0000035315 fmr:C000088099Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_LG_ClassMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_LG_1_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088099_1_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_1_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_1_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_1_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_1_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_1_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_1_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_1_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_1_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_1_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_1_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_LG_2_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088099_2_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_2_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_2_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_2_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_2_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_2_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_2_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_2_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_2_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_2_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_2_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088099_ClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088099_NoLoadClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088099_NoLoadClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088099_NoLoadClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088099_0_AdditionalIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088099_0_AdditionalIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088099_0_AdditionalIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088099_1_BBIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088099_1_BBIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088099_1_BBIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088099Member 2026-08-31 0000035315 fmr:C000088099Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2026-08-31 0000035315 fmr:C000088099Member fmr:QDAAAMember 2026-08-31 0000035315 fmr:C000088099Member fmr:QDAAMember 2026-08-31 0000035315 fmr:C000088099Member fmr:QDAMember 2026-08-31 0000035315 fmr:C000088099Member fmr:QDBBBMember 2026-08-31 0000035315 fmr:C000088099Member fmr:QDBBMember 2026-08-31 0000035315 fmr:C000088099Member fmr:QDBMember 2026-08-31 0000035315 fmr:C000088099Member fmr:QDNotRatedMember 2026-08-31 0000035315 fmr:C000088099Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2026-08-31 0000035315 fmr:AACorporateBondsMember fmr:C000088099Member 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000088099Member 2026-08-31 0000035315 fmr:AAAssetBackedSecuritiesMember fmr:C000088099Member 2026-08-31 0000035315 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000088099Member 2026-08-31 0000035315 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000088099Member 2026-08-31 0000035315 fmr:AAPreferredSecuritiesMember fmr:C000088099Member 2026-08-31 0000035315 fmr:AAOtherInvestmentsMember fmr:C000088099Member 2026-08-31 0000035315 fmr:AAMunicipalSecuritiesMember fmr:C000088099Member 2026-08-31 0000035315 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000088099Member 2026-08-31 0000035315 fmr:C000088099Member country:US 2026-08-31 0000035315 fmr:C000088099Member country:GB 2026-08-31 0000035315 fmr:C000088099Member country:CA 2026-08-31 0000035315 fmr:C000088099Member country:IE 2026-08-31 0000035315 fmr:C000088099Member country:DE 2026-08-31 0000035315 fmr:C000088099Member country:AU 2026-08-31 0000035315 fmr:C000088099Member country:JP 2026-08-31 0000035315 fmr:C000088099Member country:FR 2026-08-31 0000035315 fmr:C000088099Member country:ES 2026-08-31 0000035315 fmr:C000088099Member fmr:OtherMember 2026-08-31 0000035315 fmr:C000088099Member fmr:TH0Member 2026-08-31 0000035315 fmr:C000088099Member fmr:TH1Member 2026-08-31 0000035315 fmr:C000088099Member fmr:TH2Member 2026-08-31 0000035315 fmr:C000088099Member fmr:TH3Member 2026-08-31 0000035315 fmr:C000088099Member fmr:TH4Member 2026-08-31 0000035315 fmr:C000088099Member fmr:TH5Member 2026-08-31 0000035315 fmr:C000088099Member fmr:TH6Member 2026-08-31 0000035315 fmr:C000088099Member fmr:TH7Member 2026-08-31 0000035315 fmr:C000088099Member fmr:TH8Member 2026-08-31 0000035315 fmr:C000088099Member fmr:TH9Member 2026-08-31 0000035315 fmr:C000088100Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_LG_ClassMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_LG_1_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088100_1_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_1_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_1_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_1_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_1_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_1_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_1_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_1_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_1_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_1_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_1_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_LG_2_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088100_2_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_2_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_2_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_2_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_2_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_2_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_2_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_2_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_2_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_2_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_2_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088100_ClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088100_NoLoadClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088100_NoLoadClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088100_NoLoadClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088100_0_AdditionalIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088100_0_AdditionalIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088100_0_AdditionalIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088100_1_BBIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088100_1_BBIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088100_1_BBIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088100Member 2026-08-31 0000035315 fmr:C000088100Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2026-08-31 0000035315 fmr:C000088100Member fmr:QDAAAMember 2026-08-31 0000035315 fmr:C000088100Member fmr:QDAAMember 2026-08-31 0000035315 fmr:C000088100Member fmr:QDAMember 2026-08-31 0000035315 fmr:C000088100Member fmr:QDBBBMember 2026-08-31 0000035315 fmr:C000088100Member fmr:QDBBMember 2026-08-31 0000035315 fmr:C000088100Member fmr:QDBMember 2026-08-31 0000035315 fmr:C000088100Member fmr:QDNotRatedMember 2026-08-31 0000035315 fmr:C000088100Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2026-08-31 0000035315 fmr:AACorporateBondsMember fmr:C000088100Member 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000088100Member 2026-08-31 0000035315 fmr:AAAssetBackedSecuritiesMember fmr:C000088100Member 2026-08-31 0000035315 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000088100Member 2026-08-31 0000035315 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000088100Member 2026-08-31 0000035315 fmr:AAPreferredSecuritiesMember fmr:C000088100Member 2026-08-31 0000035315 fmr:AAOtherInvestmentsMember fmr:C000088100Member 2026-08-31 0000035315 fmr:AAMunicipalSecuritiesMember fmr:C000088100Member 2026-08-31 0000035315 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000088100Member 2026-08-31 0000035315 fmr:C000088100Member country:US 2026-08-31 0000035315 fmr:C000088100Member country:GB 2026-08-31 0000035315 fmr:C000088100Member country:CA 2026-08-31 0000035315 fmr:C000088100Member country:IE 2026-08-31 0000035315 fmr:C000088100Member country:DE 2026-08-31 0000035315 fmr:C000088100Member country:AU 2026-08-31 0000035315 fmr:C000088100Member country:JP 2026-08-31 0000035315 fmr:C000088100Member country:FR 2026-08-31 0000035315 fmr:C000088100Member country:ES 2026-08-31 0000035315 fmr:C000088100Member fmr:OtherMember 2026-08-31 0000035315 fmr:C000088100Member fmr:TH0Member 2026-08-31 0000035315 fmr:C000088100Member fmr:TH1Member 2026-08-31 0000035315 fmr:C000088100Member fmr:TH2Member 2026-08-31 0000035315 fmr:C000088100Member fmr:TH3Member 2026-08-31 0000035315 fmr:C000088100Member fmr:TH4Member 2026-08-31 0000035315 fmr:C000088100Member fmr:TH5Member 2026-08-31 0000035315 fmr:C000088100Member fmr:TH6Member 2026-08-31 0000035315 fmr:C000088100Member fmr:TH7Member 2026-08-31 0000035315 fmr:C000088100Member fmr:TH8Member 2026-08-31 0000035315 fmr:C000088100Member fmr:TH9Member 2026-08-31 0000035315 fmr:C000100043Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_LG_ClassMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000100043_ClassMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_ClassMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_ClassMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_ClassMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_ClassMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_ClassMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_ClassMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_ClassMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_ClassMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_ClassMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_ClassMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_LG_1_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000100043_1_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_1_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_1_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_1_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_1_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_1_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_1_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_1_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_1_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_1_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_1_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000100043_NoLoadClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000100043_NoLoadClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000100043_NoLoadClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000100043_0_BBIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000100043_0_BBIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000100043_0_BBIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000100043Member 2026-08-31 0000035315 fmr:C000100043Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2026-08-31 0000035315 fmr:C000100043Member fmr:QDAAAMember 2026-08-31 0000035315 fmr:C000100043Member fmr:QDAAMember 2026-08-31 0000035315 fmr:C000100043Member fmr:QDAMember 2026-08-31 0000035315 fmr:C000100043Member fmr:QDBBBMember 2026-08-31 0000035315 fmr:C000100043Member fmr:QDBBMember 2026-08-31 0000035315 fmr:C000100043Member fmr:QDNotRatedMember 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000100043Member 2026-08-31 0000035315 fmr:AACorporateBondsMember fmr:C000100043Member 2026-08-31 0000035315 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000100043Member 2026-08-31 0000035315 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000100043Member 2026-08-31 0000035315 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000100043Member 2026-08-31 0000035315 fmr:AAAssetBackedSecuritiesMember fmr:C000100043Member 2026-08-31 0000035315 fmr:AAMunicipalSecuritiesMember fmr:C000100043Member 2026-08-31 0000035315 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000100043Member 2026-08-31 0000035315 fmr:AAOtherInvestmentsMember fmr:C000100043Member 2026-08-31 0000035315 fmr:C000100043Member country:US 2026-08-31 0000035315 fmr:C000100043Member country:CA 2026-08-31 0000035315 fmr:C000100043Member country:GB 2026-08-31 0000035315 fmr:C000100043Member country:JP 2026-08-31 0000035315 fmr:C000100043Member fmr:MultinationalMember 2026-08-31 0000035315 fmr:C000100043Member country:MX 2026-08-31 0000035315 fmr:C000100043Member country:DE 2026-08-31 0000035315 fmr:C000100043Member country:AU 2026-08-31 0000035315 fmr:C000100043Member country:ES 2026-08-31 0000035315 fmr:C000100043Member fmr:OtherMember 2026-08-31 0000035315 fmr:C000100043Member fmr:TH0Member 2026-08-31 0000035315 fmr:C000100043Member fmr:TH1Member 2026-08-31 0000035315 fmr:C000100043Member fmr:TH2Member 2026-08-31 0000035315 fmr:C000100043Member fmr:TH3Member 2026-08-31 0000035315 fmr:C000100043Member fmr:TH4Member 2026-08-31 0000035315 fmr:C000100043Member fmr:TH5Member 2026-08-31 0000035315 fmr:C000100043Member fmr:TH6Member 2026-08-31 0000035315 fmr:C000100043Member fmr:TH7Member 2026-08-31 0000035315 fmr:C000100043Member fmr:TH8Member 2026-08-31 0000035315 fmr:C000100043Member fmr:TH9Member 2026-08-31 0000035315 fmr:C000205023Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_LG_ClassMember_9YRMember 2017-08-31 2026-08-31 0000035315 fmr:C000205023_ClassMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_ClassMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_ClassMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_ClassMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_ClassMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_ClassMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_ClassMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_ClassMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_ClassMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_LG_1_AdditionalIndexMember_9YRMember 2017-08-31 2026-08-31 0000035315 fmr:C000205023_1_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_1_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_1_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_1_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_1_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_1_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_1_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_1_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_1_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_LG_2_AdditionalIndexMember_9YRMember 2017-08-31 2026-08-31 0000035315 fmr:C000205023_2_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_2_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_2_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_2_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_2_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_2_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_2_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_2_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_2_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_NoLoadClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000205023_NoLoadClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000205023_NoLoadClassMember_2025-09-01_2026-08-31Member 2025-08-31 2026-08-31 0000035315 fmr:C000205023_0_AdditionalIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000205023_0_AdditionalIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000205023_0_AdditionalIndexMember_LOCMember 