<?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>0001696102</rptOwnerCik>
            <rptOwnerName>Wilks Matthew</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>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</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>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1319493</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>26.01</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1477285</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Held by THRC Holdings, LP</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>60000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Held by JCMWZ, LLC</value>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On September 11, 2026, THRC Holdings, LP (&quot;THRC&quot;) acquired from ProFrac GDM, LLC (&quot;ProFrac GDM&quot;), pursuant to a stock transfer agreement (the &quot;Flotek Stock Transfer Agreement&quot;), 1,319,493 shares 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 term loans held by THRC.</footnote>
        <footnote id="F2">Pursuant to the Flotek Stock Transfer Agreement, 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>
        <footnote id="F3">The reporting person, as VP-Investments of THRC may be deemed to exercise voting and investment power over the Common Stock directly owned by THRC, and therefore, may be deemed to beneficially own such shares. THRC directly holds the shares of Common Stock. The reporting person disclaims beneficial ownership of all equity securities reported herein except to the extent of his pecuniary interest therein, and the filing of this Form 4 shall not be construed as an admission that the reporting person is the beneficial owner of any equity securities covered by this Form 4.</footnote>
        <footnote id="F4">The reporting person is the Manager of JCMWZ, LLC. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Steven Scrogham, Attorney-in-Fact</signatureName>
        <signatureDate>2026-09-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
