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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2014-04-07</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001376339</issuerCik>
        <issuerName>MIMEDX GROUP, INC.</issuerName>
        <issuerTradingSymbol>MDXG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000901434</rptOwnerCik>
            <rptOwnerName>PETIT PARKER H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MIMEDX GROUP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1775 WEST OAK COMMONS CT., NE</rptOwnerStreet2>
            <rptOwnerCity>MARIETTA</rptOwnerCity>
            <rptOwnerState>GA</rptOwnerState>
            <rptOwnerZipCode>30062</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman &amp; CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-04-07</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>150000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5834884</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">As Trustee of The Parker H. Petit Grantor Trust, Mr. Petit was deemed to be the beneficial owner of the shares held by the Trust.  The Trust was established in October 1995.  The beneficiaries of the Trust are Mr. Petit's adult children.  On April 7, 2014, all shares were distributed to the beneficiaries in accordance with the terms of the Trust.</footnote>
        <footnote id="F2">Number of shares held directly by Mr. Petit, including 163,037 shares of Restricted Stock, which vest in equal installments over first three anniversary dates of the grants.  Mr. Petit also beneficially owns 150,000 shares held by Petit Investments LP, of which he serves as General partner and limited partner and possesses shared voting and investment control; and 1,250,000 shares held by Cox Road Partners II LLP, 1,250,000 shares held by Cox Road Partners LLLP and 1,250,000 shares held by Petit Investments LLLP II, Limited Liability Partnerships, over which Mr. Petit possesses sole voting and investment control.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Michael J. Senken, by Power of Attorney</signatureName>
        <signatureDate>2014-04-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
