767 ifrs-full:BottomOfRangeMember umc:GrantedInSeptember2020Member umc:StockAppreciationRightPlanForEmployeesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TopOfRangeMember umc:GrantedInSeptember2020Member umc:StockAppreciationRightPlanForEmployeesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BottomOfRangeMember umc:GrantedInJune2021Member umc:StockAppreciationRightPlanForEmployeesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:TopOfRangeMember umc:GrantedInJune2021Member umc:StockAppreciationRightPlanForEmployeesMember 2021-01-01 2021-12-31 0001033767 umc:UnsecuredExchangeableBondsMember 2021-01-01 2021-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember ifrs-full:DerivativesMember 2021-01-01 2021-12-31 0001033767 ifrs-full:HistoricalVolatilityForSharesMeasurementInputMember umc:BinomialTreeValuationModelMember umc:EmbeddedDerivativesInExchangeableBondsMember 2021-01-01 2021-12-31 0001033767 umc:EmbeddedDerivativesInExchangeableBondsMember umc:BinomialTreeValuationModelMember umc:DerivativePriceRiskMember ifrs-full:HistoricalVolatilityForSharesMeasurementInputMember 2021-01-01 2021-12-31 0001033767 umc:RestrictedStocksMember 2021-01-01 2021-12-31 0001033767 ifrs-full:BuildingsMember 2020-07-01 2020-09-30 0001033767 umc:CurrencyLinkedZeroCouponConvertibleBondsMaturingOnMay182020Member 2020-05-18 2020-05-18 0001033767 umc:CurrencyLinkedZeroCouponConvertibleBondsMaturingOnMay182020Member 2020-05-18 0001033767 umc:CurrencyLinkedZeroCouponExchangeableBondsMaturingOnJuly72026Member 2021-07-07 2021-07-07 0001033767 umc:CurrencyLinkedZeroCouponExchangeableBondsMaturingOnJuly72026Member umc:CommonSharesOfNovatekMember 2021-07-07 2021-07-07 0001033767 ifrs-full:BottomOfRangeMember umc:CurrencyLinkedZeroCouponExchangeableBondsMaturingOnJuly72026Member 2021-07-07 2021-07-07 0001033767 umc:TreasuryStockPlanForEmployeesIn2018Member 2018-08-01 2018-08-31 0001033767 ifrs-full:TopOfRangeMember umc:TreasuryStockPlanForEmployeesIn2018Member 2018-08-01 2018-08-31 0001033767 ifrs-full:BottomOfRangeMember umc:TreasuryStockPlanForEmployeesIn2018Member 2018-08-01 2018-08-31 0001033767 umc:TreasuryStockPlanForEmployeesIn2020Member 2020-09-01 2020-09-30 0001033767 umc:StockAppreciationRightPlanForEmployeesMember 2020-09-01 2020-09-30 0001033767 umc:RestrictedStockPlanForEmployeesMember 2020-06-10 2020-06-10 0001033767 umc:RestrictedStockPlanForEmployeesMember 2020-09-01 2020-09-01 0001033767 umc:RestrictedStocksMember 2020-09-01 2020-09-01 0001033767 umc:RestrictedStockPlanForEmployeesMember 2021-06-09 2021-06-09 0001033767 umc:RestrictedStocksMember 2021-06-09 2021-06-09 0001033767 umc:StockAppreciationRightPlanForEmployeesMember 2021-06-01 2021-06-30 0001033767 umc:SalesOfGoodsAndServicesMember 2020-01-01 0001033767 umc:AdjustmentInLossAllowanceMember 2020-01-01 0001033767 umc:UnitedSemiconductorJapanCoLtdusjcMember 2019-10-01 2019-10-01 0001033767 ifrs-full:ForwardContractMember 2019-10-01 2019-10-01 0001033767 ifrs-full:ForwardContractMember 2019-10-01 0001033767 umc:MieFujitsuSemiconductorLimitedMifsMember 2019-10-01 0001033767 umc:UnitedSemiconductorJapanCoLtdusjcMember 2019-10-01 0001033767 ifrs-full:BottomOfRangeMember 2019-12-31 0001033767 ifrs-full:TopOfRangeMember 2019-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember 2019-12-31 0001033767 umc:UMCGroupJapanMember 2019-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember umc:UMCGroupUSAMember 2019-12-31 0001033767 umc:HejianTechnologySuzhouCoLtdMember umc:UMCGroupJapanMember 2019-12-31 0001033767 umc:UnitedSemiconductorXiamenCoLtdMember umc:UMCGroupUSAMember 2019-12-31 0001033767 umc:UMCGroupUSAMember 2019-12-31 0001033767 ifrs-full:EquityPriceRiskMember 2019-12-31 0001033767 ifrs-full:CurrencyRiskMember currency:JPY 2019-12-31 0001033767 umc:ChinaYuanRenminbiMember ifrs-full:CurrencyRiskMember 2019-12-31 0001033767 ifrs-full:CurrencyRiskMember umc:TaiwanDollarsMember 2019-12-31 0001033767 ifrs-full:InterestRateRiskMember 2019-12-31 0001033767 ifrs-full:AssociatesMember umc:StockOfMaterialsAnalysisTechnologyIncMember 2019-12-31 0001033767 ifrs-full:AssociatesMember umc:StockOfGearRadioLtdMember 2019-12-31 0001033767 ifrs-full:AssociatesMember 2019-12-31 0001033767 ifrs-full:ForwardContractMember 2018-12-31 0001033767 umc:CurrencyLinkedZeroCouponConvertibleBondsMaturingOnMay182020Member 2015-05-18 0001033767 ifrs-full:BottomOfRangeMember umc:CurrencyLinkedZeroCouponConvertibleBondsMaturingOnMay182020Member 2015-05-18 2015-05-18 0001033767 umc:CurrencyLinkedZeroCouponConvertibleBondsMaturingOnMay182020Member 2015-05-18 2015-05-18 0001033767 umc:CurrencyLinkedZeroCouponExchangeableBondsMaturingOnJuly72026Member 2021-07-07 0001033767 umc:CommonSharesOfNovatekMember umc:CurrencyLinkedZeroCouponExchangeableBondsMaturingOnJuly72026Member 2021-07-07 0001033767 umc:CurrencyLinkedZeroCouponExchangeableBondsMaturingOnJuly72026Member 2024-07-07 2024-07-07 0001033767 umc:MicronTechnologyMember umc:IntellecutalPropertyAndCommercialCourtMember umc:FinalDecisionByTheAuthorityMember 2022-01-27 0001033767 umc:MicronTechnologyMember umc:FinalDecisionByTheAuthorityMember umc:IntellecutalPropertyAndCommercialCourtMember 2022-01-27 2022-01-27 0001033767 umc:PlaintiffsMember 2021-05-03 2021-05-03 0001033767 umc:ChipBondTechnologyCorporationMember 2021-11-05 0001033767 umc:ChipBondTechnologyCorporationMember 2021-11-05 2021-11-05 0001033767 umc:ChipBondTechnologyCorporationMember 2021-11-05 2021-11-05 0001033767 umc:ChipBondTechnologyCorporationMember umc:FortuneVentureCapitalCorpMember 2021-11-05 2021-11-05 0001033767 umc:MegaInternationalCommercialBankMember umc:UnsecuredRevolvingLoanMember 2016-10-17 2016-10-17 0001033767 umc:MegaInternationalCommercialBankMember umc:UnsecuredRevolvingLoanMember 2016-10-17 0001033767 umc:UnsecuredRevolvingLoanMember umc:TaipeiFubonBankMember 2018-02-09 2018-02-09 0001033767 umc:TaipeiFubonBankMember umc:UnsecuredRevolvingLoanMember 2018-02-09 0001033767 umc:KgiCommercialBankMember umc:UnsecuredRevolvingLoanMember 2018-09-11 0001033767 umc:KgiCommercialBankMember umc:UnsecuredRevolvingLoanMember 2018-09-11 2018-09-11 0001033767 umc:KgiCommercialBankMember umc:UnsecuredRevolvingLoanMember 2021-05-10 0001033767 umc:UnsecuredRevolvingLoanMember 2019-12-30 2019-12-30 0001033767 umc:UnsecuredRevolvingLoanMember 2021-01-18 2021-01-18 0001033767 umc:YuantaCommercialBankMember umc:UnsecuredRevolvingLoanMember 2021-03-03 2021-03-03 0001033767 umc:YuantaCommercialBankMember umc:UnsecuredRevolvingLoanMember 2021-03-03 0001033767 umc:RestrictedStocksMember 2021-06-09 0001033767 umc:RestrictedStocksMember 2020-09-01 0001033767 umc:FortuneVentureCapitalCorpMember umc:ChipBondTechnologyCorporationMember 2021-09-03 2021-09-03 0001033767 umc:CurrencyLinkedZeroCouponConvertibleBondsMaturingOnMay182020Member 2018-05-18 2018-05-18 0001033767 umc:UnsecuredRevolvingLoanMember 2021-01-18 0001033767 umc:ChangHwaCommercialBankMember umc:UnsecuredRevolvingLoanMember 2016-11-02 2016-11-02 0001033767 umc:ChangHwaCommercialBankMember umc:UnsecuredRevolvingLoanMember 2016-11-02 0001033767 umc:StockAppreciationRightPlanForEmployeesMember 2020-09-30 2020-09-30 0001033767 umc:StockAppreciationRightPlanForEmployeesMember 2021-06-30 2021-06-30 0001033767 umc:EventsAfterReportingPeriodMember umc:UnitedSemiconductorXiamenCoLtdMember 2022-04-27 0001033767 ifrs-full:IssuedCapitalMember ifrs-full:OrdinarySharesMember 2018-12-31 0001033767 ifrs-full:AdditionalPaidinCapitalMember 2018-12-31 0001033767 ifrs-full:StatutoryReserveMember 2018-12-31 0001033767 umc:UnappropriatedEarningsMember 2018-12-31 0001033767 ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember 2018-12-31 0001033767 ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember 2018-12-31 0001033767 ifrs-full:ReserveOfCashFlowHedgesMember 2018-12-31 0001033767 ifrs-full:TreasurySharesMember 2018-12-31 0001033767 ifrs-full:EquityAttributableToOwnersOfParentMember 2018-12-31 0001033767 ifrs-full:NoncontrollingInterestsMember 2018-12-31 0001033767 ifrs-full:ShorttermBorrowingsMember 2018-12-31 0001033767 umc:OtherFinancialLiabilitiesNoncurrentMember 2018-12-31 0001033767 ifrs-full:LeaseLiabilitiesMember 2018-12-31 0001033767 umc:LongTermLoansMember 2018-12-31 0001033767 umc:GuaranteeDepositsMember 2018-12-31 0001033767 umc:BondsPayableMember 2018-12-31 0001033767 umc:GuaranteeDepositsMember 2019-12-31 0001033767 umc:OtherFinancialLiabilitiesNoncurrentMember 2019-12-31 0001033767 ifrs-full:LeaseLiabilitiesMember 2019-12-31 0001033767 umc:LongTermLoansMember 2019-12-31 0001033767 umc:BondsPayableMember 2019-12-31 0001033767 ifrs-full:ShorttermBorrowingsMember 2019-12-31 0001033767 ifrs-full:IssuedCapitalMember ifrs-full:OrdinarySharesMember 2019-12-31 0001033767 umc:CollectedInAdvanceMember 2019-12-31 0001033767 ifrs-full:AdditionalPaidinCapitalMember 2019-12-31 0001033767 ifrs-full:StatutoryReserveMember 2019-12-31 0001033767 umc:SpecialReserveMember 2019-12-31 0001033767 umc:UnappropriatedEarningsMember 2019-12-31 0001033767 ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember 2019-12-31 0001033767 ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember 2019-12-31 0001033767 ifrs-full:TreasurySharesMember 2019-12-31 0001033767 ifrs-full:EquityAttributableToOwnersOfParentMember 2019-12-31 0001033767 ifrs-full:NoncontrollingInterestsMember 2019-12-31 0001033767 umc:UnearnedEmployeeCompensationMember 2019-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:LandMember 2019-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:BuildingsMember 2019-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember umc:MachineryAndEquipment1Member 2019-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:VehiclesMember 2019-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:FixturesAndFittingsMember 2019-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:LeaseholdImprovementsMember 2019-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:ConstructionInProgressMember 2019-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember 2019-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2019-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:VehiclesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:LeaseholdImprovementsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:LandMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2019-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2019-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2019-12-31 0001033767 ifrs-full:TradeReceivablesMember 2019-12-31 