0001955520false2023FY0.25http://fasb.org/us-gaap/2023#SellingGeneralAndAdministrativeExpense12http://fasb.org/us-gaap/2023#OtherNonoperatingIncomeExpensehttp://fasb.org/us-gaap/2023#OtherNonoperatingIncomeExpense00019555202023-01-012023-12-3100019555202023-06-30iso4217:USD00019555202024-02-22xbrli:shares0001955520us-gaap:ProductMember2023-01-012023-12-310001955520us-gaap:ProductMember2022-01-012022-12-310001955520us-gaap:ProductMember2021-01-012021-12-310001955520us-gaap:ServiceMember2023-01-012023-12-310001955520us-gaap:ServiceMember2022-01-012022-12-310001955520us-gaap:ServiceMember2021-01-012021-12-3100019555202022-01-012022-12-3100019555202021-01-012021-12-31iso4217:USDxbrli:shares00019555202023-12-3100019555202022-12-310001955520us-gaap:CommonStockMember2020-12-310001955520us-gaap:AdditionalPaidInCapitalMember2020-12-310001955520us-gaap:RetainedEarningsMember2020-12-310001955520knf:CommonStockHeldBySubsidiaryMember2020-12-310001955520us-gaap:TreasuryStockCommonMember2020-12-310001955520us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-3100019555202020-12-310001955520us-gaap:RetainedEarningsMember2021-01-012021-12-310001955520us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-12-310001955520us-gaap:AdditionalPaidInCapitalMember2021-01-012021-12-310001955520us-gaap:CommonStockMember2021-12-310001955520us-gaap:AdditionalPaidInCapitalMember2021-12-310001955520us-gaap:RetainedEarningsMember2021-12-310001955520knf:CommonStockHeldBySubsidiaryMember2021-12-310001955520us-gaap:TreasuryStockCommonMember2021-12-310001955520us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-3100019555202021-12-310001955520us-gaap:RetainedEarningsMember2022-01-012022-12-310001955520us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-01-012022-12-310001955520us-gaap:AdditionalPaidInCapitalMember2022-01-012022-12-310001955520us-gaap:CommonStockMember2022-12-310001955520us-gaap:AdditionalPaidInCapitalMember2022-12-310001955520us-gaap:RetainedEarningsMember2022-12-310001955520knf:CommonStockHeldBySubsidiaryMember2022-12-310001955520us-gaap:TreasuryStockCommonMember2022-12-310001955520us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-12-310001955520us-gaap:RetainedEarningsMember2023-01-012023-12-310001955520us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-01-012023-12-310001955520us-gaap:AdditionalPaidInCapitalMember2023-01-012023-12-310001955520us-gaap:CommonStockMember2023-01-012023-12-310001955520knf:CommonStockHeldBySubsidiaryMember2023-01-012023-12-310001955520us-gaap:TreasuryStockCommonMember2023-01-012023-12-310001955520us-gaap:CommonStockMember2023-12-310001955520us-gaap:AdditionalPaidInCapitalMember2023-12-310001955520us-gaap:RetainedEarningsMember2023-12-310001955520knf:CommonStockHeldBySubsidiaryMember2023-12-310001955520us-gaap:TreasuryStockCommonMember2023-12-310001955520us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-12-31knf:stateknf:reportableSegment00019555202023-05-31xbrli:pure0001955520knf:KnifeRiverMember2023-05-3100019555202023-11-012023-11-300001955520us-gaap:RelatedPartyMember2023-01-012023-12-310001955520us-gaap:RelatedPartyMember2022-01-012022-12-310001955520us-gaap:RelatedPartyMember2021-01-012021-12-310001955520us-gaap:TradeAccountsReceivableMember2023-12-310001955520us-gaap:TradeAccountsReceivableMember2022-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:PacificMember2021-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:NorthwestMember2021-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:MountainMember2021-12-310001955520knf:NorthCentralMemberus-gaap:TradeAccountsReceivableMember2021-12-310001955520us-gaap:TradeAccountsReceivableMemberus-gaap:CorporateAndOtherMember2021-12-310001955520us-gaap:TradeAccountsReceivableMember2021-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:PacificMember2022-01-012022-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:NorthwestMember2022-01-012022-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:MountainMember2022-01-012022-12-310001955520knf:NorthCentralMemberus-gaap:TradeAccountsReceivableMember2022-01-012022-12-310001955520us-gaap:TradeAccountsReceivableMemberus-gaap:CorporateAndOtherMember2022-01-012022-12-310001955520us-gaap:TradeAccountsReceivableMember2022-01-012022-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:PacificMember2022-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:NorthwestMember2022-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:MountainMember2022-12-310001955520knf:NorthCentralMemberus-gaap:TradeAccountsReceivableMember2022-12-310001955520us-gaap:TradeAccountsReceivableMemberus-gaap:CorporateAndOtherMember2022-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:PacificMember2023-01-012023-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:NorthwestMember2023-01-012023-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:MountainMember2023-01-012023-12-310001955520knf:NorthCentralMemberus-gaap:TradeAccountsReceivableMember2023-01-012023-12-310001955520us-gaap:TradeAccountsReceivableMemberus-gaap:CorporateAndOtherMember2023-01-012023-12-310001955520us-gaap:TradeAccountsReceivableMember2023-01-012023-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:PacificMember2023-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:NorthwestMember2023-12-310001955520us-gaap:TradeAccountsReceivableMemberknf:MountainMember2023-12-310001955520knf:NorthCentralMemberus-gaap:TradeAccountsReceivableMember2023-12-310001955520us-gaap:TradeAccountsReceivableMemberus-gaap:CorporateAndOtherMember2023-12-310001955520knf:JointVentureProportionateConsolidationMember2023-01-012023-12-310001955520knf:JointVentureProportionateConsolidationMember2022-01-012022-12-310001955520knf:JointVentureProportionateConsolidationMember2021-01-012021-12-310001955520knf:JointVentureProportionateConsolidationMember2023-12-310001955520knf:JointVentureProportionateConsolidationMember2022-12-310001955520knf:JointVentureProportionateConsolidationMember2021-12-310001955520knf:PacificSegmentMemberknf:AggregatesMember2023-01-012023-12-310001955520knf:AggregatesMemberknf:NorthwestSegmentMember2023-01-012023-12-310001955520knf:AggregatesMemberknf:MountainSegmentMember2023-01-012023-12-310001955520knf:AggregatesMemberknf:CentralSegmentMember2023-01-012023-12-310001955520knf:AggregatesMemberknf:EnergyServicesSegmentMember2023-01-012023-12-310001955520knf:AggregatesMemberknf:CorporateServicesSegmentMember2023-01-012023-12-310001955520knf:AggregatesMember2023-01-012023-12-310001955520knf:PacificSegmentMemberknf:ReadyMixConcreteMember2023-01-012023-12-310001955520knf:NorthwestSegmentMemberknf:ReadyMixConcreteMember2023-01-012023-12-310001955520knf:MountainSegmentMemberknf:ReadyMixConcreteMember2023-01-012023-12-310001955520knf:CentralSegmentMemberknf:ReadyMixConcreteMember2023-01-012023-12-310001955520knf:ReadyMixConcreteMemberknf:EnergyServicesSegmentMember2023-01-012023-12-310001955520knf:ReadyMixConcreteMemberknf:CorporateServicesSegmentMember2023-01-012023-12-310001955520knf:ReadyMixConcreteMember2023-01-012023-12-310001955520knf:PacificSegmentMemberknf:AsphaltMember2023-01-012023-12-310001955520knf:AsphaltMemberknf:NorthwestSegmentMember2023-01-012023-12-310001955520knf:MountainSegmentMemberknf:AsphaltMember2023-01-012023-12-310001955520knf:AsphaltMemberknf:CentralSegmentMember2023-01-012023-12-310001955520knf:AsphaltMemberknf:EnergyServicesSegmentMember2023-01-012023-12-310001955520knf:AsphaltMemberknf:CorporateServicesSegmentMember2023-01-012023-12-310001955520knf:AsphaltMember2023-01-012023-12-310001955520knf:PacificSegmentMemberknf:LiquidAsphaltMember2023-01-012023-12-310001955520knf:NorthwestSegmentMemberknf:LiquidAsphaltMember2023-01-012023-12-310001955520knf:MountainSegmentMemberknf:LiquidAsphaltMember2023-01-012023-12-310001955520knf:CentralSegmentMemberknf:LiquidAsphaltMember2023-01-012023-12-310001955520knf:EnergyServicesSegmentMemberknf:LiquidAsphaltMember2023-01-012023-12-310001955520knf:CorporateServicesSegmentMemberknf:LiquidAsphaltMember2023-01-012023-12-310001955520knf:LiquidAsphaltMember2023-01-012023-12-310001955520knf:PacificSegmentMemberknf:OtherMember2023-01-012023-12-310001955520knf:NorthwestSegmentMemberknf:OtherMember2023-01-012023-12-310001955520knf:MountainSegmentMemberknf:OtherMember2023-01-012023-12-310001955520knf:CentralSegmentMemberknf:OtherMember2023-01-012023-12-310001955520knf:OtherMemberknf:EnergyServicesSegmentMember2023-01-012023-12-310001955520knf:OtherMemberknf:CorporateServicesSegmentMember2023-01-012023-12-310001955520knf:OtherMember2023-01-012023-12-310001955520knf:PacificSegmentMemberknf:ContractingServicesPublicSectorMember2023-01-012023-12-310001955520knf:ContractingServicesPublicSectorMemberknf:NorthwestSegmentMember2023-01-012023-12-310001955520knf:MountainSegmentMemberknf:ContractingServicesPublicSectorMember2023-01-012023-12-310001955520knf:ContractingServicesPublicSectorMemberknf:CentralSegmentMember2023-01-012023-12-310001955520knf:ContractingServicesPublicSectorMemberknf:EnergyServicesSegmentMember2023-01-012023-12-310001955520knf:ContractingServicesPublicSectorMemberknf:CorporateServicesSegmentMember2023-01-012023-12-310001955520knf:ContractingServicesPublicSectorMember2023-01-012023-12-310001955520knf:PacificSegmentMemberknf:ContractingServicesPrivateSectorMember2023-01-012023-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:NorthwestSegmentMember2023-01-012023-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:MountainSegmentMember2023-01-012023-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:CentralSegmentMember2023-01-012023-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:EnergyServicesSegmentMember2023-01-012023-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:CorporateServicesSegmentMember2023-01-012023-12-310001955520knf:ContractingServicesPrivateSectorMember2023-01-012023-12-310001955520knf:PacificSegmentMemberknf:InternalSalesMember2023-01-012023-12-310001955520knf:NorthwestSegmentMemberknf:InternalSalesMember2023-01-012023-12-310001955520knf:MountainSegmentMemberknf:InternalSalesMember2023-01-012023-12-310001955520knf:CentralSegmentMemberknf:InternalSalesMember2023-01-012023-12-310001955520knf:InternalSalesMemberknf:EnergyServicesSegmentMember2023-01-012023-12-310001955520knf:InternalSalesMemberknf:CorporateServicesSegmentMember2023-01-012023-12-310001955520knf:InternalSalesMember2023-01-012023-12-310001955520knf:PacificSegmentMember2023-01-012023-12-310001955520knf:NorthwestSegmentMember2023-01-012023-12-310001955520knf:MountainSegmentMember2023-01-012023-12-310001955520knf:CentralSegmentMember2023-01-012023-12-310001955520knf:EnergyServicesSegmentMember2023-01-012023-12-310001955520knf:CorporateServicesSegmentMember2023-01-012023-12-310001955520knf:PacificSegmentMemberknf:AggregatesMember2022-01-012022-12-310001955520knf:AggregatesMemberknf:NorthwestSegmentMember2022-01-012022-12-310001955520knf:AggregatesMemberknf:MountainSegmentMember2022-01-012022-12-310001955520knf:AggregatesMemberknf:CentralSegmentMember2022-01-012022-12-310001955520knf:AggregatesMemberknf:EnergyServicesSegmentMember2022-01-012022-12-310001955520knf:AggregatesMemberknf:CorporateServicesSegmentMember2022-01-012022-12-310001955520knf:AggregatesMember2022-01-012022-12-310001955520knf:PacificSegmentMemberknf:ReadyMixConcreteMember2022-01-012022-12-310001955520knf:NorthwestSegmentMemberknf:ReadyMixConcreteMember2022-01-012022-12-310001955520knf:MountainSegmentMemberknf:ReadyMixConcreteMember2022-01-012022-12-310001955520knf:CentralSegmentMemberknf:ReadyMixConcreteMember2022-01-012022-12-310001955520knf:ReadyMixConcreteMemberknf:EnergyServicesSegmentMember2022-01-012022-12-310001955520knf:ReadyMixConcreteMemberknf:CorporateServicesSegmentMember2022-01-012022-12-310001955520knf:ReadyMixConcreteMember2022-01-012022-12-310001955520knf:PacificSegmentMemberknf:AsphaltMember2022-01-012022-12-310001955520knf:AsphaltMemberknf:NorthwestSegmentMember2022-01-012022-12-310001955520knf:MountainSegmentMemberknf:AsphaltMember2022-01-012022-12-310001955520knf:AsphaltMemberknf:CentralSegmentMember2022-01-012022-12-310001955520knf:AsphaltMemberknf:EnergyServicesSegmentMember2022-01-012022-12-310001955520knf:AsphaltMemberknf:CorporateServicesSegmentMember2022-01-012022-12-310001955520knf:AsphaltMember2022-01-012022-12-310001955520knf:PacificSegmentMemberknf:LiquidAsphaltMember2022-01-012022-12-310001955520knf:NorthwestSegmentMemberknf:LiquidAsphaltMember2022-01-012022-12-310001955520knf:MountainSegmentMemberknf:LiquidAsphaltMember2022-01-012022-12-310001955520knf:CentralSegmentMemberknf:LiquidAsphaltMember2022-01-012022-12-310001955520knf:EnergyServicesSegmentMemberknf:LiquidAsphaltMember2022-01-012022-12-310001955520knf:CorporateServicesSegmentMemberknf:LiquidAsphaltMember2022-01-012022-12-310001955520knf:LiquidAsphaltMember2022-01-012022-12-310001955520knf:PacificSegmentMemberknf:OtherMember2022-01-012022-12-310001955520knf:NorthwestSegmentMemberknf:OtherMember2022-01-012022-12-310001955520knf:MountainSegmentMemberknf:OtherMember2022-01-012022-12-310001955520knf:CentralSegmentMemberknf:OtherMember2022-01-012022-12-310001955520knf:OtherMemberknf:EnergyServicesSegmentMember2022-01-012022-12-310001955520knf:OtherMemberknf:CorporateServicesSegmentMember2022-01-012022-12-310001955520knf:OtherMember2022-01-012022-12-310001955520knf:PacificSegmentMemberknf:ContractingServicesPublicSectorMember2022-01-012022-12-310001955520knf:ContractingServicesPublicSectorMemberknf:NorthwestSegmentMember2022-01-012022-12-310001955520knf:MountainSegmentMemberknf:ContractingServicesPublicSectorMember2022-01-012022-12-310001955520knf:ContractingServicesPublicSectorMemberknf:CentralSegmentMember2022-01-012022-12-310001955520knf:ContractingServicesPublicSectorMemberknf:EnergyServicesSegmentMember2022-01-012022-12-310001955520knf:ContractingServicesPublicSectorMemberknf:CorporateServicesSegmentMember2022-01-012022-12-310001955520knf:ContractingServicesPublicSectorMember2022-01-012022-12-310001955520knf:PacificSegmentMemberknf:ContractingServicesPrivateSectorMember2022-01-012022-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:NorthwestSegmentMember2022-01-012022-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:MountainSegmentMember2022-01-012022-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:CentralSegmentMember2022-01-012022-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:EnergyServicesSegmentMember2022-01-012022-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:CorporateServicesSegmentMember2022-01-012022-12-310001955520knf:ContractingServicesPrivateSectorMember2022-01-012022-12-310001955520knf:PacificSegmentMemberknf:InternalSalesMember2022-01-012022-12-310001955520knf:NorthwestSegmentMemberknf:InternalSalesMember2022-01-012022-12-310001955520knf:MountainSegmentMemberknf:InternalSalesMember2022-01-012022-12-310001955520knf:CentralSegmentMemberknf:InternalSalesMember2022-01-012022-12-310001955520knf:InternalSalesMemberknf:EnergyServicesSegmentMember2022-01-012022-12-310001955520knf:InternalSalesMemberknf:CorporateServicesSegmentMember2022-01-012022-12-310001955520knf:InternalSalesMember2022-01-012022-12-310001955520knf:PacificSegmentMember2022-01-012022-12-310001955520knf:NorthwestSegmentMember2022-01-012022-12-310001955520knf:MountainSegmentMember2022-01-012022-12-310001955520knf:CentralSegmentMember2022-01-012022-12-310001955520knf:EnergyServicesSegmentMember2022-01-012022-12-310001955520knf:CorporateServicesSegmentMember2022-01-012022-12-310001955520knf:PacificSegmentMemberknf:AggregatesMember2021-01-012021-12-310001955520knf:AggregatesMemberknf:NorthwestSegmentMember2021-01-012021-12-310001955520knf:AggregatesMemberknf:MountainSegmentMember2021-01-012021-12-310001955520knf:AggregatesMemberknf:CentralSegmentMember2021-01-012021-12-310001955520knf:AggregatesMemberknf:EnergyServicesSegmentMember2021-01-012021-12-310001955520knf:AggregatesMemberknf:CorporateServicesSegmentMember2021-01-012021-12-310001955520knf:AggregatesMember2021-01-012021-12-310001955520knf:PacificSegmentMemberknf:ReadyMixConcreteMember2021-01-012021-12-310001955520knf:NorthwestSegmentMemberknf:ReadyMixConcreteMember2021-01-012021-12-310001955520knf:MountainSegmentMemberknf:ReadyMixConcreteMember2021-01-012021-12-310001955520knf:CentralSegmentMemberknf:ReadyMixConcreteMember2021-01-012021-12-310001955520knf:ReadyMixConcreteMemberknf:EnergyServicesSegmentMember2021-01-012021-12-310001955520knf:ReadyMixConcreteMemberknf:CorporateServicesSegmentMember2021-01-012021-12-310001955520knf:ReadyMixConcreteMember2021-01-012021-12-310001955520knf:PacificSegmentMemberknf:AsphaltMember2021-01-012021-12-310001955520knf:AsphaltMemberknf:NorthwestSegmentMember2021-01-012021-12-310001955520knf:MountainSegmentMemberknf:AsphaltMember2021-01-012021-12-310001955520knf:AsphaltMemberknf:CentralSegmentMember2021-01-012021-12-310001955520knf:AsphaltMemberknf:EnergyServicesSegmentMember2021-01-012021-12-310001955520knf:AsphaltMemberknf:CorporateServicesSegmentMember2021-01-012021-12-310001955520knf:AsphaltMember2021-01-012021-12-310001955520knf:PacificSegmentMemberknf:LiquidAsphaltMember2021-01-012021-12-310001955520knf:NorthwestSegmentMemberknf:LiquidAsphaltMember2021-01-012021-12-310001955520knf:MountainSegmentMemberknf:LiquidAsphaltMember2021-01-012021-12-310001955520knf:CentralSegmentMemberknf:LiquidAsphaltMember2021-01-012021-12-310001955520knf:EnergyServicesSegmentMemberknf:LiquidAsphaltMember2021-01-012021-12-310001955520knf:CorporateServicesSegmentMemberknf:LiquidAsphaltMember2021-01-012021-12-310001955520knf:LiquidAsphaltMember2021-01-012021-12-310001955520knf:PacificSegmentMemberknf:OtherMember2021-01-012021-12-310001955520knf:NorthwestSegmentMemberknf:OtherMember2021-01-012021-12-310001955520knf:MountainSegmentMemberknf:OtherMember2021-01-012021-12-310001955520knf:CentralSegmentMemberknf:OtherMember2021-01-012021-12-310001955520knf:OtherMemberknf:EnergyServicesSegmentMember2021-01-012021-12-310001955520knf:OtherMemberknf:CorporateServicesSegmentMember2021-01-012021-12-310001955520knf:OtherMember2021-01-012021-12-310001955520knf:PacificSegmentMemberknf:ContractingServicesPublicSectorMember2021-01-012021-12-310001955520knf:ContractingServicesPublicSectorMemberknf:NorthwestSegmentMember2021-01-012021-12-310001955520knf:MountainSegmentMemberknf:ContractingServicesPublicSectorMember2021-01-012021-12-310001955520knf:ContractingServicesPublicSectorMemberknf:CentralSegmentMember2021-01-012021-12-310001955520knf:ContractingServicesPublicSectorMemberknf:EnergyServicesSegmentMember2021-01-012021-12-310001955520knf:ContractingServicesPublicSectorMemberknf:CorporateServicesSegmentMember2021-01-012021-12-310001955520knf:ContractingServicesPublicSectorMember2021-01-012021-12-310001955520knf:PacificSegmentMemberknf:ContractingServicesPrivateSectorMember2021-01-012021-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:NorthwestSegmentMember2021-01-012021-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:MountainSegmentMember2021-01-012021-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:CentralSegmentMember2021-01-012021-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:EnergyServicesSegmentMember2021-01-012021-12-310001955520knf:ContractingServicesPrivateSectorMemberknf:CorporateServicesSegmentMember2021-01-012021-12-310001955520knf:ContractingServicesPrivateSectorMember2021-01-012021-12-310001955520knf:PacificSegmentMemberknf:InternalSalesMember2021-01-012021-12-310001955520knf:NorthwestSegmentMemberknf:InternalSalesMember2021-01-012021-12-310001955520knf:MountainSegmentMemberknf:InternalSalesMember2021-01-012021-12-310001955520knf:CentralSegmentMemberknf:InternalSalesMember2021-01-012021-12-310001955520knf:InternalSalesMemberknf:EnergyServicesSegmentMember2021-01-012021-12-310001955520knf:InternalSalesMemberknf:CorporateServicesSegmentMember2021-01-012021-12-310001955520knf:InternalSalesMember2021-01-012021-12-310001955520knf:PacificSegmentMember2021-01-012021-12-310001955520knf:NorthwestSegmentMember2021-01-012021-12-310001955520knf:MountainSegmentMember2021-01-012021-12-310001955520knf:CentralSegmentMember2021-01-012021-12-310001955520knf:EnergyServicesSegmentMember2021-01-012021-12-310001955520knf:CorporateServicesSegmentMember2021-01-012021-12-3100019555202024-01-012023-12-3100019555202025-01-012023-12-3100019555202026-01-012023-12-310001955520us-gaap:LandMember2023-12-310001955520us-gaap:LandMember2022-12-310001955520knf:AggregateReservesMember2023-12-310001955520knf:AggregateReservesMember2022-12-310001955520us-gaap:BuildingAndBuildingImprovementsMember2023-12-310001955520us-gaap:BuildingAndBuildingImprovementsMember2022-12-310001955520knf:MachineryVehiclesAndEquipmentMember2023-12-310001955520knf:MachineryVehiclesAndEquipmentMember2022-12-310001955520us-gaap:ConstructionInProgressMember2023-12-310001955520us-gaap:ConstructionInProgressMember2022-12-310001955520knf:PacificSegmentMember2022-12-310001955520knf:PacificSegmentMember2023-12-310001955520knf:NorthwestSegmentMember2022-12-310001955520knf:NorthwestSegmentMember2023-12-310001955520knf:MountainSegmentMember2022-12-310001955520knf:MountainSegmentMember2023-12-310001955520knf:NorthCentralSegmentMember2022-12-310001955520knf:NorthCentralSegmentMember2023-01-012023-12-310001955520knf:NorthCentralSegmentMember2023-12-310001955520knf:SouthSegmentMember2022-12-310001955520knf:SouthSegmentMember2023-01-012023-12-310001955520knf:SouthSegmentMember2023-12-310001955520knf:EnergyServicesSegmentMember2022-12-310001955520knf:EnergyServicesSegmentMember2023-12-310001955520knf:PacificSegmentMember2021-12-310001955520knf:NorthwestSegmentMember2021-12-310001955520knf:MountainSegmentMember2021-12-310001955520knf:NorthCentralSegmentMember2021-12-310001955520knf:NorthCentralSegmentMember2022-01-012022-12-310001955520knf:SouthSegmentMember2021-12-310001955520knf:SouthSegmentMember2022-01-012022-12-310001955520knf:EnergyServicesSegmentMember2021-12-310001955520srt:MinimumMemberus-gaap:CustomerRelationshipsMember2023-12-310001955520srt:MaximumMemberus-gaap:CustomerRelationshipsMember2023-12-310001955520us-gaap:CustomerRelationshipsMember2023-12-310001955520us-gaap:CustomerRelationshipsMember2022-12-310001955520us-gaap:NoncompeteAgreementsMembersrt:MinimumMember2023-12-310001955520us-gaap:NoncompeteAgreementsMembersrt:MaximumMember2023-12-310001955520us-gaap:NoncompeteAgreementsMember2023-12-310001955520