2025-08-31 2026-08-31 0000035315 fmr:C000205023_1_BBIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000205023_1_BBIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000205023_1_BBIndexMember_LOCMember 2025-08-31 2026-08-31 0000035315 fmr:C000205023Member 2018-10-02 2026-08-31 0000035315 fmr:C000205023Member 2026-08-31 0000035315 fmr:C000205023Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2026-08-31 0000035315 fmr:C000205023Member fmr:QDAAAMember 2026-08-31 0000035315 fmr:C000205023Member fmr:QDAAMember 2026-08-31 0000035315 fmr:C000205023Member fmr:QDAMember 2026-08-31 0000035315 fmr:C000205023Member fmr:QDBBBMember 2026-08-31 0000035315 fmr:C000205023Member fmr:QDBBMember 2026-08-31 0000035315 fmr:C000205023Member fmr:QDBMember 2026-08-31 0000035315 fmr:C000205023Member fmr:QDNotRatedMember 2026-08-31 0000035315 fmr:C000205023Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2026-08-31 0000035315 fmr:AACorporateBondsMember fmr:C000205023Member 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000205023Member 2026-08-31 0000035315 fmr:AAAssetBackedSecuritiesMember fmr:C000205023Member 2026-08-31 0000035315 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000205023Member 2026-08-31 0000035315 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000205023Member 2026-08-31 0000035315 fmr:AAPreferredSecuritiesMember fmr:C000205023Member 2026-08-31 0000035315 fmr:AAOtherInvestmentsMember fmr:C000205023Member 2026-08-31 0000035315 fmr:AAMunicipalSecuritiesMember fmr:C000205023Member 2026-08-31 0000035315 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000205023Member 2026-08-31 0000035315 fmr:C000205023Member country:US 2026-08-31 0000035315 fmr:C000205023Member country:GB 2026-08-31 0000035315 fmr:C000205023Member country:CA 2026-08-31 0000035315 fmr:C000205023Member country:IE 2026-08-31 0000035315 fmr:C000205023Member country:DE 2026-08-31 0000035315 fmr:C000205023Member country:AU 2026-08-31 0000035315 fmr:C000205023Member country:JP 2026-08-31 0000035315 fmr:C000205023Member country:FR 2026-08-31 0000035315 fmr:C000205023Member country:ES 2026-08-31 0000035315 fmr:C000205023Member fmr:OtherMember 2026-08-31 0000035315 fmr:C000205023Member fmr:TH0Member 2026-08-31 0000035315 fmr:C000205023Member fmr:TH1Member 2026-08-31 0000035315 fmr:C000205023Member fmr:TH2Member 2026-08-31 0000035315 fmr:C000205023Member fmr:TH3Member 2026-08-31 0000035315 fmr:C000205023Member fmr:TH4Member 2026-08-31 0000035315 fmr:C000205023Member fmr:TH5Member 2026-08-31 0000035315 fmr:C000205023Member fmr:TH6Member 2026-08-31 0000035315 fmr:C000205023Member fmr:TH7Member 2026-08-31 0000035315 fmr:C000205023Member fmr:TH8Member 2026-08-31 0000035315 fmr:C000205023Member fmr:TH9Member 2026-08-31 0000035315 fmr:C000168450Member 2025-08-31 2026-08-31 0000035315 fmr:C000168450Member 2026-08-31 0000035315 fmr:C000168450Member fmr:EMD0Member 2026-08-31 0000035315 fmr:C000168450Member fmr:EMD1Member 2026-08-31 0000035315 fmr:C000168450Member fmr:EMD2Member 2026-08-31 0000035315 fmr:C000168450Member fmr:EMD3Member 2026-08-31 0000035315 fmr:C000168450Member fmr:EMD4Member 2026-08-31 0000035315 fmr:C000168450Member fmr:EMD5Member 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000168450Member 2026-08-31 0000035315 fmr:AARepurchaseAgreementsMember fmr:C000168450Member 2026-08-31 0000035315 fmr:AAUSGovernmentAgencyDebtMember fmr:C000168450Member 2026-08-31 0000035315 fmr:AANetOtherAssetsLiabilitiesMember fmr:C000168450Member 2026-08-31 0000035315 fmr:C000211071Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_LG_ClassMember_8YRMember 2018-08-31 2026-08-31 0000035315 fmr:C000211071_ClassMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_ClassMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_ClassMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_ClassMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_ClassMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_ClassMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_ClassMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_ClassMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_LG_1_AdditionalIndexMember_8YRMember 2018-08-31 2026-08-31 0000035315 fmr:C000211071_1_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_1_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_1_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_1_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_1_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_1_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_1_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_1_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_NoLoadClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000211071_NoLoadClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000211071_NoLoadClassMember_2025-09-01_2026-08-31Member 2025-08-31 2026-08-31 0000035315 fmr:C000211071_0_BBIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000211071_0_BBIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000211071_0_BBIndexMember_LOCMember 2025-08-31 2026-08-31 0000035315 fmr:C000211071Member 2019-04-26 2026-08-31 0000035315 fmr:C000211071Member 2026-08-31 0000035315 fmr:C000211071Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2026-08-31 0000035315 fmr:C000211071Member fmr:QDAAAMember 2026-08-31 0000035315 fmr:C000211071Member fmr:QDAAMember 2026-08-31 0000035315 fmr:C000211071Member fmr:QDAMember 2026-08-31 0000035315 fmr:C000211071Member fmr:QDBBBMember 2026-08-31 0000035315 fmr:C000211071Member fmr:QDBBMember 2026-08-31 0000035315 fmr:C000211071Member fmr:QDNotRatedMember 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000211071Member 2026-08-31 0000035315 fmr:AACorporateBondsMember fmr:C000211071Member 2026-08-31 0000035315 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000211071Member 2026-08-31 0000035315 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000211071Member 2026-08-31 0000035315 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000211071Member 2026-08-31 0000035315 fmr:AAAssetBackedSecuritiesMember fmr:C000211071Member 2026-08-31 0000035315 fmr:AAMunicipalSecuritiesMember fmr:C000211071Member 2026-08-31 0000035315 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000211071Member 2026-08-31 0000035315 fmr:AAOtherInvestmentsMember fmr:C000211071Member 2026-08-31 0000035315 fmr:C000211071Member country:US 2026-08-31 0000035315 fmr:C000211071Member country:CA 2026-08-31 0000035315 fmr:C000211071Member country:GB 2026-08-31 0000035315 fmr:C000211071Member country:JP 2026-08-31 0000035315 fmr:C000211071Member fmr:MultinationalMember 2026-08-31 0000035315 fmr:C000211071Member country:MX 2026-08-31 0000035315 fmr:C000211071Member country:AU 2026-08-31 0000035315 fmr:C000211071Member country:ES 2026-08-31 0000035315 fmr:C000211071Member country:DE 2026-08-31 0000035315 fmr:C000211071Member fmr:OtherMember 2026-08-31 0000035315 fmr:C000211071Member fmr:TH0Member 2026-08-31 0000035315 fmr:C000211071Member fmr:TH1Member 2026-08-31 0000035315 fmr:C000211071Member fmr:TH2Member 2026-08-31 0000035315 fmr:C000211071Member fmr:TH3Member 2026-08-31 0000035315 fmr:C000211071Member fmr:TH4Member 2026-08-31 0000035315 fmr:C000211071Member fmr:TH5Member 2026-08-31 0000035315 fmr:C000211071Member fmr:TH6Member 2026-08-31 0000035315 fmr:C000211071Member fmr:TH7Member 2026-08-31 0000035315 fmr:C000211071Member fmr:TH8Member 2026-08-31 0000035315 fmr:C000211071Member fmr:TH9Member 2026-08-31 0000035315 fmr:C000088097Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_LG_ClassMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_LG_1_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088097_1_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_1_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_1_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_1_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_1_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_1_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_1_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_1_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_1_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_1_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_1_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_LG_2_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088097_2_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_2_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_2_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_2_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_2_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_2_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_2_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_2_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_2_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_2_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_2_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088097_ClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088097_NoLoadClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088097_NoLoadClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088097_NoLoadClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088097_0_AdditionalIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088097_0_AdditionalIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088097_0_AdditionalIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088097_1_BBIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088097_1_BBIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088097_1_BBIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088097Member 2026-08-31 0000035315 fmr:C000088097Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2026-08-31 0000035315 fmr:C000088097Member fmr:QDAAAMember 2026-08-31 0000035315 fmr:C000088097Member fmr:QDAAMember 2026-08-31 0000035315 fmr:C000088097Member fmr:QDAMember 2026-08-31 0000035315 fmr:C000088097Member fmr:QDBBBMember 2026-08-31 0000035315 fmr:C000088097Member fmr:QDBBMember 2026-08-31 0000035315 fmr:C000088097Member fmr:QDBMember 2026-08-31 0000035315 fmr:C000088097Member fmr:QDNotRatedMember 2026-08-31 0000035315 fmr:C000088097Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2026-08-31 0000035315 fmr:AACorporateBondsMember fmr:C000088097Member 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000088097Member 2026-08-31 0000035315 fmr:AAAssetBackedSecuritiesMember fmr:C000088097Member 2026-08-31 0000035315 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000088097Member 2026-08-31 0000035315 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000088097Member 2026-08-31 0000035315 fmr:AAPreferredSecuritiesMember fmr:C000088097Member 2026-08-31 0000035315 fmr:AAOtherInvestmentsMember fmr:C000088097Member 2026-08-31 0000035315 fmr:AAMunicipalSecuritiesMember fmr:C000088097Member 2026-08-31 0000035315 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000088097Member 2026-08-31 0000035315 fmr:C000088097Member country:US 2026-08-31 0000035315 fmr:C000088097Member country:GB 2026-08-31 0000035315 fmr:C000088097Member country:CA 2026-08-31 0000035315 fmr:C000088097Member country:IE 2026-08-31 0000035315 fmr:C000088097Member country:DE 2026-08-31 0000035315 fmr:C000088097Member country:AU 2026-08-31 0000035315 fmr:C000088097Member country:JP 2026-08-31 0000035315 fmr:C000088097Member country:FR 2026-08-31 0000035315 fmr:C000088097Member country:ES 2026-08-31 0000035315 fmr:C000088097Member fmr:OtherMember 2026-08-31 0000035315 fmr:C000088097Member fmr:TH0Member 2026-08-31 0000035315 fmr:C000088097Member fmr:TH1Member 2026-08-31 0000035315 fmr:C000088097Member fmr:TH2Member 2026-08-31 0000035315 fmr:C000088097Member fmr:TH3Member 2026-08-31 0000035315 fmr:C000088097Member fmr:TH4Member 2026-08-31 0000035315 fmr:C000088097Member fmr:TH5Member 2026-08-31 0000035315 fmr:C000088097Member fmr:TH6Member 2026-08-31 0000035315 fmr:C000088097Member fmr:TH7Member 2026-08-31 0000035315 fmr:C000088097Member fmr:TH8Member 2026-08-31 0000035315 fmr:C000088097Member fmr:TH9Member 2026-08-31 0000035315 fmr:C000069436Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_LG_ClassMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000069436_ClassMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_ClassMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_ClassMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_ClassMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_ClassMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_ClassMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_ClassMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_ClassMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_ClassMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_ClassMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_ClassMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_LG_1_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000069436_1_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_1_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_1_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_1_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_1_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_1_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_1_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_1_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_1_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_1_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_1_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000069436_NoLoadClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000069436_NoLoadClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000069436_NoLoadClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000069436_0_BBIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000069436_0_BBIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000069436_0_BBIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000069436Member 2026-08-31 0000035315 fmr:C000069436Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2026-08-31 0000035315 fmr:C000069436Member fmr:QDAAAMember 2026-08-31 0000035315 fmr:C000069436Member fmr:QDAAMember 2026-08-31 0000035315 fmr:C000069436Member fmr:QDAMember 2026-08-31 0000035315 fmr:C000069436Member fmr:QDBBBMember 2026-08-31 0000035315 fmr:C000069436Member fmr:QDBBMember 2026-08-31 0000035315 fmr:C000069436Member fmr:QDBMember 2026-08-31 0000035315 fmr:C000069436Member fmr:QDCCCCCCMember 2026-08-31 0000035315 fmr:C000069436Member fmr:QDNotRatedMember 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000069436Member 2026-08-31 0000035315 fmr:AACorporateBondsMember fmr:C000069436Member 2026-08-31 0000035315 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000069436Member 2026-08-31 0000035315 fmr:AAAssetBackedSecuritiesMember fmr:C000069436Member 2026-08-31 0000035315 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000069436Member 2026-08-31 0000035315 fmr:AAOtherInvestmentsMember fmr:C000069436Member 2026-08-31 0000035315 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000069436Member 2026-08-31 0000035315 fmr:AAOptionsMember fmr:C000069436Member 2026-08-31 0000035315 fmr:AAPreferredSecuritiesMember fmr:C000069436Member 2026-08-31 0000035315 fmr:C000069436Member country:US 2026-08-31 0000035315 fmr:C000069436Member fmr:GrandCaymanUKOverseasTerMember 2026-08-31 0000035315 fmr:C000069436Member country:GB 2026-08-31 0000035315 fmr:C000069436Member country:MX 2026-08-31 0000035315 fmr:C000069436Member fmr:BailiwickOfJerseyMember 2026-08-31 0000035315 fmr:C000069436Member country:IE 2026-08-31 0000035315 fmr:C000069436Member country:DE 2026-08-31 0000035315 