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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-09-11</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000928054</issuerCik>
        <issuerName>FLOTEK INDUSTRIES INC/CN/</issuerName>
        <issuerTradingSymbol>FTK</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002067153</rptOwnerCik>
            <rptOwnerName>ProFrac GDM, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>333 SHOPS BLVD</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 301</rptOwnerStreet2>
            <rptOwnerCity>WILLOW PARK</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>76087</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-09-11</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2306806</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>26.01</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3693194</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On September 11, 2026, ProFrac GDM, LLC (&quot;ProFrac GDM&quot;) sold to THRC Holdings, LP (&quot;THRC&quot;) and Farris Wilks, pursuant to stock transfer agreements (the &quot;Flotek Stock Transfer Agreements&quot;), 1,319,493 shares and 987,313 shares, respectively, of common stock, par value $0.0001 per share (&quot;Common Stock&quot;), of Flotek Industries, Inc., in exchange for the cancellation of $34,320,000 of Alpine Holding II, LLC (&quot;Alpine&quot;) term loans held by THRC and $25,680,000 of Alpine term loans held by Farris Wilks.</footnote>
        <footnote id="F2">Pursuant to the Flotek Stock Transfer Agreements, the price per share of $26.01 was determined by using the volume-weighted average price of the Common Stock reported on the New York Stock Exchange for the five consecutive trading days ending on (and including) the trading day immediately preceding September 11, 2026.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Steven Scrogham, Corporate Secretary of ProFrac GDM, LLC</signatureName>
        <signatureDate>2026-09-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