0001033767 ifrs-full:GoodwillMember ifrs-full:GrossCarryingAmountMember 2019-12-31 0001033767 ifrs-full:ComputerSoftwareMember ifrs-full:GrossCarryingAmountMember 2019-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember ifrs-full:GrossCarryingAmountMember 2019-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember ifrs-full:GrossCarryingAmountMember 2019-12-31 0001033767 ifrs-full:GrossCarryingAmountMember 2019-12-31 0001033767 ifrs-full:GoodwillMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2019-12-31 0001033767 ifrs-full:ComputerSoftwareMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2019-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2019-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2019-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2019-12-31 0001033767 ifrs-full:PresentValueOfDefinedBenefitObligationMember 2019-12-31 0001033767 ifrs-full:PlanAssetsMember 2019-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:OrdinarySharesMember 2019-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:PreferenceSharesMember 2019-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember umc:FundsMember 2019-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember umc:ConvertibleBondsMember 2019-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2019-12-31 0001033767 ifrs-full:OrdinarySharesMember ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2019-12-31 0001033767 ifrs-full:PreferenceSharesMember ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2019-12-31 0001033767 ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2019-12-31 0001033767 ifrs-full:TradeReceivablesMember 2020-12-31 0001033767 umc:TransferToEmployeesMember 2019-12-31 0001033767 umc:GuaranteeDepositsMember 2020-12-31 0001033767 ifrs-full:ShorttermBorrowingsMember 2020-12-31 0001033767 umc:LongTermLoansMember 2020-12-31 0001033767 umc:BondsPayableMember 2020-12-31 0001033767 umc:OtherFinancialLiabilitiesNoncurrentMember 2020-12-31 0001033767 ifrs-full:LeaseLiabilitiesMember 2020-12-31 0001033767 umc:TransferToEmployeesMember 2020-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:OrdinarySharesMember 2020-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:PreferenceSharesMember 2020-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember umc:FundsMember 2020-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember umc:ConvertibleBondsMember 2020-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2020-12-31 0001033767 ifrs-full:OrdinarySharesMember ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2020-12-31 0001033767 ifrs-full:PreferenceSharesMember ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2020-12-31 0001033767 ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:LandMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:BuildingsMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember umc:MachineryAndEquipment1Member 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:VehiclesMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:FixturesAndFittingsMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:LeaseholdImprovementsMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember ifrs-full:ConstructionInProgressMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:VehiclesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:LeaseholdImprovementsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:LandMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:BuildingsMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember umc:MachineryAndEquipment1Member 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:VehiclesMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:FixturesAndFittingsMember 2020-12-31 0001033767 ifrs-full:LeaseholdImprovementsMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:ConstructionInProgressMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:LandMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:LandMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2020-12-31 0001033767 ifrs-full:GoodwillMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:ComputerSoftwareMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember ifrs-full:GrossCarryingAmountMember 2020-12-31 0001033767 ifrs-full:GoodwillMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2020-12-31 0001033767 ifrs-full:ComputerSoftwareMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2020-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2020-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2020-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2020-12-31 0001033767 umc:CollectedInAdvanceMember 2020-12-31 0001033767 ifrs-full:IssuedCapitalMember ifrs-full:OrdinarySharesMember 2020-12-31 0001033767 ifrs-full:AdditionalPaidinCapitalMember 2020-12-31 0001033767 ifrs-full:StatutoryReserveMember 2020-12-31 0001033767 umc:SpecialReserveMember 2020-12-31 0001033767 umc:UnappropriatedEarningsMember 2020-12-31 0001033767 ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember 2020-12-31 0001033767 ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember 2020-12-31 0001033767 umc:UnearnedEmployeeCompensationMember 2020-12-31 0001033767 ifrs-full:TreasurySharesMember 2020-12-31 0001033767 ifrs-full:EquityAttributableToOwnersOfParentMember 2020-12-31 0001033767 ifrs-full:NoncontrollingInterestsMember 2020-12-31 0001033767 ifrs-full:PlanAssetsMember 2020-12-31 0001033767 ifrs-full:PresentValueOfDefinedBenefitObligationMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:LandMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:ConstructionInProgressMember 2020-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:LandMember 2020-12-31 0001033767 ifrs-full:TradeReceivablesMember 2021-12-31 0001033767 umc:GuaranteeDepositsMember 2021-12-31 0001033767 ifrs-full:ShorttermBorrowingsMember 2021-12-31 0001033767 umc:OtherFinancialLiabilitiesNoncurrentMember 2021-12-31 0001033767 ifrs-full:LeaseLiabilitiesMember 2021-12-31 0001033767 umc:BondsPayableMember 2021-12-31 0001033767 umc:LongTermLoansMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:OrdinarySharesMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:PreferenceSharesMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember umc:FundsMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember umc:ConvertibleBondsMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2021-12-31 0001033767 ifrs-full:OrdinarySharesMember ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2021-12-31 0001033767 ifrs-full:PreferenceSharesMember ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2021-12-31 0001033767 ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember ifrs-full:Level3OfFairValueHierarchyMember 2021-12-31 0001033767 ifrs-full:LandMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:VehiclesMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:LandMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:BuildingsMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember umc:MachineryAndEquipment1Member 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:FixturesAndFittingsMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-12-31 0001033767 ifrs-full:LandMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:LeaseholdImprovementsMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:ConstructionInProgressMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:LandMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:BuildingsMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember umc:MachineryAndEquipment1Member 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:VehiclesMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:FixturesAndFittingsMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:LeaseholdImprovementsMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember ifrs-full:ConstructionInProgressMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-12-31 0001033767 ifrs-full:LandMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:BuildingsMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 umc:MachineryAndEquipment1Member ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:VehiclesMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:FixturesAndFittingsMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:LeaseholdImprovementsMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:ConstructionInProgressMember ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:PropertyPlantAndEquipmentNotSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:LandMember ifrs-full:GrossCarryingAmountMember ifrs-full:PropertyPlantAndEquipmentSubjectToOperatingLeasesMember 2021-12-31 0001033767 ifrs-full:GoodwillMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-12-31 0001033767 ifrs-full:ComputerSoftwareMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-12-31 0001033767 ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember 2021-12-31 0001033767 ifrs-full:GoodwillMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:ComputerSoftwareMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:TechnologybasedIntangibleAssetsMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:OtherIntangibleAssetsMember ifrs-full:GrossCarryingAmountMember 2021-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember ifrs-full:DerivativesMember 2020-12-31 0001033767 ifrs-full:Level3OfFairValueHierarchyMember ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember ifrs-full:DerivativesMember 2021-12-31 0001033767 umc:SpecialReserveMember 2021-12-31 0001033767 umc:UnappropriatedEarningsMember 2021-12-31 0001033767 ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember 2021-12-31 0001033767 ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember 2021-12-31 0001033767 umc:UnearnedEmployeeCompensationMember 2021-12-31 0001033767 ifrs-full:TreasurySharesMember 2021-12-31 0001033767 ifrs-full:EquityAttributableToOwnersOfParentMember 2021-12-31 0001033767 ifrs-full:NoncontrollingInterestsMember 2021-12-31 0001033767 ifrs-full:OrdinarySharesMember ifrs-full:IssuedCapitalMember 2021-12-31 0001033767 ifrs-full:AdditionalPaidinCapitalMember 2021-12-31 0001033767 ifrs-full:StatutoryReserveMember 2021-12-31 0001033767 ifrs-full:PlanAssetsMember 2021-12-31 0001033767 ifrs-full:PresentValueOfDefinedBenefitObligationMember 2021-12-31 iso4217:TWD iso4217:USD iso4217:CNY xbrli:pure xbrli:shares iso4217:JPY utr:Year iso4217:TWD xbrli:shares umc:Exchange_Rate iso4217:USD xbrli:shares umc:Right utr:Y
 