fmr:C000069436Member country:JP 2026-08-31 0000035315 fmr:C000069436Member country:CH 2026-08-31 0000035315 fmr:C000069436Member fmr:OtherMember 2026-08-31 0000035315 fmr:C000069436Member fmr:TH0Member 2026-08-31 0000035315 fmr:C000069436Member fmr:TH1Member 2026-08-31 0000035315 fmr:C000069436Member fmr:TH2Member 2026-08-31 0000035315 fmr:C000069436Member fmr:TH3Member 2026-08-31 0000035315 fmr:C000069436Member fmr:TH4Member 2026-08-31 0000035315 fmr:C000069436Member fmr:TH5Member 2026-08-31 0000035315 fmr:C000069436Member fmr:TH6Member 2026-08-31 0000035315 fmr:C000069436Member fmr:TH7Member 2026-08-31 0000035315 fmr:C000069436Member fmr:TH8Member 2026-08-31 0000035315 fmr:C000069436Member fmr:TH9Member 2026-08-31 0000035315 fmr:C000088096Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_LG_ClassMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088096_ClassMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_ClassMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_ClassMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_ClassMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_ClassMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_ClassMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_ClassMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_ClassMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_ClassMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_ClassMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_ClassMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_LG_1_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088096_1_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_1_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_1_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_1_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_1_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_1_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_1_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_1_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_1_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_1_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_1_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_LG_2_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088096_2_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_2_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_2_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_2_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_2_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_2_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_2_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_2_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_2_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_2_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_2_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088096_NoLoadClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088096_NoLoadClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088096_NoLoadClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088096_0_AdditionalIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088096_0_AdditionalIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088096_0_AdditionalIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088096_1_BBIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088096_1_BBIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088096_1_BBIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088096Member 2026-08-31 0000035315 fmr:C000088096Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2026-08-31 0000035315 fmr:C000088096Member fmr:QDAAAMember 2026-08-31 0000035315 fmr:C000088096Member fmr:QDAAMember 2026-08-31 0000035315 fmr:C000088096Member fmr:QDAMember 2026-08-31 0000035315 fmr:C000088096Member fmr:QDBBBMember 2026-08-31 0000035315 fmr:C000088096Member fmr:QDBBMember 2026-08-31 0000035315 fmr:C000088096Member fmr:QDBMember 2026-08-31 0000035315 fmr:C000088096Member fmr:QDNotRatedMember 2026-08-31 0000035315 fmr:C000088096Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2026-08-31 0000035315 fmr:AACorporateBondsMember fmr:C000088096Member 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000088096Member 2026-08-31 0000035315 fmr:AAAssetBackedSecuritiesMember fmr:C000088096Member 2026-08-31 0000035315 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000088096Member 2026-08-31 0000035315 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000088096Member 2026-08-31 0000035315 fmr:AAPreferredSecuritiesMember fmr:C000088096Member 2026-08-31 0000035315 fmr:AAOtherInvestmentsMember fmr:C000088096Member 2026-08-31 0000035315 fmr:AAMunicipalSecuritiesMember fmr:C000088096Member 2026-08-31 0000035315 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000088096Member 2026-08-31 0000035315 fmr:C000088096Member country:US 2026-08-31 0000035315 fmr:C000088096Member country:GB 2026-08-31 0000035315 fmr:C000088096Member country:CA 2026-08-31 0000035315 fmr:C000088096Member country:IE 2026-08-31 0000035315 fmr:C000088096Member country:DE 2026-08-31 0000035315 fmr:C000088096Member country:AU 2026-08-31 0000035315 fmr:C000088096Member country:JP 2026-08-31 0000035315 fmr:C000088096Member country:FR 2026-08-31 0000035315 fmr:C000088096Member country:ES 2026-08-31 0000035315 fmr:C000088096Member fmr:OtherMember 2026-08-31 0000035315 fmr:C000088096Member fmr:TH0Member 2026-08-31 0000035315 fmr:C000088096Member fmr:TH1Member 2026-08-31 0000035315 fmr:C000088096Member fmr:TH2Member 2026-08-31 0000035315 fmr:C000088096Member fmr:TH3Member 2026-08-31 0000035315 fmr:C000088096Member fmr:TH4Member 2026-08-31 0000035315 fmr:C000088096Member fmr:TH5Member 2026-08-31 0000035315 fmr:C000088096Member fmr:TH6Member 2026-08-31 0000035315 fmr:C000088096Member fmr:TH7Member 2026-08-31 0000035315 fmr:C000088096Member fmr:TH8Member 2026-08-31 0000035315 fmr:C000088096Member fmr:TH9Member 2026-08-31 0000035315 fmr:C000153158Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_LG_ClassMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000153158_ClassMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_ClassMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_ClassMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_ClassMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_ClassMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_ClassMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_ClassMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_ClassMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_ClassMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_ClassMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_ClassMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_LG_1_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000153158_1_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_1_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_1_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_1_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_1_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_1_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_1_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_1_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_1_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_1_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_1_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_LG_2_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000153158_2_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_2_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_2_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_2_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_2_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_2_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_2_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_2_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_2_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_2_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_2_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000153158_NoLoadClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000153158_NoLoadClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000153158_NoLoadClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000153158_0_AdditionalIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000153158_0_AdditionalIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000153158_0_AdditionalIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000153158_1_BBIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000153158_1_BBIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000153158_1_BBIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000153158Member 2026-08-31 0000035315 fmr:C000153158Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2026-08-31 0000035315 fmr:C000153158Member fmr:QDAAAMember 2026-08-31 0000035315 fmr:C000153158Member fmr:QDAAMember 2026-08-31 0000035315 fmr:C000153158Member fmr:QDAMember 2026-08-31 0000035315 fmr:C000153158Member fmr:QDBBBMember 2026-08-31 0000035315 fmr:C000153158Member fmr:QDBBMember 2026-08-31 0000035315 fmr:C000153158Member fmr:QDNotRatedMember 2026-08-31 0000035315 fmr:C000153158Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2026-08-31 0000035315 fmr:AACorporateBondsMember fmr:C000153158Member 2026-08-31 0000035315 fmr:AAAssetBackedSecuritiesMember fmr:C000153158Member 2026-08-31 0000035315 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000153158Member 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000153158Member 2026-08-31 0000035315 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000153158Member 2026-08-31 0000035315 fmr:AAOtherInvestmentsMember fmr:C000153158Member 2026-08-31 0000035315 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000153158Member 2026-08-31 0000035315 fmr:C000153158Member country:US 2026-08-31 0000035315 fmr:C000153158Member country:GB 2026-08-31 0000035315 fmr:C000153158Member fmr:GrandCaymanUKOverseasTerMember 2026-08-31 0000035315 fmr:C000153158Member country:DE 2026-08-31 0000035315 fmr:C000153158Member country:JP 2026-08-31 0000035315 fmr:C000153158Member country:CA 2026-08-31 0000035315 fmr:C000153158Member country:IE 2026-08-31 0000035315 fmr:C000153158Member fmr:BailiwickOfJerseyMember 2026-08-31 0000035315 fmr:C000153158Member country:NL 2026-08-31 0000035315 fmr:C000153158Member fmr:OtherMember 2026-08-31 0000035315 fmr:C000153158Member fmr:TH0Member 2026-08-31 0000035315 fmr:C000153158Member fmr:TH1Member 2026-08-31 0000035315 fmr:C000153158Member fmr:TH2Member 2026-08-31 0000035315 fmr:C000153158Member fmr:TH3Member 2026-08-31 0000035315 fmr:C000153158Member fmr:TH4Member 2026-08-31 0000035315 fmr:C000153158Member fmr:TH5Member 2026-08-31 0000035315 fmr:C000153158Member fmr:TH6Member 2026-08-31 0000035315 fmr:C000153158Member fmr:TH7Member 2026-08-31 0000035315 fmr:C000153158Member fmr:TH8Member 2026-08-31 0000035315 fmr:C000153158Member fmr:TH9Member 2026-08-31 0000035315 fmr:C000177581Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_LG_ClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000177581_ClassMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_ClassMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_ClassMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_ClassMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_ClassMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_ClassMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_ClassMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_ClassMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_ClassMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_ClassMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_LG_1_AdditionalIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000177581_1_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_1_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_1_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_1_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_1_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_1_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_1_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_1_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_1_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_1_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_NoLoadClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000177581_NoLoadClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000177581_NoLoadClassMember_2025-09-01_2026-08-31Member 2025-08-31 2026-08-31 0000035315 fmr:C000177581_0_BBIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000177581_0_BBIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000177581_0_BBIndexMember_LOCMember 2025-08-31 2026-08-31 0000035315 fmr:C000177581Member 2017-03-09 2026-08-31 0000035315 fmr:C000177581Member 2026-08-31 0000035315 fmr:C000177581Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2026-08-31 0000035315 fmr:C000177581Member fmr:QDAAAMember 2026-08-31 0000035315 fmr:C000177581Member fmr:QDAAMember 2026-08-31 0000035315 fmr:C000177581Member fmr:QDAMember 2026-08-31 0000035315 fmr:C000177581Member fmr:QDBBBMember 2026-08-31 0000035315 fmr:C000177581Member fmr:QDBBMember 2026-08-31 0000035315 fmr:C000177581Member fmr:QDNotRatedMember 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000177581Member 2026-08-31 0000035315 fmr:AACorporateBondsMember fmr:C000177581Member 2026-08-31 0000035315 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000177581Member 2026-08-31 0000035315 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000177581Member 2026-08-31 0000035315 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000177581Member 2026-08-31 0000035315 fmr:AAAssetBackedSecuritiesMember fmr:C000177581Member 2026-08-31 0000035315 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000177581Member 2026-08-31 0000035315 fmr:AAMunicipalSecuritiesMember fmr:C000177581Member 2026-08-31 0000035315 fmr:AAOtherInvestmentsMember fmr:C000177581Member 2026-08-31 0000035315 fmr:AAPreferredSecuritiesMember fmr:C000177581Member 2026-08-31 0000035315 fmr:C000177581Member country:US 2026-08-31 0000035315 fmr:C000177581Member country:CA 2026-08-31 0000035315 fmr:C000177581Member country:GB 2026-08-31 0000035315 fmr:C000177581Member country:JP 2026-08-31 0000035315 fmr:C000177581Member fmr:MultinationalMember 2026-08-31 0000035315 fmr:C000177581Member country:MX 2026-08-31 0000035315 fmr:C000177581Member country:AU 2026-08-31 0000035315 fmr:C000177581Member country:ES 2026-08-31 0000035315 fmr:C000177581Member country:BE 2026-08-31 0000035315 fmr:C000177581Member fmr:OtherMember 2026-08-31 0000035315 fmr:C000177581Member fmr:TH0Member 2026-08-31 0000035315 fmr:C000177581Member fmr:TH1Member 2026-08-31 0000035315 fmr:C000177581Member fmr:TH2Member 2026-08-31 0000035315 fmr:C000177581Member fmr:TH3Member 2026-08-31 0000035315 fmr:C000177581Member fmr:TH4Member 2026-08-31 0000035315 fmr:C000177581Member fmr:TH5Member 2026-08-31 0000035315 fmr:C000177581Member fmr:TH6Member 2026-08-31 0000035315 fmr:C000177581Member fmr:TH7Member 2026-08-31 0000035315 fmr:C000177581Member fmr:TH8Member 2026-08-31 0000035315 fmr:C000177581Member fmr:TH9Member 2026-08-31 0000035315 