MFS SERIES TRUST III
    SEC Filings

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    All SEC filings by MFS SERIES TRUST III — annual and quarterly reports, current reports, registrations, proxies and ownership forms, updated in real time.

    Financials

    N-CENAnnual report (registered investment company)Apr 14, 2026
    N-CSRCertified annual shareholder report (management investment company)Mar 30, 2026
    N-CSRSCertified semi-annual shareholder report (management investment company)Sep 25, 2025
    N-CENAnnual report (registered investment company)Apr 11, 2025
    N-CSRCertified annual shareholder report (management investment company)Mar 28, 2025
    N-CSRSCertified semi-annual shareholder report (management investment company)Sep 25, 2024
    N-CENAnnual report (registered investment company)Apr 10, 2024
    N-CSRCertified annual shareholder report (management investment company)Mar 26, 2024
    N-CSRSCertified semi-annual shareholder report (management investment company)Sep 19, 2023
    N-CENAnnual report (registered investment company)Apr 13, 2023

    Events

    No results found.

    Registrations and Prospectuses

    40-APP/AApplication for exemptive order (Investment Company Act)Sep 16, 2011
    AWWithdrawal of amendmentMay 31, 2011
    40-APP/AApplication for exemptive order (Investment Company Act)Jul 22, 2010
    40-APP/AApplication for exemptive order (Investment Company Act)May 7, 2009
    N-14Registration statement for investment companies business combinationApr 9, 2009
    40-APP/AApplication for exemptive order (Investment Company Act)Mar 19, 2009
    40-APP/AApplication for exemptive order (Investment Company Act)Nov 26, 2008
    40-APPApplication for exemptive order (Investment Company Act)Apr 17, 2008
    40-APP/AApplication for exemptive order (Investment Company Act)Jan 12, 2006
    40-APPApplication for exemptive order (Investment Company Act)Sep 15, 2005

    Proxies

    N-PXAnnual report of proxy voting recordAug 26, 2026
    N-PXAnnual report of proxy voting recordAug 28, 2025
    DEFA14AAdditional proxy soliciting materialsSep 30, 2024
    DEF 14ADefinitive proxySep 13, 2024
    N-PXAnnual report of proxy voting recordAug 27, 2024
    N-PXAnnual report of proxy voting recordAug 27, 2024
    N-PXAnnual report of proxy voting recordAug 29, 2023
    N-PXAnnual report of proxy voting recordAug 29, 2022
    N-PXAnnual report of proxy voting recordAug 27, 2021
    N-PXAnnual report of proxy voting recordAug 28, 2020

    Other

    CORRESPCorrespondence with SECAug 19, 2025
    CORRESPCorrespondence with SECApr 6, 2017
    CORRESPCorrespondence with SECApr 26, 2016
    CORRESPCorrespondence with SECMay 27, 2014
    CORRESPCorrespondence with SECJan 21, 2014
    CORRESPCorrespondence with SECSep 7, 2012
    CORRESPCorrespondence with SECMay 14, 2009

    Ownership

    NPORT-PMfs Municipal High Income Fund (apr 2026 Report)Jun 29, 2026
    NPORT-PMfs High Yield Pooled Portfolio (apr 2026 Report)Jun 29, 2026
    NPORT-PMfs High Income Fund (apr 2026 Report)Jun 29, 2026
    NPORT-PMfs Global High Yield Fund (apr 2026 Report)Jun 29, 2026
    NPORT-PMfs Global High Yield Fund (jan 2026 Report)Mar 25, 2026
    NPORT-PMfs Municipal High Income Fund (jan 2026 Report)Mar 25, 2026
    NPORT-PMfs High Yield Pooled Portfolio (jan 2026 Report)Mar 25, 2026
    NPORT-PMfs High Income Fund (jan 2026 Report)Mar 25, 2026
    NPORT-PMfs Municipal High Income Fund (oct 2025 Report)Dec 23, 2025
    NPORT-PMfs High Yield Pooled Portfolio (oct 2025 Report)Dec 23, 2025