 
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
 
 
FORM
20-F
 
 
(Mark One)
REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934
OR
 
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 2021
OR
 
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
OR
 
SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
Date of event requiring this shell company report
    
    
        
    
For the transition period from
    
    
        
    
to
                    
Commission file number
001-15128
 
 
United Microelectronics Corporation
(Exact name of Registrant as specified in its charter)
 
 
N/A
(Translation of Registrant’s name into English)
Taiwan, Republic of China
(Jurisdiction of incorporation or organization)
No. 3
Li-Hsin
Road II
, Hsinchu Science Park,
Hsinchu City, Taiwan, Republic of China
(Address of principal executive offices)
Chitung Liu, Senior Vice President & Chief Financial Officer
Telephone:
+886-2-2658-9168
/ Email: ir@umc.com
8F, No. 68, Section 1, Neihu Road., Taipei 11493, Taiwan R.O.C.
(Name, Telephone,
E-mail
and/or Facsimile number and Address of Company Contact Person)
Securities registered or to be registered pursuant to Section 12(b) of the Act.
 
Title of each class
 
Trading Symbol(s)
 
Name of each exchange on which registered
American Depositary Shares, each representing 5 Common Shares
 
UMC
 
New York Stock Exchange
Securities registered or to be registered pursuant to Section 12(g) of the Act.
None
(Title of Class)
Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act.
None
(Title of Class)
 
 
Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report.
12,483,247,566 Common Shares of Registrant issued and outstanding as of December 31, 2021
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.     Yes  ☒    No  ☐
If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.     Yes  ☐     No  ☒
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes  ☒     No  ☐
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation
S-T
(§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ☒    No  ☐
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a
non-accelerated
filer, or an emerging growth company. See definition of “large accelerated filer, ” “accelerated filer,” and “emerging growth company” in Rule
12b-2
of the Exchange Act.
 
Large accelerated filer
 
  
Accelerated filer
 
       
Non-accelerated filer
 
  
Emerging growth company
 
If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant to Section 13(a) of the Exchange Act.  ☐
† The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.
Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.  
Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:
 
U.S. GAAP  ☐
    
International Financial Reporting Standards as issued by the International Accounting Standards Board  ☒
  
Other  ☐
If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow.     Item 17  ☐     Item 18  ☐
If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule
12b-2
of the Securities Exchange Act of 1934).     Yes  ☐     No  
 
 
 

UNITED MICROELECTRONICS CORPORATION
FORM
20-F
ANNUAL REPORT
FISCAL YEAR ENDED DECEMBER 31, 2021
Table of Contents
 
 
    
 
  
Page
 
  
 
1
 
  
 
1
 
    
  
 
4
 
ITEM 1
    
  
 
4
 
ITEM 2
    
  
 
4
 
ITEM 3
    
  
 
4
 
ITEM 4
    
  
 
19
 
ITEM 4A.
    
  
 
37
 
ITEM 5
    
  
 
38
 
ITEM 6
    
  
 
47
 
ITEM 7
    
  
 
51
 
ITEM 8
    
  
 
51
 
ITEM 9
    
  
 
53
 
ITEM 10
    
  
 
54
 
ITEM 11
    
  
 
72
 
ITEM 12
    
  
 
75
 
    
  
 
77
 
ITEM 13
    
  
 
77
 
ITEM 14
    
  
 
77
 
ITEM 15
    
  
 
77
 
ITEM 16A.
    
  
 
80
 
ITEM 16B.
    
  
 
80
 
ITEM 16C.
    
  
 
80
 
ITEM 16D.
    
  
 
81
 
ITEM 16E.
    
  
 
81
 
ITEM 16F.
    
  
 
81
 
ITEM 16G.
    
  
 
81
 
ITEM 16H.
    
  
 
82
 
    
  
 
83
 
ITEM 17
    
  
 
83
 
ITEM 18
    
  
 
83
 
ITEM 19
    
  
 
84
 
 
i

SUPPLEMENTAL INFORMATION
The references to “United Microelectronics”, “we”, “us”, “our”, “our company” and “the Company” in this Annual Report refer to United Microelectronics Corporation and its consolidated subsidiaries, unless the context suggests otherwise. The references to “Taiwan” and “R.O.C.” refer to Taiwan, Republic of China. The references to “China” and “PRC” refer to People’s Republic of China. The references to “shares” and “common shares” refer to our common shares, par value NT$10 per share, and “ADSs” refer to our American Depositary Shares, each representing five common shares. The ADSs are issued under the Deposit Agreement, dated as of October 21, 2009, as amended, supplemented or modified from time to time, among United Microelectronics, JPMorgan Chase Bank, N.A. and the holders and beneficial owners from time to time of American Depositary Receipts issued thereunder. The references to “TIFRSs” refer to the Taiwan International Financial Reporting Standards as issued by the Financial Supervisory Commission in the Republic of China, “IFRSs” refer to International Financial Reporting Standards as issued by the International Accounting Standards Board, or IASB, and “U.S. GAAP” refer to the generally accepted accounting principles in the United States. Any discrepancies in any table between totals and sums of the amounts listed are due to rounding.
We publish our financial statements in New Taiwan dollars, the lawful currency of the R.O.C. In this Annual Report, “NT$” and “NT dollars” mean New Taiwan dollars, “$”, “US$” and “U.S. dollars” mean United States dollars, “¥” means Japanese Yen, “RMB¥” means Renminbi, “SGD” means Singapore Dollar and “€” means EURO.
FORWARD-LOOKING STATEMENTS IN THIS ANNUAL REPORT MAY NOT BE REALIZED
Our disclosure and analysis in this Annual Report contain or incorporate by reference some forward-looking statements. We have based these forward-looking statements on our current expectations and projections about future events. Although we believe that these expectations and projections are reasonable, such forward-looking statements are inherently subject to risks, uncertainties and assumptions about us, including, among other things:
 
   
our dependence on frequent introduction of new product services and technologies based on the latest developments;
 
   
the intensely competitive semiconductor, communications, consumer electronics and computer industries and markets;
 
   
risks associated with our international business activities;
 
   
our dependence on key personnel;
 
   
general economic and political conditions, including those related to the semiconductor, communications, consumer electronics and computer industries;
 
   
natural disasters, such as earthquakes and droughts, which are beyond our control;
 
   
possible disruptions in commercial activities caused by natural and human-induced disasters, and outbreaks of contagious diseases such as the
COVID-19
pandemic;
 
   
fluctuations in foreign currency exchange rates;
 
   
additional disclosures we make in our previous and future Form
20-F
annual reports and Form
6-K
periodic reports to the U.S. Securities and Exchange Commission, or the U.S. SEC; and
 
   
those other risks identified in the “Item 3. Key Information—D. Risk Factors” section of this Annual Report.
You can identify forward looking statements by the fact that they do not relate strictly to historical or current facts. The words “may”, “will”, “is/are likely to”, “anticipate”, “believe”, “estimate”, “expect”, “intend”, “plan” and similar expressions are intended to identify a number of these forward-looking statements. Forward-looking statements in this Form
20-F
include, but are not limited to, statements regarding our business strategies and future plans, anticipated business condition and financial results, our capital expenditure plans, our capacity management plans, expectations as to the capabilities of our technologies and manufacturing process, technological upgrades, investment in research and development, future market demand, regulatory or other developments in our industry, business expansion plans or new investments as well as business acquisitions and financing plans. Please see “Item 3. Key Information—D. Risk Factors” for a further discussion of certain factors that may cause actual results to differ materially from those indicated by our forward-looking statements. We do not and will not undertake the obligation to update or revise any forward-looking statements contained in this Annual Report whether as a result of new information, future events or otherwise. In light of these risks, uncertainties and assumptions, the forward-looking events discussed in this Annual Report might not occur and our actual results could differ materially from those anticipated in these forward-looking statements.
 
1

GLOSSARY
 
AMS    Analog/mixed-signal.
ASIC    Application Specific Integrated Circuit. A custom-designed integrated circuit that performs specific functions which would otherwise require a number of
off-the-shelf
integrated circuits to perform.
BCD    Bipolar-Complementary Metal Oxide Semiconductor (“CMOS”)-Double Diffused Metal Oxide Semiconductor (“DMOS”). An integrated circuit and one of the most important components for power management integration circuits.
BSI-CSI
   Back-Side Illuminated CMOS Image Sensor, which is recently used for mobile product image sensor with better performance and thinner chip.
Cell    Semiconductor structure in an electrical state, which can store a bit of information, mainly used as the building block of memory array.
Die    A piece of a semiconductor wafer containing the circuitry of an unpackaged single chip.
DRAM    Dynamic Random Access Memory. A type of volatile memory product that is used in electronic systems to store data and program instructions. It is the most common type of RAM and must be refreshed with electricity hundreds of times per second or else it will fade away.
eFlash    Embedded Flash Nonvolatile Memory. Used for most SoC
(“System-on-Chip”)
applications and has faster speed and enhanced security.
eHV    Embedded High Voltage Device. Used for Liquid Crystal Display (“LCD”) driver circuit to drive LCD devices.
FinFET    Fin Field-Effect Transistor.
FPGA    Field Programmable Gate Array. A programmable integrated circuit.
Integrated Circuit    Entire electronic circuit built on a single piece of solid substrate and enclosed in a small package. The package is equipped with leads needed to electrically integrate the integrated circuit with a larger electronic system. Monolithic and hybrid integrated circuits are distinguished by the type of substrate used.
Interconnect    The conductive path made from copper or aluminum that is required to achieve connection from one circuit element to the other circuit elements within a circuit.
Mask or Photomask    A piece of glass on which an integrated circuit circuitry design is laid out.
MCU    Microcontroller unit, a small computer on a single integrated circuit, containing one or more central processing units along with memory and programmable input/output peripherals.
Memory    A group of integrated circuits that a computer uses to store data and programs, such as ROM, RAM, DRAM and SRAM.
Micron    A unit of spatial measurement that is
one-millionth
of a meter.
MRAM    Magnetic Random Access Memory.
Nanometer    A unit of spatial measurement that is
one-billionth
of a meter.
PC    Personal computer.
RAM    Random Access Memory. A type of volatile memory forming the main memory of a computer where applications and files are run.
ReRAM    Resistive Random Access Memory.
RF-SOI
   Radio Frequency Silicon on Insulator.
ROM    Read-Only Memory. Memory that is programmed by the manufacturer and cannot be changed. Typically, ROM is used to provide
start-up
data when a computer is first turned on.
Scanner    A photolithography tool used in the production of semiconductor devices. This camera-like
step-and-scan
tool projects the image of a circuit from a master image onto a photosensitized silicon wafer.
 