fmr:C000088101Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_LG_ClassMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088101_ClassMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_ClassMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_ClassMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_ClassMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_ClassMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_ClassMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_ClassMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_ClassMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_ClassMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_ClassMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_ClassMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_LG_1_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088101_1_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_1_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_1_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_1_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_1_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_1_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_1_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_1_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_1_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_1_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_1_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_LG_2_AdditionalIndexMember_11YRMember 2015-08-31 2026-08-31 0000035315 fmr:C000088101_2_AdditionalIndexMember_AsOf_2016Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_2_AdditionalIndexMember_AsOf_2017Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_2_AdditionalIndexMember_AsOf_2018Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_2_AdditionalIndexMember_AsOf_2019Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_2_AdditionalIndexMember_AsOf_2020Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_2_AdditionalIndexMember_AsOf_2021Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_2_AdditionalIndexMember_AsOf_2022Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_2_AdditionalIndexMember_AsOf_2023Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_2_AdditionalIndexMember_AsOf_2024Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_2_AdditionalIndexMember_AsOf_2025Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_2_AdditionalIndexMember_AsOf_2026Member 2025-08-31 2026-08-31 0000035315 fmr:C000088101_NoLoadClassMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088101_NoLoadClassMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088101_NoLoadClassMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088101_0_AdditionalIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088101_0_AdditionalIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088101_0_AdditionalIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088101_1_BBIndexMember_1YRMember 2025-08-31 2026-08-31 0000035315 fmr:C000088101_1_BBIndexMember_5YRMember 2021-08-31 2026-08-31 0000035315 fmr:C000088101_1_BBIndexMember_10YRMember 2016-08-31 2026-08-31 0000035315 fmr:C000088101Member 2026-08-31 0000035315 fmr:C000088101Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2026-08-31 0000035315 fmr:C000088101Member fmr:QDAAAMember 2026-08-31 0000035315 fmr:C000088101Member fmr:QDAAMember 2026-08-31 0000035315 fmr:C000088101Member fmr:QDAMember 2026-08-31 0000035315 fmr:C000088101Member fmr:QDBBBMember 2026-08-31 0000035315 fmr:C000088101Member fmr:QDBBMember 2026-08-31 0000035315 fmr:C000088101Member fmr:QDBMember 2026-08-31 0000035315 fmr:C000088101Member fmr:QDNotRatedMember 2026-08-31 0000035315 fmr:C000088101Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2026-08-31 0000035315 fmr:AACorporateBondsMember fmr:C000088101Member 2026-08-31 0000035315 fmr:AAUSTreasuryObligationsMember fmr:C000088101Member 2026-08-31 0000035315 fmr:AAAssetBackedSecuritiesMember fmr:C000088101Member 2026-08-31 0000035315 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000088101Member 2026-08-31 0000035315 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000088101Member 2026-08-31 0000035315 fmr:AAPreferredSecuritiesMember fmr:C000088101Member 2026-08-31 0000035315 fmr:AAOtherInvestmentsMember fmr:C000088101Member 2026-08-31 0000035315 fmr:AAMunicipalSecuritiesMember fmr:C000088101Member 2026-08-31 0000035315 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000088101Member 2026-08-31 0000035315 fmr:C000088101Member country:US 2026-08-31 0000035315 fmr:C000088101Member country:GB 2026-08-31 0000035315 fmr:C000088101Member country:CA 2026-08-31 0000035315 fmr:C000088101Member country:IE 2026-08-31 0000035315 fmr:C000088101Member country:DE 2026-08-31 0000035315 fmr:C000088101Member country:AU 2026-08-31 0000035315 fmr:C000088101Member country:JP 2026-08-31 0000035315 fmr:C000088101Member country:FR 2026-08-31 0000035315 fmr:C000088101Member country:ES 2026-08-31 0000035315 fmr:C000088101Member fmr:OtherMember 2026-08-31 0000035315 fmr:C000088101Member fmr:TH0Member 2026-08-31 0000035315 fmr:C000088101Member fmr:TH1Member 2026-08-31 0000035315 fmr:C000088101Member fmr:TH2Member 2026-08-31 0000035315 fmr:C000088101Member fmr:TH3Member 2026-08-31 0000035315 fmr:C000088101Member fmr:TH4Member 2026-08-31 0000035315 fmr:C000088101Member fmr:TH5Member 2026-08-31 0000035315 fmr:C000088101Member fmr:TH6Member 2026-08-31 0000035315 fmr:C000088101Member fmr:TH7Member 2026-08-31 0000035315 fmr:C000088101Member fmr:TH8Member 2026-08-31 0000035315 fmr:C000088101Member fmr:TH9Member 2026-08-31 0000035315 2025-08-31 2026-08-31 iso4217:USD pure shares N-CSR false 0000035315 N-1A Fidelity Salem Street Trust 2026-08-31 Fidelity® Corporate Bond Fund Fidelity Advisor® Corporate Bond Fund Class C FCCCX This annual shareholder report contains information about Fidelity® Corporate Bond Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Class C</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>153<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">1.52<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 153 0.0152 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds achieved a gain for the 12 months ending August 31, 2026, buoyed by three policy interest-rate cuts by the Federal Reserve in late 2025, but pulled down since then by rising bond yields amid higher consumer inflation, a resilient economy and heavy U.S. Treasury issuance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, security selection contributed to the fund's performance versus the benchmark Bloomberg U.S. Credit Bond Index for the fiscal year, whereas sector positioning slightly detracted.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Bond picks among companies in the financials and industrials sectors contributed roughly equally this year. Within financials, broadly diversified exposure to banks and insurance companies, along with holdings of real estate investment trusts, helped the most. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Within industrials, companies in consumer-related industries added the most value. In consumer non-cyclicals, pharmaceutical company Bayer was a notable standout. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Outside of corporate credit, an allocation to U.S. Treasurys and cash - held for liquidity and risk-management purposes - meaningfully dampened the fund's relative result. Underweighting sovereign bonds was another modest detractor. These negatives were somewhat offset by steering clear of other government-related categories, as these bonds lagged credit amid extensive government borrowing, persistent inflation and rising yields. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>During the period, the fund's managers continued to emphasize issuers rated BBB, as they believe there is opportunity for alpha potential over time resulting from improving credit quality. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Noteworthy positioning changes included increasing the allocation to technology issuers, mainly by adding AI-linked companies, such as Nvidia, Alphabet, Meta Platforms and Oracle. Additionally, the fund increased its exposure to finance companies, primarily aircraft lessors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As of August 31, the fund maintained overweight allocations in financial institutions and utilities, and underweight exposure to industrials.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As the fund's managers continued to put capital to work in the corporate market, the portfolio's combined allocation to Treasurys and cash was significantly reduced during the period, from roughly 12% at the beginning to about 4% at the end.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2016 through August 31, 2026. Initial investment of $10,000. Class C $10,000 $10,175 $10,000 $11,178 $11,965 $12,139 $10,141 $10,135 $11,017 $11,419 $11,580 Bloomberg U.S. Credit Bond Index $10,000 $10,190 $10,090 $11,400 $12,209 $12,486 $10,684 $10,774 $11,742 $12,203 $12,444 Bloomberg U.S. Aggregate Bond Index $10,000 $10,049 $9,944 $10,955 $11,665 $11,655 $10,313 $10,189 $10,933 $11,276 $11,489   2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class C</span> 10000 10175 10000 11178 11965 12139 10141 10135 11017 11419 11580 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Credit Bond Index</span> 10000 10190 10090 11400 12209 12486 10684 10774 11742 12203 12444 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10049 9944 10955 11665 11655 10313 10189 10933 11276 11489 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class C  (incl. contingent deferred sales charge) -0.32% -1.23% 1.48% Class C 0.66% -1.23% 1.48% Bloomberg U.S. Credit Bond Index 1.98% -0.07% 2.21% Bloomberg U.S. Aggregate Bond Index 1.89% -0.29% 1.40%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. -0.0032 -0.0123 0.0148 0.0066 -0.0123 0.0148 0.0198 -0.0007 0.0221 0.0189 -0.0029 0.0140 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,910,388,376</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">597</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>7,091,502</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">46<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1910388376 597 7091502 0.46   U.S. Government and U.S. Government Agency Obligations 3.4 AAA 0.3 AA 3.7 A 26.5 BBB 58.0 BB 4.6 B 1.0 Not Rated 0.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 3.4   AAA - 0.3                                  AA - 3.7                                   A - 26.5                                   BBB - 58.0                                 BB - 4.6                                   B - 1.0                                    Not Rated - 0.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 91.1 U.S. Treasury Obligations 3.4 Asset-Backed Securities 1.9 CMOs and Other Mortgage Related Securities 0.8 Foreign Government and Government Agency Obligations 0.5 Preferred Securities 0.3 Other Investments 0.1 Municipal Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 91.1                     U.S. Treasury Obligations - 3.4            Asset-Backed Securities - 1.9              CMOs and Other Mortgage Related Securities - 0.8   Foreign Government and Government Agency Obligations - 0.5   Preferred Securities - 0.3                 Other Investments - 0.1                    Municipal Securities - 0.0                 Short-Term Investments and Net Other Assets (Liabilities) - 1.9   United States 83.4 United Kingdom 3.1 Canada 2.8 Ireland 2.5 Germany 1.5 Australia 1.2 Japan 1.0 France 0.8 Spain 0.8 Others 2.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 83.4                       United Kingdom - 3.1                       Canada - 2.8                               Ireland - 2.5                              Germany - 1.5                              Australia - 1.2                            Japan - 1.0                                France - 0.8                               Spain - 0.8                                Others - 2.9                                   0.034 0.003 0.037 0.265 0.580 0.046 0.010 0.006 0.019 0.911 0.034 0.019 0.008 0.005 0.003 0.001 0.000 0.019 0.834 0.031 0.028 0.025 0.015 0.012 0.010 0.008 0.008 0.029 TOP HOLDINGS(% of Fund's net assets)     US Treasury Bonds 3.4   JPMorgan Chase & Co 2.4   Morgan Stanley 2.2   Oracle Corp 2.1   Bank of America Corp 1.9   Broadcom Inc 1.6   Wells Fargo & Co 1.6   Duke Energy Corp 1.3   Meta Platforms Inc 1.2   AerCap Ireland Capital DAC / AerCap Global Aviation Trust 1.1     18.8   0.034 0.024 0.022 0.021 0.019 0.016 0.016 0.013 0.012 0.011 2026-08-31 Fidelity® Corporate Bond Fund Fidelity Advisor® Corporate Bond Fund Class M FCBTX This annual shareholder report contains information about Fidelity® Corporate Bond Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Class M</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>80<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.80<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 80 0.0080 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds achieved a gain for the 12 months ending August 31, 2026, buoyed by three policy interest-rate cuts by the Federal Reserve in late 2025, but pulled down since then by rising bond yields amid higher consumer inflation, a resilient economy and heavy U.S. Treasury issuance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, security selection contributed to the fund's performance versus the benchmark Bloomberg U.S. Credit Bond Index for the fiscal year, whereas sector positioning slightly detracted.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Bond picks among companies in the financials and industrials sectors contributed roughly equally this year. Within financials, broadly diversified exposure to banks and insurance companies, along with holdings of real estate investment trusts, helped the most. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Within industrials, companies in consumer-related industries added the most value. In consumer non-cyclicals, pharmaceutical company Bayer was a notable standout. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Outside of corporate credit, an allocation to U.S. Treasurys and cash - held for liquidity and risk-management purposes - meaningfully dampened the fund's relative result. Underweighting sovereign bonds was another modest detractor. These negatives were somewhat offset by steering clear of other government-related categories, as these bonds lagged credit amid extensive government borrowing, persistent inflation and rising yields. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>During the period, the fund's managers continued to emphasize issuers rated BBB, as they believe there is opportunity for alpha potential over time resulting from improving credit quality. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Noteworthy positioning changes included increasing the allocation to technology issuers, mainly by adding AI-linked companies, such as Nvidia, Alphabet, Meta Platforms and Oracle. Additionally, the fund increased its exposure to finance companies, primarily aircraft lessors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As of August 31, the fund maintained overweight allocations in financial institutions and utilities, and underweight exposure to industrials.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As the fund's managers continued to put capital to work in the corporate market, the portfolio's combined allocation to Treasurys and cash was significantly reduced during the period, from roughly 12% at the beginning to about 4% at the end.