<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-07-28</periodOfReport>

    <notSubjectToSection16>true</notSubjectToSection16>

    <issuer>
        <issuerCik>0000915358</issuerCik>
        <issuerName>SIGMATRON INTERNATIONAL INC</issuerName>
        <issuerTradingSymbol>SGMA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001033714</rptOwnerCik>
            <rptOwnerName>PLANTE PAUL J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SIGMATRON INTERNATIONAL INC.</rptOwnerStreet1>
            <rptOwnerStreet2>2201 LANDMEIER RD</rptOwnerStreet2>
            <rptOwnerCity>ELK GROVE VILLAGE</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60007</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-07-28</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>32000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Disposed of pursuant to an Agreement and Plan of Merger (the &quot;Merger Agreement&quot;), dated as of May 20, 2025, by and among SigmaTron International, Inc. (the &quot;Company&quot;), Transom Axis AcquireCo, LLC (&quot;Parent&quot;) and Transom Axis MergerSub, Inc. (&quot;Merger Sub&quot;). Pursuant to the Merger Agreement, Parent and MergerSub launched a tender offer (the &quot;Offer&quot;) for all outstanding shares of common stock of the Company (the &quot;Shares&quot;) for an offer price of $3.02 per share in cash, without interest and less any required tax withholding (the &quot;Offer Consideration&quot;). On July 28, 2025, at the effective time of the Company's merger with and into Merger Sub, the shares held by the reporting person were cancelled and converted into the right to receive the Offer Consideration.</footnote>
    </footnotes>

    <remarks>Exhibit 24.1 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Gary R. Fairhead, as Attorney-in-Fact for Paul J. Plante</signatureName>
        <signatureDate>2025-07-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