2

Semiconductor    A material with electrical conducting properties in between those of metals and insulators. Essentially, semiconductors transmit electricity only under certain circumstances, such as when given a positive or negative electric charge. Therefore, a semiconductor’s ability to conduct can be turned on or off by manipulating those charges and this allows the semiconductor to act as an electric switch. The most common semiconductor material is silicon, used as the base of most semiconductor chips today because it is relatively inexpensive and easy to create.
SoC   
System-on-Chip.
A chip that incorporates functions currently performed by several chips on a cost effective basis.
SOI   
Silicon-On-Insulator.
Silicon wafer consisting of a thin layer of oxide, on top of which semiconductor devices are built.
SRAM    Static Random Access Memory. A type of volatile memory product that is used in electronic systems to store data and program instructions. Unlike the more common DRAM, it does not need to be refreshed.
Transistor   
Tri-terminal
semiconductor device in which input signal (voltage or current depending on the type of transistor) controls output current. An individual circuit that can amplify or switch electric current. This is the building block of all integrated circuits.
Volatile memory    Memory products which lose their data content when the power supply is switched off.
Wafer    Thin, round, flat piece of silicon that is the base of most integrated circuits.
8-inch
wafer equivalents
   Standard unit describing the equivalent amount of
8-inch
wafers produced after conversion, used to quantify levels of wafer production for purposes of comparison. Figures of
8-inch
wafer equivalents are derived by converting the number of wafers of all dimensions (e.g.,
6-inch,
8-inch
and
12-inch)
into their equivalent figures for
8-inch
wafers. 100
6-inch
wafers are equivalent to 56.25
8-inch
wafers. 100
12-inch
wafers are equivalent to 225
8-inch
wafers.
 
3

PART I.
 
ITEM 1
IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS
Not applicable.
 
ITEM 2
OFFER STATISTICS AND EXPECTED TIMETABLE
Not applicable.
 
ITEM 3
KEY INFORMATION
 
A.
[RESERVED]
 
B.
Capitalization and Indebtedness
Not applicable.
 
C.
Reasons for the Offer and Use of Proceeds
Not applicable.
 
D.
Risk Factors
Our business and operations are subject to various risks, many of which are beyond our control. If any of the risks described below actually occurs, our business, financial condition or results of operations could be seriously harmed.
Risks Related to Our Business and Financial Condition
Any global systemic political, economic and financial crisis could negatively affect our business, results of operations, and financial condition.
In recent times, several major systemic economic and financial crises negatively affected global business, banking and financial sectors, including the semiconductor industry and markets. These types of crises cause turmoil in global markets that often result in declines in electronic products sales from which we generate our income through our goods and services. In addition, these crises may cause a number of indirect effects such as undermining the ability of our customers to remain competitive when faced with the financial and economic challenges created by adverse political and macro-economic conditions and companies struggling to survive in the wake of these crises. For example, there could be in the future
knock-on
effects from these types of crises on our business, including significant reduction in orders from our customers; insolvency of key suppliers resulting in product delays; inability of customers to obtain credit to finance purchases of our products; customer insolvencies and bankruptcies; and counterparty failures negatively impacting our treasury operations. Any future systemic political, economic or financial crises could cause revenues for the semiconductor industry as a whole to decline dramatically, and if the economic conditions or financial condition of our customers were to deteriorate, additional accounting related allowances may be required in the future and such additional allowances could increase our operating expenses and therefore reduce our operating income and net income. Any disruption in global trade conditions such as the increase in tariffs or the escalation of regional trade tension will indirectly impact global business environment which may adversely impact our business, results of operations and financial condition.
The seasonality and cyclical nature of the semiconductor industry and periodic overcapacity make us particularly vulnerable to significant and sometimes prolonged economic downturns.
The semiconductor industry has historically been highly cyclical and, at various times, has experienced significant downturns. Since most of our customers operate in semiconductor-related industries, variations in order levels from our customers can result in volatility in our revenues and earnings. Because our business is, and will continue to be, largely dependent on the requirements of semiconductor companies for our services, downturns in the semiconductor industry will lead to reduced demand for our services.
Our operating revenues are also typically affected by seasonal variations in market conditions that contribute to the fluctuations of the average selling price of semiconductor services and products. The seasonal sales trends for semiconductor services and products closely mirror those for consumer electronics, communication and computer sales. We generally experience seasonal lows in the demand for semiconductor services and products during the first half of the year, primarily as a result of inventory correction by our customers. Any change in the general seasonal variations, which we cannot anticipate, may result in materially adverse effects on our revenues, operations and businesses.
 
4

Our operating results fluctuate from quarter to quarter, which makes it difficult to predict our future performance.
Our revenues, expenses and results of operations have varied significantly in the past and may fluctuate significantly from quarter to quarter in the future due to a number of factors, many of which are beyond our control. Our business and operations have at times in the past been negatively affected by, and are expected to continue to be subject to the risk of the following factors:
 
   
the seasonality and cyclical nature of both the semiconductor industry and the markets served by our customers;
 
   
our customers’ adjustments in their inventory;
 
   
the loss of a key customer or the postponement of orders from a key customer;
 
   
the rescheduling and cancellation of large orders;
 
   
our ability to obtain equipment, raw materials, electricity, water and other required utilities on a timely and economic basis;
 
   
COVID-19 pandemic and outbreaks of other contagious diseases, including but not limited to severe acute respiratory syndrome, avian flu, swine flu and Zika virus;
 
   
regulatory development and changes affecting our business operations globally;
 
   
global and regional geopolitical conditions, including arms conflicts and wars;
 
   
environmental events, such as fires and earthquakes, or industrial accidents; and
 
   
technological changes.
Due to the factors noted above and other risks discussed in this section, many of which are beyond our control, you should not rely on
quarter-to-quarter
comparisons to predict our future performance. Unfavorable changes in any of the above factors may seriously harm our business, financial condition and results of operations. In addition, our operating results may be below the expectations of public market analysts and investors in some future periods. In this event, the price of the common shares or ADSs may underperform or fall.
A decrease in demand for or selling prices of communication devices, consumer electronics and computer goods may decrease the demand for our services and reduce our margins.
Our customers generally use the semiconductors produced in our fabs in a wide variety of applications. We derive a significant percentage of our operating revenues from customers who use our manufacturing services to make semiconductors for communication devices, consumer electronics, PCs and other computers. The semiconductor industry experienced several downturns due to recent major financial crises and natural disasters. These downturns resulted in a reduced demand for our services and hence decreased our revenues and earnings. Any significant decrease in the demand for communication devices, consumer electronics, PCs or other computers may further decrease the demand for our services. In addition, if the average selling price of communication devices, consumer electronics, PCs or other computers decline significantly, we will be pressured to further reduce our selling prices, which may reduce our revenues and, therefore, reduce our margins significantly. As demonstrated by downturns in demand for high technology products in the past, market conditions can change rapidly, without apparent warning or advance notice. In such instances, our customers will experience inventory buildup and/or difficulties in selling their products and, in turn, will reduce or cancel orders for wafers from us. The timing, severity and recovery of these downturns cannot be predicted accurately or at all. When they occur, our business, profitability and price of the common shares and ADSs are likely to suffer. In addition, we may not be able to verify or guarantee the creditworthiness of some of our customers. If customers fail to make payments on a timely basis and accumulate substantial accounts receivable, we may not be able to collect payments or may incur substantial costs and expenses to pursue legal remedies to recover such losses, which may have an adverse effect on our financial conditions and results of operations.
 
5

Overcapacity in the semiconductor industry may reduce our revenues, earnings and margins.
The prices that we can charge our customers for our services are significantly related to the overall worldwide supply of integrated circuits and semiconductor products. The overall supply of semiconductor products is based in part on the capacity of other companies, which is outside of our control. For example, in light of the current market conditions, some companies, including our largest competitors, have announced plans to increase capacity expenditures significantly. We believe such plans, if carried out as planned, will increase the industry-wide capacity and are likely to result in overcapacity in the future. In periods of overcapacity, if we are unable to offset the adverse effects of overcapacity through, among other things, our technology and product mix, we may have to lower the prices we charge our customers for our services and/or we may have to operate at significantly less than full capacity. Such actions could reduce our margin and profitability and weaken our financial condition and results of operations. We cannot give any assurance that an increase in the demand for foundry services in the future will not lead to overcapacity in the near future, which could materially adversely affect our revenues, earnings and margins.
Any problem in the semiconductor outsourcing infrastructure can adversely affect our operating revenues and profitability.
Many of our customers depend on third parties to provide mask tooling, assembly and test services, and we and our customers may not be able to control or direct such third parties to provide these services timely or at costs reasonable to our customers. If these customers cannot timely obtain these services on reasonable terms, they may not order any foundry services from us. This may significantly reduce our operating revenues and negatively affect our profitability.
We may be unable to implement new technologies as they become available, which may result in the decrease of our profitability and the loss of customers and market share.
The semiconductor industry is characterized by rapidly evolving and constantly changing technology. If we do not anticipate the technology evolution and rapidly adopt new and innovative technology, we may not be able to produce sufficiently advanced services at competitive prices. Our competitors may adopt new technology before we do and reduce our ability to compete effectively in the market. If we are unable to begin offering advanced services and processes on a competitive and timely basis, we may lose customers to our competitors providing similar technologies, which may cause our operating revenues to decline unless we can replace lost customers with new customers. In addition, the market prices for advanced technology and services tend to fall over time. As a result, if we are unable to offer new advanced services and processes on a competitive and timely basis, we may need to reduce prices that we set for our existing services and processes, which would have a negative effect on our profitability. We also depend upon the introduction of new technologies on a timely basis in order to benefit from the relatively higher prices such new technologies offer in the earlier stages of their life cycles. If we are unable to introduce new technologies on a timely and competitive basis, we may not be able to benefit from the relatively higher prices for new technologies, and our average selling price and profits would decrease accordingly.
We may be unable to provide leading technology to our customers if we lose the support of our technology partners.
Enhancing our manufacturing process technologies is critical to our ability to provide services for our customers. We intend to continue to advance our process technologies through internal research and development and alliances with other companies. In addition to our internal research and development team focused on developing new and improved semiconductor manufacturing process technologies, we are also dependent on some of our technology partners to advance certain process technology portfolios. In addition, we currently have patent cross-licensing agreements with several companies, including International Business Machines Corporation, or IBM. Some mask and equipment vendors also supply our technology development teams with masks and equipment needed to develop more advanced processing technologies. If we are unable to continue any of our joint development arrangements, patent cross-licensing agreements and other agreements, on mutually beneficial economic terms, if we
re-evaluate
the technological and economic benefits of such relationships, if we are unable to enter into new technology alliances and arrangements with other leading and specialty semiconductor companies, or if we fail to secure masks and equipment from our vendors in a timely manner sufficient to support our ongoing technology development, we may be unable to continue providing our customers with leading edge mass-producible process technologies and may, as a result, lose important customers, which would have a materially adverse effect on our businesses, results of operations and financial condition.
In addition, some of our customers rely upon third-party vendors, or intellectual property (IP) vendors, for the IP they embed into their designs. Although we work and collaborate with IP vendors with respect to such matters, there can be no guarantee that we will be successful or that the vendors will deliver according to our requirements or the needs of our customers. Failures to meet the targets or to deliver on a timely basis could cause customers to cancel orders and/or shift capacity to other suppliers.
 