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2016 through August 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class M $9,600 $9,825 $9,722 $10,950 $11,796 $12,057 $10,146 $10,212 $11,181 $11,584 $11,745 Bloomberg U.S. Credit Bond Index $10,000 $10,190 $10,090 $11,400 $12,209 $12,486 $10,684 $10,774 $11,742 $12,203 $12,444 Bloomberg U.S. Aggregate Bond Index $10,000 $10,049 $9,944 $10,955 $11,665 $11,655 $10,313 $10,189 $10,933 $11,276 $11,489   2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M</span> 9600 9825 9722 10950 11796 12057 10146 10212 11181 11584 11745 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Credit Bond Index</span> 10000 10190 10090 11400 12209 12486 10684 10774 11742 12203 12444 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10049 9944 10955 11665 11655 10313 10189 10933 11276 11489 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class M (incl. 4.00% sales charge)   -2.67% -1.33% 1.62% Class M (without 4.00% sales charge) 1.39% -0.52% 2.04% Bloomberg U.S. Credit Bond Index 1.98% -0.07% 2.21% Bloomberg U.S. Aggregate Bond Index 1.89% -0.29% 1.40%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. -0.0267 -0.0133 0.0162 0.0139 -0.0052 0.0204 0.0198 -0.0007 0.0221 0.0189 -0.0029 0.0140 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,910,388,376</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">597</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>7,091,502</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">46<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1910388376 597 7091502 0.46   U.S. Government and U.S. Government Agency Obligations 3.4 AAA 0.3 AA 3.7 A 26.5 BBB 58.0 BB 4.6 B 1.0 Not Rated 0.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 3.4   AAA - 0.3                                  AA - 3.7                                   A - 26.5                                   BBB - 58.0                                 BB - 4.6                                   B - 1.0                                    Not Rated - 0.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 91.1 U.S. Treasury Obligations 3.4 Asset-Backed Securities 1.9 CMOs and Other Mortgage Related Securities 0.8 Foreign Government and Government Agency Obligations 0.5 Preferred Securities 0.3 Other Investments 0.1 Municipal Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 91.1                     U.S. Treasury Obligations - 3.4            Asset-Backed Securities - 1.9              CMOs and Other Mortgage Related Securities - 0.8   Foreign Government and Government Agency Obligations - 0.5   Preferred Securities - 0.3                 Other Investments - 0.1                    Municipal Securities - 0.0                 Short-Term Investments and Net Other Assets (Liabilities) - 1.9   United States 83.4 United Kingdom 3.1 Canada 2.8 Ireland 2.5 Germany 1.5 Australia 1.2 Japan 1.0 France 0.8 Spain 0.8 Others 2.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 83.4                       United Kingdom - 3.1                       Canada - 2.8                               Ireland - 2.5                              Germany - 1.5                              Australia - 1.2                            Japan - 1.0                                France - 0.8                               Spain - 0.8                                Others - 2.9                                   0.034 0.003 0.037 0.265 0.580 0.046 0.010 0.006 0.019 0.911 0.034 0.019 0.008 0.005 0.003 0.001 0.000 0.019 0.834 0.031 0.028 0.025 0.015 0.012 0.010 0.008 0.008 0.029 TOP HOLDINGS(% of Fund's net assets)     US Treasury Bonds 3.4   JPMorgan Chase & Co 2.4   Morgan Stanley 2.2   Oracle Corp 2.1   Bank of America Corp 1.9   Broadcom Inc 1.6   Wells Fargo & Co 1.6   Duke Energy Corp 1.3   Meta Platforms Inc 1.2   AerCap Ireland Capital DAC / AerCap Global Aviation Trust 1.1     18.8   0.034 0.024 0.022 0.021 0.019 0.016 0.016 0.013 0.012 0.011 2026-08-31 This report describes changes to the Fund that occurred during the reporting period. Fidelity® U.S. Bond Index Fund Fidelity® U.S. Bond Index Fund FXNAX This annual shareholder report contains information about Fidelity® U.S. Bond Index Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-800-544-8544 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® U.S. Bond Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>3<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.03<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 3 0.0003 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds achieved a gain for the 12 months ending August 31, 2026, buoyed by three policy interest-rate cuts by the Federal Reserve in late 2025, but pulled down since then by rising bond yields amid higher consumer inflation, a resilient economy and heavy U.S. Treasury issuance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>We construct the portfolio using optimization. This approach minimizes the differences between risk exposures of the fund relative to the index. We attempt to hold all positions held by the index in the same relative proportions.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Exposures include duration, key-rate durations, sector, and other factors,</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2016 through August 31, 2026. Initial investment of $10,000. Fidelity® U.S. Bond Index Fund $10,000 $10,039 $9,917 $10,941 $11,649 $11,629 $10,289 $10,169 $10,903 $11,241 $11,459 Bloomberg U.S. Aggregate Bond Index $10,000 $10,049 $9,944 $10,955 $11,665 $11,655 $10,313 $10,189 $10,933 $11,276 $11,489   2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® U.S. Bond Index Fund</span> 10000 10039 9917 10941 11649 11629 10289 10169 10903 11241 11459 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10049 9944 10955 11665 11655 10313 10189 10933 11276 11489 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Fidelity® U.S. Bond Index Fund 1.94% -0.29% 1.37% Bloomberg U.S. Aggregate Bond Index 1.89% -0.29% 1.40%     Visit www.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0194 -0.0029 0.0137 0.0189 -0.0029 0.0140 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>69,780,352,965</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">10,619</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>17,011,407</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">48<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 69780352965 10619 17011407 0.48   U.S. Government and U.S. Government Agency Obligations 70.1 AAA 2.2 AA 3.6 A 13.5 BBB 9.7 BB 0.3 Not Rated 0.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 70.1   AAA - 2.2                                  AA - 3.6                                   A - 13.5                                   BBB - 9.7                                  BB - 0.3                                   Not Rated - 0.9                          Short-Term Investments and Net Other Assets (Liabilities) - (0.3)%   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 46.4 Corporate Bonds 26.3 U.S. Government Agency - Mortgage Securities 23.5 CMOs and Other Mortgage Related Securities 1.5 Foreign Government and Government Agency Obligations 1.3 Asset-Backed Securities 0.6 Municipal Securities 0.4 U.S. Government Agency Obligations 0.2 Other Investments 0.1 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 46.4           Corporate Bonds - 26.3                     U.S. Government Agency - Mortgage Securities - 23.5   CMOs and Other Mortgage Related Securities - 1.5   Foreign Government and Government Agency Obligations - 1.3   Asset-Backed Securities - 0.6              Municipal Securities - 0.4                 U.S. Government Agency Obligations - 0.2   Other Investments - 0.1                  Short-Term Investments and Net Other Assets (Liabilities) - (0.3)%   United States 94.5 Canada 1.1 United Kingdom 0.9 Japan 0.6 Multi-national 0.4 Mexico 0.4 Germany 0.2 Australia 0.2 Spain 0.2 Others 1.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 94.5                       Canada - 1.1                               United Kingdom - 0.9                       Japan - 0.6                                Multi-national - 0.4                       Mexico - 0.4                               Germany - 0.2                              Australia - 0.2                            Spain - 0.2                                Others - 1.5                                   0.701 0.022 0.036 0.135 0.097 0.003 0.009 0.464 0.263 0.235 0.015 0.013 0.006 0.004 0.002 0.001 0.945 0.011 0.009 0.006 0.004 0.004 0.002 0.002 0.002 0.015 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 37.3   Fannie Mae Mortgage pass-thru certificates 9.3   US Treasury Bonds 9.1   Freddie Mac Gold Pool 7.6   Ginnie Mae II Pool 4.5   Ginnie Mae I Pool 1.2   Freddie Mac Multifamily Structured pass-thru certificates 0.9   JPMorgan Chase & Co 0.7   Bank of America Corp 0.7   Uniform Mortgage Backed Securities 0.6     71.9   0.373 0.093 0.091 0.076 0.045 0.012 0.009 0.007 0.007 0.006 <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by October 30, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span></div> <div style="text-align:left;text-align-last:auto;"></div> <span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:</span></div> <ul style="color:#000000;list-style-type:disc;margin:0px 0px 0px 25px;padding:0px;"><li style="margin:5px 0px 2px 24px;padding:0px 0px 0px 0px;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Management fee</span></li><li style="margin:5px 0px 2px 24px;padding:0px 0px 0px 0px;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Operating expenses</span></li></ul> <span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by October 30, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:</span></div> <ul style="color:#000000;list-style-type:disc;margin:0px 0px 0px 25px;padding:0px;"><li style="margin:5px 0px 2px 24px;padding:0px 0px 0px 0px;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Management fee</span></li><li style="margin:5px 0px 2px 24px;padding:0px 0px 0px 0px;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Operating expenses</span></li></ul> <span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 2026-08-31 Fidelity® Corporate Bond Fund Fidelity Advisor® Corporate Bond Fund Class Z FIKOX This annual shareholder report contains information about Fidelity® Corporate Bond Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>36<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.36<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 36 0.0036 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds achieved a gain for the 12 months ending August 31, 2026, buoyed by three policy interest-rate cuts by the Federal Reserve in late 2025, but pulled down since then by rising bond yields amid higher consumer inflation, a resilient economy and heavy U.S. Treasury issuance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, security selection contributed to the fund's performance versus the benchmark Bloomberg U.S. Credit Bond Index for the fiscal year, whereas sector positioning slightly detracted.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Bond picks among companies in the financials and industrials sectors contributed roughly equally this year. Within financials, broadly diversified exposure to banks and insurance companies, along with holdings of real estate investment trusts, helped the most. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Within industrials, companies in consumer-related industries added the most value. In consumer non-cyclicals, pharmaceutical company Bayer was a notable standout. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Outside of corporate credit, an allocation to U.S. Treasurys and cash - held for liquidity and risk-management purposes - meaningfully dampened the fund's relative result. Underweighting sovereign bonds was another modest detractor. These negatives were somewhat offset by steering clear of other government-related categories, as these bonds lagged credit amid extensive government borrowing, persistent inflation and rising yields. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>During the period, the fund's managers continued to emphasize issuers rated BBB, as they believe there is opportunity for alpha potential over time resulting from improving credit quality. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Noteworthy positioning changes included increasing the allocation to technology issuers, mainly by adding AI-linked companies, such as Nvidia, Alphabet, Meta Platforms and Oracle. Additionally, the fund increased its exposure to finance companies, primarily aircraft lessors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As of August 31, the fund maintained overweight allocations in financial institutions and utilities, and underweight exposure to industrials.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As the fund's managers continued to put capital to work in the corporate market, the portfolio's combined allocation to Treasurys and cash was significantly reduced during the period, from roughly 12% at the beginning to about 4% at the end.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE October 2, 2018 through August 31, 2026. Initial investment of $10,000. Class Z $10,000 $11,334 $12,275 $12,601 $10,652 $10,761 $11,847 $12,329 $12,555 Bloomberg U.S. Credit Bond Index $10,000 $11,331 $12,135 $12,409 $10,618 $10,708 $11,670 $12,128 $12,368 Bloomberg U.S. Aggregate Bond Index $10,000 $11,086 $11,804 $11,794 $10,436 $10,311 $11,064 $11,411 $11,626   2018 2019 2020 2021 2022 2023 2024 2025 2026   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span> 10000 11334 12275 12601 10652 10761 11847 12329 12555 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Credit Bond Index</span> 10000 11331 12135 12409 10618 10708 11670 12128 12368 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 11086 11804 11794 10436 10311 11064 11411 11626 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year Life of Fund A Class Z 1.83% -0.07% 2.92% Bloomberg U.S. Credit Bond Index 1.98% -0.07% 2.72% Bloomberg U.S. Aggregate Bond Index 1.89% -0.29% 1.92% A   From October 2, 2018   Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0183 -0.0007 0.0292 0.0198 -0.0007 0.0272 0.0189 -0.0029 0.0192 2018-10-02 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,910,388,376</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">597</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>7,091,502</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">46<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1910388376 597 7091502 0.46   U.S. Government and U.S. Government Agency Obligations 3.4 AAA 0.3 AA 3.7 A 26.5 BBB 58.0 BB 4.6 B 1.0 Not Rated 0.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 3.4   AAA - 0.3                                  AA - 3.7                                   A - 26.5                                   BBB - 58.0                                 BB - 4.6                                   B - 1.0                                    Not Rated - 0.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 91.1 U.S. Treasury Obligations 3.4 Asset-Backed Securities 1.9 CMOs and Other Mortgage Related Securities 0.8 Foreign Government and Government Agency Obligations 0.5 Preferred Securities 0.3 Other Investments 0.1 Municipal Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 91.1                     U.S. Treasury Obligations - 3.4            Asset-Backed Securities - 1.9              CMOs and Other Mortgage Related Securities - 0.8   Foreign Government and Government Agency Obligations - 0.5   Preferred Securities - 0.3                 Other Investments - 0.1                    Municipal Securities - 0.0                 Short-Term Investments and Net Other Assets (Liabilities) - 1.9   United States 83.4 United Kingdom 3.1 Canada 2.8 Ireland 2.5 Germany 1.5 Australia 1.2 Japan 1.0 France 0.8 Spain 0.8 Others 2.