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            <secFileNumber>001-02960</secFileNumber>
            <issuerAddress>
                <ns2:street1>9320 Lakeside Boulevard</ns2:street1>
                <ns2:street2>Suite 100</ns2:street2>
                <ns2:city>The Woodlands</ns2:city>
                <ns2:stateOrCountry>TX</ns2:stateOrCountry>
                <ns2:zipCode>77381</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(281)362-6800</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>MICHAEL LEWIS</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Director</relationshipToIssuer>
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        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>4026</noOfUnitsSold>
            <aggregateMarketValue>33778.14</aggregateMarketValue>
            <noOfUnitsOutstanding>84522676</noOfUnitsOutstanding>
            <approxSaleDate>06/16/2025</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>05/18/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>4026</amountOfSecuritiesAcquired>
            <paymentDate>05/18/2024</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>06/16/2025</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>03/07/2025</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Michael Lewis</signature>
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144
0001423238
XXXXXXXX
LIVE
0000071829
NPK International Inc.
001-02960
9320 Lakeside Boulevard
Suite 100
The Woodlands
TX
77381
(281)362-6800
MICHAEL LEWIS
Director
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
4026
33778.14
84522676
06/16/2025
NYSE
Common
05/18/2024
Restricted Stock Units
Issuer
N
4026
05/18/2024
N/A
Y
06/16/2025
03/07/2025
/s/ Michael Lewis