6

The COVID-19 pandemic may materially and adversely affect our business and operations, as well as our financial condition and results of operations.
Our business and results of operations may be adversely affected by the global COVID-19 pandemic and related events and we expect its impact to continue. The ongoing COVID-19 pandemic may materially adversely affect our business and results of operations in several ways, including but not limited to: (i) interruption and disruptions of our supply chains for equipment, parts and materials in terms of manufacturing, logistics, and manpower arrangements for tool installation; (ii) significant fluctuation in customer demands for certain products, leading to uncertainties for our capacity planning and our ability to meet such demands; (iii) strict border control measures and travel restrictions, which may delay or limit our employees or vendors from completing necessary training programs or providing services; and (iv) potential production delays for our products due to forced factory or office closures or partial operation.
We have implemented various measures to address the abovementioned risks, including but not limited to, health management of our employees, management of production inventory and supply chain risk management. However, there is no certainty that the measures we have taken will be sufficient to mitigate the risks posed by COVID-19 pandemic, and our ability to perform critical functions and to meet customers’ needs could be materially adversely affected. In addition, there is also a risk that any post-pandemic downward changes in consumers’ demand for electronic products may in turn, lead to reduced demand for our products and services.
In addition, if any of our employees is suspected of having contracted COVID-19 or any contagious disease, we may under certain circumstances be required to quarantine such employees and the affected areas of our premises. Therefore, we may have to temporarily suspend part of or all of our operations. Furthermore, government actions to contain the outbreak may restrict the level of economic activities in affected regions, including Taiwan and China, and affect the willingness and ability of our employees and customers to travel, which may also adversely affect our business and prospects. Moreover, any lockdown or limitation on economic activities imposed by the governments may prevent us from operating our fabs effectively and cause disruption to our customers. As a result, we cannot assure you that any future outbreak of contagious diseases would not have a material adverse effect on our financial condition and results of operations.
The full extent of the future impact of the COVID-19 pandemic on our operational and financial performance is uncertain and will depend on many factors beyond our control, including, without limitation, the timing, extent, trajectory and duration of the pandemic; the availability, distribution and effectiveness of vaccines; the spread of new variants of COVID-19; the continued and renewed imposition of protective public safety measures; the continuing global disruption in supply chains in our industries and the impact of the pandemic on the global economy, inflation and demand for consumer products. Even after the pandemic has subsided and economic activities gradually increase, we may continue to experience material and adverse impacts to our business, operating results, and financial condition as a result of the pandemic’s lasting global economic impact, including any recession that has occurred or may occur in the future in our industries or continuing inflationary impacts.
Our business may suffer if we cannot compete successfully in our industry.
The worldwide semiconductor foundry industry is highly competitive. We compete with dedicated foundry service providers such as Taiwan Semiconductor Manufacturing Company Limited, Semiconductor Manufacturing International (Shanghai) Corporation, Globalfoundries Inc., as well as the foundry operation services of some integrated device manufacturers, such as Intel, Samsung Electronics, or Samsung, SK Hynix and Toshiba Corporation, or Toshiba. Integrated device manufacturers principally manufacture and sell their own proprietary semiconductor products, but may also offer foundry services. Other competitors such as Dongbu Anam Semiconductor, Hua Hong, Powerchip, TowerJazz, Vanguard and XMC have initiated efforts to expand and develop substantial additional foundry capacity. New entrants and consolidations in the foundry business are likely to initiate a trend of competitive pricing and create potential overcapacity in legacy technology. Some of our competitors have greater access to capital and substantially greater production, research and development, marketing and other resources than we do. As a result, these companies may be able to compete more aggressively over a longer period of time than we can.
The principal elements of competition in the wafer foundry market include:
 
   
technical competence;
 
   
time-to-volume
production and cycle time;
 
   
time-to-market;
 
   
research and development quality;
 
   
available capacity;
 
   
manufacturing yields;
 
   
customer service and design support;
 
   
price;
 
   
management expertise; and
 
   
strategic alliances.
 
7

Our ability to compete successfully also depends on factors partially outside of our control, including product availability, IP, including cell libraries that our customers embed in their product designs, and industry and general economic trends.
We may not be able to implement our planned growth if we are unable to obtain the financing necessary to fund the substantial capital expenditures we expect to incur.
Our business and the nature of our industry require us to make substantial capital expenditures leading to a high level of fixed costs. The costs of facilities, tools and equipment to make semiconductors with advanced technology continue to rise, with each generation typically significantly more expensive than the
larger-in-size
more mature technologies which preceded. We expect to incur significant capital expenditures in connection with our growth plans. These capital expenditures will be made in advance of any additional sales to be generated by new or upgraded fabs as a result of these expenditures. Given the fixed-cost nature of our business, we have in the past incurred, and may in the future incur, operating losses if our revenues do not adequately offset our capital expenditures. Additionally, our actual expenditures may exceed our planned expenditures for a variety of reasons, including changes in:
 
   
our growth plan;
 
   
our process technology;
 
   
our research and development efforts and patent license arrangements;
 
   
market conditions;
 
   
interest rates;
 
   
exchange rate fluctuations; and
 
   
prices of equipment.
We cannot assure you that additional financing will be available on satisfactory terms, if at all. If adequate funds are not available on satisfactory terms, we may be forced to curtail our expansion plans or delay the deployment of our services, which could result in a loss of customers and limit the growth of our business.
We depend on a small number of customers for a significant portion of our operating revenues and any loss of these customers would result in significant declines in our operating revenues.
We have been largely dependent on a small number of customers for a substantial portion of our business. In 2021, our top ten customers accounted for 54.5% of our operating revenues and a customer from our wafer fabrication segment accounted for at least 10% of operating revenues for the years ended December 31, 2019, 2020 and 2021. We expect that we will continue to depend upon a relatively limited number of customers for a significant portion of our operating revenues. We cannot assure you that our operating revenues generated from these customers, individually or in the aggregate, will reach or exceed historical levels in any future period. Loss or cancellation of business from significant changes in scheduled deliveries to, or decreases in the prices of services sold to any of these customers could significantly reduce our operating revenues.
Our customers generally do not place purchase orders far in advance, which makes it difficult for us to predict our future revenues, adjust production costs and allocate capacity efficiently on a timely basis. In addition, due to the cyclical nature of the semiconductor industry, our customers’ purchase orders have varied significantly from period to period. As a result, we do not typically operate with any significant backlog, except in periods of extreme capacity shortage. The lack of significant backlog and the unpredictable length and timing of semiconductor cycles make it difficult for us to forecast our revenues in future periods. Moreover, our expense levels are based in part on our expectations of future revenues, and we may be unable to adjust costs in a timely manner to compensate for revenue shortfalls. We expect that in the future our operating revenues in any quarter will continue to be substantially dependent upon purchase orders received in that quarter.
Moreover, the increasing trend in mergers and acquisitions activities in the semiconductor industry could reduce total available customer base, which could potentially result in a loss of customers.
Our operations and business will suffer if we lose one or more of our key personnel without adequate replacements.
Our future success to a large extent depends on the continued services of our Chairman and key executive officers. We do not carry key person insurance on any of our personnel. If we lose the services of any of our Chairman or key executive officers, it could be difficult to find and integrate replacement personnel in a short period of time, which could harm our operations and the growth of our business.
 