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 83.4                       United Kingdom - 3.1                       Canada - 2.8                               Ireland - 2.5                              Germany - 1.5                              Australia - 1.2                            Japan - 1.0                                France - 0.8                               Spain - 0.8                                Others - 2.9                                   0.034 0.003 0.037 0.265 0.580 0.046 0.010 0.006 0.019 0.911 0.034 0.019 0.008 0.005 0.003 0.001 0.000 0.019 0.834 0.031 0.028 0.025 0.015 0.012 0.010 0.008 0.008 0.029 TOP HOLDINGS(% of Fund's net assets)     US Treasury Bonds 3.4   JPMorgan Chase & Co 2.4   Morgan Stanley 2.2   Oracle Corp 2.1   Bank of America Corp 1.9   Broadcom Inc 1.6   Wells Fargo & Co 1.6   Duke Energy Corp 1.3   Meta Platforms Inc 1.2   AerCap Ireland Capital DAC / AerCap Global Aviation Trust 1.1     18.8   0.034 0.024 0.022 0.021 0.019 0.016 0.016 0.013 0.012 0.011 2026-08-31 This report describes changes to the Fund that occurred during the reporting period. Fidelity® Series Government Money Market Fund Fidelity® Series Government Money Market Fund FGNXX This annual shareholder report contains information about Fidelity® Series Government Money Market Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544. fundresearch.fidelity.com/prospectus/sec 1-800-544-8544 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Government Money Market Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>0<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.00<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than $.50</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than 0.005%</span></div> <span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 0 0.0000 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>2,914,496,089</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">451</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>0</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 2914496089 451 0   EFFECTIVE MATURITY DIVERSIFICATION (% of Fund's net assets)   Days   1-7 45.3   8-30 14.2   31-60 14.7   61-90 6.8   91-180 14.5   >180 3.1             U.S. Treasury Obligations 38.9 Repurchase Agreements 31.5 U.S. Government Agency - Debt 28.2 Net Other Assets (Liabilities) 1.4 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 38.9           Repurchase Agreements - 31.5               U.S. Government Agency - Debt - 28.2       Net Other Assets (Liabilities) - 1.4       0.453 0.142 0.147 0.068 0.145 0.031 0.389 0.315 0.282 0.014 <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by October 30, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span></div> <div style="text-align:left;text-align-last:auto;"></div> <span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment risks during the reporting period.</span></div> <div style="text-align:left;text-align-last:auto;"></div></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by October 30, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment risks during the reporting period.</span></div> <div style="text-align:left;text-align-last:auto;"></div> 2026-08-31 Fidelity® Series Bond Index Fund Fidelity® Series Bond Index Fund FIFZX This annual shareholder report contains information about Fidelity® Series Bond Index Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544. fundresearch.fidelity.com/prospectus/sec 1-800-544-8544 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Bond Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>0<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.00<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than $.50</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than 0.005%</span></div> <span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 0 0.0000 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds achieved a gain for the 12 months ending August 31, 2026, buoyed by three policy interest-rate cuts by the Federal Reserve in late 2025, but pulled down since then by rising bond yields amid higher consumer inflation, a resilient economy and heavy U.S. Treasury issuance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>We construct the portfolio using optimization. This approach minimizes the differences between risk exposures of the fund relative to the index. We attempt to hold all positions held by the index in the same relative proportions.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Exposures include duration, key-rate durations, sector, and other factors.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE April 26, 2019 through August 31, 2026. Initial investment of $10,000. Fidelity® Series Bond Index Fund $10,000 $10,601 $11,282 $11,266 $9,962 $9,850 $10,563 $10,889 Bloomberg U.S. Aggregate Bond Index $10,000 $10,596 $11,282 $11,272 $9,974 $9,855 $10,574 $10,906   2019 2020 2021 2022 2023 2024 2025 2026   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Bond Index Fund</span> 10000 10601 11282 11266 9962 9850 10563 10889 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10596 11282 11272 9974 9855 10574 10906 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year Life of Fund A Fidelity® Series Bond Index Fund 1.94% -0.30% 1.43% Bloomberg U.S. Aggregate Bond Index 1.89% -0.29% 1.44% A   From April 26, 2019   Visit www.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0194 -0.0030 0.0143 0.0189 -0.0029 0.0144 2019-04-26 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>35,506,686,383</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">10,201</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>0</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">59<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 35506686383 10201 0 0.59   U.S. Government and U.S. Government Agency Obligations 69.9 AAA 2.6 AA 3.9 A 13.1 BBB 9.9 BB 0.4 Not Rated 0.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 69.9   AAA - 2.6                                  AA - 3.9                                   A - 13.1                                   BBB - 9.9                                  BB - 0.4                                   Not Rated - 0.6                          Short-Term Investments and Net Other Assets (Liabilities) - (0.4)%   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 46.5 Corporate Bonds 26.8 U.S. Government Agency - Mortgage Securities 23.1 CMOs and Other Mortgage Related Securities 1.4 Foreign Government and Government Agency Obligations 1.3 Asset-Backed Securities 0.6 Municipal Securities 0.3 U.S. Government Agency Obligations 0.3 Other Investments 0.1 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 46.5           Corporate Bonds - 26.8                     U.S. Government Agency - Mortgage Securities - 23.1   CMOs and Other Mortgage Related Securities - 1.4   Foreign Government and Government Agency Obligations - 1.3   Asset-Backed Securities - 0.6              Municipal Securities - 0.3                 U.S. Government Agency Obligations - 0.3   Other Investments - 0.1                  Short-Term Investments and Net Other Assets (Liabilities) - (0.4)%   United States 94.5 Canada 1.2 United Kingdom 0.9 Japan 0.6 Multi-national 0.6 Mexico 0.4 Australia 0.2 Spain 0.2 Germany 0.2 Others 1.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 94.5                       Canada - 1.2                               United Kingdom - 0.9                       Japan - 0.6                                Multi-national - 0.6                       Mexico - 0.4                               Australia - 0.2                            Spain - 0.2                                Germany - 0.2                              Others - 1.2                                   0.699 0.026 0.039 0.131 0.099 0.004 0.006 0.465 0.268 0.231 0.014 0.013 0.006 0.003 0.003 0.001 0.945 0.012 0.009 0.006 0.006 0.004 0.002 0.002 0.002 0.012 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 36.4   US Treasury Bonds 10.1   Fannie Mae Mortgage pass-thru certificates 9.2   Freddie Mac Gold Pool 7.3   Ginnie Mae II Pool 4.4   Ginnie Mae I Pool 1.2   Freddie Mac Multifamily Structured pass-thru certificates 0.8   Uniform Mortgage Backed Securities 0.7   JPMorgan Chase & Co 0.7   Bank of America Corp 0.7     71.5   0.364 0.101 0.092 0.073 0.044 0.012 0.008 0.007 0.007 0.007 2026-08-31 Fidelity® Corporate Bond Fund Fidelity Advisor® Corporate Bond Fund Class A FCBAX This annual shareholder report contains information about Fidelity® Corporate Bond Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Class A</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>78<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.77<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 78 0.0077 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds achieved a gain for the 12 months ending August 31, 2026, buoyed by three policy interest-rate cuts by the Federal Reserve in late 2025, but pulled down since then by rising bond yields amid higher consumer inflation, a resilient economy and heavy U.S. Treasury issuance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, security selection contributed to the fund's performance versus the benchmark Bloomberg U.S. Credit Bond Index for the fiscal year, whereas sector positioning slightly detracted.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Bond picks among companies in the financials and industrials sectors contributed roughly equally this year. Within financials, broadly diversified exposure to banks and insurance companies, along with holdings of real estate investment trusts, helped the most. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Within industrials, companies in consumer-related industries added the most value. In consumer non-cyclicals, pharmaceutical company Bayer was a notable standout. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Outside of corporate credit, an allocation to U.S. Treasurys and cash - held for liquidity and risk-management purposes - meaningfully dampened the fund's relative result. Underweighting sovereign bonds was another modest detractor. These negatives were somewhat offset by steering clear of other government-related categories, as these bonds lagged credit amid extensive government borrowing, persistent inflation and rising yields. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>During the period, the fund's managers continued to emphasize issuers rated BBB, as they believe there is opportunity for alpha potential over time resulting from improving credit quality. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Noteworthy positioning changes included increasing the allocation to technology issuers, mainly by adding AI-linked companies, such as Nvidia, Alphabet, Meta Platforms and Oracle. Additionally, the fund increased its exposure to finance companies, primarily aircraft lessors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As of August 31, the fund maintained overweight allocations in financial institutions and utilities, and underweight exposure to industrials.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As the fund's managers continued to put capital to work in the corporate market, the portfolio's combined allocation to Treasurys and cash was significantly reduced during the period, from roughly 12% at the beginning to about 4% at the end.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2016 through August 31, 2026. Initial investment of $10,000 and the current sales charge was paid. Class A $9,600 $9,833 $9,738 $10,977 $11,831 $12,096 $10,184 $10,255 $11,233 $11,642 $11,807 Bloomberg U.S. Credit Bond Index $10,000 $10,190 $10,090 $11,400 $12,209 $12,486 $10,684 $10,774 $11,742 $12,203 $12,444 Bloomberg U.S. Aggregate Bond Index $10,000 $10,049 $9,944 $10,955 $11,665 $11,655 $10,313 $10,189 $10,933 $11,276 $11,489   2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class A</span> 9600 9833 9738 10977 11831 12096 10184 10255 11233 11642 11807 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Credit Bond Index</span> 10000 10190 10090 11400 12209 12486 10684 10774 11742 12203 12444 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10049 9944 10955 11665 11655 10313 10189 10933 11276 11489 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class A (incl. 4.00% sales charge)   -2.64% -1.29% 1.67% Class A (without 4.00% sales charge) 1.41% -0.48% 2.09% Bloomberg U.S. Credit Bond Index 1.98% -0.07% 2.21% Bloomberg U.S. Aggregate Bond Index 1.89% -0.29% 1.40%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. -0.0264 -0.0129 0.0167 0.0141 -0.0048 0.0209 0.0198 -0.0007 0.0221 0.0189 -0.0029 0.0140 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,910,388,376</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">597</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>7,091,502</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">46<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1910388376 597 7091502 0.46   U.S. Government and U.S. Government Agency Obligations 3.4 AAA 0.3 AA 3.7 A 26.5 BBB 58.0 BB 4.6 B 1.0 Not Rated 0.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 3.4   AAA - 0.3                                  AA - 3.7                                   A - 26.5                                   BBB - 58.0                                 BB - 4.6                                   B - 1.0                                    Not Rated - 0.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 91.1 U.S. Treasury Obligations 3.4 Asset-Backed Securities 1.9 CMOs and Other Mortgage Related Securities 0.8 Foreign Government and Government Agency Obligations 0.5 Preferred Securities 0.3 Other Investments 0.1 Municipal Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 91.1                     U.S. Treasury Obligations - 3.4            Asset-Backed Securities - 1.9              CMOs and Other Mortgage Related Securities - 0.8   Foreign Government and Government Agency Obligations - 0.5   Preferred Securities - 0.3                 Other Investments - 0.1                    Municipal Securities - 0.0                 Short-Term Investments and Net Other Assets (Liabilities) - 1.9   United States 83.4 United Kingdom 3.1 Canada 2.8 Ireland 2.5 Germany 1.5 Australia 1.2 Japan 1.0 France 0.8 Spain 0.8 Others 2.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 83.4                       United Kingdom - 3.1                       Canada - 2.8                               Ireland - 2.5                              Germany - 1.5                              Australia - 1.2                            Japan - 1.0                                France - 0.8                               Spain - 0.8                                Others - 2.9                                   0.034 0.003 0.037 0.265 0.580 0.046 0.010 0.006 0.019 0.911 0.034 0.019 0.008 0.005 0.003 0.001 0.000 0.019 0.834 0.031 0.028 0.025 0.015 0.012 0.010 0.008 0.008 0.029 TOP HOLDINGS(% of Fund's net assets)     US Treasury Bonds 3.4   JPMorgan Chase & Co 2.4   Morgan Stanley 2.2   Oracle Corp 2.1   Bank of America Corp 1.9   Broadcom Inc 1.6   Wells Fargo & Co 1.6   Duke Energy Corp 1.3   Meta Platforms Inc 1.2   AerCap Ireland Capital DAC / AerCap Global Aviation Trust 1.1     18.8   0.034 0.024 0.022 0.021 0.019 0.016 0.016 0.013 0.012 0.011 2026-08-31 Fidelity® Series Investment Grade Bond Fund Fidelity® Series Investment Grade Bond Fund FSIGX This annual shareholder report contains information about Fidelity® Series Investment Grade Bond Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544. fundresearch.fidelity.com/prospectus/sec 1-800-544-8544 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Investment Grade Bond Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>0<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.00<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than $.50</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than 0.005%</span></div> <span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 0 0.0000 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds achieved a gain for the 12 months ending August 31, 2026, buoyed by three policy interest-rate cuts by the Federal Reserve in late 2025, but pulled down since then by rising bond yields amid higher consumer inflation, a resilient economy and heavy U.S. Treasury issuance. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, overweight holdings and investment choices among asset-backed securities and commercial mortgage-backed securities each notably contributed to the fund's performance versus the benchmark Bloomberg U.S. Aggregate Index for the fiscal year.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Among investment-grade corporate bonds, an overweight and security selection among financial institutions added value. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, below-benchmark exposure to the industrial sector within corporates detracted from the fund's relative performance. An underweight in mortgage-backed securities modestly hurt as well. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's yield-curve positioning also was a slight performance drag.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Notable changes over the past 12 months included management's decisions to modestly increase exposure to U.S. Treasurys and investment-grade corporate bonds.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2016 through August 31, 2026. Initial investment of $10,000. Fidelity® Series Investment Grade Bond Fund $10,000 $10,145 $10,099 $11,125 $12,033 $12,282 $10,917 $10,915 $11,820 $12,262 $12,506 Bloomberg U.S. Aggregate Bond Index $10,000 $10,049 $9,944 $10,955 $11,665 $11,655 $10,313 $10,189 $10,933 $11,276 $11,489   2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Investment Grade Bond Fund</span> 10000 10145 10099 11125 12033 12282 10917 10915 11820 12262 12506 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10049 9944 10955 11665 11655 10313 10189 10933 11276 11489 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Fidelity® Series Investment Grade Bond Fund 1.99% 0.36% 2.26% Bloomberg U.S. Aggregate Bond Index 1.89% -0.29% 1.40%     Visit www.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0199 0.0036 0.0226 0.0189 -0.0029 0.0140 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>38,088,179,926</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">5,139</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>0</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">169<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 38088179926 5139 0 1.69   U.S. Government and U.S. Government Agency Obligations 63.7 AAA 5.4 AA 0.9 A 7.5 BBB 14.6 BB 2.0 B 0.8 CCC,CC,C 0.1 Not Rated 7.5 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 63.7   AAA - 5.4                                  AA - 0.9                                   A - 7.5                                    BBB - 14.6                                 BB - 2.0                                   B - 0.8                                    CCC,CC,C - 0.1                             Not Rated - 7.5                          Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 48.3 Corporate Bonds 22.7 U.S. Government Agency - Mortgage Securities 15.4 Asset-Backed Securities 8.4 CMOs and Other Mortgage Related Securities 7.4 Other Investments 0.2 Foreign Government and Government Agency Obligations 0.1 Options 0.0 Preferred Securities 0.0 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 48.3           Corporate Bonds - 22.7                     U.S. Government Agency - Mortgage Securities - 15.4   Asset-Backed Securities - 8.4              CMOs and Other Mortgage Related Securities - 7.4   Other Investments - 0.2                    Foreign Government and Government Agency Obligations - 0.1   Options - 0.0                              Preferred Securities - 0.0               Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   United States 90.6 Grand Cayman (UK Overseas Ter) 4.6 United Kingdom 1.0 Mexico 0.7 Bailiwick Of Jersey 0.7 Ireland 0.6 Germany 0.3 Japan 0.3 Switzerland 0.2 Others 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 90.6                       Grand Cayman (UK Overseas Ter) - 4.6       United Kingdom - 1.0                       Mexico - 0.7                               Bailiwick Of Jersey - 0.7                  Ireland - 0.6                              Germany - 0.3                              Japan - 0.3                                Switzerland - 0.2                          Others - 1.0                                   0.637 0.054 0.009 0.075 0.146 0.020 0.008 0.001 0.075 0.483 0.227 0.154 0.084 0.074 0.002 0.001 0.000 0.000 0.906 0.046 0.010 0.007 0.007 0.006 0.003 0.003 0.002 0.010 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 37.5   US Treasury Bonds 10.8   Fannie Mae Mortgage pass-thru certificates 5.1   Freddie Mac Gold Pool 3.8   Ginnie Mae II Pool 3.2   Uniform Mortgage Backed Securities 2.4   Freddie Mac Multifamily Structured pass-thru certificates 1.7   JPMorgan Chase & Co 1.1   Bank of America Corp 0.9   Morgan Stanley 0.9     67.4   0.375 0.108 0.051 0.038 0.032 0.024 0.017 0.011 0.009 0.009 2026-08-31 Fidelity® Corporate Bond Fund Fidelity® Corporate Bond Fund FCBFX This annual shareholder report contains information about Fidelity® Corporate Bond Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-800-544-8544 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Corporate Bond Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>45<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.45<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 45 0.0045 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds achieved a gain for the 12 months ending August 31, 2026, buoyed by three policy interest-rate cuts by the Federal Reserve in late 2025, but pulled down since then by rising bond yields amid higher consumer inflation, a resilient economy and heavy U.S. Treasury issuance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, security selection contributed to the fund's performance versus the benchmark Bloomberg U.S. Credit Bond Index for the fiscal year, whereas sector positioning slightly detracted.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Bond picks among companies in the financials and industrials sectors contributed roughly equally this year. Within financials, broadly diversified exposure to banks and insurance companies, along with holdings of real estate investment trusts, helped the most. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Within industrials, companies in consumer-related industries added the most value. In consumer non-cyclicals, pharmaceutical company Bayer was a notable standout. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Outside of corporate credit, an allocation to U.S. Treasurys and cash - held for liquidity and risk-management purposes - meaningfully dampened the fund's relative result. Underweighting sovereign bonds was another modest detractor. These negatives were somewhat offset by steering clear of other government-related categories, as these bonds lagged credit amid extensive government borrowing, persistent inflation and rising yields. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>During the period, the fund's managers continued to emphasize issuers rated BBB, as they believe there is opportunity for alpha potential over time resulting from improving credit quality. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Noteworthy positioning changes included increasing the allocation to technology issuers, mainly by adding AI-linked companies, such as Nvidia, Alphabet, Meta Platforms and Oracle. Additionally, the fund increased its exposure to finance companies, primarily aircraft lessors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As of August 31, the fund maintained overweight allocations in financial institutions and utilities, and underweight exposure to industrials.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As the fund's managers continued to put capital to work in the corporate market, the portfolio's combined allocation to Treasurys and cash was significantly reduced during the period, from roughly 12% at the beginning to about 4% at the end.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2016 through August 31, 2026. Initial investment of $10,000. Fidelity® Corporate Bond Fund $10,000 $10,277 $10,212 $11,550 $12,488 $12,808 $10,818 $10,929 $12,010 $12,488 $12,705 Bloomberg U.S. Credit Bond Index $10,000 $10,190 $10,090 $11,400 $12,209 $12,486 $10,684 $10,774 $11,742 $12,203 $12,444 Bloomberg U.S. Aggregate Bond Index $10,000 $10,049 $9,944 $10,955 $11,665 $11,655 $10,313 $10,189 $10,933 $11,276 $11,489   2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Corporate Bond Fund</span> 10000 10277 10212 11550 12488 12808 10818 10929 12010 12488 12705 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Credit Bond Index</span> 10000 10190 10090 11400 12209 12486 10684 10774 11742 12203 12444 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10049 9944 10955 11665 11655 10313 10189 10933 11276 11489 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Fidelity® Corporate Bond Fund 1.74% -0.16% 2.42% Bloomberg U.S. Credit Bond Index 1.98% -0.07% 2.21% Bloomberg U.S. Aggregate Bond Index 1.89% -0.29% 1.40%     Visit www.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0174 -0.0016 0.0242 0.0198 -0.0007 0.0221 0.0189 -0.0029 0.0140 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,910,388,376</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">597</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>7,091,502</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">46<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1910388376 597 7091502 0.46   U.S. Government and U.S. Government Agency Obligations 3.4 AAA 0.3 AA 3.7 A 26.5 BBB 58.0 BB 4.6 B 1.0 Not Rated 0.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 3.4   AAA - 0.3                                  AA - 3.7                                   A - 26.5                                   BBB - 58.0                                 BB - 4.6                                   B - 1.0                                    Not Rated - 0.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 91.1 U.S. Treasury Obligations 3.4 Asset-Backed Securities 1.9 CMOs and Other Mortgage Related Securities 0.8 Foreign Government and Government Agency Obligations 0.5 Preferred Securities 0.3 Other Investments 0.1 Municipal Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 91.1                     U.S. Treasury Obligations - 3.4            Asset-Backed Securities - 1.9              CMOs and Other Mortgage Related Securities - 0.8   Foreign Government and Government Agency Obligations - 0.5   Preferred Securities - 0.3                 Other Investments - 0.1                    Municipal Securities - 0.0                 Short-Term Investments and Net Other Assets (Liabilities) - 1.9   United States 83.4 United Kingdom 3.1 Canada 2.8 Ireland 2.5 Germany 1.5 Australia 1.2 Japan 1.0 France 0.8 Spain 0.8 Others 2.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 83.4                       United Kingdom - 3.1                       Canada - 2.8                               Ireland - 2.5                              Germany - 1.5                              Australia - 1.2                            Japan - 1.0                                France - 0.8                               Spain - 0.8                                Others - 2.9                                   0.034 0.003 0.037 0.265 0.580 0.046 0.010 0.006 0.019 0.911 0.034 0.019 0.008 0.005 0.003 0.001 0.000 0.019 0.834 0.031 0.028 0.025 0.015 0.012 0.010 0.008 0.008 0.029 TOP HOLDINGS(% of Fund's net assets)     US Treasury Bonds 3.4   JPMorgan Chase & Co 2.4   Morgan Stanley 2.2   Oracle Corp 2.1   Bank of America Corp 1.9   Broadcom Inc 1.6   Wells Fargo & Co 1.6   Duke Energy Corp 1.3   Meta Platforms Inc 1.2   AerCap Ireland Capital DAC / AerCap Global Aviation Trust 1.1     18.8   0.034 0.024 0.022 0.021 0.019 0.016 0.016 0.013 0.012 0.011 2026-08-31 This report describes changes to the Fund that occurred during the reporting period. Fidelity® Series Short-Term Credit Fund Fidelity® Series Short-Term Credit Fund FYBTX This annual shareholder report contains information about Fidelity® Series Short-Term Credit Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544. fundresearch.fidelity.com/prospectus/sec 1-800-544-8544 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Short-Term Credit Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>0<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.00<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than $.50</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than 0.005%</span></div> <span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 0 0.0000 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds achieved a gain for the 12 months ending August 31, 2026, buoyed by three policy interest-rate cuts by the Federal Reserve in late 2025, but pulled down since then by rising bond yields amid higher consumer inflation, a resilient economy and heavy U.S. Treasury issuance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, the co-managers' security selection among corporate bonds contributed to performance versus the benchmark Bloomberg U.S. Credit 1-3 Years Bond Index for the fiscal year. Within corporates, debt holdings among financial institutions, especially banks, and industrial firms, particularly in the consumer cyclical and consumer non-cyclical segments, added value.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's non-benchmark exposure to asset-backed securities, including car loan debt and collateralized loan obligations, also meaningfully contributed. An out-of-benchmark allocation to commercial mortgage-backed securities helped as well. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the fund's yield-curve positioning detracted from relative performance. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>At period end, corporate credit made up roughly 75% of fund assets, which was underweight versus the benchmark average of 83%. Exposure to ABS stood at roughly 12% as of August 31, while CMBS comprised about 4%, and U.S. Treasurys approximately 5%, of the portfolio at the close of the fiscal year.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2016 through August 31, 2026. Initial investment of $10,000. Fidelity® Series Short-Term Credit Fund $10,000 $10,119 $10,202 $10,714 $11,180 $11,287 $10,866 $11,196 $12,024 $12,656 $13,071 Bloomberg U.S. Credit 1-3 Years Bond Index $10,000 $10,159 $10,219 $10,739 $11,170 $11,275 $10,840 $11,080 $11,861 $12,479 $12,881 Bloomberg U.S. Aggregate Bond Index $10,000 $10,049 $9,944 $10,955 $11,665 $11,655 $10,313 $10,189 $10,933 $11,276 $11,489   2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Short-Term Credit Fund</span> 10000 10119 10202 10714 11180 11287 10866 11196 12024 12656 13071 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Credit 1-3 Years Bond Index</span> 10000 10159 10219 10739 11170 11275 10840 11080 11861 12479 12881 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10049 9944 10955 11665 11655 10313 10189 10933 11276 11489 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Fidelity® Series Short-Term Credit Fund 3.28% 2.98% 2.71% Bloomberg U.S. Credit 1-3 Years Bond Index 3.22% 2.70% 2.56% Bloomberg U.S. Aggregate Bond Index 1.89% -0.29% 1.40%     Visit www.