false2025Q2000148695712/31P18Mxbrli:sharesiso4217:USDiso4217:USDxbrli:sharesbwxt:segmentbwxt:componentxbrli:pureiso4217:CADbwxt:employeebwxt:site00014869572025-01-012025-06-3000014869572025-08-0100014869572025-04-012025-06-3000014869572024-04-012024-06-3000014869572024-01-012024-06-3000014869572025-06-3000014869572024-12-310001486957us-gaap:CommonStockMember2024-12-310001486957us-gaap:AdditionalPaidInCapitalMember2024-12-310001486957us-gaap:RetainedEarningsMember2024-12-310001486957us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-12-310001486957us-gaap:TreasuryStockCommonMember2024-12-310001486957us-gaap:ParentMember2024-12-310001486957us-gaap:NoncontrollingInterestMember2024-12-310001486957us-gaap:RetainedEarningsMember2025-01-012025-03-310001486957us-gaap:ParentMember2025-01-012025-03-310001486957us-gaap:NoncontrollingInterestMember2025-01-012025-03-3100014869572025-01-012025-03-310001486957us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-01-012025-03-310001486957us-gaap:CommonStockMember2025-01-012025-03-310001486957us-gaap:AdditionalPaidInCapitalMember2025-01-012025-03-310001486957us-gaap:TreasuryStockCommonMember2025-01-012025-03-310001486957us-gaap:CommonStockMember2025-03-310001486957us-gaap:AdditionalPaidInCapitalMember2025-03-310001486957us-gaap:RetainedEarningsMember2025-03-310001486957us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-03-310001486957us-gaap:TreasuryStockCommonMember2025-03-310001486957us-gaap:ParentMember2025-03-310001486957us-gaap:NoncontrollingInterestMember2025-03-3100014869572025-03-310001486957us-gaap:RetainedEarningsMember2025-04-012025-06-300001486957us-gaap:ParentMember2025-04-012025-06-300001486957us-gaap:NoncontrollingInterestMember2025-04-012025-06-300001486957us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-04-012025-06-300001486957us-gaap:CommonStockMember2025-04-012025-06-300001486957us-gaap:AdditionalPaidInCapitalMember2025-04-012025-06-300001486957us-gaap:TreasuryStockCommonMember2025-04-012025-06-300001486957us-gaap:CommonStockMember2025-06-300001486957us-gaap:AdditionalPaidInCapitalMember2025-06-300001486957us-gaap:RetainedEarningsMember2025-06-300001486957us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-06-300001486957us-gaap:TreasuryStockCommonMember2025-06-300001486957us-gaap:ParentMember2025-06-300001486957us-gaap:NoncontrollingInterestMember2025-06-300001486957us-gaap:CommonStockMember2023-12-310001486957us-gaap:AdditionalPaidInCapitalMember2023-12-310001486957us-gaap:RetainedEarningsMember2023-12-310001486957us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-12-310001486957us-gaap:TreasuryStockCommonMember2023-12-310001486957us-gaap:ParentMember2023-12-310001486957us-gaap:NoncontrollingInterestMember2023-12-3100014869572023-12-310001486957us-gaap:RetainedEarningsMember2024-01-012024-03-310001486957us-gaap:ParentMember2024-01-012024-03-310001486957us-gaap:NoncontrollingInterestMember2024-01-012024-03-3100014869572024-01-012024-03-310001486957us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-01-012024-03-310001486957us-gaap:CommonStockMember2024-01-012024-03-310001486957us-gaap:AdditionalPaidInCapitalMember2024-01-012024-03-310001486957us-gaap:TreasuryStockCommonMember2024-01-012024-03-310001486957us-gaap:CommonStockMember2024-03-310001486957us-gaap:AdditionalPaidInCapitalMember2024-03-310001486957us-gaap:RetainedEarningsMember2024-03-310001486957us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-03-310001486957us-gaap:TreasuryStockCommonMember2024-03-310001486957us-gaap:ParentMember2024-03-310001486957us-gaap:NoncontrollingInterestMember2024-03-3100014869572024-03-310001486957us-gaap:RetainedEarningsMember2024-04-012024-06-300001486957us-gaap:ParentMember2024-04-012024-06-300001486957us-gaap:NoncontrollingInterestMember2024-04-012024-06-300001486957us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-04-012024-06-300001486957us-gaap:TreasuryStockCommonMember2024-04-012024-06-300001486957us-gaap:CommonStockMember2024-04-012024-06-300001486957us-gaap:AdditionalPaidInCapitalMember2024-04-012024-06-300001486957us-gaap:CommonStockMember2024-06-300001486957us-gaap:AdditionalPaidInCapitalMember2024-06-300001486957us-gaap:RetainedEarningsMember2024-06-300001486957us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-06-300001486957us-gaap:TreasuryStockCommonMember2024-06-300001486957us-gaap:ParentMember2024-06-300001486957us-gaap:NoncontrollingInterestMember2024-06-3000014869572024-06-300001486957bwxt:CashHeldForDecommissioningOfFacilitiesMember2025-06-300001486957bwxt:CashHeldToMeetReinsuranceReserveRequirementsMember2025-06-300001486957us-gaap:LandMember2025-06-300001486957us-gaap:LandMember2024-12-310001486957us-gaap:BuildingMember2025-06-300001486957us-gaap:BuildingMember2024-12-310001486957us-gaap:MachineryAndEquipmentMember2025-06-300001486957us-gaap:MachineryAndEquipmentMember2024-12-310001486957us-gaap:AssetUnderConstructionMember2025-06-300001486957us-gaap:AssetUnderConstructionMember2024-12-310001486957us-gaap:AccumulatedTranslationAdjustmentMember2025-06-300001486957us-gaap:AccumulatedTranslationAdjustmentMember2024-12-310001486957us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2025-06-300001486957us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2024-12-310001486957us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2025-06-300001486957us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2024-12-310001486957us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2025-06-300001486957us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2024-12-310001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2025-04-012025-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2024-04