8

We may have difficulty attracting and retaining skilled employees, who are critical to our future success.
The success of our business depends upon attracting and retaining experienced executives, engineers and other employees to implement our strategy. The competition for skilled employees is intense in our industry, which is exacerbated by the shortage of qualified personnel with appropriate experiences and expertise. We expect demand for personnel in Taiwan to increase in the future as new wafer fabrication facilities and other businesses are established in Taiwan. We also expect demand for experienced personnel in other locations to increase significantly as our competitors establish and expand their operations. Some of our competitors are willing to offer better compensation than what we do to our executives, engineers and other employees. We do not have long-term employment contracts with any of our employees. If we were unable to retain our existing personnel or attract, assimilate and recruit new experienced personnel in the future, it could seriously disrupt our operations and delay or restrict the growth of our business.
Our transactions with affiliates and shareholders may hurt our profitability and competitive position.
We have provided foundry services to several of our affiliates and shareholders. We currently do not provide any preferential treatment to any of these affiliates and shareholders. However, we may in the future reserve or allocate our production capacity to these companies if there is a shortage of foundry services in the market to enable these companies to maintain their operations and/or to protect our investments in them. This reservation or allocation may reduce our capacity available for our other customers, which may damage our relationships with other customers and discourage them from using our services. This may hurt our profitability and competitive position.
If we fail to maintain an effective system of internal control over financial reporting, we may be unable to accurately report our financial results or prevent fraud, and investor confidence in our company may be adversely affected.
We are required to comply with the R.O.C. and the U.S. securities laws and regulations in connection with internal controls. As a public company in the United States, our management is required to assess the effectiveness of our internal control over financial reporting using the criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), or the COSO criteria, as required by Section 404 of the Sarbanes-Oxley Act of 2002. Moreover, even if our management concludes that our internal control over financial reporting is effective, our independent registered public accounting firm may decline to issue an opinion as to the effectiveness of our internal control over financial reporting, or may issue a report that is qualified or adverse. During the course of the evaluation of internal control over financial reporting, we or our independent registered public accounting firm may identify control deficiencies that we may not be able to remediate prior to the date of our first assessment of internal control over financial reporting. Our failure to achieve and maintain effective internal control over financial reporting could result in the loss of investor confidence in the reliability of our financial statements or prevent fraud, which in turn could harm our business and negatively impact the trading price of our securities.
Although effective internal controls can provide reasonable assurance with respect to the preparation and fair presentation of financial statements, they may not prevent or detect misstatements because of their inherent limitations, including the possibility of human error, the circumvention or overriding of controls, fraud or corruption. If we fail to maintain the adequacy of our internal controls, our business and operating results could be harmed, we could fail to meet our reporting obligations, and there could be a material adverse effect on the market price of our common shares and ADSs.
The trend of adopting protectionist measures in certain countries, including the United States, could have a material adverse impact on our results of operations and financial condition.
Governments in the United States, PRC and certain other countries have implemented fiscal and monetary programs to stimulate economic growth as a result of the recent economic downturn, and many of these programs include protectionist measures that encourage the use of domestic products and labor. Recent policy developments by the governments in US, China and elsewhere also suggest an increased unwillingness to allow international companies to invest in or acquire local businesses. Since many of our direct customers and other downstream customers in the supply chain are located in or have operations in the countries where protectionist measures were adopted, such protectionist measures may have a material adverse effect on demand for our manufacturing services.
 
9

We may decide to make strategic acquisitions of other companies, assets or businesses and such acquisitions may introduce significant risks and uncertainties, including risks related to integrating the acquired assets or businesses.
In order to position ourselves to take advantage of growth opportunities, we have made, and may continue to make, certain strategic acquisitions, mergers and alliances that involve significant risks and uncertainties. Even if we have identified a suitable target or partner for a strategic transaction, there is no guarantee that we will be able to negotiate a successful agreement at pricing favorable to us or to consummate the transaction in a timely manner, or at all. Furthermore, we may incur significant costs in pursuing such strategic transaction and invest in a substantial amount of time and effort without a guarantee that such transaction will be completed. Successful acquisitions and alliances in the semiconductor industry are difficult to accomplish because they require efficient integration and aligning of product offerings and manufacturing operations and coordination of sales and marketing and research and development efforts. The difficulties of integration and alignment may be increased by the necessity of coordinating geographically separated organizations, the complexity of the technologies being integrated and aligned and the necessity of integrating personnel with disparate business backgrounds and combining different corporate cultures. Furthermore, there is no guarantee that we will be able to identify a viable target for strategic acquisition, and we may incur significant costs and resources in such effort that may not result in a successful acquisition. In addition, we may also issue equity securities to pay for future acquisitions or alliances, which could be dilutive to existing shareholders. We may also incur debt or assume contingent liabilities in connection with acquisitions and alliances, which could impose restrictions on our business operations and harm our operating results.
We may not be able to fully realize the expected benefits from the acquisition of USJC and the operation of USJC may subject us to additional risks.
In October 2019, we closed a transaction to acquire Fujitsu’s interest in Mie Fujitsu Semiconductor Limited, or MIFS. Upon the closure of such transaction, MIFS was later renamed United Semiconductor Japan Corporation LTD., or USJC, and became one of our wholly-owned subsidiaries. There is a large number of processes, policies, procedures, operations, technologies and systems at USJC and UMC that must be integrated, including accounting and finance, payroll, revenue management, commercial operations, risk management and employee benefits. We expect to incur significant expenses and costs to complete the integration process which may adversely affect our financial performance. The integration of newly acquired businesses will also require a significant amount of time and attention from management. Moreover, even if we were able to fully integrate the business operations of USJC successfully, there can be no assurance that this integration will result in the realization of the full benefits of synergies, cost savings, innovation and operational efficiencies that may be possible from this integration or that these benefits will be achieved within a reasonable period of time. Delays in integrating USJC, which could be caused by factors outside of our control, could adversely affect the intended benefits of our business, financial results, financial condition and stock price. In addition, the acquisition may subject us to additional operational and financial risks, including the following:
 
   
uncertainties in the business relationships with our collaborators and suppliers;
 
   
loss of customers and uncertainties with continuation of customer relationships previously held by MIFS;
 
   
additional capital expenditures required to upgrade and operate the new fab;
 
   
additional costs relating to compliance with rules and regulations in Japan;
 
   
failure to achieve appropriate manufacturing yields or products to meet our or our customers’ specifications;
 
   
problems in ramping production and installing new equipment; and
 
   
loss of employees or labor issue.
Any of these risks may prevent us from realizing the benefits of the acquisition or reduce our ability to achieve profitability at the fab, which may have an adverse effect on our financial condition and results of operations.
Currency fluctuations could increase our costs relative to our revenues, which could adversely affect our profitability.
More than half of our operating revenues are denominated in currencies other than New Taiwan dollars, primarily in U.S. dollars. On the other hand, more than half of our costs of direct labor, raw materials and overhead are incurred in New Taiwan dollars. Although historically we hedged a portion of the resulting net foreign exchange position through the use of foreign exchange spot transactions, or currency forward contracts, we are still affected by fluctuations in foreign exchange rates among the U.S. dollar, the New Taiwan dollar and other currencies. Any significant fluctuation in exchange rates may impact on our financial condition and the U.S. dollar value of the ADSs and the U.S. dollar value of any cash dividends we distributed, which could have an adverse effect on the market price of the ADSs.
 
10

Risks Relating to Manufacturing
Our manufacturing processes are highly complex, costly and potentially vulnerable to impurities and other disruptions that can significantly increase our costs and delay product shipments to our customers.
Our manufacturing processes are highly complex, require advanced and costly equipment and are continuously being modified to improve manufacturing yields and product performance. Impurities or other difficulties in the manufacturing process or defects with respect to equipment or supporting facilities can lower manufacturing yields, interrupt production or result in losses of products in process. As system complexity has increased and process technology has become more advanced, manufacturing tolerances have been reduced and requirements for precision have become even more demanding. Although we have been enhancing our manufacturing capabilities and efficiency, from time to time we have experienced production difficulties that have caused delivery delays and quality control problems, as is common in the semiconductor industry. In the past we have encountered the following problems:
 
   
capacity constraints due to changes in product mix or the delayed delivery of equipment critical to our production, including scanners, steppers and chemical stations;
 
   
construction delays during expansions of our clean rooms and other facilities;
 
   
difficulties in upgrading or expanding existing facilities;
 
   
manufacturing execution system or automatic transportation system failure;
 
   
unexpected breakdowns in our manufacturing equipment and/or related facilities;
 
   
changing or upgrading our process technologies;
 
   
raw materials shortages and impurities; and
 
   
delays in delivery and shortages of spare parts and in maintenance for our equipment and tools.
Should these problems persist or repeat, we may suffer delays in delivery and/or loss of business and revenues. In addition, we cannot guarantee that we will be able to increase our manufacturing capacity and efficiency in the future to the same extent as in the past.
Our profit margin may substantially decline if we are unable to continuously improve our manufacturing yields, maintain high capacity utilization and optimize the technology mix of our silicon wafer production.
Our ability to maintain our profitability depends, in part, on our ability to:
 
   
maintain high capacity utilization, which is defined as the ratio of the
wafer-out
quantity of
8-inch
wafer equivalents divided by our estimated total
8-inch
equivalent capacity in a specified period. The estimated capacity figures may vary depending upon equipment delivery schedules, pace of migration to more advanced processing technologies and other factors affecting production
ramp-ups;
 
   
maintain or improve our manufacturing yields, which is defined as the percentage of usable devices manufactured on a wafer; and
 
   
optimize the technology mix of our production by increasing the number of wafers manufactured by utilizing different processing technologies.
Our manufacturing yields directly affect our ability to attract and retain customers, as well as the price of our services. Our capacity utilization affects our operating results because a large percentage of our operating costs are fixed. Our technology mix affects utilization of our equipment and process technologies, as well as the prices we can charge, either of which can affect our margins. If we are unable to continuously improve our manufacturing yields, maintain high capacity utilization or optimize the technology mix of our wafer production, our profit margin may substantially decline.
 
