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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-04-30</periodOfReport>

    <issuer>
        <issuerCik>0001981546</issuerCik>
        <issuerName>Commercial Bancgroup, Inc.</issuerName>
        <issuerTradingSymbol>CBK</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002087401</rptOwnerCik>
            <rptOwnerName>Metheny Philip J.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O COMMERCIAL BANCGROUP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>6710 CUMBERLAND GAP PARKWAY</rptOwnerStreet2>
            <rptOwnerCity>HARROGATE</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>37752</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>true</isOfficer>
            <officerTitle>EVP, Chief Financial Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-04-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3300</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>29.0182</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12731.69</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $28.950 to $29.025 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.</footnote>
        <footnote id="F2">Includes an award of 1,119 restricted stock units (collectively, the &quot;RSUs&quot; and each, an &quot;RSU&quot;) granted pursuant to the Commercial Bancgroup, Inc. 2025 Omnibus Incentive Plan. Each RSU represents a contingent right to receive one share of the issuer's common stock. The RSUs vest in three equal annual installments on each of January 1, 2027, January 1, 2028 and January 1, 2029.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Philip J. Metheny</signatureName>
        <signatureDate>2026-05-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