-012024-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2025-01-012025-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2024-01-012024-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2025-04-012025-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2024-04-012024-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2025-01-012025-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2024-01-012024-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2025-04-012025-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2024-04-012024-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2025-01-012025-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2024-01-012024-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2025-04-012025-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2024-04-012024-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2025-01-012025-06-300001486957us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2024-01-012024-06-300001486957bwxt:AerojetOrdnanceTennesseeInc.Member2025-01-032025-01-030001486957bwxt:AerojetOrdnanceTennesseeInc.Member2025-01-030001486957bwxt:AerojetOrdnanceTennesseeInc.Memberus-gaap:CustomerRelatedIntangibleAssetsMember2025-01-030001486957bwxt:AerojetOrdnanceTennesseeInc.Memberus-gaap:CustomerRelatedIntangibleAssetsMember2025-01-032025-01-030001486957bwxt:AerojetOrdnanceTennesseeInc.Memberus-gaap:OrderOrProductionBacklogMember2025-01-030001486957bwxt:AerojetOrdnanceTennesseeInc.Memberus-gaap:OrderOrProductionBacklogMember2025-01-032025-01-030001486957bwxt:KinectricsHoldingsInc.Member2025-05-202025-05-200001486957bwxt:KinectricsHoldingsInc.Member2025-05-200001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957country:USbwxt:GovernmentCustomersMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957country:USbwxt:GovernmentCustomersMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957country:USbwxt:NonGovernmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957country:USbwxt:NonGovernmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957country:US2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957country:US2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957country:CAbwxt:GovernmentCustomersMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957country:CAbwxt:GovernmentCustomersMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957country:CAbwxt:NonGovernmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957country:CAbwxt:NonGovernmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957country:CA2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957country:CA2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957bwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957bwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957bwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957bwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957bwxt:OtherGeographicLocationMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957bwxt:OtherGeographicLocationMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMember2024-04-012024-06-300001486957us-gaap:IntersegmentEliminationMember2025-04-012025-06-300001486957us-gaap:IntersegmentEliminationMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957country:USbwxt:GovernmentCustomersMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957country:USbwxt:GovernmentCustomersMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957country:USbwxt:NonGovernmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957country:USbwxt:NonGovernmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957country:US2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:USbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957country:US2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957country:CAbwxt:GovernmentCustomersMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957country:CAbwxt:GovernmentCustomersMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957country:CAbwxt:NonGovernmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957country:CAbwxt:NonGovernmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957country:CA2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMembercountry:CAbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957country:CA2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957bwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957bwxt:OtherGeographicLocationMemberbwxt:GovernmentCustomersMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957bwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957bwxt:OtherGeographicLocationMemberbwxt:NonGovernmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957bwxt:OtherGeographicLocationMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:OtherGeographicLocationMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957bwxt:OtherGeographicLocationMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMember2024-01-012024-06-300001486957us-gaap:IntersegmentEliminationMember2025-01-012025-06-300001486957us-gaap:IntersegmentEliminationMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMemberus-gaap:TransferredOverTimeMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMemberus-gaap:TransferredOverTimeMember2025-04-012025-06-300001486957us-gaap:TransferredOverTimeMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMemberus-gaap:TransferredOverTimeMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMemberus-gaap:TransferredOverTimeMember2024-04-012024-06-300001486957us-gaap:TransferredOverTimeMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMemberus-gaap:TransferredAtPointInTimeMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMemberus-gaap:TransferredAtPointInTimeMember2025-04-012025-06-300001486957us-gaap:TransferredAtPointInTimeMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMemberus-gaap:TransferredAtPointInTimeMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMemberus-gaap:TransferredAtPointInTimeMember2024-04-012024-06-300001486957us-gaap:TransferredAtPointInTimeMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMemberus-gaap:TransferredOverTimeMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMemberus-gaap:TransferredOverTimeMember2025-01-012025-06-300001486957us-gaap:TransferredOverTimeMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMemberus-gaap:TransferredOverTimeMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMemberus-gaap:TransferredOverTimeMember2024-01-012024-06-300001486957us-gaap:TransferredOverTimeMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMemberus-gaap:TransferredAtPointInTimeMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMemberus-gaap:TransferredAtPointInTimeMember2025-01-012025-06-300001486957us-gaap:TransferredAtPointInTimeMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:GovernmentOperationsSegmentMemberus-gaap:TransferredAtPointInTimeMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsSegmentMemberus-gaap:TransferredAtPointInTimeMember2024-01-012024-06-300001486957us-gaap:TransferredAtPointInTimeMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:FixedPriceContractMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:FixedPriceContractMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:FixedPriceContractMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:FixedPriceContractMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:FixedPriceContractMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:FixedPriceContractMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:FirmFixedPriceMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:FirmFixedPriceMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957bwxt:FirmFixedPriceMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:FirmFixedPriceMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:FirmFixedPriceMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957bwxt:FirmFixedPriceMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CostPlusFeeMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CostPlusFeeMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957bwxt:CostPlusFeeMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CostPlusFeeMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CostPlusFeeMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957bwxt:CostPlusFeeMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:TimeAndMaterialsContractMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:TimeAndMaterialsContractMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:TimeAndMaterialsContractMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:TimeAndMaterialsContractMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:TimeAndMaterialsContractMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:TimeAndMaterialsContractMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:FixedPriceContractMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:FixedPriceContractMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:FixedPriceContractMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:FixedPriceContractMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:FixedPriceContractMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:FixedPriceContractMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:FirmFixedPriceMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:FirmFixedPriceMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957bwxt:FirmFixedPriceMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:FirmFixedPriceMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:FirmFixedPriceMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957bwxt:FirmFixedPriceMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CostPlusFeeMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CostPlusFeeMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957bwxt:CostPlusFeeMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CostPlusFeeMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CostPlusFeeMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957bwxt:CostPlusFeeMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:TimeAndMaterialsContractMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:TimeAndMaterialsContractMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:TimeAndMaterialsContractMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:TimeAndMaterialsContractMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberus-gaap:TimeAndMaterialsContractMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:TimeAndMaterialsContractMember2024-01-012024-06-300001486957bwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957bwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957bwxt:ContractsinProgressMember2025-06-300001486957bwxt:ContractsinProgressMember2024-12-310001486957us-gaap:AccountsReceivableMember2025-06-300001486957us-gaap:AccountsReceivableMember2024-12-3100014869572025-07-012025-06-300001486957us-gaap:PensionPlansDefinedBenefitMember2025-04-012025-06-300001486957us-gaap:PensionPlansDefinedBenefitMember2024-04-012024-06-300001486957us-gaap:PensionPlansDefinedBenefitMember2025-01-012025-06-300001486957us-gaap:PensionPlansDefinedBenefitMember2024-01-012024-06-300001486957us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2025-04-012025-06-300001486957us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2024-04-012024-06-300001486957us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