us-gaap:NoncompeteAgreementsMember2022-12-310001955520srt:MinimumMemberus-gaap:OtherIntangibleAssetsMember2023-12-310001955520srt:MaximumMemberus-gaap:OtherIntangibleAssetsMember2023-12-310001955520us-gaap:OtherIntangibleAssetsMember2023-12-310001955520us-gaap:OtherIntangibleAssetsMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CashSurrenderValueMemberus-gaap:FairValueInputsLevel2Member2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CashSurrenderValueMemberus-gaap:FairValueInputsLevel2Member2022-12-310001955520us-gaap:MoneyMarketFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310001955520us-gaap:MoneyMarketFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001955520us-gaap:MoneyMarketFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-12-310001955520us-gaap:MoneyMarketFundsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CashSurrenderValueMemberus-gaap:FairValueInputsLevel1Member2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CashSurrenderValueMember2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CashSurrenderValueMember2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMember2023-12-310001955520us-gaap:MoneyMarketFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:MoneyMarketFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310001955520us-gaap:MoneyMarketFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2022-12-310001955520us-gaap:MoneyMarketFundsMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CashSurrenderValueMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CashSurrenderValueMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CashSurrenderValueMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMember2022-12-310001955520us-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001955520us-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001955520knf:A7.24TermLoanAgreementDue2028Memberus-gaap:LineOfCreditMember2023-12-310001955520us-gaap:SeniorNotesMemberknf:A7.75SeniorNotesDue2031Member2023-12-310001955520us-gaap:NotesPayableOtherPayablesMemberknf:OtherNotesDue2061Member2023-12-310001955520us-gaap:SeniorNotesMemberknf:A7.75SeniorNotesDue2031Member2023-04-250001955520knf:CreditAgreementMemberus-gaap:LineOfCreditMember2023-05-312023-05-310001955520us-gaap:SecuredDebtMemberknf:CreditAgreementMemberus-gaap:LineOfCreditMember2023-05-310001955520knf:CreditAgreementMemberus-gaap:RevolvingCreditFacilityMemberus-gaap:LineOfCreditMember2023-05-310001955520us-gaap:SecuredDebtMemberknf:CreditAgreementMemberus-gaap:LineOfCreditMember2023-12-310001955520knf:CreditAgreementMemberus-gaap:RevolvingCreditFacilityMemberus-gaap:LineOfCreditMember2023-12-310001955520knf:CreditAgreementMemberus-gaap:LetterOfCreditMemberus-gaap:LineOfCreditMember2023-12-310001955520knf:CreditAgreementMemberus-gaap:FederalFundsEffectiveSwapRateMemberus-gaap:LineOfCreditMember2023-01-012023-12-310001955520knf:CreditAgreementMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberus-gaap:LineOfCreditMember2023-01-012023-12-310001955520knf:CreditAgreementMemberknf:SOFRPlus1.1Membersrt:MinimumMemberus-gaap:LineOfCreditMember2023-01-012023-12-310001955520knf:CreditAgreementMemberknf:SOFRPlus1.1Membersrt:MaximumMemberus-gaap:LineOfCreditMember2023-01-012023-12-310001955520knf:CreditAgreementMembersrt:MinimumMemberknf:SOFRPlusRateDeterminedByInterestPeriodMemberus-gaap:LineOfCreditMember2023-01-012023-12-310001955520knf:CreditAgreementMemberknf:SOFRPlusRateDeterminedByInterestPeriodMembersrt:MaximumMemberus-gaap:LineOfCreditMember2023-01-012023-12-310001955520knf:CreditAgreementMembersrt:MinimumMemberus-gaap:RevolvingCreditFacilityMemberus-gaap:LineOfCreditMember2023-01-012023-12-310001955520knf:CreditAgreementMemberus-gaap:RevolvingCreditFacilityMembersrt:MaximumMemberus-gaap:LineOfCreditMember2023-01-012023-12-310001955520us-gaap:SecuredDebtMemberknf:CreditAgreementMemberus-gaap:LineOfCreditMember2023-01-012023-12-310001955520us-gaap:EquipmentMembersrt:MaximumMember2023-12-310001955520us-gaap:VehiclesMembersrt:MaximumMember2023-12-310001955520us-gaap:BuildingMembersrt:MinimumMember2023-12-3100019555202023-05-312023-05-310001955520us-gaap:RestrictedStockUnitsRSUMember2023-05-312023-05-310001955520us-gaap:PerformanceSharesMember2023-05-312023-05-310001955520knf:RestrictedStockUnitsOtherAwardsMember2023-12-310001955520us-gaap:StockCompensationPlanMember2023-01-012023-12-310001955520us-gaap:RestrictedStockUnitsRSUMember2023-01-012023-12-310001955520us-gaap:RestrictedStockUnitsRSUMemberknf:A20222024May2023Member2023-12-310001955520us-gaap:RestrictedStockUnitsRSUMemberknf:A20232025May2023Member2023-12-310001955520us-gaap:RestrictedStockUnitsRSUMemberknf:A20232025July2023Member2023-12-310001955520us-gaap:PerformanceSharesMember2022-01-012022-12-310001955520knf:PerformanceSharesPerformanceConditionsMembersrt:MinimumMember2022-12-310001955520knf:PerformanceSharesPerformanceConditionsMembersrt:MaximumMember2022-12-310001955520us-gaap:PerformanceSharesMember2021-01-012021-12-310001955520us-gaap:PerformanceSharesMembersrt:MinimumMember2022-01-012022-12-310001955520us-gaap:PerformanceSharesMembersrt:MaximumMember2022-01-012022-12-310001955520us-gaap:PerformanceSharesMembersrt:MinimumMember2021-01-012021-12-310001955520us-gaap:PerformanceSharesMembersrt:MaximumMember2021-01-012021-12-310001955520knf:PerformanceSharesMarketConditionsMembersrt:MinimumMember2022-12-310001955520knf:PerformanceSharesMarketConditionsMembersrt:MaximumMember2022-12-310001955520knf:PerformanceSharesPerformanceConditionsMember2022-01-012022-12-310001955520knf:PerformanceSharesPerformanceConditionsMember2021-01-012021-12-310001955520us-gaap:PerformanceSharesMember2022-12-310001955520us-gaap:RestrictedStockUnitsRSUMember2022-12-310001955520us-gaap:PerformanceSharesMember2023-01-012023-05-300001955520us-gaap:RestrictedStockUnitsRSUMember2023-01-012023-05-300001955520us-gaap:PerformanceSharesMember2023-05-300001955520us-gaap:RestrictedStockUnitsRSUMember2023-05-300001955520us-gaap:PerformanceSharesMember2023-05-312023-12-310001955520us-gaap:RestrictedStockUnitsRSUMember2023-05-312023-12-310001955520us-gaap:PerformanceSharesMember2023-12-310001955520us-gaap:RestrictedStockUnitsRSUMember2023-12-310001955520us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-12-310001955520us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-12-310001955520us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-01-012022-12-310001955520us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-01-012022-12-310001955520us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-12-310001955520us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-12-310001955520us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2023-01-012023-12-310001955520us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-01-012023-12-310001955520us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2023-12-310001955520us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-12-310001955520us-gaap:InterestRateContractMemberus-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2023-01-012023-12-310001955520us-gaap:InterestRateContractMemberus-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-01-012022-12-310001955520us-gaap:InterestRateContractMemberus-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-01-012021-12-310001955520us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2023-01-012023-12-310001955520us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2022-01-012022-12-310001955520us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-01-012021-12-310001955520us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-01-012021-12-310001955520us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2023-01-012023-12-310001955520us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2022-01-012022-12-310001955520us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-01-012021-12-310001955520knf:PacificSegmentMemberus-gaap:OperatingSegmentsMember2023-01-012023-12-310001955520knf:PacificSegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-12-310001955520knf:PacificSegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-12-310001955520knf:NorthwestSegmentMemberus-gaap:OperatingSegmentsMember2023-01-012023-12-310001955520knf:NorthwestSegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-12-310001955520knf:NorthwestSegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-12-310001955520knf:MountainSegmentMemberus-gaap:OperatingSegmentsMember2023-01-012023-12-310001955520knf:MountainSegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-12-310001955520knf:MountainSegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-12-310001955520knf:CentralSegmentMemberus-gaap:OperatingSegmentsMember2023-01-012023-12-310001955520knf:CentralSegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-12-310001955520knf:CentralSegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-12-310001955520us-gaap:OperatingSegmentsMemberknf:EnergyServicesSegmentMember2023-01-012023-12-310001955520us-gaap:OperatingSegmentsMemberknf:EnergyServicesSegmentMember2022-01-012022-12-310001955520us-gaap:OperatingSegmentsMemberknf:EnergyServicesSegmentMember2021-01-012021-12-310001955520us-gaap:OperatingSegmentsMemberknf:CorporateServicesSegmentMember2023-01-012023-12-310001955520us-gaap:OperatingSegmentsMemberknf:CorporateServicesSegmentMember2022-01-012022-12-310001955520us-gaap:OperatingSegmentsMemberknf:CorporateServicesSegmentMember2021-01-012021-12-310001955520knf:PacificSegmentMemberus-gaap:IntersegmentEliminationMember2023-01-012023-12-310001955520knf:PacificSegmentMemberus-gaap:IntersegmentEliminationMember2022-01-012022-12-310001955520knf:PacificSegmentMemberus-gaap:IntersegmentEliminationMember2021-01-012021-12-310001955520us-gaap:IntersegmentEliminationMemberknf:NorthwestSegmentMember2023-01-012023-12-310001955520us-gaap:IntersegmentEliminationMemberknf:NorthwestSegmentMember2022-01-012022-12-310001955520us-gaap:IntersegmentEliminationMemberknf:NorthwestSegmentMember2021-01-012021-12-310001955520us-gaap:IntersegmentEliminationMemberknf:MountainSegmentMember2023-01-012023-12-310001955520us-gaap:IntersegmentEliminationMemberknf:MountainSegmentMember2022-01-012022-12-310001955520us-gaap:IntersegmentEliminationMemberknf:MountainSegmentMember2021-01-012021-12-310001955520us-gaap:IntersegmentEliminationMemberknf:CentralSegmentMember2023-01-012023-12-310001955520us-gaap:IntersegmentEliminationMemberknf:CentralSegmentMember2022-01-012022-12-310001955520us-gaap:IntersegmentEliminationMemberknf:CentralSegmentMember2021-01-012021-12-310001955520us-gaap:IntersegmentEliminationMemberknf:EnergyServicesSegmentMember2023-01-012023-12-310001955520us-gaap:IntersegmentEliminationMemberknf:EnergyServicesSegmentMember2022-01-012022-12-310001955520us-gaap:IntersegmentEliminationMemberknf:EnergyServicesSegmentMember2021-01-012021-12-310001955520us-gaap:IntersegmentEliminationMemberknf:CorporateServicesSegmentMember2023-01-012023-12-310001955520us-gaap:IntersegmentEliminationMemberknf:CorporateServicesSegmentMember2022-01-012022-12-310001955520us-gaap:IntersegmentEliminationMemberknf:CorporateServicesSegmentMember2021-01-012021-12-310001955520us-gaap:IntersegmentEliminationMember2023-01-012023-12-310001955520us-gaap:IntersegmentEliminationMember2022-01-012022-12-310001955520us-gaap:IntersegmentEliminationMember2021-01-012021-12-310001955520knf:PacificSegmentMemberus-gaap:OperatingSegmentsMember2023-12-310001955520knf:PacificSegmentMemberus-gaap:OperatingSegmentsMember2022-12-310001955520knf:PacificSegmentMemberus-gaap:OperatingSegmentsMember2021-12-310001955520knf:NorthwestSegmentMemberus-gaap:OperatingSegmentsMember2023-12-310001955520knf:NorthwestSegmentMemberus-gaap:OperatingSegmentsMember2022-12-310001955520knf:NorthwestSegmentMemberus-gaap:OperatingSegmentsMember2021-12-310001955520knf:MountainSegmentMemberus-gaap:OperatingSegmentsMember2023-12-310001955520knf:MountainSegmentMemberus-gaap:OperatingSegmentsMember2022-12-310001955520knf:MountainSegmentMemberus-gaap:OperatingSegmentsMember2021-12-310001955520knf:CentralSegmentMemberus-gaap:OperatingSegmentsMember2023-12-310001955520knf:CentralSegmentMemberus-gaap:OperatingSegmentsMember2022-12-310001955520knf:CentralSegmentMemberus-gaap:OperatingSegmentsMember2021-12-310001955520us-gaap:OperatingSegmentsMemberknf:EnergyServicesSegmentMember2023-12-310001955520us-gaap:OperatingSegmentsMemberknf:EnergyServicesSegmentMember2022-12-310001955520us-gaap:OperatingSegmentsMemberknf:EnergyServicesSegmentMember2021-12-310001955520us-gaap:OperatingSegmentsMemberknf:CorporateServicesSegmentMember2023-12-310001955520us-gaap:OperatingSegmentsMemberknf:CorporateServicesSegmentMember2022-12-310001955520us-gaap:OperatingSegmentsMemberknf:CorporateServicesSegmentMember2021-12-310001955520us-gaap:OperatingSegmentsMember2023-01-012023-12-310001955520us-gaap:OperatingSegmentsMember2022-01-012022-12-310001955520us-gaap:OperatingSegmentsMember2021-01-012021-12-310001955520us-gaap:OperatingSegmentsMember2023-12-310001955520us-gaap:OperatingSegmentsMember2022-12-310001955520us-gaap:OperatingSegmentsMember2021-12-310001955520srt:ConsolidationEliminationsMember2023-12-310001955520srt:ConsolidationEliminationsMember2022-12-310001955520srt:ConsolidationEliminationsMember2021-12-310001955520us-gaap:StateAndLocalJurisdictionMember2023-12-310001955520us-gaap:StateAndLocalJurisdictionMember2022-12-310001955520us-gaap:DefinedBenefitPostretirementHealthCoverageMemberus-gaap:NonqualifiedPlanMemberus-gaap:UnderfundedPlanMember2011-01-010001955520us-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:PensionPlansDefinedBenefitMember2021-12-310001955520us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310001955520us-gaap:PensionPlansDefinedBenefitMember2023-01-012023-12-310001955520us-gaap:PensionPlansDefinedBenefitMember2022-01-012022-12-310001955520us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-12-310001955520us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-12-310001955520us-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-12-310001955520us-gaap:UnfundedPlanMemberus-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:PensionPlansDefinedBenefitMemberus-gaap:UnderfundedPlanMember2023-01-012023-12-310001955520us-gaap:PensionPlansDefinedBenefitMemberus-gaap:UnderfundedPlanMember2022-01-012022-12-310001955520us-gaap:PensionPlansDefinedBenefitMemberus-gaap:UnderfundedPlanMember2021-01-012021-12-310001955520us-gaap:UnderfundedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-12-310001955520us-gaap:UnderfundedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-12-310001955520us-gaap:UnderfundedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-12-310001955520us-gaap:UnfundedPlanMemberus-gaap:PensionPlansDefinedBenefitMember2023-01-012023-12-310001955520us-gaap:UnfundedPlanMemberus-gaap:PensionPlansDefinedBenefitMember2022-01-012022-12-310001955520us-gaap:UnfundedPlanMemberus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-12-310001955520us-gaap:UnfundedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-12-310001955520us-gaap:UnfundedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-12-310001955520us-gaap:UnfundedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-12-310001955520us-gaap:UnderfundedPlanMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:UnderfundedPlanMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:QualifiedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-12-310001955520us-gaap:QualifiedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:UnderfundedPlanMemberus-gaap:PensionPlansDefinedBenefitMember2023-01-012023-12-310001955520us-gaap:UnderfundedPlanMemberus-gaap:PensionPlansDefinedBenefitMember2022-01-012022-12-310001955520us-gaap:QualifiedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-12-310001955520us-gaap:QualifiedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-12-310001955520us-gaap:QualifiedPlanMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMembersrt:MinimumMember2023-12-310001955520us-gaap:QualifiedPlanMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMembersrt:MaximumMember2023-12-310001955520us-gaap:FixedIncomeSecuritiesMemberus-gaap:QualifiedPlanMembersrt:MinimumMember2023-12-310001955520us-gaap:FixedIncomeSecuritiesMemberus-gaap:QualifiedPlanMembersrt:MaximumMember2023-12-310001955520us-gaap:DefinedBenefitPostretirementHealthCoverageMember2023-12-310001955520us-gaap:DefinedBenefitPostretirementHealthCoverageMember2022-12-310001955520us-gaap:DefinedBenefitPostretirementHealthCoverageMember2023-01-012023-12-310001955520us-gaap:DefinedBenefitPostretirementHealthCoverageMember2022-01-012022-12-310001955520us-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:UnderfundedPlanMember2023-12-310001955520us-gaap:QualifiedPlanMemberus-gaap:UnderfundedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-12-310001955520us-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:NonqualifiedPlanMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2023-12-310001955520us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2023-12-310001955520us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:PensionPlansDefinedBenefitMemberus-gaap:CorporateDebtSecuritiesMember2023-12-310001955520us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsLargeCapMember2023-12-310001955520us-gaap:OtherInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel2Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2022-12-310001955520us-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310001955520us-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:CorporateDebtSecuritiesMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CorporateDebtSecuritiesMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:CorporateDebtSecuritiesMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:CorporateDebtSecuritiesMember2022-12-310001955520us-gaap:MunicipalBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:MunicipalBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310001955520us-gaap:MunicipalBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:MunicipalBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310001955520us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberknf:DefinedBenefitPlanPooledSeparateAccountsMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberknf:DefinedBenefitPlanPooledSeparateAccountsMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberknf:DefinedBenefitPlanPooledSeparateAccountsMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberknf:DefinedBenefitPlanPooledSeparateAccountsMember2022-12-310001955520us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310001955520us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:PensionPlansDefinedBenefitMemberus-gaap:CorporateDebtSecuritiesMember2022-12-310001955520us-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsLargeCapMember2022-12-310001955520knf:DefinedBenefitPlanPooledSeparateAccountsCashAndCashEquivalentsMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:OtherInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberknf:DefinedBenefitPlanInsuranceMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberknf:DefinedBenefitPlanInsuranceMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberknf:DefinedBenefitPlanInsuranceMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberknf:DefinedBenefitPlanInsuranceMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:CorporateDebtSecuritiesMember2022-12-310001955520us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:DefinedBenefitPlanEquitySecuritiesUsLargeCapMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:DefinedBenefitPlanEquitySecuritiesUsSmallCapMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310001955520us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2023-01-012023-12-310001955520us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2022-01-012022-12-310001955520us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2021-01-012021-12-310001955520us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2023-12-310001955520us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2022-12-310001955520us-gaap:NonqualifiedPlanMember2023-01-012023-12-310001955520us-gaap:NonqualifiedPlanMember2022-01-012022-12-310001955520us-gaap:NonqualifiedPlanMember2021-01-012021-12-310001955520knf:InsuranceContractsInvestmentsMember2023-12-310001955520knf:InsuranceContractsInvestmentsMember2022-12-310001955520knf:LifeInsuranceInvestmentsMember2023-12-310001955520knf:LifeInsuranceInvestmentsMember2022-12-310001955520us-gaap:OtherInvestmentsMember2023-12-310001955520us-gaap:OtherInvestmentsMember2022-12-310001955520knf:AlaskaLaborersEmployerRetirementFundMember2023-01-012023-12-310001955520knf:AlaskaLaborersEmployerRetirementFundMember2022-01-012022-12-310001955520knf:AlaskaLaborersEmployerRetirementFundMember2021-01-012021-12-310001955520knf:MinnesotaTeamstersConstructionDivisionPensionFundMember2023-01-012023-12-310001955520knf:MinnesotaTeamstersConstructionDivisionPensionFundMember2022-01-012022-12-310001955520knf:MinnesotaTeamstersConstructionDivisionPensionFundMember2021-01-012021-12-310001955520knf:PensionTrustFundForOperatingEngineersMember2023-01-012023-12-310001955520knf:PensionTrustFundForOperatingEngineersMember2022-01-012022-12-310001955520knf:PensionTrustFundForOperatingEngineersMember2021-01-012021-12-310001955520knf:WesternConferenceOfTeamstersPensionPlanMember2023-01-012023-12-310001955520knf:WesternConferenceOfTeamstersPensionPlanMember2022-01-012022-12-310001955520knf:WesternConferenceOfTeamstersPensionPlanMember2021-01-012021-12-310001955520us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-12-310001955520knf:LowerWillametteGroupMember2016-12-312016-12-31knf:responsibleParty00019555202017-01-310001955520us-gaap:LetterOfCreditMember2023-12-310001955520knf:CentennialMemberus-gaap:RelatedPartyMember2023-05-300001955520knf:CentennialMemberus-gaap:RelatedPartyMember2023-05-312023-05-310001955520us-gaap:RelatedPartyMember2023-05-312023-05-310001955520us-gaap:RelatedPartyMemberknf:CentennialTermLoanAgreementsMember2022-12-310001955520knf:CentennialSeniorNotesMemberus-gaap:RelatedPartyMember2022-12-310001955520knf:BorrowingArrangementsMemberus-gaap:RelatedPartyMember2022-12-310001955520us-gaap:RelatedPartyMember2022-12-3100019555202023-10-012023-12-31

For the fiscal year ended December 31, 2023

☐			TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _____________ to ______________

Commission file number 1-41642

(Exact name of registrant as specified in its charter)

1150 West Century Avenue

P.O. Box 5568

Bismarck, North Dakota 58506-5568

(Address of principal executive offices)

(Zip Code)

(701) 530-1400

(Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☐ No ☒.

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. 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 such files). Yes ☒ No ☐.

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act:

If an emerging growth company, 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. ☐

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. ☐

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ☐ No ☒.

State the aggregate market value of the voting common stock held by non-affiliates of the registrant as of June 30, 2023: $2,460,630,309.

Indicate the number of shares outstanding of the registrant's common stock, as of February 22, 2024: 56,578,406 shares.

Relevant portions of the registrant's 2024 Proxy Statement, to be filed no later than 120 days from December 31, 2023, are incorporated by reference in Part III, Items 10, 11, 12, 13 and 14 of this Annual Report on Form 10-K.

The following abbreviations and acronyms used in this Form 10-K are defined below:

This Annual Report contains forward-looking statements within the meaning of Section 21E of the Exchange Act. Forward-looking statements are all statements other than statements of historical fact, including without limitation those statements that are identified by the words "anticipates," "estimates," "expects," "intends," "plans," "predicts" and similar expressions, and include statements concerning plans, trends, objectives, goals, strategies, future events or performance, and underlying assumptions (many of which are based, in turn, upon further assumptions) and other statements that are other than statements of historical facts. From time to time, the Company may publish or otherwise make available forward-looking statements of this nature, including statements related to EDGE.

Forward-looking statements involve risks and uncertainties, which could cause actual results or outcomes to differ materially from those expressed. The Company's expectations, beliefs and projections are expressed in good faith and are believed by the Company to have a reasonable basis, including without limitation, management's examination of historical operating trends, data contained in the Company's records and other data available from third parties. Nonetheless, the Company's expectations, beliefs or projections may not be achieved or accomplished and changes in such assumptions and factors could cause actual future results to differ materially.

Any forward-looking statement contained in this document speaks only as of the date on which the statement is made, and the Company undertakes no obligation to update any forward-looking statement or statements to reflect events or circumstances that occur after the date on which the statement is made or to reflect the occurrence of unanticipated events, except as required by law. New factors emerge from time to time, and it is not possible for management to predict all the factors, nor can it assess the effect of each factor on the Company's business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statement. All forward-looking statements, whether written or oral and whether made by or on behalf of the Company, are expressly qualified by the risk factors and cautionary statements reported in the section entitled "Item 1A. Risk Factors" and subsequent filings with the SEC.

An investment in Knife River is subject to a number of risks. Set forth below is a high-level summary of some, but not all, of these risks. Please read the information in ”Item 1A. Risk Factors” for a more thorough description of these risks.

•Knife River operates in a highly competitive industry.

•Knife River may be unable to secure, permit or economically mine strategically located aggregate reserves.

•Knife River is exposed to risk of loss resulting from nonpayment and/or nonperformance by its customers and counterparties.

•The success of Knife River depends on the ability to execute on acquisitions and to successfully integrate acquired businesses and to retain key employees of acquired businesses.

•Technology disruptions or cyberattacks could adversely impact operations.

•Artificial intelligence presents risks and challenges that can impact the business.

•Knife River could experience temporary interruptions in business operations and incur additional costs as it further develops information technology infrastructure and transitions its data to its stand-alone systems.

•Knife River may be unable to protect its intellectual property.

•Knife River’s business is seasonal and subject to weather conditions that could adversely affect its operations.

•Significant changes in prices for commodities, labor, or other production and delivery inputs could negatively affect Knife River’s businesses.

•Supply chain disruptions may adversely affect Knife River’s operations.

•Knife River’s business is based in large part on government-funded infrastructure projects and building activities, and any reductions or reallocation of spending or related subsidies in these areas could have an adverse effect on the Company.

•Economic volatility affects Knife River’s operations, as well as the demand for its products and services.

•Pandemics, including COVID-19, may have a negative impact on Knife River’s business operations.

•Knife River may be negatively impacted by pending and/or future litigation, claims or investigations.

•Knife River’s operations could be negatively impacted by import tariffs and/or other government mandates.

•Knife River’s operations are subject to environmental laws and regulations.

•Knife River’s operations could be adversely impacted by climate change.

•Stakeholder actions and increased regulatory activity related to ESG could adversely impact the Company’s operations.

•Changes in tax law may negatively affect Knife River’s business.

•Knife River’s operations may be negatively affected if it is unable to obtain, develop and retain key personnel and skilled labor forces.

•Increasing costs associated with health care plans may adversely affect Knife River’s results of operations.

•Aggregate resource and reserve calculations are estimates and subject to uncertainty.

•Backlog may not accurately represent future revenue and gross margin.

•Knife River operates in a capital-intensive industry and is subject to capital market and interest rate risks.

•Financial market changes could impact Knife River’s defined benefit pension plans and obligations.

•Costs related to obligations under MEPPs could have a material negative effect on Knife River.

•Knife River has substantial indebtedness and may incur substantial additional indebtedness.

•A lowering or withdrawal of the ratings, outlook or watch assigned to Knife River or its debt by rating agencies may increase its future borrowing costs and reduce its access to capital.

•Knife River has minimal history of operating as an independent, public company.

•The Company could be subject to significant tax liabilities or be required to indemnify MDU Resources for material taxes, and other related amounts, in connection with the Separation.

•U.S. federal income tax consequences may restrict the Company’s ability to engage in certain desirable strategic or capital-raising transactions after the Separation.

•Knife River may not achieve some or all of the expected benefits of the Separation.

•Knife River or MDU Resources may fail to perform under various Separation agreements or the Company may fail to have necessary systems and services in place when such agreements expire.

•Failure to favorably resolve disputes that arise between Knife River and MDU Resources with respect to past and ongoing relationships.

•Following the Separation, certain members of management, directors and stockholders hold stock in both Knife River and MDU Resources, and as a result may face actual or potential conflicts of interest.

•Failure to maintain effective internal control over financial reporting in accordance with Section 404 of the Sarbanes-Oxley Act.

•As an independent, publicly traded company, the Company may not enjoy the same benefits that it did as a segment of MDU Resources.

•Knife River may be required to pay MDU Resources under certain indemnities related to the Separation.

•The trading market for Knife River common stock has existed only a short period following the separation, and the market price and trading volume of its common stock may fluctuate significantly.

•If securities or industry analysts do not publish research or publish misleading or unfavorable research about the Company’s business, Knife River’s stock price and trading volume could decline.

•Stockholder percentage of ownership in Knife River may be diluted in the future.

•Knife River cannot guarantee the timing, declaration, amount or payment of dividends, if any, on its common stock.

•Exclusive forum selection provisions in the Company’s amended and restated bylaws could discourage lawsuits against the Company and its directors and officers.

•Provisions in the Company’s amended and restated certificate of incorporation and amended and restated bylaws and Delaware law may prevent or delay an acquisition of Knife River.

Knife River is an aggregates-led construction materials and contracting services provider in the United States. The Company’s 1.1 billion tons of aggregate reserves provide the foundation for a vertically integrated business strategy with approximately 37 percent of its aggregates in 2023 being used internally to support value-added downstream products (ready-mix concrete and asphalt) and contracting services (heavy-civil construction, asphalt paving, concrete construction, site development and grading services, and in some segments the manufacturing of prestressed concrete products). Knife River is strategically focused on being the provider of choice in mid-size, high-growth markets. The Company is committed to continued growth and to delivering for its stakeholders—customers, communities, employees and stockholders—by executing on its four core values: People, Safety, Quality and the Environment.

Through its network of 180 active aggregate sites, 102 ready-mix plants and 56 asphalt plants, Knife River supplies construction materials and contracting services to customers in 14 states. Its construction materials are sold to public and private-sector customers, including federal, state and municipal governments, as well as industrial, commercial and residential developers and other private parties. Knife River’s contracting services are primarily provided to public-sector customers for the development and servicing of highways, local roads, bridges and other public-infrastructure projects.

Knife River has broad access to high-quality aggregates in most of its markets, which forms the foundation of its vertically integrated business model. The Company shares resources, including plants, equipment and people, across its various locations to maximize efficiency, and it transports its products by truck, rail and barge to complete the vertical value chain, depending on the particular market. Knife River’s strategically located aggregate sites, ready-mix plants and asphalt plants, along with its fleet of ready-mix and dump trucks, enable the Company to better serve its customers. Knife River believes its integrated and expansive business model is a strong competitive advantage that provides scale, efficiency and operational excellence for the benefit of customers, stockholders and the broader communities that it serves.

On May 31, 2023, the Separation of Knife River from MDU Resources was completed as a tax-free spin-off for U.S. federal income tax purposes. As a result of the Separation, MDU Resources distributed shares representing approximately 90 percent of Knife River’s outstanding common stock to holders of record of MDU Resources’ common stock as of the close of business on May 22, 2023. Following the Distribution, Knife River became an independent, publicly traded company.

Knife River operates through six operating segments: Pacific, Northwest, Mountain, North Central, South and Energy Services. These operating segments are used to determine the Company’s reportable segments and are based on the Company’s method of internal reporting and management of the business. There are five reportable segments, four of which are aligned by key geographic areas due to the production of construction materials and related contracting services and one of which is based on product line. The Company’s reportable segments are: Pacific, Northwest, Mountain, Central and Energy Services. Each geographic segment offers a vertically integrated suite of products and services, including aggregates, ready-mix concrete, asphalt, and contracting services, while the Energy Services segment, which has locations throughout the Company’s geographic footprint, produces and supplies liquid asphalt and related services, primarily for use in asphalt road construction, and is a supplier to some of the other segments.

In the fourth quarter of 2023, the Company completed a reorganization of its reporting structure, which has resulted in changes being made to the management of its business to best align with its strategies. As a result of the reorganization, the liquid asphalt and related services portion of the Pacific segment’s businesses are now reported under the Energy Services segment.

In addition, the North Central and South operating regions have been aggregated into one reportable segment, Central. All periods have been recast to conform with the revised presentation.

Additional details about each of the reportable segments as of and for the year ended December 31, 2023, is as follows:

__________________

*Does not include 6 sites that are classified as exploration stage properties.

Public-Sector Customers. The Company’s public-sector customers include federal, state and municipal governments for various projects, such as highways, bridges, airports, schools, public buildings and other public-infrastructure projects. Knife River believes public-sector funding is subject to fewer fluctuations in spending, as government funding tends to be less correlated with economic cycles and more reliant on approvals of government appropriation bills toward infrastructure initiatives. Specifically, the American Rescue Plan Act enacted in the first quarter of 2021 provides $1.9 trillion in COVID-19 relief funding for states, schools and local governments. States are moving forward with allocating these funds based on federal criteria and state needs, and in some cases, funding of infrastructure projects could positively impact Knife River. Additionally, the IIJA was enacted in the fourth quarter of 2021 and is providing long-term opportunities by designating $131 billion in funding across Knife River’s footprint. The Inflation Reduction Act, enacted in the third quarter of 2022, provides $1.8 trillion in funding, including domestic clean-energy renewal, generation and production. More than $5 billion in additional construction and infrastructure spending has been allocated to the specific end markets in which Knife River operates. Finally, the CHIPS Act, also enacted during the third quarter of 2022, provides $39 billion to bolster domestic semiconductor manufacturing capacity. The initial impacts of the CHIPS Act will be unknown for several years; however, Knife River is in a strong position to support this growth.

In addition to federal funding, 12 out of the 14 states in which Knife River operates have implemented new funding mechanisms for public projects, including projects related to highways, airports and other public infrastructure. Based on this recent wave of government funding and the current state of America’s infrastructure, which received a “C-” assessment from the American Society of Civil Engineers in 2021, Knife River believes there are strong public-market factors favorably affecting the outlook in this end market.

Private-Sector Customers. Knife River’s private-sector customers include both residential and nonresidential construction applications. Unlike public-sector customers, spending by private-sector customers is more dependent on both local and national economic cycles.

Knife River leverages its diverse geographic footprint to partially offset volatility originating from single local economies, and has the flexibility to reallocate resources from markets experiencing a downturn to markets that may be experiencing an economic upswing.

Residential construction typically includes single-family homes and multi-family units, such as apartments and condominiums. Demand for residential construction is influenced primarily by population growth, employment prospects and mortgage interest rates. While growth rates vary across the United States, overall residential construction demand decreased during 2023, due in part to higher interest rates and construction costs. According to the United States Census Bureau, residential construction in 2023 was $864.9 billion, which was 5.8 percent below 2022 amounts.

Alternatively, nonresidential construction includes all privately financed construction other than residential structures, such as data centers, warehouses, office buildings, factories, shopping malls, restaurants and other commercial structures. Nonresidential construction tends to lag residential activity and is mostly driven by population and economic growth trends and activity levels. According to the United States Census Bureau, nonresidential construction in 2023 was $676.0 billion, which was 21.9 percent above 2022 amounts. Residential and nonresidential private construction are not major sources of revenue for all of Knife River’s segments, but they are important markets for the materials side of the business. In addition to providing aggregates to these end markets, the majority of Knife River’s downstream ready-mix volumes go into private-sector projects.

Knife River is one of the largest aggregates-led construction materials and contracting services providers in the United States. The Company is recognized as a Top 10 aggregate producer and the fourth-largest sand and gravel producer in the country, per the United States Geological Survey. With its size and scale, Knife River operates a vertically integrated business model and serves its customers across the value chain, from raw materials to finished goods to contracting services. Knife River mines aggregates from its 1.1 billion tons of permitted aggregate reserves and processes them into various outputs, including ready-mix concrete and asphalt through its ready-mix and asphalt plants. Knife River then delivers products to its customers’ sites and offers contracting services downstream from the products it supplies.

Knife River believes its comprehensive and integrated platform provides several key benefits. First, its vertically integrated operating model provides efficiencies that lead to reduced costs and other benefits for customers. Second, Knife River has direct access to a supply of raw materials, such as aggregates, that are integrated into products that customers need, enabling Knife River to serve as a reliable source of such construction materials. Third, the Company has an internal fleet of approximately 2,100 haul trucks, as well as 12 barges and 272 owned railcars, to deliver its products to its customers in an efficient and timely manner. These varied transportation capabilities serve as a central part of Knife River’s value proposition.

Since Knife River’s move into construction materials and contracting services in 1992, it has strategically expanded to 14 states, with a focus on being a leading construction materials provider in mid-sized, high-growth markets, including Idaho, Texas, North Dakota and Washington, which are four of the seven fastest-growing states according to the most recent data from the United States Census Bureau.

In each of the segments where Knife River operates, its markets are supported by long-term economic drivers, which allow the Company to benefit from the population growth and economic build-out those drivers create. Knife River’s geographic diversity helps insulate it from temporary downturns in any one region’s economy and provides flexibility to shift resources to the areas where it is getting the best returns.

Knife River has a diverse customer base across both public and private sectors. On the public side, Knife River has extensive experience with federal, state and municipal government agencies, as well as other government customers. In the year ended December 31, 2023, nine of Knife River’s top 15 contracting services customers were state-level departments of transportation. Knife River has a good reputation with the departments of transportation and permitting agencies, and the Company is a trusted partner in collaborating with engineers and other public employees on performing work safely, on time and on budget. On the private side, Knife River provides its products and expertise to a broad spectrum of customers across industrial, commercial and residential developers and other private parties. Typically, this includes projects and customers such as large data centers, warehouses and general contractors specializing in commercial buildings and residential developments.

Knife River also provides construction materials and contracting services to customers with specialized needs. For example, the Company operates a prefabricated concrete construction business in its Northwest segment, which designs, manufactures and installs precast concrete products for public infrastructure, primarily bridges, and a broad range of commercial construction projects, including data centers, parking garages, schools, factories and arenas. In addition, Knife River has become a ready-mix concrete provider of choice for data centers because of its ability to meet certain exacting specifications. Further, the Company’s Energy Services segment provides high-performance modified liquid asphalt, as well as cationic and anionic asphalt emulsions, for use in paving projects. Each of these products and services requires highly trained experts to complete tasks with detailed specifications in a safe and controlled environment for its customers.

Knife River provides public-infrastructure solutions, such as highways, streets, bridges and airport runway projects. These public projects tend to remain steady over time, largely unaffected by economic cycles, and instead depend on government funding, which bolsters Knife River’s resiliency during recessionary periods. Knife River’s contracting services revenue for the year ended December 31, 2023, was 77 percent public and 23 percent private. In addition to their pre-existing funding mechanisms, 12 of the 14 states where Knife River operates have recently implemented new, enhanced or incremental funding sources for public projects, including the following:

•California. The Road Repair and Accountability Act (passed in 2017) invests $54 billion over 10 years in public infrastructure.

•Idaho. The Leading Idaho funding bill (passed in 2022) directs $400 million to road and bridge maintenance.

•Minnesota. The state of Minnesota passed a $2.6 billion infrastructure bill (passed in 2023), the largest in state history.

•Oregon. The Keep Oregon Moving transportation funding package (passed in 2017) raises $5.3 billion over 10 years.

•Texas. In 2023, Texas announced a $142 billion total investment in its infrastructure, including the passing of a 10-year, $100 billion statewide roadway construction plan.

•Washington. Move Ahead Washington (passed in 2022) provides $3 billion for public transportation over the next 16 years.

As of December 31, 2023, Knife River had backlog of $662.2 million with overall higher margins than previously experienced, all of which related to outstanding obligations for contracting services. The backlog at December 31, 2023, was comprised of 84 percent public and 16 percent private work. A majority of Knife River’s contracting services projects have an original contract duration of less than one year. Based on its track record, Knife River expects future revenues from infrastructure-related contracting services to be robust with higher overall margins.

Select examples of Knife River’s various projects in the public and private construction space include:

•Idaho Department of Transportation Infrastructure. Knife River is the contractor on the reconstruction of six significant highway interchange projects across that state of Idaho. All projects integrate Knife River materials and contracting services. Projects involve grading, aggregate, asphalt paving, bridge construction, ready-mix concrete and prestress components.

•Foothills Corridor. Knife River is the general contractor and materials provider for a project to upgrade two miles of roadway and add two lanes in Medford, Oregon, for the Oregon Department of Transportation. The project is expected to include 300,000 tons of aggregates and 50,000 tons of asphalt paving.

•Oregon Highway 99-I5 to McDonald. Knife River is reconstructing approximately four miles of roadway, including sidewalks, ramps, and curbing, in Tigard, Oregon for the Oregon Department of Transportation.

•Confidential Data Centers. Knife River is providing precast design, drafting, fabrication and installation of precast concrete wall panels at multiple data and fulfillment centers throughout the Northwest.

•Brazos MF 2818 Super Street. Knife River is reconstructing a heavily congested portion of roadway in Brazos County, Texas, which provides key access to several universities, an airport, and three large industrial parks. The “Super Street” design reduces congestion and increases safety by utilizing two-phase signals and eliminating left turns across oncoming traffic.

•Thurston County Highway 77. Knife River is reconstructing approximately 5.5 miles of roadway on US-77 from Walthill to Winnebago, Nebraska. The project is expected to include 28,500 tons of asphalt overlay, along with the construction of culverts, guardrails and shoulders.

Knife River continues to generate strong revenues, EBITDA, Adjusted EBITDA and Free Cash Flows that it has historically used for targeted organic growth opportunities, strategic acquisitions, capital expenditures and debt repayment. Knife River has flexibility to deploy capital toward its specific growth opportunities, capital expenditures, debt repayment and potential dividends, and in a downturn, Knife River has the flexibility to limit its capital spend to ensure responsible management of capital towards the existing business. For a discussion and reconciliation of EBITDA, Adjusted EBITDA and Free Cash Flows, see “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Non-GAAP Financial Measures.”

Core to its operating success, management takes a conservative approach with respect to the balance sheet, focusing on maintaining prudent levels of leverage and liquidity through the business cycle. When financing organic and inorganic growth opportunities, management considers the appropriate mix of debt and equity funding to protect the balance sheet from potential downturns in construction activity. The disciplined financial policy and conservative capital structure enables Knife River to continue to efficiently execute its growth strategy, even during challenging economic environments. Furthermore, management also shares responsibilities across key corporate functions with operations, thereby fostering close collaboration across teams and maintaining lower corporate overhead.

Knife River’s current geographic and asset footprint is the result of a deliberate acquisition growth strategy, which began in 1992 following Knife River’s first aggregate company acquisition. Since then, Knife River has completed over 80 acquisitions, built a vertically integrated business model starting from aggregates through contracting services, broadened its scope primarily into asphalt and ready-mix concrete products, and refined its value proposition through the offering of value-adding products and services such as cement, liquid asphalt and prestress concrete.

Knife River’s acquisition strategy has led to the refinement of a highly effective integration playbook, driving both organic and inorganic growth. EBITDA and Adjusted EBITDA have been driven by strong organic growth and margin expansion, supported by contributions from acquisitions. As Knife River continues to grow through acquisitions, it is able to continue achieving greater scale and synergies. Its centralized and scalable technology platform allows for integration of new companies into its efficient, vertically integrated internal processing network for fleet management, scaling, batching, financial, and operational reporting programs and other software. Knife River is actively pursuing additional acquisition opportunities, with a focus on adding high-quality materials to reserves, improving vertical integration advantage and extending geographic reach.

Knife River is focused on increasing its market share and improving margins by acquiring businesses in high-margin markets that are centered on specialized products. For example, Knife River expanded its prestressed concrete product line by an acquisition completed in Spokane Valley in 2020. Due to the complexity and expertise required in prestress concrete production, this product line averages higher margins than those of aggregates and ready-mix concrete. Through this acquisition, Knife River effectively doubled the size of its prestress operations, improved its ability to meet tighter schedules, gained access to new territories and attained synergy opportunities to further boost margins.

In recent years, Knife River has expanded its presence in both the Northwest and North Central regions, specifically in Oregon and South Dakota, each of which includes rapidly growing markets with strong construction demand. In 2021, Knife River acquired three companies based in Oregon, including Baker Rock Resources, an aggregate and asphalt supplier, and Oregon Mainline Paving, a portable asphalt paving company. These acquisitions added approximately 80 million tons of aggregate reserves to Knife River’s Northwest region, as well as two stationary asphalt plants, two portable asphalt plants and 212 employees. In 2018, Knife River acquired Sweetman Const. Co. in Sioux Falls, South Dakota, adding 55 million tons of aggregate reserves to the North Central region, along with seven ready-mix plants, three asphalt plants and 260 employees.

Knife River’s senior management team has extensive experience, with an average of 22 years in the industry spanning several business cycles. The management team’s strategic decision to acquire and develop into a vertically integrated construction materials and contracting services business has been valuable in winning new customers and maintaining longstanding customer relationships. Furthermore, the team’s decision to enter select geographies has proven to be important to the sustained growth of the business over several decades.

Knife River’s business strategy of maximizing its vertical integration, leveraging its core values to be the supplier of choice in all its markets and continued growth is underpinned by several key initiatives, including:

Competitive EDGE Strategy. In 2023, Knife River introduced Competitive EDGE, a framework for long-term shareholder value creation. This strategy seeks to add value by focusing on four key strategic areas:

a.EBITDA margin improvement. Through a combination of commercial growth and operational excellence initiatives focused on pricing strategy, cost control measures and divestitures of underperforming assets as necessary, the Company plans to drive sustained EBITDA margin expansion.

b.Discipline. A strong balance sheet and disciplined allocation of capital supports margin growth and industry-leading return on invested capital.

c.Growth. Knife River aims to strengthen its market position through organic and inorganic growth opportunities, with an emphasis on aggregate-based operations.

d.Excellence. Knife River aims to be best in class in all aspects of its business, providing ongoing, high-quality training at every level of the Company.

Life at Knife. Knife River is committed to its employees, customers and communities by operating with integrity and always striving for excellence. To achieve this, Knife River continues to implement its “Life at Knife” philosophy, which is expressed in four core values:

a.People. Knife River is a people-first company that believes investing in training supports skill development, employee retention and long-term business continuity. Knife River takes care of its team by providing them the tools, training and time to perform their work safely and successfully, by providing competitive wages and benefits, and by providing a safe and respectful work environment. The Company’s “One Team: Stronger Together” initiative provides training and awareness for employees that Knife River embraces the diverse backgrounds and viewpoints of its team members in an effort to keep learning from one another so the Company can keep improving.

b.Safety. Knife River is committed to employees’ health and safety, and a culture that values, respects and supports each employee. Safety is a core value to Knife River on every task, every time, every day. Knife River strives to achieve world-class safety standards because it genuinely cares about the well-being of its employees and recognizes the bottom-line benefits of being a safe company. The Company focuses on the three T’s of safety: Tools, Training and Time. Knife River provides employees with the tools and training to safely and successfully perform their jobs, and expects that employees take the time to do their jobs safely.

c.Quality. Knife River is committed to strong corporate governance, producing high-quality products and services, and being a good neighbor in its communities. Knife River delivers consistent, high-quality products and services to its customers and is committed to quality in all it does. Knife River stands behind its work and embraces innovation to enhance quality of its products and services.

d.Environment. Knife River always aims to operate efficiently to meet the needs of the present without compromising the ability of future generations to meet its needs. Knife River continuously manages its impact on the environment to minimize its footprint and keep the communities in which it operates beautiful for future generations.

Recruitment, development and retention of talented employees. While labor shortages are a trend across the industry, Knife River has taken significant steps to showcase construction as a career of choice. For example, in each of its segments, the Company conducts employment outreach to many groups, including historically underrepresented populations, and provides training for employees to earn their commercial driver’s license.

Furthermore, to help attract new workers to the construction industry and enhance the skills of its current employees, Knife River owns and operates a state-of-the-art training facility on a 230-acre tract of property in the Pacific Northwest, featuring an 80,000 square-foot heated indoor arena for training on trucks and heavy equipment and an attached 16,000 square-foot classroom and conference room facility. The Knife River Training Center offers hands-on training for construction-related careers, including heavy-equipment operators and truck drivers, in addition to safety and leadership training. The training center is used corporate-wide to enhance the skills of current employees as well as to recruit and teach skills to new employees through both classroom education and hands-on experience. It also is used by Knife River’s customers and industry peers, who send employees to the training center to take courses on heavy equipment, truck driving, leadership development, facilitator training and safety training. The facility plays a critical role in the Company’s workforce remaining sustainable and contributes to showcasing construction as a career of choice. Knife River’s outreach efforts to market the training center have included interfacing with historically underrepresented groups, and the Company has partnered with the National Association of Minority Contractors to provide scholarships for training to qualifying employees of minority-owned businesses. Knife River believes the talent nurtured through the training programs will surpass that of industry peers as it relates to safety, operating efficiency and new technology.

Sustainability. Knife River believes its focus on sustainability creates value for the communities it serves, for Knife River itself and for its stockholders. Sustainable practices, whether focused on environmental practices, business innovations, recruiting and retaining personnel, or other key factors, provide an opportunity for Knife River to focus on its long-term success and the success of the communities where it operates. Knife River’s sustainability efforts create opportunities to increase revenue and profitability, create a competitive advantage, and attract a skilled and diverse workforce.

As a result, sustainable development of Knife River and its communities is at the core of Knife River’s decision-making process and corporate vision. For additional information regarding the progress the Company has made towards its sustainability efforts, refer to the Company’s 2023 Sustainability Report, which is expected to be published to the Company’s website in the first quarter of 2024, and is not incorporated by reference herein.

Environment. In 2023, Knife River established a sustainability committee comprised of executive and senior management across the Company. Every year, Knife River assesses its capital investment needs to further mitigate environmental impacts, particularly in regard to meeting or exceeding permit requirements and environmental regulations. Investments have ranged from equipment that captures emissions, to a company specializing in the production of carbon-dioxide sequestering synthetic aggregates used in ready-mix concrete, to more environmentally friendly, warm mix asphalt that provides a higher quality product while reducing emissions. In each of its segments, Knife River incorporates recycled asphalt, recycled concrete and recycled water into various products. In California and Oregon, the Company uses renewable diesel fuel in its on-road and off-road fleet vehicles, reducing GHG emissions. Additionally, Knife River’s usage of rail to haul aggregates in certain markets reduces over-the-road truck deliveries by several thousand trucks each year.

Knife River is evaluating corporate-wide carbon emission intensity goals. Starting in 2022, Knife River began tracking its Scope 1 and Scope 2 carbon emissions as a first step in establishing its corporate-wide baseline of emissions allowing the Company to evaluate future carbon emission intensity goals. This process will include analyzing the data, identifying opportunities for improvement in our carbon emissions intensity and considering future carbon emission intensity goals. Knife River will continue to actively pursue various opportunities in the clean energy infrastructure build-out in both construction materials and contracting services.

Long-term, strategic aggregate reserve position. Knife River supplies its customers with a large volume of aggregates. To offset normal asset base depletion, Knife River continuously explores new opportunities to replenish its assets in existing and new geographies. Due to the scarcity of aggregate reserves and difficulty associated with permitting new reserves, Knife River approaches this process methodically early on in its asset lifecycle, leveraging its expertise and technology to find replacement sources in desired locations. The selection process involves thorough vetting and examination to ensure high-potential sites are selected for mining.

Knife River owns 114 aggregate-production sites, of which 109 are active sites, as of December 31, 2023. It also operates through another 72 leased sites, of which 71 are active as of December 31, 2023, with some offering the option to renew at the end of the lease term. Knife River also acquires new mines in strategic locations to service new areas and regional hubs with growing construction activity and Knife River intends to continue to explore new mine acquisition opportunities to strengthen its asset base.

Enhanced value through vertical integration and strategic acquisitions. Vertical integration provides Knife River direct control over the production process, inventory planning, optimization of supply chain and delivery to end customers, thereby providing efficiencies that result in higher value and other benefits for customers, including greater reliability of supply.

Furthermore, Knife River’s exposure to both public and private-sector customers across its vertical value chain provides better end market diversification and makes Knife River more resilient to economic downturns. When exploring new acquisition opportunities, one of the elements Knife River focuses on is the additive margin potential to the overall business. Knife River carefully evaluates potential operating synergies following integration into its existing businesses and is also strategic about acquiring specialized materials and services businesses to improve its margin profile.

Supply chain. Knife River’s access to internal aggregate sources, processing plants and fleet delivery network, some with rail-to-road transloading capabilities, allows it to provide reliable, timely and efficient service to its end customers, further enhancing the value Knife River brings during complex contracting services projects.

Knife River’s ready-mix concrete product line relies on cement as a key ingredient in its formulation. Typically, Knife River sources its cement from a diverse mix of suppliers and has focused on developing strong relationships with individual cement suppliers, which has led to better service and availability. In addition, Knife River operates strategically located cement storage facilities that are serviced by rail, barge or ship to help stabilize the supply of cement.

Similarly, Knife River’s asphalt product line relies on liquid asphalt as a key component of its asphalt mix. The company typically sources liquid asphalt from a diverse mix of suppliers, including from its Energy Services segment, and has good relationships with those providers, helping to ensure availability.

The United States construction materials industry is highly fragmented. Industry participants typically range from small, private companies focused on a single material, product or area to large, publicly traded corporations that provide a broad suite of materials and services. Companies compete on a variety of factors, including price, service, quality, delivery time and proximity to the customer. However, limitations on the distance that materials can be transported efficiently results in primarily local or regional operations. Accordingly, the number and size of competitors varies by geography and product lines.

The United States construction materials industry serves a diverse customer base that includes federal, state and municipal governmental agencies, commercial and residential developers and private parties. The mix of customers varies by region and economic conditions.

The main factors and trends in the United States construction materials and related contracting services industry include:

•Key economic factors. Many factors affect product demand, including public spending on roads and infrastructure projects, general economic conditions, including population growth and employment levels, and prevailing interest rates.

•Location and transportation. Construction materials are expensive to transport due to their weight ratios, so they are generally produced and delivered locally or regionally. Access to well-positioned reserves is critical.

•Vertical integration. Market participants that operate a vertically integrated business model can access certain efficiencies that lead to reduced product costs and other benefits for customers, including greater reliability of supply.

•Industry fragmentation. There are thousands of construction materials producers of varying scope and size. Market participants may enter new geographies or expand existing positions through the acquisition of existing facilities.

•Seasonality. Activity in certain areas is seasonal due to the effects of weather. Most of the production and sales of materials and related services in the northern United States occurs between May and October, in line with end market activity.

•Cyclicality. The demand for construction materials products and contracting services is significantly influenced by the cyclical nature of the economy.

•Regulations. Environmental and zoning approvals are often required for the development and expansion of facilities.

•Production inputs. Cost and availability of energy, labor and other inputs can vary over time based on macroeconomic factors and impact profitability of operations.

Knife River participates in the following primary markets: aggregates, ready-mix concrete, asphalt, liquid asphalt and contracting services.

Aggregates, consisting of crushed stone and sand and gravel, are a natural, granular material engineered to various sizes, grades and chemical compositions primarily for construction applications. Aggregates also are a major material component in the production of ready-mix concrete and asphalt. Aggregate sources can be found in relatively uniform sediments in certain regions of each state throughout the United States.

Generally extracted through open pits at the surface of a site, aggregates are typically produced by blasting hard rock from quarries and then crushing and screening it to various sizes according to customer needs.

The United States aggregates industry is highly fragmented, with many participants operating primarily in local and regional areas. In 2023, the United States Geological Survey reported that throughout the United States a total of 1,400 companies operated 3,500 quarries and 180 sales/distribution yards producing crushed stone and 3,400 companies operated 6,500 pits and 200 sales/distribution yards producing construction sand and gravel. This fragmentation is a result of high transportation costs that typically limit supply areas of producers.

Ready-mix concrete, a mixture principally comprised of cement, aggregates and water, is measured in cubic yards and specifically batched or produced for customers’ projects and then transported and poured on site. It also can be poured at a manufacturing facility to produce prefabricated building solutions, such as wall panels, concrete roofing systems, parking garages and stadium components. According to the National Ready Mixed Concrete Association, concrete is the most widely used material in the construction sector today.

Due to the relative speed at which ready-mix concrete sets, supply is generally localized and delivered within close proximity to the production site, with an estimated 7,000-plus ready-mix concrete batching plants in the United States and Canada according to the National Ready Mixed Concrete Association. There has been a steady increase (4 percent compound annual growth rate) in shipments since the industry cycle low of 257 million cubic yards in 2010. In 2022, the National Ready Mixed Concrete Association estimated shipments of 404 million cubic yards of ready-mix concrete, which is 12 percent below the industry peak of 458 million cubic yards in 2005.

Asphalt is a combination of approximately 95 percent aggregates bound together by approximately 5 percent liquid asphalt. Asphalt is typically used in new road construction as well as road maintenance and repair, covering approximately 94 percent of the 3 million miles of paved roads in the United States, according to the National Asphalt Pavement Association. Given the significant proportion of aggregates in asphalt, local aggregate producers often participate in the asphalt business to ensure an output for the producer’s aggregates.

Like ready-mix concrete, asphalt sets rapidly, limiting delivery to within close proximity to the production facility. In 2021, there were approximately 3,600 asphalt production sites in the United States that produced an estimated 432 million tons of asphalt, a 15 percent increase compared to the approximately 375 million tons produced five years prior. The asphalt paving industry also has a record of using economically and environmentally sustainable practices. Asphalt pavement material is highly recyclable, predominantly through reclaimed asphalt pavement. In 2023, Knife River used approximately 800,000 tons of recycled asphalt pavement in its asphalt production. Additionally, the use of warm-mix asphalt allows producers to reduce temperatures during the mixing process, lowering energy use and carbon emissions. In 2023, Knife River produced approximately 700,000 tons of warm-mix asphalt.

Liquid asphalt (sometimes referred to as asphalt cement or asphalt oil) is the binding agent used in combination with aggregates to produce asphalt mix for road construction, streets, parking lots, driveways and more. Knife River’s Energy Services segment supplies liquid asphalt to both internal and third-party customers, which helps support the Company’s vertically integrated business model. The segment has terminals in five states, where it stores and manufactures value-added liquid asphalt, polymer modified asphalt and emulsions to meet the requirements of end users.

Knife River vertically integrates its construction materials with contracting services such as aggregate laydown, asphalt paving, concrete construction, site development and bridges. Demand in the contracting services industry is influenced by the cyclical nature of the construction industry and correlates with the demand for construction materials.

The contracting services portion of Knife River’s business is heavily weighted toward public markets, which provide more stability throughout the economic cycles. The contracting services industry is typically less capital-intensive than construction materials and has relatively fewer barriers to entry. Price is an important competitive factor in the award of service agreements. However, customers often consider several other factors in selecting a service provider, such as technical expertise and experience, safety ratings, geographic presence, financial and operational resources and industry reputation around dependability.

Knife River’s core product lines include: aggregates, ready-mix concrete, asphalt and liquid asphalt. The Company also performs related contracting services.

For the year ended December 31, 2023, Knife River’s revenue and gross profit by products and services were as follows:

Knife River supplies high-quality aggregates through its 1.1 billion tons of permitted aggregate reserves, which are sourced from its aggregate sites across 11 states. The Company focuses primarily on supplying markets with strong local demand, and in most cases serves customers close to its strategically located aggregate sites. In 2023, Knife River sold 33.6 million tons of aggregates, with 30.7 million being produced from aggregate mining properties.

Knife River mines crushed stone and sand and gravel at its aggregate sites that are utilized in general construction and are a major component in its production of ready-mix concrete and asphalt paving products. Leveraging its vertically integrated platform, 37 percent of its aggregates revenue was derived from internal sales in 2023. For more information about the aggregate sites, see “Item 2. Properties.”

Knife River produces ready-mix concrete through its 102 ready-mix plants situated across 13 states. Knife River’s vertically integrated portfolio of assets allows the Company to provide most of the aggregates it uses in the production of ready-mix concrete. Due to the time-sensitive nature of delivering ready-mix concrete, the Company focuses on supplying customers near its facilities. In 2023, Knife River sold 3.8 million cubic yards of ready-mix concrete.

Incremental to the hauling capabilities across products and services, ready-mix concrete plants are complemented by the Company’s fleet of ready-mix trucks and drivers who safely deliver heavy materials on time. Knife River is an industry leader in safe and efficient delivery of ready-mix concrete and has pioneered what has become the industry-standard training program for ready-mix delivery professionals. Knife River continues to update the program with a focus on safety for drivers and the public. This training developed by Knife River is made available through the National Ready Mixed Concrete Association to its members.

The following table sets forth details applicable to Knife River’s ready-mix concrete plants and related fleet as of December 31, 2023:

Knife River produces and delivers asphalt from 56 plants across 10 states, most often utilizing the Company’s own aggregates in the production process. Of the 56 plants, 22 are portable plants that support large asphalt paving projects on roadways, airports and commercial sites. Similar to ready-mix concrete, asphalt sets rapidly, limiting delivery to within close proximity to the production facility. In 2023, Knife River sold 6.8 million tons of asphalt.

The following table sets forth details applicable to Knife River’s non-portable and portable asphalt plants as of December 31, 2023:

Knife River distributes liquid asphalt through its Energy Services sites and has the capacity to service neighboring states through storage facilities capable of storing approximately 275,000 tons of liquid asphalt across multiple states. Knife River has five liquid-asphalt terminal sites and six used-oil collection points.

Although not common to all locations, Knife River provides various other products and services, depending on customer needs. These include, but are not limited to, retail sales of cement in Alaska and Hawaii and petroleum recovery services in the Energy Services segment.

Cement is a key ingredient in the production of ready-mix concrete. Knife River’s core supply of cement is sourced from a diverse range of suppliers. Knife River has strategically located cement storage facilities in Alaska and Hawaii that can hold approximately 60,000 tons and 90,000 tons of cement, respectively. Knife River has six additional distribution centers with storage and barging capabilities across the islands of Hawaii.

Knife River’s contracting services include responsibilities as general contractor and subcontractor, aggregate laydown, asphalt paving, concrete construction, site development and bridges, and in some segments the manufacturing of prestressed concrete products. Vertical integration allows Knife River to have direct internal access to critical raw materials, resulting in competitive advantages from better control of product inventory.

In 2023, most of Knife River’s contracting services were related to “horizontal” construction, such as streets and highways, airports and bridges for customers in the public sector. In the private sector, Knife River’s contracting services projects were within the residential, commercial and industrial markets.

The following table sets forth revenue details applicable to Knife River’s contracting services for the year ended December 31, 2023:

Results are affected by seasonal fluctuations, with the second and third quarters historically being the quarters with the highest activity. Knife River’s ability to provide contracting services in the states in which it operates depends on the weather. In states with colder winter weather, Knife River’s contracting services are primarily performed from May through October, compared to most of the year in states with largely consistent warmer weather.

Knife River’s customers can be segmented into public and private-sector customers, with public-sector customers contributing about 77 percent of the Company’s revenues from contracting services. The public side includes federal, state and municipal governmental agencies with contracting services projects related to highways, streets and other public infrastructure. Mandates from governmental agencies largely depend on federal, state and municipal budgets allocated to expansion and improvement of national infrastructure. The private side includes a broad spectrum of customers across industrial, commercial and residential developers and other private parties. The mix of sales by customer class varies year to year depending on the variability in type of work.

Knife River’s top 15 customers accounted for about 20 percent of its 2023 revenue, of which nine were state-level departments of transportation. The Company is not dependent on any single customer or group of customers for sales of its products and services, where the loss of which would have a material adverse effect on its business. No individual customer accounted for more than 10 percent of its 2023 revenue.

Knife River operates in a largely fragmented industry, including large, public companies and many small, privately held companies. Smaller, independent operators make up the majority of Knife River’s competition; however, it also faces competition in some markets from large, publicly traded United States aggregates producers, including Cemex S.A.B. de C.V., CRH plc, Eagle Materials, Inc., Granite Construction, Inc., Heidelberg Materials, Holcim, Martin Marietta Materials, Inc., Summit Materials, Inc. and Vulcan Materials Company. The nature of Knife River’s competition varies among its products and geographies due to the generally local and regional nature of supply.

Knife River believes it has a competitive advantage in aggregates through its high-quality, strategically located reserves and assets, and its internal fleet of trucks, rail and barge. Knife River’s vertical integration and local knowledge enable it to maintain a strong understanding of the needs of its customers. In addition, Knife River has a strong commitment to environmental stewardship, which assists it in obtaining new permits and new reserves.

Knife River believes its employees are its most valuable resource and are critical to the success of the Company. Significant resources are employed to attract, develop and retain extraordinary and diverse talent and fully promote each employee’s capabilities. The Company’s focus on diversity, inclusion, talent development, talent acquisition and succession planning has provided for a deep bench of talented employees. Employees in managerial or supervisory positions have an average tenure of 16 years with Knife River, which demonstrates our workforce’s pride in and dedication to the Company. Knife River believes it has good relationships with its employees, including its unionized workforce.

As of December 31, 2023, Knife River employed 4,389 people, all of whom were employed in the United States. The total number of hourly personnel at any given time is subject to the volume of projects in progress and fluctuates on a seasonal basis. At the peak of the 2023 construction season, Knife River employed over 5,700 people. The table below provides additional details on the employee demographics as of December 31, 2023.

Knife River’s union employees are represented by 39 collective-bargaining agreements, of which six of the agreements are currently in negotiations. The majority of the collective-bargaining agreements contain provisions that prohibit work stoppages or strikes and provide dispute resolution through binding arbitration in the event of an extended disagreement. The Company maintains good working relationships with labor unions and does not anticipate any significant issues with any unions in 2024.

Knife River’s compensation programs are designed to align the compensation of our employees with our financial performance and the employees’ individual performance, to provide proper incentives to attract, retain and motivate employees to achieve the best possible results. The structure of compensation programs balances guaranteed base pay with incentive compensation opportunities. In addition, full-time employees are eligible for health insurance, physical, mental and financial wellness programs, paid and unpaid leave, retirement plans, life insurance, disability and accident coverage, and more. The Company also offers a variety of voluntary benefits to allow employees to select the best options to meet their needs.

Knife River embraces the diversity of its employees, customers and stakeholders, including their unique backgrounds, experiences, thoughts and talents. The Company is committed to an inclusive environment that respects the differences and embraces the strengths of its diverse employees, and it maintains policies, programs and initiatives that are consistent with this commitment.

To be the employer of choice for the broadest pool of talent and skill, Knife River is committed to equal employment opportunity and affirmative action and is dedicated to the achievement of equality and opportunity for all employees and applicants for employment. Knife River strives to meet or exceed all EEO and affirmative action laws, directives and legislation. The Company’s EEO/Affirmative Action Policy ensures employees are not discriminated against.

Knife River is committed to the development and training of its employees and has taken significant steps to showcase construction as a career of choice. Knife River operates a world-class training facility to enhance the skills of current employees corporate-wide and to recruit and teach skills to new employees through both classroom education and hands on experience.

Knife River prioritizes providing opportunities for advancement through job mobility, succession planning and promotions. The Company operates under a philosophy to promote from within and offer advancement opportunities at all levels of employment, which helps retain talented employees. The Company engages in talent and succession planning processes and reviews succession plans with senior leaders at least annually, focusing on high-performing and high-potential talent, diverse talent, and succession for critical roles.

For additional information related to employee demographics, Knife River’s diversity, equity and inclusion efforts and other information, refer to the Company’s 2023 Sustainability Report, which is expected to be published to the Company’s website in the first quarter of 2024, and is not incorporated by reference herein.

Knife River is committed to the safety and well-being of its employees, contractors, customers, and the residents of the communities where it operates. The Company’s safety program utilizes the three T’s: Tools, Training and Time, as a structure for Knife River to provide its employees with the proper tools and training to safely and successfully perform their jobs and asks that employees take the time to use those tools and training to do their jobs safely.

Safety is a core value at Knife River and is foundational to establishing a culture of safety excellence in the workplace. The Company is committed to safety and health and promotes this through a variety of means, including continual training and education programs for its employees.

Knife River adheres to seven key principles regarding safety:

•All injuries can be prevented;

•Working safely is a condition of employment for all employees;

•Management must demonstrate leadership in preventing injuries by providing a safe work environment, adequate resources, performance incentives and appropriate follow-up on any unsafe conditions or actions;

•All employees are responsible for preventing injuries to themselves and others;

•All operating exposures can be safeguarded or controlled;

•Training employees to work safely is essential; and

•Preventing personal injuries and property damage is good business.

Knife River has a goal of zero workplace injuries. The Company has developed its safety culture, programs and training as appropriate for the construction materials and contracting services industries, and the types of operations it performs. The Company continuously evolves its programs to incorporate best practices, innovations in personal protective equipment and changes to safety and health laws. Knife River continually outperforms its industry comparison group by achieving a three-year average recordable injury rate that is 17 percent lower and a lost time accident rate that is 47 percent lower over the last three years.

Knife River’s pledge to operate in an environmentally responsible manner is reviewed and encouraged through several measures, including oversight by professional environmental staff with reporting and accountability to regional operations leaders, regular review of environmental and sustainability disclosures by the executive Sustainability Committee, thorough audits of operating activities and thorough property reviews during due diligence on potential acquisitions.

Knife River is subject to complex federal, state and local environmental compliance and reclamation regulations. These federal, state and local laws and regulations include, among others: the federal Clean Air Act and the federal Clean Water Act; the Resource Conservation and Recovery Act; the federal Mine Safety and Health Administration; the federal Occupational Safety and Health Administration; the federal CERCLA; the federal EPA; and, occasionally, the Endangered Species Act.

These laws and regulations impose numerous obligations and limitations on our operations, including:

•Zoning and land use requirements to obtain a permit or other approval before conducting regulated activities;

•Restriction on the types, quantities and concentration of materials that can be released into the environment (including noise and discharges to air and water);

•Restrictions on the management of hazardous wastes and underground storage tank systems, as well as obligations to clean up or remediate spills of hazardous materials into the environment;

•Limitation or prohibition of activities on certain lands lying within wilderness, wetlands or other protected areas;

•Obligations to restore or reclaim former mining areas;

•Requirements to comply with specific health and safety criteria addressing worker protection; and

•The imposition of substantial liabilities for pollution resulting from the Company’s operations.

Knife River’s operations are also subject to California emission reductions and regulatory compliance. The California Air Resources Board has implemented several regulations around air quality standards, including reporting requirements. These regulations are based on source categories, several of which impact Knife River. The three categories having the most impact to Knife River’s California operations are: off-road diesel particulate and oxides of nitrogen; on-road diesel particulate and oxides of nitrogen; and harbor craft diesel particulate and oxides of nitrogen. In addition, beginning in 2026 Knife River will be required to publicly report on 2025 scope 1 and scope 2 GHG emissions, and beginning in 2027 will be required to report on 2026 scope 3 GHG emissions. Noncompliance with these laws and regulations can subject Knife River to fines, loss of licenses or registrations or various forms of civil or criminal prosecution, any of which could have a material adverse effect on Knife River’s reputation, business, financial position, results of operations and cash flows.

In addition, certain environmental laws, such as CERCLA and EPA, impose strict requirements for companies to pay to remediate and restore sites where hazardous substances, hydrocarbons or solid wastes have been disposed, stored or released. Knife River may be required to remediate contaminated properties currently or formerly owned or operated by the Company or materials disposed of by the Company, regardless of whether such contamination resulted from actions taken by the Company or from the conduct of others at the time those actions were taken. In addition, in connection with certain acquisitions, the Company could assume, or be required to provide indemnification against, environmental liabilities that could expose it to material losses. Furthermore, the existence of contamination at properties owned, leased or operated by the Company could result in increased operation costs or restrictions on the Company’s ability to use those properties as intended, including for mining purposes. One such site is the Portland, Oregon, Harbor Superfund Site where Knife River - Northwest was named as a PRP by the EPA related to a commercial property site acquired in 1999. For further information related to environmental reclamation obligations, see Item 8. Note 18.

Knife River also is subject to comprehensive environmental permit requirements, which are usually associated with new mining operations, although requirements vary widely from state to state and even within states. In some areas, land use regulations and associated permitting requirements are minimal. However, some states and local jurisdictions have very demanding requirements for permitting new mines. Environmental impact reports are sometimes required before a mining permit application can be considered for approval. These reports can take several years to complete. The report can include projected impacts of the proposed project on air and water quality, wildlife, noise levels, traffic, scenic vistas and other environmental factors. The reports generally include suggested actions to mitigate the projected adverse impacts. Nonetheless, Knife River has been successful in obtaining mining and other land-use permits that provide for sufficient permitted reserves to support its operations. Individual permits applicable to Knife River’s various operations are managed and tracked as they relate to the statuses of the application, modification, renewal, compliance and reporting procedures.

Knife River regularly monitors and reviews its operations, procedures and policies for compliance with its operating permits and related laws and regulations. The Company has incurred, and may incur in the future, significant operating and capital expenditures to comply with environmental laws and regulations. During 2023, Knife River incurred $4.5 million related to compliance with current environmental laws and regulations. In addition, Knife River anticipates spending $4.7 million for capital expenditures related to compliance with current environmental laws and regulations in 2024 and has not developed a budget for 2025 and 2026. These amounts do not include expenditures related to what may be ultimately determined with regard to the issues described previously for the Portland, Oregon, Harbor Superfund Site. Additionally, the Company has recorded asset retirement liabilities on its balance sheet related to the reclamation obligations for its mining activities. As the Company acquires new operations, it works closely with local authorities to ensure compliance with all applicable laws and regulations.

Knife River believes it is in compliance with all applicable environmental laws and regulations and that any existing non-compliance is not likely to have a material adverse effect on the Company’s results of operations. However, there can be no assurance that future compliance costs or liabilities associated with such laws and regulations or activities will not be significant.

The Company files annual, quarterly and current reports, proxy statements and other information with the SEC. The Company’s SEC filings are available to the public over the internet at the SEC’s website at https://www.sec.gov and on the Company’s website free of charge at https://www.kniferiver.com as soon as reasonably practicable after they are filed with or furnished to the SEC.

The Company maintains a website at https://www.kniferiver.com. The website and the information contained on or connected to that site are not incorporated into this Annual Report.

The Company is subject to competition throughout the markets it serves as they are highly fragmented and competes with a number of regional, national and international companies. These companies may have greater financial and other resources than Knife River, while other competitors are smaller and more specialized, and concentrate their resources in particular areas of expertise. The Company’s results are also affected by the number of competitors in a market, the production capacity that a particular market can accommodate, the pricing practices of other competitors and the entry of new competitors in a market. Significant competition could lead to lower prices, higher wages, lower sales volumes and higher costs.

In addition, construction materials and related contracting services are marketed under highly competitive conditions and are subject to competitive forces such as price, quality, service, delivery time and proximity to the customer. Knife River’s customers make competitive determinations based upon qualifications, experience, performance, reputation, technology, customer relationships, price, quality and ability to provide the relevant services in a timely, safe and cost-efficient manner. Increased competition may result in the inability to win bids for future projects and failure to effectively compete could negatively affect Knife River’s results of operations, financial position and cash flows.

Furthermore, new acquisition opportunities are subject to competitive bidding environments, which may increase the prices the Company must pay to successfully grow its business through acquisitions.

Knife River must obtain governmental, environmental, mining, and/or other permits at many of its facilities. New quarry sites can take years to develop and in a number of states in which Knife River operates, it can be difficult to permit new aggregate sites or expand existing aggregate sites due to community resistance and regulatory requirements, among other things. In addition, construction aggregates are difficult to transport efficiently and freight costs can make certain deposits uneconomical to mine if located in areas of little growth or without the ability to supply growing markets served by rail or barge. Failure to secure, permit and mine such reserves could negatively impact Knife River’s business, financial condition and results of operations.

Knife River’s customers include public and private entities that have been, and may continue to be, negatively impacted by the economy. A recessionary construction economy can increase the likelihood that Knife River will not be able to collect on all accounts receivable or may experience a delay in payment from some customers. If its customers or counterparties experience financial difficulties, which has occurred and may reoccur, Knife River could experience difficulty in collecting receivables. While no one customer accounted for over 10 percent of Knife River’s revenue in 2023 or 2022, Knife River faces collection risk as a normal part of business where it performs services and subsequently bills clients for such services. In the event that Knife River has concentrated credit risk from customers in a specific geographic area or industry, negative trends or a worsening in financial conditions in that specific geographic area or industry, Knife River could become more susceptible to disproportionately high levels of default.

Nonpayment and/or nonperformance by its customers and counterparties could have a negative impact on Knife River’s results of operations and cash flows.

The Company’s current geographic and asset footprint is the result of a deliberate acquisition growth strategy, which began in 1992 following its first aggregate company acquisition. Since then, Knife River has acquired and integrated over 80 complementary businesses, which have contributed significantly to its growth. Management continues to evaluate strategic acquisition opportunities as part of its ongoing growth strategy. Management is unable to predict the timing or size of any future acquisitions. Potential risks associated with acquisitions could include, among other things: Knife River’s ability to identify attractive acquisitions; Knife River’s ability to offer potential acquisition targets competitive transaction terms; Knife River’s ability to raise additional equity and/or incur additional indebtedness, which could increase its net leverage; and reputational or other damage due to the prior conduct of an acquired company.

In addition, the investigation of potential acquisitions and the negotiation, drafting and execution of relevant agreements, disclosure documents and other instruments require substantial management time and attention and costs for third-party consultants. If a proposed acquisition is not completed for any reason, including events beyond the Company’s control, the costs incurred up to that point for the transaction likely would not be recoverable.

Acquisitions typically require integration of the acquired company’s project management, finance, information technology, risk management, purchasing, human resources and fleet management functions. The Company may be unable to successfully integrate an acquired business into its existing business, and an acquired business may not be as profitable as expected or at all. Acquisitions involve risks that the acquired business will not perform as expected and that the expectations concerning the value, strengths and weaknesses of the acquired business will prove incorrect. The inability to successfully integrate new businesses in a timely and orderly manner could increase costs and result in dis-synergies and negatively impact the Company’s results of operations and prevent Knife River from realizing expected rates of return on the acquired business. Factors affecting the successful integration of an acquired business include, but are not limited to, the following:

•Responsibility for certain liabilities of an acquired business, whether or not known, which could include, among other things, tax liabilities, product and other tort liabilities, breach of contract claims, environmental liabilities, permitting and regulatory compliance issues and liabilities for employment practices.

•Ability to retain local managers, key employees and customers who are important to the operations of the acquired business.

•Implementation of financial and management information systems, business practices and policies.

•Conforming standards, controls, procedures and policies, business cultures and compensation structures among Knife River and the acquired company.

•Pursuit of multiple acquisition opportunities simultaneously.

•Unforeseen expenses, complications and delays, including difficulties in employing sufficient staff and maintaining operational and management oversight.

In addition, potential acquisitions may be in states in which the Company does not currently operate, which could result in unforeseen operating difficulties and difficulties in coordinating geographically dispersed operations, personnel and facilities.

Knife River cannot guarantee that it will continue to acquire businesses at valuations consistent with prior acquisitions or that it will complete future acquisitions at all. The Company also cannot know whether there will be attractive acquisition opportunities at reasonable prices or that financing will be available.

Knife River uses technology in substantially all aspects of its business operations and requires uninterrupted operation of information technology and operation technology systems, including disaster recovery and backup systems and network infrastructure. While Knife River has policies, procedures and processes in place designed to strengthen and protect these systems, they may be vulnerable to physical and cybersecurity failures or unauthorized access, due to: hacking, human error, theft, sabotage, malicious software, ransomware, third-party compromise, acts of terrorism, acts of war, acts of nature or other causes.

Although there are manual processes in place, should a compromise or system failure occur, interdependencies to technology may disrupt Knife River’s ability to fulfill critical business functions. This may include interruption of facilities for delivery of construction materials or other products and services, any of which could adversely affect its reputation, business, cash flows and results of operations or subject Knife River to legal costs.

Knife River’s accounting systems and its ability to collect information and invoice customers for products and services could be disrupted. If Knife River’s operations are disrupted, it could result in decreased revenues and remediation costs that could adversely affect Knife River’s results of operations and cash flows.

Knife River, through the ordinary course of business, requires access to sensitive customer, supplier, employee, financial and other data. While Knife River has implemented extensive security measures, including limiting the amount of sensitive information retained, a breach of its systems could compromise sensitive data and could go unnoticed for some time. Such an event could result in negative publicity and reputational harm, remediation costs, legal claims and fines that could have an adverse effect on its financial results. Third-party service providers that perform critical business functions for Knife River or have access to sensitive information within Knife River also may be vulnerable to security breaches and information technology risks that could adversely affect the Company.

Cyberattacks continue to increase in frequency and sophistication, which could cause Knife River’s information systems to be a target of ongoing and sophisticated cyberattacks by a variety of sources with the apparent aim to breach its cyber-defenses. Also, Knife River may face increased cyber risk due to the increased use of employee-owned devices and work from home arrangements. Such incidents could have a material adverse effect on its business, financial condition or results of operations. Management is continuously reevaluating the need to upgrade and/or replace systems and network infrastructure. These upgrades and/or replacements could adversely impact operations by imposing substantial capital expenditures, creating delays or outages, or creating difficulties transitioning to new systems. System disruptions, if not anticipated and appropriately mitigated, could adversely affect the Company.

The SEC has adopted new rules that require Knife River to provide greater disclosures around cybersecurity risk management, strategy and governance, as well as to disclose the occurrence of material cybersecurity incidents. Knife River cannot predict or estimate the amount of additional costs it will incur in order to comply with these rules or the timing of such costs. These rules and regulations may also require Knife River to report a cybersecurity incident before it has been able to fully assess the impact or remediate the underlying issue. Efforts to comply with such reporting requirements could divert management’s attention from its incident response and could potentially reveal system vulnerabilities to threat actors. Failure to timely report incidents under these or other similar rules could also result in monetary fines, sanctions, or subject Knife River to other forms of liability. This regulatory environment is increasingly challenging and may present material obligations and risks to Knife River’s business, including significantly expanded compliance burdens, costs and enforcement risks.

The Company has not incorporated artificial intelligence within its operations but does have technology partners that have incorporated artificial intelligence into their systems. The potential use of artificial intelligence could introduce security risks that could expose confidential data leading to the loss of competitive and reputational damage. The implementation of artificial intelligence could also impose a reliability risk of the Company’s data not being fully vetted for accuracy.

While Knife River’s insurance policies include liability coverage for certain of these matters, if it experiences a significant security incident, it could be subject to liability or other damages that exceed its insurance coverage and it cannot be certain that such insurance policies will continue to be available to it on economically reasonable terms, or at all, or that any insurer will not deny coverage as to any future claim.

The successful assertion of one or more large claims against Knife River that exceed available insurance coverage, or the occurrence of changes in our insurance policies, including premium increases or the imposition of large deductible or co-insurance requirements, could have a material adverse effect on its results of operations, financial condition and cash flows.

Issues in the development and use of artificial intelligence, combined with an uncertain regulatory environment, may result in reputational harm, liability or other adverse consequences to the Company’s business operations. Knife River may adopt and integrate generative artificial intelligence tools into its systems for specific use cases reviewed by legal and information security. Knife River’s vendors may incorporate generative artificial intelligence tools into their offerings without disclosing this use to the Company, and the providers of these generative artificial intelligence tools may not meet existing or rapidly evolving regulatory or industry standards with respect to privacy and data protection and may inhibit Knife River’s or its vendors’ ability to maintain an adequate level of service and experience. If Knife River, its vendors, or its third-party partners experience an actual or perceived breach of privacy or security incident because of the use of generative artificial intelligence, the Company may lose valuable intellectual property and confidential information and its reputation and the public perception of the effectiveness of its security measures could be harmed. Further, bad actors around the world use increasingly sophisticated methods, including the use of artificial intelligence, to engage in illegal activities involving the theft and misuse of personal information, confidential information and intellectual property. Any of these outcomes could damage Knife River’s reputation, result in the loss of valuable property and information, and adversely impact its business.

Knife River is in the process of transitioning information technology infrastructure and systems to support its critical business functions, including accounting and reporting, in order to replace many of the systems and functions that MDU Resources has traditionally provided. Knife River may experience temporary interruptions in business operations if it cannot transition effectively to its own stand-alone systems and functions, which could disrupt its business operations and have a material adverse effect on profitability. In addition, Knife River’s costs for the operation of these systems may be higher than the amounts reflected in the audited consolidated financial statements.

The Company’s efforts to protect its intellectual property rights may not be sufficient or effective to prevent misappropriation or infringement of its intellectual property, which could result in a loss of its competitive advantage. In addition, any of its intellectual property rights may be challenged, which could result in being declared invalid or unenforceable. Knife River may litigate to protect its intellectual property from misappropriation or infringement by others, which could be expensive and cause a diversion of resources and ultimately may not be successful.

Moreover, competitors or other third parties may allege that Knife River, or consultants or other third parties retained or indemnified by it, infringe on its intellectual property rights. The potential risks and uncertainties of intellectual property-related litigation and an assertion of an infringement claim against Knife River may cause it to spend significant amounts to defend the claim, and possibly pay significant money damages. In the event of a settlement or adverse judgment, Knife River’s results of operations may materially decline if it is prohibited from using the relevant intellectual property, especially if it is required to pay to the alleged owner of the relevant intellectual property licensing fees, royalties or damages. Even in instances where Knife River believes that claims and allegations of intellectual property infringement against it are without merit, defending against such claims may be time consuming and expensive and may result in the diversion of time and attention of its management and employees.

