MIDAMERICAN ENERGY CO
    SEC Filings

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    All SEC filings by MIDAMERICAN ENERGY CO (MWPSP) — annual and quarterly reports, current reports, registrations, proxies and ownership forms, updated in real time.

    Financials

    10-QQuarterly reportView DiffAug 7, 2026
    10-QQuarterly reportView DiffMay 1, 2026
    10-KAnnual reportView DiffFeb 27, 2026
    10-QQuarterly reportView DiffOct 31, 2025
    10-QQuarterly reportView DiffAug 1, 2025
    10-QQuarterly reportView DiffMay 2, 2025
    10-KAnnual reportView DiffFeb 21, 2025
    10-QQuarterly reportView DiffNov 1, 2024
    10-QQuarterly reportView DiffAug 2, 2024
    10-QQuarterly reportView DiffMay 6, 2024

    Events

    8-KRegulation Fd DisclosureMar 26, 2026
    8-KRegulation Fd DisclosureNov 7, 2025
    8-KOther EventsNov 5, 2025
    8-KRegulation Fd DisclosureMar 27, 2025
    8-KRegulation Fd DisclosureNov 8, 2024
    8-KRegulation Fd DisclosureMar 26, 2024
    8-KOther EventsJan 24, 2024
    8-KRegulation Fd DisclosureNov 13, 2023
    8-KOther EventsSep 7, 2023
    8-KRegulation Fd DisclosureMar 30, 2023

    Registrations and Prospectuses

    424B2Prospectus for primary offeringNov 4, 2025
    FWPFree writing prospectusNov 3, 2025
    424B5Prospectus supplement for primary offeringNov 3, 2025
    S-3ASRAutomatic shelf registrationOct 22, 2025
    424B2Prospectus for primary offeringJan 23, 2024
    FWPFree writing prospectusJan 22, 2024
    424B5Prospectus supplement for primary offeringJan 22, 2024
    424B2Prospectus for primary offeringSep 6, 2023
    FWPFree writing prospectusSep 5, 2023
    424B5Prospectus supplement for primary offeringSep 5, 2023

    Proxies

    DFAN14AAdditional proxy materials by non-managementSep 4, 1996
    DFAN14AAdditional proxy materials by non-managementSep 3, 1996
    DFAN14AAdditional proxy materials by non-managementAug 30, 1996
    DFAN14AAdditional proxy materials by non-managementAug 29, 1996
    DFAN14AAdditional proxy materials by non-managementAug 29, 1996
    DFAN14AAdditional proxy materials by non-managementAug 27, 1996
    DFAN14AAdditional proxy materials by non-managementAug 27, 1996
    DFAN14AAdditional proxy materials by non-managementAug 23, 1996
    DFAN14AAdditional proxy materials by non-managementAug 22, 1996
    DFAN14AAdditional proxy materials by non-managementAug 21, 1996

    Other

    EFFECTNotice of effectivenessMar 10, 2023
    IRANNOTICEDisclosure regarding Iran Threat Reduction and Syria Human Rights ActMay 6, 2016
    EFFECTNotice of effectivenessSep 16, 2015
    EFFECTNotice of effectivenessNov 12, 2013
    EFFECTNotice of effectivenessOct 30, 2013
    EFFECTNotice of effectivenessSep 9, 2013
    EFFECTNotice of effectivenessSep 5, 2013
    EFFECTNotice of effectivenessApr 11, 2013
    UPLOADLetter from SECJul 8, 2008
    CORRESPCorrespondence with SECJul 1, 2008

    Ownership

    SC 13GBeneficial ownership reportJan 28, 2000
    SC 13G/ABeneficial ownership reportFeb 11, 1998
    SC 13GBeneficial ownership reportFeb 12, 1997
    SC 13DBeneficial ownership reportDec 15, 1995