2025-01-012025-06-300001486957us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2024-01-012024-06-300001486957us-gaap:MutualFundMemberus-gaap:FairValueMeasurementsRecurringMember2025-06-300001486957us-gaap:MutualFundMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2025-06-300001486957us-gaap:MutualFundMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2025-06-300001486957us-gaap:MutualFundMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2025-06-300001486957us-gaap:FairValueMeasurementsRecurringMember2025-06-300001486957us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2025-06-300001486957us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2025-06-300001486957us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2025-06-300001486957us-gaap:MutualFundMemberus-gaap:FairValueMeasurementsRecurringMember2024-12-310001486957us-gaap:MutualFundMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-12-310001486957us-gaap:MutualFundMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-12-310001486957us-gaap:MutualFundMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-12-310001486957us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2024-12-310001486957us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-12-310001486957us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-12-310001486957us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-12-310001486957us-gaap:FairValueMeasurementsRecurringMember2024-12-310001486957us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-12-310001486957us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-12-310001486957us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-12-310001486957us-gaap:ForeignExchangeContractMember2025-06-300001486957us-gaap:ForeignExchangeContractMember2024-12-310001486957bwxt:SeniorNotesDue2028Memberus-gaap:SeniorNotesMember2025-06-300001486957bwxt:SeniorNotesDue2029Memberus-gaap:SeniorNotesMember2025-06-300001486957bwxt:SeniorNotesDue2028Memberus-gaap:SeniorNotesMember2024-12-310001486957bwxt:SeniorNotesDue2029Memberus-gaap:SeniorNotesMember2024-12-310001486957bwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957bwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957bwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957bwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957bwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957bwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:CorporateNonSegmentMember2025-04-012025-06-300001486957us-gaap:CorporateNonSegmentMember2024-04-012024-06-300001486957us-gaap:CorporateNonSegmentMember2025-01-012025-06-300001486957us-gaap:CorporateNonSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearComponentProgramMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearComponentProgramMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearComponentProgramMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearComponentProgramMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:UraniumAndNuclearServicesMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:UraniumAndNuclearServicesMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:UraniumAndNuclearServicesMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:UraniumAndNuclearServicesMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:CommercialOperationsMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearManufacturingMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearManufacturingMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearManufacturingMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearManufacturingMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearServicesandEngineeringMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearServicesandEngineeringMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearServicesandEngineeringMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957us-gaap:OperatingSegmentsMemberbwxt:NuclearServicesandEngineeringMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-300001486957country:US2025-06-300001486957country:US2024-06-300001486957country:CA2025-06-300001486957country:CA2024-06-300001486957bwxt:AllOtherCountriesMember2025-06-300001486957bwxt:AllOtherCountriesMember2024-06-300001486957bwxt:USGovernmentMemberus-gaap:CustomerConcentrationRiskMemberus-gaap:RevenueFromContractWithCustomerMemberbwxt:GovernmentOperationsSegmentMember2025-04-012025-06-300001486957bwxt:USGovernmentMemberus-gaap:CustomerConcentrationRiskMemberus-gaap:RevenueFromContractWithCustomerMemberbwxt:GovernmentOperationsSegmentMember2024-04-012024-06-300001486957bwxt:USGovernmentMemberus-gaap:CustomerConcentrationRiskMemberus-gaap:RevenueFromContractWithCustomerMemberbwxt:GovernmentOperationsSegmentMember2025-01-012025-06-300001486957bwxt:USGovernmentMemberus-gaap:CustomerConcentrationRiskMemberus-gaap:RevenueFromContractWithCustomerMemberbwxt:GovernmentOperationsSegmentMember2024-01-012024-06-300001486957bwxt:LargeUtilityCustomersMemberus-gaap:CustomerConcentrationRiskMemberus-gaap:RevenueFromContractWithCustomerMemberbwxt:CommercialOperationsSegmentMember2025-04-012025-06-300001486957bwxt:LargeUtilityCustomersMemberus-gaap:CustomerConcentrationRiskMemberus-gaap:RevenueFromContractWithCustomerMemberbwxt:CommercialOperationsSegmentMember2024-04-012024-06-300001486957bwxt:LargeUtilityCustomersMemberus-gaap:CustomerConcentrationRiskMemberus-gaap:RevenueFromContractWithCustomerMemberbwxt:CommercialOperationsSegmentMember2025-01-012025-06-300001486957bwxt:LargeUtilityCustomersMemberus-gaap:CustomerConcentrationRiskMemberus-gaap:RevenueFromContractWithCustomerMemberbwxt:CommercialOperationsSegmentMember2024-01-012024-06-30