11

We may have difficulty in ramping up production in accordance with our schedule, which could cause delays in product deliveries and decreases in manufacturing yields.
As is common in the semiconductor industry, we have from time to time experienced difficulties in ramping up production at new or existing facilities or effecting transitions to new manufacturing processes. As a result, we have suffered delays in product deliveries or reduced manufacturing yields. We may encounter similar difficulties in connection with:
 
   
the migration to more advanced process technologies, such as 45/40 and
28-nanometer
and more advanced process technology;
 
   
the joint development with vendors for more powerful tools (both in production and inspection) needed in the future to meet advanced process technology requirements; and
 
   
the adoption of new materials in our manufacturing processes.
We may face construction delays, interruptions, infrastructure failure and delays in upgrading or expanding existing facilities, or changing our process technologies, any of which might adversely affect our production schedule. Our failure to achieve our production schedule could delay the time required to recover our investments and seriously affect our profitability.
Our production schedules could be delayed and we may lose customers if we are unable to obtain raw materials and equipment in a timely manner.
We depend on our suppliers for raw materials. To maintain competitive manufacturing operations, we must obtain from our suppliers, in a timely manner, sufficient quantities of quality materials at acceptable prices. Although we source our raw materials from several suppliers, a small number of these suppliers account for a substantial amount of our supply of raw materials because of the consistent quality of their products. For example, in 2019, 2020 and 2021, we purchased a majority of our silicon wafers from five makers, Shin-Etsu Handotai Corporation, or Shin-Etsu, GlobalWafers, Siltronic and Sumco Group (including Sumco Corporation and Formosa Sumco Technology Corporation) and Soitec. From time to time, our suppliers have extended lead time or limited the supply of required materials to us because of capacity constraints. Consequently, from time to time, we have experienced difficulty in obtaining the quantities of raw materials we need on a timely basis.
In addition, from time to time we may reject materials that do not meet our specifications and quality standards, resulting in declines in output or manufacturing yields. We cannot assure you that we will be able to obtain sufficient quantities of raw materials and other supplies in a timely manner. Furthermore, the recent global supply chain disruption may adversely affect our ability to acquire and purchase raw materials in sufficient quantities or at all, or in a timely manner. Furthermore, the recent global supply chain disruption may adversely affect our ability to acquire and purchase raw materials in sufficient quantities or at all, or in a timely manner. If the supply of materials is substantially diminished or if there are significant increases in the costs of raw materials, we may be forced to incur additional costs to acquire sufficient quantities of raw materials to sustain our operations, which may increase our marginal costs and reduce profitability.
We also depend on a limited number of manufacturers and vendors that make and maintain the complex equipment we use in our manufacturing processes. We also rely on these manufacturers and vendors to improve our technology to meet our customers’ demands as technology improves. In periods of unpredictable and highly diversified market demand, the lead time from order to delivery of this equipment can be as long as fourteen to
forty-two
months. If there are delays in the delivery of equipment or in the availability or performance of necessary maintenance, or if there are increases in the cost of equipment, it could cause us to delay our introduction of new manufacturing capacity or technologies and delay product deliveries, which may result in the loss of customers and revenues.
We may be subject to the risk of loss due to fire because the materials we use in our manufacturing processes are highly flammable.
We use highly flammable materials such as silane and hydrogen in our manufacturing processes and may therefore be subject to the risk of loss arising from fires. The risk of fire associated with these materials cannot be completely eliminated. We maintain insurance policies to reduce losses caused by fire, including business interruption insurance. However, our insurance coverage is subject to deductibles and self-insured retention and may not be sufficient to cover all of our potential losses. If any of our fabs were to be damaged or cease operations as a result of a fire, it would temporarily reduce manufacturing capacity and reduce revenues.
 
12

We and many of our customers and suppliers are vulnerable to natural disasters and other events outside of our control, which may seriously disrupt our operations.
Most of our assets and many of our customers and suppliers are located in certain parts of Taiwan. Our operations and the operations of our customers and suppliers are vulnerable to earthquakes, floods, droughts, power losses and similar events that affect the locations of our operations. The occurrence of any of these events could interrupt our services and cause severe damages to wafers in process, or cause significant business disruptions. For example, given the prolonged period in the lack of rainfall particularly acute in southern Taiwan which may impact our manufacturing capacity and may cause us to lose important customers, therefore may have a potentially adverse and material impact on our operational and financial performance. Besides the potential risks that may be caused by water shortage, we have in the past experienced severe earthquakes which adversely affected our wafer manufacturing operations in Taiwan. Although we had adopted practices in compliance with ISO 22301 business continuity standards which ensured the safety of our employees and minimized supply disruptions resulting from the earthquake and we recovered partially the losses resulting for this earthquake from our insurance policy, there is no guarantee that our business continuity practices will always be effective. There is also no guarantee that any future damages or business loss from severe natural disasters will be covered by such insurance, that we will be able to collect from our insurance carriers, should we choose to claim under our insurance policies, or that such coverage will be sufficient. Furthermore, the cost of insurance policies may increase in the future that will make it more expensive for us to obtain and maintain adequate insurance policies. In addition, our manufacturing facilities have occasionally experienced insufficient power supplies, and our operations have been disrupted.
Our operations may be delayed or interrupted and our business could suffer if we violate environmental, safety and health, or ESH, regulations.
The semiconductor manufacturing process requires the use of various gases, chemicals, hazardous materials and other substances such as solvents and sulfuric acid which may have an impact on the environment. We are always subject to ESH regulations, and a failure to manage the use, storage, transportation, emission, discharge, recycling or disposal of raw materials or to comply with these ESH regulations could result in (i) regulatory penalties, fines and other legal liabilities, (ii) suspension of production or delays in operation and capacity expansion, (iii) a decrease in our sales, (iv) an increase in pollution cleaning fees and other operation costs, or (v) damage to our public image, any of which could harm our business. In addition, as ESH regulations are becoming more comprehensive and stringent, we may incur a greater amount of capital expenditures in technology innovation and materials substitution in order to comply with such regulations, which may adversely affect our results of operations.
Climate change may negatively affect our business.
There is increasing concern that climate change is occurring and may have dramatic effects on human activity without aggressive remediation steps. The change in temperature would result in increased severity and frequency of extreme weather events such as cyclones, floods, water stress, high temperature and increasing risk of extinction for the world’s species. Public expectations for reductions in greenhouse gas emissions and climate-related risks could result in increased energy, water, transportation and raw material costs, which raised shareholder’s concern and caused several international standards and questionnaires being revised to request enterprises disclosing their risks and financial impacts. Consequently, our climate change risk assessment tool was developed and related departments participated in the identification work.
As climate change continues to be severe, the international community not only pays attention to the energy transition, but also successively establishes mechanisms for monetizing the impact of carbon emissions on society and the environment, such as carbon pricing mechanism, carbon border adjustment mechanism, etc. For example, we have an advanced
12-inch
wafer fab in Singapore. The Singapore government introduced a carbon tax from 2019 onwards, making it the first country in Southeast Asia to promote this measure. In Taiwan, the Environmental Protection Administration proposed a draft revision to the GHG Management Act with an amendment of its name to “Climate Change Response Act” in 2021. There are additional stringent regulations including a
carbon-fee
charging to promote GHG reduction and
low-carbon
economy development.
In addition, government’s energy policy may cause power shortage and affect our business operation. For example, “Dual control” to reduce energy intensity and to limit total energy consumption is a key measure that the Chinese government implements to help meet its energy and climate goals. In 2021, some provinces started to employ power rationing for high-energy-consuming industries. Although UMC has not been affected yet, we will continue to pay attention to this risk.
We have developed climate change risk assessment tool and related departments participated in the identification work. Adaptation and mitigation measures are developed in response to the identified climate change risk. Furthermore, we also disclosed risk and opportunity of climate change according to the framework of TCFD (Task Forced on Climate-related Financial Disclosures) in UMC Sustainability Report and our official website. In May 2021, UMC meets the TCFD performance assessment at management level of “Pioneer” which verified by SGS Taiwan Ltd., endorsing that our climate change risk assessment system and associated financial disclosure data are highly credible and transparent.
Disruptions in the international trading environment may seriously decrease our international sales.
A substantial portion of our operating revenues is derived from sales to customers located in countries other than the countries where our fabs are located. We operated fabs in Taiwan, Singapore, China and Japan. For the years ended December 31, 2019, 2020 and 2021, we generated approximately 27.9%, 27.0% and 27.4% of our operating revenues, respectively, from countries other than those where our fabs are located. We expect sales to customers from countries outside of Taiwan, Singapore, China and Japan will continue to represent a significant portion of our operating revenues. The success and profitability of our international activities depend on certain factors beyond our control, such as general economic conditions, labor conditions, political stability, tariff, tax laws, import duties, export control and foreign exchange controls of the countries in which we sell our products, and the political and economic relationships between these countries. As a result, our manufacturing services will continue to be vulnerable to disruptions in the international trading environment, including adverse changes in foreign government regulations, political unrest and international economic downturns.
 
13

These disruptions in the international trading environment affect the demand for our manufacturing services and change the terms upon which we provide our manufacturing services overseas, which could seriously decrease our international sales.
Political, Economic, Regulatory and Legal Risks
We face substantial political risks associated with doing business in Taiwan, particularly due to the tense relationship between the R.O.C. and the People’s Republic of China, or the PRC, that could negatively affect the value of your investment.
Our principal executive offices and most of our assets and operations are located in Taiwan. Accordingly, our business, financial condition and results of operations and the market price of our common shares and the ADSs may be affected by changes in R.O.C. governmental policies, taxation, inflation or interest rates and by social instability and diplomatic and social developments in or affecting Taiwan which are outside of our control. Taiwan has a unique international political status. Since 1949, Taiwan and the Chinese mainland have been separately governed. The PRC claims that it is the sole government in China and that Taiwan is part of China. Although significant economic and cultural relations have been established between the R.O.C. and the PRC in the past few years, such as the adoption of the Economic Cooperation Framework Agreement and memorandum regarding cross-strait financial supervision, we cannot assure you that relations between the R.O.C. and PRC will not become strained again, in particular, considering the increasingly tense relationship between the United States and the PRC. For example, the PRC government has refused to renounce the use of military force to gain control over Taiwan and, in March 2005, passed an Anti-Secession Law that authorized
non-peaceful
means and other necessary measures should Taiwan move to gain independence from the PRC. Past developments in relations between the R.O.C. and the PRC have on occasions depressed the market prices of the securities of companies in the R.O.C. Such initiatives and actions are commonly viewed as having a detrimental effect to reunification efforts between the R.O.C. and the PRC. Relations between the R.O.C. and the PRC and other factors affecting military, political or economic conditions in Taiwan could materially and adversely affect our financial condition and results of operations, as well as the market price and the liquidity of our securities.
Our business depends on the support of the R.O.C. government and other government authorities in countries and regions where we operate, and a decrease in these supports may reduce our net income.
We, like many R.O.C. technology companies, have benefited from substantial tax incentives provided by the R.O.C. government and other government authorities in countries and regions where we operate under various different tax incentive programs, which are subject to the review and approval by the relevant tax authorities on the case by case basis. Although we will make our best efforts to meet the requirements under different incentive schemes and make the relevant applications, we cannot assure you that the tax authorities will grant the approval as we apply. Our application may be denied for reasons outside of our control, including changes in tax incentive regulations and criteria for qualifications. Additionally, the tax incentives granted, taken as a whole, may not be as favorable to us as those currently in effect. If any of the above occurs, our net income may decrease.
Our future tax obligations may adversely affect our net income.
We operate in various jurisdictions, which involve different tax regimes and application of tax regulations. Applicable taxes for which we make provisions could increase significantly as a result of changes in applicable tax laws in the countries where we operate.
Some of the above-mentioned tax incentives maybe subject to the investment milestone and comply with the terms and conditions set forth in the agreements with the government. Failure to fulfill the investment milestone or the terms and conditions would result in termination or revocation of the incentives. The local authority may have the rights to revoke these incentive rewards even if the company received tax benefits that it had enjoyed during the applicable period by the applicable tax laws or regulations.
The Organization for Economic Cooperation and Development (OECD) and G20 countries worked together to create the OECD/G20 Inclusive Framework on Base Erosion and Profit Shifting (BEPS), which contemplates changes to numerous international tax principles. Over 135 members agreed to a
two-pillar
solution to address the tax challenges arising from the digitalization of the economy and Global Anti-Base Erosion Model Rules. Pillar 1 aims to ensure a better distribution of taxation of multinationals according to the countries in which they operate, and Pillar 2 aims to control tax competition on corporate profits by introducing a global minimum tax of 15%. The taxation of
two-pillar
solution is expected to implement as soon as Jan, 1 2023. In response to the domestic minimum corporate tax rate aimed by Pillar 2, Taiwan’s finance ministry planned to increase the Alternative
Minimum Tax from 12% to 15% effective from 2023. In addition, Taiwan finance ministry will endeavor to implement Pillar 1 and 2 as proposed by OECD and Inclusive Framework.
The R.O.C. income Tax Act was amended in 2016 to introduce controlled foreign company (CFC) provisions, and the implementation rules were announced in September 2017. The legislation has announced to effective on Jan, 1 2023.
The implementation of
two-pillar
solution and CFC rule may increase our income tax rate in future and cause adverse effect to our net income.
 