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0328 0.0298 0.0271 0.0322 0.0270 0.0256 0.0189 -0.0029 0.0140 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>348,653,516</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">441</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>0</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">76<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 348653516 441 0 0.76   U.S. Government and U.S. Government Agency Obligations 6.1 AAA 9.8 AA 1.0 A 34.6 BBB 37.7 BB 3.1 Not Rated 6.9 Short-Term Investments and Net Other Assets (Liabilities) 0.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.1   AAA - 9.8                                  AA - 1.0                                   A - 34.6                                   BBB - 37.7                                 BB - 3.1                                   Not Rated - 6.9                            Short-Term Investments and Net Other Assets (Liabilities) - 0.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 75.1 Asset-Backed Securities 12.4 CMOs and Other Mortgage Related Securities 5.3 U.S. Treasury Obligations 5.2 U.S. Government Agency - Mortgage Securities 0.9 Other Investments 0.3 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 75.1                     Asset-Backed Securities - 12.4             CMOs and Other Mortgage Related Securities - 5.3   U.S. Treasury Obligations - 5.2            U.S. Government Agency - Mortgage Securities - 0.9   Other Investments - 0.3                    Short-Term Investments and Net Other Assets (Liabilities) - 0.8   United States 74.7 United Kingdom 5.9 Grand Cayman (UK Overseas Ter) 4.1 Germany 3.2 Japan 2.3 Canada 1.9 Ireland 1.8 Bailiwick Of Jersey 1.5 Netherlands 1.4 Others 3.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 74.7                       United Kingdom - 5.9                       Grand Cayman (UK Overseas Ter) - 4.1       Germany - 3.2                              Japan - 2.3                                Canada - 1.9                               Ireland - 1.8                              Bailiwick Of Jersey - 1.5                  Netherlands - 1.4                          Others - 3.2                                   0.061 0.098 0.010 0.346 0.377 0.031 0.069 0.008 0.751 0.124 0.053 0.052 0.009 0.003 0.008 0.747 0.059 0.041 0.032 0.023 0.019 0.018 0.015 0.014 0.032 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 5.2   Bank of America Corp 3.9   JPMorgan Chase & Co 2.7   Wells Fargo & Co 2.5   Morgan Stanley 2.3   Citigroup Inc 2.0   Goldman Sachs Group Inc/The 1.9   General Motors Financial Co Inc 1.6   Ford Motor Credit Co LLC 1.6   Barclays PLC 1.4     25.1   0.052 0.039 0.027 0.025 0.023 0.020 0.019 0.016 0.016 0.014 <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by October 30, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span></div> <div style="text-align:left;text-align-last:auto;"></div> <span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span></div> <div style="text-align:left;text-align-last:auto;"></div></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by October 30, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span></div> <div style="text-align:left;text-align-last:auto;"></div> 2026-08-31 Fidelity Flex® U.S. Bond Index Fund Fidelity Flex® U.S. Bond Index Fund FIBUX This annual shareholder report contains information about Fidelity Flex® U.S. Bond Index Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-800-544-3455 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® U.S. Bond Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>0<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.00<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than $.50</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than 0.005%</span></div> <span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 0 0.0000 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds achieved a gain for the 12 months ending August 31, 2026, buoyed by three policy interest-rate cuts by the Federal Reserve in late 2025, but pulled down since then by rising bond yields amid higher consumer inflation, a resilient economy and heavy U.S. Treasury issuance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>We construct the portfolio using optimization. This approach minimizes the differences between risk exposures of the fund relative to the index. We attempt to hold all positions held by the index in the same relative proportions.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Exposures include duration, key-rate durations, sector, and other factors.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE March 9, 2017 through August 31, 2026. Initial investment of $10,000. Fidelity Flex® U.S. Bond Index Fund $10,000 $10,399 $10,283 $11,340 $12,077 $12,042 $10,659 $10,528 $11,287 $11,641 Bloomberg U.S. Aggregate Bond Index $10,000 $10,410 $10,300 $11,348 $12,083 $12,073 $10,682 $10,555 $11,325 $11,680   2017 2018 2019 2020 2021 2022 2023 2024 2025 2026   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® U.S. Bond Index Fund</span> 10000 10399 10283 11340 12077 12042 10659 10528 11287 11641 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10410 10300 11348 12083 12073 10682 10555 11325 11680 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year Life of Fund A Fidelity Flex® U.S. Bond Index Fund 1.92% -0.30% 1.82% Bloomberg U.S. Aggregate Bond Index 1.89% -0.29% 1.85% A   From March 9, 2017   Visit www.401k.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0192 -0.0030 0.0182 0.0189 -0.0029 0.0185 2017-03-09 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.401k.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>4,295,922,500</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">6,017</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>0</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">69<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 4295922500 6017 0 0.69   U.S. Government and U.S. Government Agency Obligations 70.4 AAA 2.3 AA 3.9 A 13.6 BBB 9.4 BB 0.4 Not Rated 0.5 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 70.4   AAA - 2.3                                  AA - 3.9                                   A - 13.6                                   BBB - 9.4                                  BB - 0.4                                   Not Rated - 0.5                          Short-Term Investments and Net Other Assets (Liabilities) - (0.5)%   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 47.2 Corporate Bonds 26.8 U.S. Government Agency - Mortgage Securities 22.9 CMOs and Other Mortgage Related Securities 1.3 Foreign Government and Government Agency Obligations 1.2 Asset-Backed Securities 0.5 U.S. Government Agency Obligations 0.3 Municipal Securities 0.2 Other Investments 0.1 Preferred Securities 0.0 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 47.2           Corporate Bonds - 26.8                     U.S. Government Agency - Mortgage Securities - 22.9   CMOs and Other Mortgage Related Securities - 1.3   Foreign Government and Government Agency Obligations - 1.2   Asset-Backed Securities - 0.5              U.S. Government Agency Obligations - 0.3   Municipal Securities - 0.2                 Other Investments - 0.1                    Preferred Securities - 0.0               Short-Term Investments and Net Other Assets (Liabilities) - (0.5)%   United States 94.5 Canada 1.1 United Kingdom 1.0 Japan 0.6 Multi-national 0.6 Mexico 0.3 Australia 0.2 Spain 0.2 Belgium 0.2 Others 1.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 94.5                       Canada - 1.1                               United Kingdom - 1.0                       Japan - 0.6                                Multi-national - 0.6                       Mexico - 0.3                               Australia - 0.2                            Spain - 0.2                                Belgium - 0.2                              Others - 1.3                                   0.704 0.023 0.039 0.136 0.094 0.004 0.005 0.472 0.268 0.229 0.013 0.012 0.005 0.003 0.002 0.001 0.000 0.945 0.011 0.010 0.006 0.006 0.003 0.002 0.002 0.002 0.013 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 36.9   US Treasury Bonds 10.3   Fannie Mae Mortgage pass-thru certificates 9.0   Freddie Mac Gold Pool 6.9   Ginnie Mae II Pool 4.2   Ginnie Mae I Pool 1.3   Uniform Mortgage Backed Securities 1.1   Freddie Mac Multifamily Structured pass-thru certificates 0.7   JPMorgan Chase & Co 0.7   Morgan Stanley 0.6     71.7   0.369 0.103 0.090 0.069 0.042 0.013 0.011 0.007 0.007 0.006 2026-08-31 Fidelity® Corporate Bond Fund Fidelity Advisor® Corporate Bond Fund Class I FCBIX This annual shareholder report contains information about Fidelity® Corporate Bond Fund for the period September 1, 2025 to August 31, 2026. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Class I</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>50<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.49<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 50 0.0049 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds achieved a gain for the 12 months ending August 31, 2026, buoyed by three policy interest-rate cuts by the Federal Reserve in late 2025, but pulled down since then by rising bond yields amid higher consumer inflation, a resilient economy and heavy U.S. Treasury issuance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, security selection contributed to the fund's performance versus the benchmark Bloomberg U.S. Credit Bond Index for the fiscal year, whereas sector positioning slightly detracted.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Bond picks among companies in the financials and industrials sectors contributed roughly equally this year. Within financials, broadly diversified exposure to banks and insurance companies, along with holdings of real estate investment trusts, helped the most. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Within industrials, companies in consumer-related industries added the most value. In consumer non-cyclicals, pharmaceutical company Bayer was a notable standout. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Outside of corporate credit, an allocation to U.S. Treasurys and cash - held for liquidity and risk-management purposes - meaningfully dampened the fund's relative result. Underweighting sovereign bonds was another modest detractor. These negatives were somewhat offset by steering clear of other government-related categories, as these bonds lagged credit amid extensive government borrowing, persistent inflation and rising yields. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>During the period, the fund's managers continued to emphasize issuers rated BBB, as they believe there is opportunity for alpha potential over time resulting from improving credit quality. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Noteworthy positioning changes included increasing the allocation to technology issuers, mainly by adding AI-linked companies, such as Nvidia, Alphabet, Meta Platforms and Oracle. Additionally, the fund increased its exposure to finance companies, primarily aircraft lessors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As of August 31, the fund maintained overweight allocations in financial institutions and utilities, and underweight exposure to industrials.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>As the fund's managers continued to put capital to work in the corporate market, the portfolio's combined allocation to Treasurys and cash was significantly reduced during the period, from roughly 12% at the beginning to about 4% at the end.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2016 through August 31, 2026. Initial investment of $10,000. Class I $10,000 $10,272 $10,202 $11,534 $12,465 $12,778 $10,787 $10,893 $11,965 $12,434 $12,645 Bloomberg U.S. Credit Bond Index $10,000 $10,190 $10,090 $11,400 $12,209 $12,486 $10,684 $10,774 $11,742 $12,203 $12,444 Bloomberg U.S. Aggregate Bond Index $10,000 $10,049 $9,944 $10,955 $11,665 $11,655 $10,313 $10,189 $10,933 $11,276 $11,489   2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class I</span> 10000 10272 10202 11534 12465 12778 10787 10893 11965 12434 12645 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Credit Bond Index</span> 10000 10190 10090 11400 12209 12486 10684 10774 11742 12203 12444 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10049 9944 10955 11665 11655 10313 10189 10933 11276 11489 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class I 1.69% -0.21% 2.37% Bloomberg U.S. Credit Bond Index 1.98% -0.07% 2.21% Bloomberg U.S. Aggregate Bond Index 1.89% -0.29% 1.40%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0169 -0.0021 0.0237 0.0198 -0.0007 0.0221 0.0189 -0.0029 0.0140 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2026)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,910,388,376</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">597</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>7,091,502</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">46<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1910388376 597 7091502 0.46   U.S. Government and U.S. Government Agency Obligations 3.4 AAA 0.3 AA 3.7 A 26.5 BBB 58.0 BB 4.6 B 1.0 Not Rated 0.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 3.4   AAA - 0.3                                  AA - 3.7                                   A - 26.5                                   BBB - 58.0                                 BB - 4.6                                   B - 1.0                                    Not Rated - 0.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 91.1 U.S. Treasury Obligations 3.4 Asset-Backed Securities 1.9 CMOs and Other Mortgage Related Securities 0.8 Foreign Government and Government Agency Obligations 0.5 Preferred Securities 0.3 Other Investments 0.1 Municipal Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 91.1                     U.S. Treasury Obligations - 3.4            Asset-Backed Securities - 1.9              CMOs and Other Mortgage Related Securities - 0.8   Foreign Government and Government Agency Obligations - 0.5   Preferred Securities - 0.3                 Other Investments - 0.1                    Municipal Securities - 0.0                 Short-Term Investments and Net Other Assets (Liabilities) - 1.9   United States 83.4 United Kingdom 3.1 Canada 2.8 Ireland 2.5 Germany 1.5 Australia 1.2 Japan 1.0 France 0.8 Spain 0.8 Others 2.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 83.4                       United Kingdom - 3.1                       Canada - 2.8                               Ireland - 2.5                              Germany - 1.5                              Australia - 1.2                            Japan - 1.0                                France - 0.8                               Spain - 0.8                                Others - 2.9                                   0.034 0.003 0.037 0.265 0.580 0.046 0.010 0.006 0.019 0.911 0.034 0.019 0.008 0.005 0.003 0.001 0.000 0.019 0.834 0.031 0.028 0.025 0.015 0.012 0.010 0.008 0.008 0.029 TOP HOLDINGS(% of Fund's net assets)     US Treasury Bonds 3.4   JPMorgan Chase & Co 2.4   Morgan Stanley 2.2   Oracle Corp 2.1   Bank of America Corp 1.9   Broadcom Inc 1.6   Wells Fargo & Co 1.6   Duke Energy Corp 1.3   Meta Platforms Inc 1.2   AerCap Ireland Capital DAC / AerCap Global Aviation Trust 1.1     18.8   0.034 0.024 0.022 0.021 0.019 0.016 0.016 0.013 0.012 0.011