 _________________________________________________________________________________________________________________________________ 

 _________________________________________________________________________________________________________________________________ 

For the transition period from                      to                     .

__________________________________________________________________________________________________________________________________

_________________________________________________________________________________________________________________________________

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, 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 is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

The number of shares of the registrant's common stock outstanding at August 1, 2025 was 91,398,740.

We have presented the condensed consolidated financial statements of BWX Technologies, Inc. ("BWXT" or the "Company") in U.S. dollars in accordance with the interim reporting requirements of Form 10-Q, Rule 10-01 of Regulation S-X and accounting principles generally accepted in the United States ("GAAP"). Certain financial information and disclosures normally included in our financial statements prepared annually in accordance with GAAP have been condensed or omitted. Readers of these financial statements should, therefore, refer to the consolidated financial statements and notes in our annual report on Form 10-K for the year ended December 31, 2024 (our "2024 10-K"). We have included all adjustments, in the opinion of management, consisting only of normal recurring adjustments, necessary for a fair presentation.

We use the equity method to account for investments in entities that we do not control, but over which we have the ability to exercise significant influence. We generally refer to these entities as "joint ventures." We have eliminated all intercompany transactions and accounts. We classify assets and liabilities related to long-term contracts as current using the duration of the related contract or program as our operating cycle, which is generally longer than one year. We have recast certain amounts previously reported in our condensed consolidated balance sheets and statements of cash flows to conform to the presentation at June 30, 2025. We present the notes to our condensed consolidated financial statements on the basis of continuing operations, unless otherwise stated.

Unless the context otherwise indicates, "we," "us" and "our" mean BWXT and its consolidated subsidiaries.

We operate in two reportable segments: Government Operations and Commercial Operations. Our reportable segments are further described as follows:

•Our Government Operations segment manufactures naval nuclear reactors, including the related nuclear fuel, for the U.S. Naval Nuclear Propulsion Program for use in submarines and aircraft carriers. Through this segment, we also fabricate fuel-bearing precision components that range in weight from a few grams to hundreds of tons, manufacture electromechanical equipment, perform design, manufacturing, inspection, assembly and testing activities, downblend Cold War-era government stockpiles of high-enriched uranium and develop and manufacture advanced materials and products for commercial, military and space applications. In addition, we supply proprietary and sole-source valves, manifolds and fittings to global naval and commercial shipping customers. In-house capabilities also include wet chemistry uranium processing, advanced heat treatment to optimize component material properties and a controlled, clean-room environment with the capacity to assemble railcar-size components. This segment also provides various other services, primarily through joint ventures, to the U.S. and Canadian Governments including nuclear materials management and operation, environmental management and administrative and operating services for various Government-owned facilities. These services are primarily provided to the U.S. Department of Energy ("DOE"), including the National Nuclear Security Administration, the Office of Nuclear Energy, the Office of Science and the Office of Environmental Management, the Department of Defense and Canadian Nuclear Labs. In addition, this segment also develops technology for advanced nuclear reactors for a variety of power and propulsion applications in the space and terrestrial domains and offers complete advanced nuclear fuel and reactor design and engineering, licensing and manufacturing services for these programs.