14

Compliance with U.S. Conflict Minerals Law may affect our ability or the ability of our suppliers to purchase raw materials at an effective cost.
We are subject to U.S. disclosure rules on conflict minerals adopted by the SEC, pursuant to which we are required to conduct due diligence of our supply chain and file an annual report to disclose whether conflict minerals utilized by us originated in the Democratic Republic of the Congo (DRC) or an adjoining country. We have filed the conflict mineral disclosure report every year since 2014 in order to comply with such rules, we will continue to verify the relevant information with our vendors and suppliers and file the required report but we cannot assure you that we will be able to collect all the information required to comply with such regulations. If we are not able to confirm such information with vendors, or if we discover that some vendors are sourcing conflict minerals from prohibited countries, we may decide or be required to discontinue our relationship with such vendors, which may negatively impact our ability to obtain adequate supplies of materials needed for the manufacturing of our products and services. The failure to obtain necessary information or to maintain adequate supplies of materials from supply chains outside the DRC and adjoining countries may delay our production, increasing the risk of losing customers and business.
Similarly, many jurisdictions have promulgated regulations with the intention to deter human rights violations within supply chains. Possible violation by our suppliers may not be known to us and is beyond our control. While we believe our suppliers comply with applicable human rights requirements, there can be no guarantee that they will continue to do so, or that we will be able to obtain the necessary information on their activities to comply with whatever future requirements may be enacted.
Cyberattacks and data security breaches may adversely affect our operations and damage our reputation.
Our business and operations depend upon reliable and uninterrupted information technology services, including the integrity of our
web-based
and electronic customer service systems. Although we have implemented what we believe are reasonable precautions to prevent accidental and/or malicious disruption of these services, there can be no assurance that our preventive measures will preclude failure of the information technology,
web-based
and electronic customer service systems upon which our business depends. Our systems might also be damaged by natural or
man-made
events or by computer viruses, physical or electronics
break-ins,
cyber-attacks and similar disruptions affecting the global Internet. Disruption of these systems could adversely affect our ability to operate our business and to serve our customers, thereby negatively affecting our financial performance.
In addition, in the course of our operations, we receive confidential information from and about our customers, vendors, partners and employees. Although we take what we believe are reasonable precautions to protect such information from disclosure to or interruption, there are no guarantees our precautions will prevent accidental or malicious access to such information. In the event of such unauthorized access, our reputation could be adversely affected, customers and others may not entrust us with their confidential information, which would negatively affect our operations, and we may incur costs to remedy the breach. Furthermore, the loss of confidential information of third parties may result in legal claims against us, in which case we will incur additional costs and expenses to defend such litigation.
Moreover, many jurisdictions have proposed stringent regulations concerning data privacy, and such regulations may impose additional legal requirements that make our operations more expensive and/or less efficient. In addition, should we experience a breakdown in our systems or failure in our precautions that results in a violation of such regulations, we may suffer adverse customer reaction and face governmental penalties.
Intellectual property disputes could result in lengthy and costly arbitration, litigation or licensing expenses or prevent us from providing services to customers.
As is typical in the semiconductor industry, we or our customers may receive claims of infringement from time to time or otherwise become aware of potentially relevant patents or other intellectual property rights held by other parties that may cover some of our technology, products and services or those of our end customers. The semiconductor industry is characterized by vigorous protection and pursuit of intellectual property rights which has resulted in protracted and expensive arbitration and litigation for many companies.
Any litigation or arbitration regarding patents or other intellectual property could be costly and time consuming and could divert our management and key personnel from our business operations. We have in the past and may from time to time in the future become involved in litigation that requires our management to commit significant resources and time.
Because of the complexity of the technology involved and the uncertainty of litigation generally, any intellectual property arbitration or litigation involves significant risks. Any claim of intellectual property infringement against us may require us to:
 
   
incur substantial legal and personnel expenses to defend the claims or to negotiate for a settlement of claims;
 
   
pay substantial damages or settlement to the party claiming infringement;
 
   
refrain from further development or sale of our products;
 
   
enter into costly royalty or license agreements that might not be available on commercially reasonable terms or at all;
 
15

   
cross-license our technology with a competitor to resolve an infringement claim, which could weaken our ability to compete with that competitor;
 
   
indemnify our distributors, end customers, licensees and others from the costs of and damages of infringement claims; and
 
   
curtail or modify our operations in response to regulatory inquiries relating to the alleged infringement, which may result in additional costs and expenses.
In addition, because we have a global operation, we may be subject to intellectual property disputes and litigation in foreign jurisdictions with divergent laws and practices, which will make it more costly and time consuming for us to initiate or defend such litigations. Furthermore, if we are engaged or involved in a high profile intellectual property dispute or litigation in foreign countries with stringent national security regulations, such as the U.S. and China, we may be subject to heightened scrutiny by government agencies in such countries, which may lead to adverse actions taken by such government agencies, including prolonged investigation and litigation, which can negatively affect our operations and damage our reputation. Any intellectual property claim or litigation could harm our business, results of operations, financial condition and prospects.
Geopolitical and economic conflicts between the United States and China may adversely affect our business
Geopolitical conflicts and tensions between the United States and China have threatened and destabilized trading relationships and economic activities between the two countries. Because we have operations in both countries, such conflicts and tensions may negatively impact our business. At various times during recent years, the United States and China have had disagreements over political and economic issues, including but not limited to, the recent imposition of tariffs by the U.S. on goods imported from China and to the U.S. government’s efforts to restrict transfer and sharing of technologies, including semiconductor technologies, between the two countries. In addition, the U.S. government may enact new and more restrictive export control regulations that may reduce our ability to ship and sell products to certain customers in China and Asia and increase our cost to implement additional measures to comply with such new regulations. In addition, disagreements between the United States and China with respect to their political, military or economic policies toward Taiwan may contribute to further controversies. These controversies and trade frictions could have a material adverse effect on our business by, among other things, making it more difficult for us to coordinate our operations between the United States and China, causing a reduction in the demand for our products by customers in the United States or China and reducing our profitability due to increasing cost of compliance.
Risks Related to the Common Shares and ADSs and Our Trading Markets
Restrictions on the ability to deposit common shares into our ADS program may adversely affect the liquidity and price of the ADSs.
The ability to deposit common shares into our ADS program is restricted by R.O.C. law. Under current R.O.C. law, no person or entity, including you and us, may deposit common shares into our ADS program without specific approval of the R.O.C. FSC except for the deposit of the common shares into our ADS program and for the issuance of additional ADSs in connection with:
 
  (A)
distribution of share dividends or free distribution of our common shares;
 
  (B)
exercise of the preemptive rights of ADS holders applicable to the common shares evidenced by ADSs in the event of capital increases for cash; or
 
  (C)
delivery of our common shares which are purchased in the domestic market in Taiwan directly by the investor or through the depositary or are already in the possession of the investor to the custodian for deposit into our ADS program, subject to the following conditions: (a) the
re-issuance
is permitted under the deposit agreement and custody agreement, (b) the depositary may accept deposit of those common shares and issue the corresponding number of ADSs with regard to such deposit only if the total number of ADSs outstanding after the issuance does not exceed the number of ADSs previously approved by the R.O.C. FSC, plus any ADSs issued pursuant to the events described in (A) and (B) above and (c) this deposit may only be made to the extent previously issued ADSs have been withdrawn.
As a result of the limited ability to deposit common shares into our ADS program, the prevailing market price of our ADSs on the NYSE may differ from the prevailing market price of the equivalent number of our common shares on the Taiwan Stock Exchange.
 
16

Holders of our ADSs will not have the same proposal or voting rights as the holders of our common shares, which may affect the value of your investment.
Except for treasury common shares and common shares held by our subsidiaries which meet certain criteria provided under the R.O.C. Company Act, each common share is generally entitled to one vote and no voting discount will be applied. However, except as described in this Annual Report and in the deposit agreement, holders of our ADSs will not be able to exercise voting rights attached to the common shares evidenced by our ADSs on an individual basis. Holders of our ADSs will appoint the depositary or its nominee as their representative to exercise the voting rights attached to the common shares represented by the ADSs. The voting rights attached to the common shares evidenced by our ADSs must be exercised as to all matters brought to a vote of shareholders collectively in the same manner.
Moreo