A majority of Knife River’s business is seasonal, with results of operations affected by weather conditions. Construction materials production and related contracting services typically follow the activity in the construction industry, with heavier contracting services workloads in the spring, summer and fall. Extreme or unusually adverse weather conditions, which have occurred and may reoccur, such as extreme temperatures, heavy or sustained rainfall or snowfall, wildfires and storms may affect the demand for products and the ability to perform services on construction work. The Company could also be impacted by drought conditions, which may restrict the availability of water supplies and inhibit the ability to conduct operations. As a result, extreme or unusually adverse weather conditions could negatively affect the Company’s results of operations, financial position and cash flows.

Knife River’s operations are exposed to fluctuations in prices for labor, energy-related products, cement, fuel, raw materials and utilities, among other things. Prices are generally subject to change in response to fluctuations in supply and demand and other general economic and market conditions beyond Knife River’s control. The global political environment is a primary driver in price changes to commodities and inputs out of the Company’s control. In recent years, the Company experienced elevated commodity and supply chain costs including the costs of labor, raw materials, energy-related products and other inputs used in the production and distribution of its products and services. Recent inflationary pressures have significantly increased the cost of raw materials by greater than 10 percent in comparison to average annual historical increases of approximately 3 percent. While Knife River seeks to mitigate some or all cost increases through increases in selling prices of its materials, maintaining positive relationships with numerous raw material suppliers, escalation clauses in construction services contracts and fuel surcharges, the Company may not always be successful which could negatively impact its results of operations.

High energy prices, specifically for diesel fuel, natural gas and liquid asphalt, have impacted and could further affect the margins realized, as well as demand for construction materials and related contracting services. Increased labor costs, due to labor shortages, competition from other industries, or other factors, could also negatively affect Knife River’s results of operations. Due to their size and weight, aggregates are costly and difficult to transport efficiently. Knife River’s products and services are generally localized around its aggregate sites and served by truck or in certain markets by rail or barge. Knife River could be negatively impacted by freight costs due to rising fuel costs; rate increases for third-party freight; truck, railcar or barge shortages, including shortages of truck drivers and rail crews; rail service interruptions; and minimum tonnage requirements, among other things. To the extent price increases or other mitigating factors are not sufficient to offset these increased costs adequately or timely, and/or if the price increases result in a significant decrease in sales volumes, Knife River’s results of operations, financial position and cash flows could be negatively impacted.

At times or in certain markets, Knife River relies on third-party vendors and manufacturers to supply or transport many of the materials necessary for its operations. Disruptions, shortages or delays in the transportation of materials; price increases from suppliers or manufacturers; or inability to source needed materials have occurred and may continue to occur, which could adversely affect Knife River’s results of operations, financial condition, cash flows and harm customer relationships. Further, supply chain disruptions can occur from events out of Knife River’s control such as fires, floods, severe weather, natural disasters, environmental incidents or other catastrophes. National and regional demand for cement and liquid asphalt may at times outpace the supply in the market. This imbalance creates a temporary shortage which may cause prices to increase faster than downstream products. Any material disruption at Knife River’s facilities or those of its customers or suppliers or otherwise within its supply chain, whether as a result of downtime, work stoppages or facility damage, could prevent Knife River from meeting customer demands or expected timelines, require it to incur unplanned capital expenditures, or cause other material disruptions to its operations, any of which could have a material adverse effect on Knife River’s operations, financial position and cash flows.

Certain of Knife River’s businesses depend on government spending for infrastructure and other similar building activities. As a result, demand for some of Knife River’s products is influenced by local, state and federal government fiscal policies, tax incentives and other subsidies, and other general macroeconomic and political factors. Projects in which Knife River participates may be funded directly by governments or privately funded, but are otherwise tied to or impacted by government policies and spending measures.

Government spending is often approved only on a short-term basis and some of the projects in which Knife River’s products are used require longer-term funding commitments. If government funding is not approved or funding is lowered as a result of poor economic conditions, lower than expected revenues, competing spending priorities, or other factors, it could limit infrastructure projects available, increase competition for projects, result in excess inventory, and decrease sales, all of which could adversely affect the profitability of Knife River’s business.

Additionally, certain regions or states may require or possess the means to finance only a limited number of large infrastructure projects and periods of high demand may be followed by years of little to no activity. There can be no assurances that governments will sustain or increase current infrastructure spending and tax incentive and other subsidy levels, and any reductions thereto or delays therein could affect Knife River’s business, liquidity and financial condition, and results of operations.

Unfavorable economic conditions can negatively affect the level of public and private expenditures on projects and the timing of these projects which, in turn, can negatively affect demand for Knife River’s products and services. The level of demand for construction materials and contracting services could be adversely impacted by the economic conditions in the industries and market areas Knife River serves, as well as in the general economy. Local, state and federal budget limitations also affect the funding available for infrastructure spending, which could have an adverse impact on Knife River’s earnings and results of operations.

Pandemics have disrupted national, state and local economies. To the extent a pandemic adversely impacts Knife River’s businesses, operations, revenues, liquidity or cash flows, it could also have a heightened effect on other risks described in this section. The degree to which a pandemic will impact Knife River depends on future developments, including the resurgence of COVID-19 and its variants, federal and state mandates, actions taken by governmental authorities, effectiveness of vaccines being administered, and the pace and extent to which the economy recovers and remains under relatively normal operating conditions.

Other factors associated with a pandemic that could impact Knife River’s businesses and future operating results, revenues and liquidity include impacts related to the health, safety, and availability of employees and contractors; extended rise in unemployment; public and private-sector budget changes and constraints; counterparty credit; costs and availability of supplies; capital construction and infrastructure operation and maintenance programs; financing plans; pension valuations; travel restrictions; and legal matters. The economic and market disruptions resulting from a pandemic could also lead to greater than normal uncertainty with respect to the realization of estimated amounts, including estimates for backlog, revenue recognition, intangible assets, other investments and provisions for credit losses.

Knife River is and/or may become party to, among other things, personal injury, environmental, commercial, contract, warranty, antitrust, tax, property entitlements and land use, product liability, health and safety, and employment claims.

The outcome of pending or future lawsuits, claims, investigations or proceedings is often difficult to predict and could be adverse and material in amount. In addition to the monetary cost, litigation can divert management’s attention from its core business opportunities. Development of new information in these matters can often lead to changes in management’s estimated liabilities associated with these proceedings including the judge’s rulings or judgements, jury verdicts, settlements or changes in applicable law. The outcome of such matters is often difficult to predict, and unfavorable outcomes could have a material impact to Knife River’s results of operations, financial position and cash flows.

Knife River operates in or provides services to capital-intensive industries in which federal trade policies could significantly impact the availability and cost of materials. Imposed and proposed tariffs could significantly increase the prices and delivery lead times on raw materials and finished products that are critical to Knife River and its customers, such as cement and steel, among other things. Knife River faces competition from manufacturers both in the United States and around the world, some of which may engage in competition and trade practices involving the importation of competing products in the United States or other foreign laws, regulations or practices. Prolonged lead times on the delivery of raw materials and further tariff increases on raw materials and finished products could adversely affect Knife River’s business, financial condition and results of operations.

Knife River is subject to environmental laws and regulations affecting many aspects of its operations, including air and water quality, wastewater discharge, the generation, transportation and disposal of solid waste and hazardous substances, aggregate permitting and other environmental considerations. These laws and regulations can increase capital, operating and other costs; cause delays as a result of litigation and administrative proceedings; and create environmental compliance, remediation, containment, monitoring and reporting obligations for construction materials facilities. Environmental laws and regulations can also require the Company to install pollution control equipment at its facilities, clean up spills and other contamination, and correct environmental hazards, including payment of all or part of the cost to remediate sites where Knife River’s past activities, or the activities of other parties, caused environmental contamination. These laws and regulations generally require Knife River to obtain and comply with a variety of environmental licenses, permits, inspections and other approvals. Although the Company strives to comply with all applicable environmental laws and regulations, public and private entities and private individuals may interpret Knife River’s legal or regulatory requirements differently and seek injunctive relief or other remedies against Knife River. The Company cannot predict the outcome, financial or operational, of any such litigation or administrative proceedings.

Existing environmental laws and regulations may be revised and new laws and regulations seeking to protect the environment may be adopted or become applicable to Knife River. These laws and regulations could require the Company to limit the use or output of certain facilities; restrict the use of certain fuels; prohibit or restrict new or existing services; replace certain fuels with renewable fuels; retire and replace certain facilities and equipment; install pollution controls; remediate environmental impacts; remove or reduce environmental hazards; or forego or limit the development of resources. Revised or new laws and regulations that increase compliance and disclosure costs and/or restrict operations could adversely affect Knife River’s results of operations and cash flows.

Severe weather events, such as tornadoes, hurricanes, rain, drought, ice and snowstorms, and high- and low- temperature extremes, occur in regions in which Knife River operates and maintains infrastructure. Climate change could change the frequency and severity of these weather events, which may create physical and financial risks. Such risks could have an adverse effect on Knife River’s financial condition, results of operations and cash flows. Increases in severe weather conditions or extreme temperatures may cause infrastructure construction projects to be delayed or canceled and limit resources available for such projects resulting in decreased revenue or increased project costs. In addition, drought conditions could restrict the availability of water supplies or limit the ability to obtain water use permits, inhibiting the ability to conduct operations. To date, the Company has not experienced any material impacts to its financial condition, results of operations or cash flows due to the physical effects of climate change.

Climate change may impact a region’s economic health, which could impact its revenues. Knife River’s financial performance is tied to the health of the regional economies served where it provides construction materials and services. Increases in severe weather events or significant changes in temperature and precipitation patterns could adversely affect the economies of the states and communities affected by that industry.

The insurance industry may also be adversely affected by severe weather events, which may impact availability of insurance coverage, insurance premiums and insurance policy terms.

The price of energy also has an impact on the economic health of communities. The cost of additional regulatory requirements related to climate change, such as regulation of carbon dioxide emissions under the federal Clean Air Act, requirements to replace fossil fuels with renewable energy or to obtain emissions credits, or other environmental regulation or taxes could impact the availability of goods and the prices charged by suppliers, which would normally be borne by consumers through higher prices for energy and purchased goods, and could adversely impact economic conditions of areas served by Knife River. To the extent financial markets view climate change and emissions of GHG as a financial risk, this could negatively affect Knife River’s ability to access capital markets or result in less competitive terms and conditions.

Public concern over climate change has resulted in, and may continue to result in, new or increased regional, federal and global legal and regulatory requirements, including taxation, to reduce or mitigate carbon emissions and to limit or impose additional costs on carbon and water usage or other climate-related objectives. In the event that such regulation is more stringent than current regulatory obligations, or the measures that Knife River is currently undertaking to monitor and improve its resource efficiency, the Company may experience disruptions in, or increases in its costs of, operation and delivery to comply with new regulatory requirements due to investments in facilities and equipment or the relocation of its facilities. If Knife River or its suppliers are required to comply with these laws and regulations, or if Knife River chooses to take additional voluntary steps to reduce or mitigate its impact on the climate, Knife River may experience increased costs for energy, production, transportation, and raw materials, increased capital expenditures, or increased insurance premiums and deductibles, each of which could adversely impact its operations. In particular, proposed, new or inconsistent regulation and taxation of fuel and energy could increase the cost of complying with such laws and regulations as well as the cost of operation, including fuel required to operate its facilities or transport and distribute its products, thereby increasing the distribution and supply chain costs associated with Knife River’s products. Any assessment of the potential impact of future climate change legislation, regulations or industry standards, as well as any international treaties and accords, is uncertain given the wide scope of potential regulatory change in the jurisdictions in which Knife River operates.

Beyond the commercial pressures implicated by climate change concerns, Knife River’s operations may face potential adverse physical effects. In August of 2023 Hawaii experienced a series of wildfires across the island of Maui which impacted the Company’s operations, however, not materially. If any of Knife River’s properties and facilities experience a significant operational disruption or catastrophic loss due to the increased frequency or the severity of natural disasters or severe weather events, it could delay or disrupt production, shipments, and revenue, and result in potentially significant expenses to repair or replace these properties, which may negatively affect Knife River’s business and financial results.

Knife River could face stakeholder scrutiny related to ESG. There has been an increased focus from stakeholders and regulators related to ESG matters across all industries in recent years, with investors (including institutional investors), proxy advisory firms, customers, employees and lenders, placing increasing importance on the impacts and social cost associated with climate change as well as ESG practices and policies of companies, including sustainability performance and risk mitigation efforts. There is also risk that the Company could be perceived as, or accused of, “greenwashing,” i.e., the process of conveying misleading information or making false claims that overstate potential ESG benefits, which could lead to reputational harm.

Investors (including institutional investors), proxy advisory firms, customers, employees and lenders, may also require the Company to implement sustainability/ESG responsibility procedures or standards before they continue to do business with Knife River. In addition, some investors use ESG criteria to guide their investment strategies, and may not invest in Knife River, or divest their holdings of Knife River, if they believe the Company’s policies relating to ESG matters are inadequate or, on the other hand, have a negative response to such policies as a result of anti-ESG sentiment. Concern that GHG emissions contribute to global climate change has led to international, federal, state and local legislative and regulatory proposals to reduce or mitigate the effects of GHG emissions. Knife River monitors, analyzes and reports GHG emissions from its operations as required by applicable laws and regulations. Knife River will continue to monitor GHG regulations and their potential impact on operations.

Due to the uncertain availability of technologies to control GHG emissions and the unknown obligations that potential GHG emission legislation or regulations may create, Knife River cannot determine the potential financial impact on its operations.

In addition, the increasing focus on climate change and stricter regulatory requirements may result in the Company facing adverse reputational risks associated with certain of its operations producing GHG emissions. Although Knife River has not experienced difficulties in these areas, if it is unable to satisfy the increasing climate-related expectations of certain stakeholders, Knife River may suffer reputational harm, which may cause its stock price to decrease or difficulty in accessing the capital or insurance markets. Such efforts, if successfully directed at Knife River, could increase the costs of or access to capital or insurance and interfere with business operations and ability to make capital expenditures.

Changes to federal, state and local tax laws have the ability to benefit or adversely affect Knife River’s earnings and customer costs. Significant changes to corporate tax rates could result in the impairment of deferred tax assets that are established based on existing law at the time of deferral. A number of factors may increase Knife River’s future effective income tax rate, including; governmental authorities increasing taxes or eliminating deductions, particularly the depletion deduction, the mix of earnings from depletable versus non-depletable businesses, the jurisdictions in which earnings and/or revenues are taxed, the resolution of issues arising from tax audits with various tax authorities, changes in the valuation of our deferred tax assets and liabilities, adjustments to estimated taxes upon finalization of various tax returns, changes in available tax credits, changes in stock-based compensation, other changes in tax laws and the interpretation of tax laws and/or administrative practices.

Knife River must attract, develop and retain executive officers and other professional, technical and labor forces with the skills and experience necessary to successfully manage, operate and grow. Competition for these employees is high, due in part to changing workforce demographics, a shortage of younger employees who are qualified to replace employees as they retire, and remote work opportunities, among other things. In some cases, competition for these employees is on a regional or national basis. At times of low unemployment, it can be difficult for Knife River to attract and retain qualified and affordable personnel. A shortage in the supply of skilled personnel creates competitive hiring markets, increased labor expenses, decreased productivity and potentially lost business opportunities to support its operating and growth strategies. Additionally, if Knife River is unable to hire employees with the requisite skills, it may be forced to incur significant training expenses. As a result, Knife River’s ability to maintain productivity, relationships with customers, competitive costs, and quality services is limited by the ability to employ, retain and train the necessary skilled personnel and could negatively affect its results of operations, financial position and cash flows.

It is also critical to develop and train employees, hire new qualified personnel, and successfully manage the short and long-term transfer of critical knowledge and skills, including leadership development and succession planning throughout Knife River.

While there are processes in place for management transition and the transfer of knowledge and skills, the loss of key personnel, coupled with an inability to adequately train other personnel, hire new personnel or transfer knowledge and skills, could significantly impact the Company’s ability to perform under our contracts and execute on new or growing programs.

Additionally, approximately 13 percent of Knife River’s workforce is comprised of employees that are covered by collective bargaining agreements with various unions. If the Company encounters difficulties with renegotiations or renewals of collective bargaining arrangements or are unsuccessful in those efforts, Knife River could incur additional costs and experience work stoppages. Union actions at suppliers also can affect Knife River. Any delays or work stoppages could adversely affect the ability to perform under contracts, which could negatively impact the Company’s results of operations, cash flows and financial condition.

Knife River is primarily self-insured for the health care benefits for eligible employees. Increasing quantities of large individual health care claims and an overall increase in total health care claims as health care costs continue to increase could have an adverse impact on operating results, financial position and liquidity, particularly if Knife River cannot continue to carry stop loss insurance. Legislation related to health care could also change Knife River’s benefit program and costs.

Knife River estimates aggregate reserves and resources based on available data. The estimates depend upon the interpretation of surface and subsurface investigations, major assumptions and other supporting data, which can be unpredictable. The quantity must be considered only an estimate until reserves are actually extracted and processed. This uncertainty in aggregate resource and reserve calculation may adversely impact Knife River’s results of operations.

Backlog consists of the uncompleted portion of services to be performed under job-specific contracts. Contracts are subject to delay, default or cancellation, and contracts in the Company’s backlog are subject to changes in the scope of services to be provided, as well as adjustments to the costs relating to the applicable contracts. Backlog may also be affected by project delays or cancellations resulting from weather conditions, external market factors and economic factors beyond Knife River’s control, among other things. Accordingly, there is no assurance that backlog will be realized. The timing of contract awards and duration of large new contracts can significantly affect backlog. Backlog at any given point in time may not accurately represent the revenue or margin that is realized in any period. Also, the backlog as of the end of the year may not be indicative of the revenue and gross margin expected to be earned in the following year and should not be relied upon as a stand-alone indicator of future financial results of Knife River.

Knife River’s operations require significant capital investment to purchase and maintain the property and equipment required to mine and produce its products. In addition, Knife River’s operations include a significant level of fixed and semi-fixed costs. Consequently, Knife River relies on capital markets, particularly in the first half of the year due to the seasonal nature of the industry, as sources of liquidity for capital requirements not satisfied by cash flows from operations. If Knife River is not able to access capital at competitive rates, the ability to implement business plans, make capital expenditures or pursue acquisitions it would otherwise rely on for future growth may be adversely affected. Market disruptions may increase the cost of borrowing or adversely affect Knife River’s ability to access one or more financial markets. Higher interest rates on borrowings have impacted and could further impact Knife River’s results of operations. Such market disruptions could include: a significant economic downturn; financial distress of unrelated industry leaders in the same line of business; deterioration in capital market conditions; turmoil in the financial services industry; volatility in commodity prices; pandemics, including COVID-19; terrorist attacks; acts of war; and cyberattacks.

The debt capital market environment could impact Knife River’s ability to borrow money in the future. Additional financing or refinancing might not be available and, if available, may not be at economically favorable terms. Further, an increase in Knife River’s leverage could lead to deterioration in its credit ratings. A downgrade in Knife River’s credit ratings, regardless of the cause, could also limit the ability to obtain additional financing and/or increase the cost of obtaining financing. There is no guarantee Knife River will be able to access the capital markets at financially economical interest rates, which could negatively affect Knife River’s business. Knife River is also exposed to interest rate volatility risk on its variable rate debt as changes in central bank federal policies, as well as macro-economic factors, impact interest rates. While Knife River believes it will continue to have adequate credit available to meet its needs, there can be no assurance of that.

Knife River may be required to obtain financing in order to fund certain strategic acquisitions, if they arise, or to refinance outstanding debt. It is possible a large strategic acquisition would require Knife River to issue new equity and other debt and could result in a ratings downgrade notwithstanding Knife River’s issuance of equity securities to fund the transaction. Knife River is also exposed to risks from tightening credit markets, through the interest payable on any variable-rate debt, including the interest cost on future borrowings under Knife River’s credit facilities. While Knife River believes it will continue to have adequate credit available to meet its needs, there can be no assurance of that.

Knife River has defined benefit pension plans for some of its current and former employees. Assumptions regarding future costs, returns on investments, interest rates and other actuarial assumptions have a significant impact on the funding requirements and expense recorded relating to these plans.

Adverse changes in economic indicators, such as consumer spending, inflation data, interest rate changes, political developments and threats of terrorism, among other things, can create volatility in the financial markets. These changes could impact the assumptions and negatively affect the value of assets held in Knife River’s pension plans and may increase the amount and accelerate the timing of required funding contributions for those plans.

Knife River participates in MEPPs for employees represented by certain unions. Knife River is required to make contributions to these plans in amounts established under numerous collective bargaining agreements between the operating subsidiaries and those unions.

Knife River may be obligated to increase its contributions to underfunded plans that are classified as being in endangered, seriously endangered or critical status as defined by the Pension Protection Act of 2006. Plans classified as being in one of these statuses are required to adopt Rehabilitation Plans or Funding Improvement Plans to improve their funded status through increased contributions, reduced benefits or a combination of the two.

Knife River may also be required to increase its contributions to MEPPs if the other participating employers in such plans withdraw from the plans and are not able to contribute amounts sufficient to fund the unfunded liabilities associated with their participation in the plans. The amount and timing of any increase in its required contributions to MEPPs may depend upon one or more factors, including the outcome of collective bargaining; actions taken by trustees who manage the plans; actions taken by the plans’ other participating employers; the industry for which contributions are made; future determinations that additional plans reach endangered, seriously endangered or critical status; newly enacted government laws or regulations and the actual return on assets held in the plans; among others. Knife River could experience increased operating expenses as a result of required contributions to MEPPs, which could have an adverse effect on its results of operations, financial position or cash flows.

In addition, pursuant to the Employee Retirement Income Security Act of 1974, as amended by the Multiemployer Pension Plan Amendments Act, the Company could incur a partial or complete withdrawal liability upon withdrawing from a plan, exiting a market in which it does business with a union workforce or upon termination of a plan.

Knife River could also incur additional withdrawal liability if its withdrawal from a plan is determined by that plan to be part of a mass withdrawal.

Knife River had $697.0 million in aggregate principal amount of indebtedness outstanding as of December 31, 2023. Such indebtedness consists of Knife River’s $425 million 7.750% notes due 2031, $272 million in aggregate principal amount of term loans and a $350 million revolving credit facility, under which Knife River has no aggregate principal amount of loans outstanding as of December 31, 2023.

This amount of debt could potentially have important consequences to Knife River and its investors, including:

•Requiring a substantial portion of its cash flow from operations to make interest payments on this debt following the Separation.

•Making it more difficult to satisfy debt service and other obligations.

•Increasing the risk of a future credit ratings downgrade of its debt, which could increase future debt costs and limit the future availability of debt financing.

•Increasing its vulnerability to general adverse economic and industry conditions.

•Reducing the cash flow available to fund capital expenditures and other corporate purposes and to grow its business.

•Limiting its flexibility in planning for, or reacting to, changes in its business and the industry.

•Placing it at a competitive disadvantage relative to its competitors that may not be as highly leveraged with debt.

•And limiting its ability to borrow additional funds as needed or take advantage of business opportunities as they arise, pay cash dividends or repurchase ordinary shares.

To the extent that Knife River incurs additional indebtedness, the foregoing risks could increase. In addition, Knife River’s actual cash requirements in the future may be greater than expected and its cash flow from operations may not be sufficient to repay all of the outstanding debt as it becomes due. Further, Knife River may not be able to borrow money, sell assets or otherwise raise funds on acceptable terms, or at all, to refinance its debt.

The rating, outlook or watch assigned to Knife River or its debt could be lowered or withdrawn entirely by a rating agency if, in that rating agency’s judgment, current or future circumstances relating to the basis of the rating, outlook, or watch such as adverse changes to Knife River’s business, so warrant. Knife River’s credit ratings may also change as a result of the differing methodologies or changes in the methodologies used by the rating agencies. Any future lowering of Knife River’s or its debt’s ratings, outlook or watch likely would make it more difficult or more expensive for Knife River to obtain additional debt financing.

The historical information included in this Annual Report refers to Knife River’s business (i) as operated by and integrated with MDU Resources for periods prior to the Separation and (ii) as a stand-alone company for the period after the Separation. The historical financial information included in this Annual Report is derived from the audited consolidated financial statements and accounting records of MDU Resources and Knife River.

Accordingly, the historical financial information included in this Annual Report does not necessarily reflect the financial condition, results of operations and cash flows that Knife River would have achieved as a separate, publicly traded company during the periods presented prior to the Separation or those that Knife River will achieve in the future, primarily as a result of the factors described below:

•Prior to the Separation, Knife River’s business was operated by MDU Resources as part of its broader corporate organization, rather than as an independent company, and MDU Resources or one of its affiliates performed certain corporate functions for Knife River. Knife River’s historical results reflect allocations of corporate expenses from MDU Resources for such functions prior to the Separation, which are likely to be less than the expenses Knife River would have incurred had it operated as a separate publicly traded company.

•Prior to the Separation, the Company shared economies of scope and scale in costs, employees and vendor relationships. Although Knife River entered into a transition services agreement with MDU Resources following the Separation, these arrangements may not retain or fully capture the benefits that Knife River had enjoyed as a result of being integrated with MDU Resources and may result in paying higher charges than in the past for these services. This could have a material adverse effect on the Company’s business, financial position, results of operations and cash flows as a stand-alone company.

•Generally, Knife River’s working capital requirements and capital for its general corporate purposes, including acquisitions and capital expenditures, had, prior to the Separation, been satisfied as part of the corporate-wide cash management policies of Centennial. Following the Separation, Knife River’s results of operations and cash flows are now likely to be more volatile, and Knife River may need to obtain additional financing from banks, through public offerings or private placements of debt or equity securities, strategic relationships or other arrangements, which may or may not be available and may be more costly.

•The cost of capital for Knife River’s business as a stand-alone company may be higher than MDU Resources’ cost of capital prior to the Separation.

•As a public company, Knife River is subject to the reporting requirements of the Exchange Act, the Sarbanes-Oxley Act and the Dodd-Frank Act and is required to prepare its financial statements according to the rules and regulations required by the SEC. Complying with these requirements has resulted in significant costs and could require the Company to divert substantial resources, including management time, from other activities.

Other significant changes have occurred in the Company’s cost structure, management, financing and business operations as a result of operating as a company separate from MDU Resources. For additional information about the past financial performance of Knife River’s business and the basis of presentation of the historical audited consolidated financial statements, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Item 8 - Financial Statements and Supplementary Data.”

In connection with the Separation, MDU Resources received a private letter ruling from the IRS and one or more opinion(s) of its tax advisors, regarding certain U.S. federal income tax matters relating to the Separation and the Distribution. The IRS private letter ruling was based upon and relied on, and the opinion(s) of tax advisors was based upon and relied on, among other things, various facts and assumptions, as well as certain representations, statements and undertakings of MDU Resources and Knife River, including those relating to the past and future conduct of MDU Resources and Knife River. If any of these representations, statements or undertakings is, or becomes, inaccurate or incomplete, or if MDU Resources or Knife River breach any of the representations or covenants contained in any of the Separation-related agreements and documents or in any documents relating to the IRS private letter ruling and/or the opinion(s) of tax advisors, the IRS private letter ruling and/or the opinion(s) of tax advisors may be invalid and the conclusions reached therein could be jeopardized.

Notwithstanding receipt by MDU Resources of the IRS private letter ruling and the opinion(s) of tax advisors, the IRS could determine that the Separation and/or certain related transactions should be treated as taxable transactions for U.S. federal income tax purposes if it determines that any of the representations, assumptions, or undertakings upon which the IRS private letter ruling or the opinion(s) of tax advisors were based are false or have been violated. In addition, the IRS private letter ruling does not address and the opinion(s) of tax advisors do not address all of the issues that are relevant to determining whether the Separation, together with certain related transactions, qualifies as a transaction that is generally tax-free for U.S. federal income tax purposes. Further, the opinion(s) of tax advisors represent the judgment of such tax advisors and are not binding on the IRS or any court, and the IRS or a court may disagree with the conclusions in the opinion(s) of tax advisors. Accordingly, notwithstanding receipt by MDU Resources of the IRS private letter ruling and the opinion(s) of tax advisors, there can be no assurance that the IRS will not assert that the Separation and/or certain related transactions do not qualify for tax-free treatment for U.S. federal income tax purposes or that a court would not sustain such a challenge. In the event the IRS were to prevail in such challenge, MDU Resources, Knife River and MDU Resources stockholders could be subject to significant U.S. federal income tax liability.

If the Separation, together with related transactions, were to fail to qualify as a transaction that is generally tax-free for U.S. federal income tax purposes under Sections 355 and 368(a)(1)(D) of the Internal Revenue Code, in general, for U.S. federal income tax purposes, MDU Resources would recognize taxable gain as if it had sold Knife River common stock in a taxable sale for its fair market value, and MDU Resources stockholders who receive such Knife River shares in the distribution would be subject to tax as if they had received a taxable distribution equal to the fair market value of such shares. ”

Under the tax matters agreement, the Company may be required to indemnify MDU Resources against any additional taxes and related amounts resulting from the Separation (and any related costs and other damages) to the extent such amounts resulted from (a) an acquisition of all or a portion of its equity securities or assets, whether by merger or otherwise (and regardless of whether Knife River participated in or otherwise facilitated the acquisition), (b) other actions or failures to act by Knife River or (c) any inaccuracy or breach of the Company’s representations, covenants or undertakings contained in any of the Separation-related agreements and documents or in any documents relating to the IRS private letter ruling and/or the opinion(s) of tax advisors. Any such indemnity obligations could be material.

Under current law, a separation can be rendered taxable to the parent corporation and its stockholders as a result of certain post-separation acquisitions of shares or assets of the spun-off corporation. For example, a separation may result in taxable gain to the parent corporation under Section 355(e) of the Internal Revenue Code if the Separation were deemed to be part of a plan (or series of related transactions) pursuant to which one or more persons acquire, directly or indirectly, shares representing a 50 percent or greater interest (by vote or value) in the spun-off corporation.

To preserve the U.S. federal income tax treatment of the Separation, and in addition to the Company’s indemnity obligation described below, the tax matters agreement restricts Knife River, for the two-year period following the distribution, except in specific circumstances, from:

•Entering into any transaction pursuant to which all or a portion of Knife River common stock or assets would be acquired, whether by merger or otherwise.

•Issuing equity securities beyond certain thresholds.

•Repurchasing shares of its capital stock other than in certain open-market transactions.

•Ceasing to actively conduct certain aspects of its business.

•And/or taking or failing to take any other action that would jeopardize the expected U.S. federal income tax treatment of the distribution and certain related transactions.

These restrictions may limit the Company’s ability to pursue certain strategic transactions or other transactions that it may believe to be in the best interests of its stockholders or that might increase the value of its business.

The Company may be unable to achieve the full strategic and financial benefits expected to result from the Separation, or such benefits may be delayed or not occur at all for a variety of reasons, including, among others, that: (a) management may be required to spend significant amounts of time and effort on post Separation activities, which may divert management’s attention from operating and growing Knife River’s business; (b) Knife River may be more susceptible to market fluctuations and other adverse events than if it was still a part of MDU Resources; (c) Knife River’s business is less diversified than MDU Resources’ business prior to the Separation; and (d) the other actions required to separate MDU Resources’ and Knife River’s respective businesses could disrupt its operations. If the Company fails to achieve some or all of the benefits expected to result from the Separation, or if such benefits are delayed, it could have a material adverse effect on its financial position, results of operations and cash flows.

Prior to the Separation, Knife River and MDU Resources entered into a separation and distribution agreement and also entered into various other agreements, including a transition services agreement, a tax matters agreement and an employee matters agreement. The separation agreement, the tax matters agreement and the employee matters agreement determine the allocation of assets and liabilities between the companies following the Separation for those respective areas and include any necessary indemnifications related to liabilities and obligations. The transition services agreement provides for the performance of certain services by MDU Resources for the benefit of Knife River, or in some cases certain services provided by Knife River for the benefit of MDU Resources, for a limited period of time after the Separation. Knife River will rely on MDU Resources to satisfy its obligations under these agreements. If MDU Resources is unable to satisfy its obligations under these agreements, including its indemnification obligations, Knife River could incur operational difficulties or losses. If Knife River does not have agreements with other providers of these services once certain transaction agreements expire or terminate, Knife River may not be able to operate its business effectively, which may have a material adverse effect on its financial position, results of operations and cash flows.

Disputes may arise between the Company and MDU Resources in a number of areas relating to the various transaction agreements, including: labor, tax, employee benefit, indemnification and other matters arising from the Company’s Separation from MDU Resources; employee retention and recruiting; business combinations involving the Company; and the nature, quality and pricing of services that Knife River and MDU Resources have agreed to provide each other. The Company may not be able to resolve potential conflicts, and even if it does, the resolution may be less favorable than if it were dealing with an unaffiliated party.

Following the Separation, certain management and directors of each of MDU Resources and Knife River own both MDU Resources common stock and Knife River common stock. This ownership overlap could create, or appear to create, potential conflicts of interest when Knife River’s management and directors and MDU Resources’ management and directors face decisions that could have different implications for Knife River and MDU Resources. For example, potential conflicts of interest could arise in connection with the resolution of any dispute between MDU Resources and Knife River regarding the terms of the agreements governing the Separation and the relationship with MDU Resources thereafter. These agreements include the separation and distribution agreement, the tax matters agreement, the employee matters agreement, the transition services agreement, the stockholder and registration rights agreement and any commercial agreements between the parties or their affiliates.

Potential conflicts of interest may also arise out of any commercial arrangements that Knife River or MDU Resources may enter into in the future.

As a public company, Knife River has become subject to the reporting requirements of the Exchange Act, the Sarbanes-Oxley Act and the Dodd-Frank Act and is required to prepare its financial statements according to the rules and regulations required by the SEC. The Company’s failure to prepare and disclose this information in a timely manner or to otherwise comply with applicable law could subject it to penalties under federal securities laws, expose it to lawsuits and restrict its ability to access financing. In addition, the Sarbanes-Oxley Act requires that, among other things, Knife River establish and maintain effective internal controls and procedures for financial reporting and disclosure purposes. Internal control over financial reporting is complex and may be revised over time to adapt to changes in Knife River’s business, or changes in applicable accounting rules. Knife River cannot assure you that its internal control over financial reporting will be effective in the future or that a material weakness will not be discovered with respect to a prior period for which it had previously believed that internal controls were effective. If Knife River is not able to maintain or document effective internal control over financial reporting, its independent registered public accounting firm will not be able to certify as to the effectiveness of its internal control over financial reporting.

Matters affecting Knife River’s internal controls may cause it to be unable to report its financial information on a timely basis, or may cause it to restate previously issued financial information, and thereby subject Knife River to adverse regulatory consequences, including sanctions or investigations by the SEC, or violations of applicable stock exchange listing rules. There could also be a negative reaction in the financial markets due to a loss of investor confidence in Knife River and the reliability of its financial statements. Confidence in the reliability of Knife River’s financial statements is also likely to suffer if it or its independent registered public accounting firm reports a material weakness in its internal control over financial reporting. This could have a material and adverse effect on Knife River by, for example, leading to a decline in the share price and impairing its ability to raise additional capital.

Historically, Knife River’s business has been operated as one of MDU Resources’ business segments, and MDU Resources performed substantially all the corporate functions for Knife River’s operations, including managing financial and human resources systems, internal auditing, investor relations, treasury services, financial reporting, finance and tax administration, benefits administration, legal, and regulatory functions. After the Separation, MDU Resources has provided support to the Company with respect to certain of these functions on a transitional basis. The Company has needed to replicate certain facilities, systems, infrastructure and personnel to which it no longer has access after the Separation and will likely continue to incur capital and other costs associated with developing and implementing its own support functions in these areas.

As an independent, publicly traded company, the Company has become more susceptible to market fluctuations and other adverse events than it would have been were it still a part of MDU Resources. As part of MDU Resources, Knife River was able to enjoy certain benefits from MDU Resources’ operating diversity and available capital for investments. As an independent, publicly traded company, Knife River does not have similar operating diversity and does not have similar access to capital markets, which could have a material adverse effect on its financial position, results of operations and cash flows.