•Our Commercial Operations segment fabricates commercial nuclear steam generators, nuclear fuel, fuel handling systems, pressure vessels, reactor components, heat exchangers, tooling delivery systems and other auxiliary equipment, including containers for the storage of spent nuclear fuel and other high-level waste, and supplies nuclear-grade materials and precisely machined components for nuclear utility customers. We have supplied the nuclear industry with more than 1,300 large, heavy components worldwide and are the only commercial heavy nuclear component manufacturer in North America. This segment also provides specialized engineering services that include structural component design, 3-D thermal-hydraulic engineering analysis, weld and robotic process development, electrical and controls engineering and metallurgy and materials engineering. In addition, this segment offers in-plant inspection, maintenance and modification services for nuclear steam generators, heat exchangers, reactors, fuel handling systems and balance of plant equipment, as well as specialized non-destructive examination and tooling/repair solutions. This segment also offers a broad suite of nuclear power plant lifecycle support and management services for the global industry and transmission and distribution markets. This segment also manufactures medical

radioisotopes, radiopharmaceuticals and medical devices, and partners with life science and pharmaceutical companies developing new drugs.

See Note 3 and Note 8 for financial information about our segments. Operating results for the three and six months ended June 30, 2025 are not necessarily indicative of the results that may be expected for the year ending December 31, 2025. For further information, refer to the consolidated financial statements and notes included in our 2024 10-K.

There were no accounting standards adopted during the six months ended June 30, 2025 that had a significant impact on our financial position, results of operations, cash flows or disclosures.

We generally recognize contract revenues and related costs over time for individual performance obligations based on a cost-to-cost method in accordance with Financial Accounting Standards Board ("FASB") Topic Revenue from Contracts with Customers. We recognize estimated contract revenue and resulting income based on the measurement of the extent of progress toward completion as a percentage of the total project. Certain costs may be excluded from the cost-to-cost method of measuring progress, such as significant costs for uninstalled materials, if such costs do not depict our performance in transferring control of goods or services to the customer. We review contract price and cost estimates periodically as the work progresses and reflect adjustments proportionate to the percentage-of-completion in income in the period when those estimates are revised. We recognize revenue on certain cost plus and time and materials contracts equal to the amount we have the right to invoice the customer when performance obligations are satisfied over time and the invoice amount corresponds directly with the value we are providing the customer. Certain of our contracts recognize revenue at a point in time, and revenue on these contracts is recognized when control transfers to the customer. The majority of our revenue that is recognized at a point in time is related to parts and certain medical radioisotopes and radiopharmaceuticals in our Commercial Operations segment. For all contracts, if a current estimate of total contract cost indicates a loss on a contract, the projected loss is recognized in full when determined.

See Note 3 for a further discussion of revenue recognition.

We are subject to federal income tax in the U.S., Canada and various other foreign jurisdictions, as well as income tax within multiple U.S. state jurisdictions. We provide for income taxes based on the enacted tax laws and rates in the jurisdictions in which we conduct our operations. These jurisdictions may have regimes of taxation that vary with respect to nominal rates and with respect to the basis on which these rates are applied. This variation, along with changes in our mix of income within these jurisdictions, can contribute to shifts in our effective tax rate from period to period.

On July 4, 2025, President Trump signed into law an act commonly referred to as the “One Big Beautiful Bill Act”. This bill includes a number of tax provisions including extending existing provisions that were set to expire, substantive changes in international tax rules and the repeal or phase outs of certain energy tax credits. We are currently evaluating the impact of this legislation on our results of operations, financial position and cash flows.

The following table provides a reconciliation of cash and cash equivalents and restricted cash and cash equivalents on our condensed consolidated balance sheets to the totals presented on our condensed consolidated statements of cash flows:

At June 30, 2025 and December 31, 2024, we had inventories totaling $51.6 million and $40.3 million, respectively, consisting almost entirely of raw materials and supplies.

Property, plant and equipment is stated at cost and is set forth below:

The components of Accumulated other comprehensive income (loss) included in Stockholders' Equity are as follows:

The amounts reclassified out of Accumulated other comprehensive income (loss) by component and the affected condensed consolidated statements of income line items are as follows: