content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <headerData>
  <submissionType>144</submissionType>
  <filerInfo>
  <filer>
  <filerCredentials>
  <cik>0001318864</cik>
  <ccc>XXXXXXXX</ccc>
  </filerCredentials>
  </filer>
  <liveTestFlag>LIVE</liveTestFlag>
  </filerInfo>
  </headerData>
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  <issuerInfo>
  <issuerCik>0001282637</issuerCik>
  <issuerName>NewMarket Corporation</issuerName>
  <secFileNumber>001-32190</secFileNumber>
  <issuerAddress>
  <street1 xmlns="http://www.sec.gov/edgar/common">330 South Fourth Street</street1>
  <city xmlns="http://www.sec.gov/edgar/common">Richmond</city>
  <stateOrCountry xmlns="http://www.sec.gov/edgar/common">VA</stateOrCountry>
  <zipCode xmlns="http://www.sec.gov/edgar/common">23219</zipCode>
  </issuerAddress>
  <issuerContactPhone>804-788-5000</issuerContactPhone>
  <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>HAZELGROVE BRUCE R III</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
  <relationshipsToIssuer>
  <relationshipToIssuer>Officer</relationshipToIssuer>
  </relationshipsToIssuer>
  </issuerInfo>
  <securitiesInformation>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <brokerOrMarketmakerDetails>
  <name>Computershare Trust Company, N.A.</name>
  <address>
  <street1 xmlns="http://www.sec.gov/edgar/common">P.O. Box 43078</street1>
  <city xmlns="http://www.sec.gov/edgar/common">Providence</city>
  <stateOrCountry xmlns="http://www.sec.gov/edgar/common">RI</stateOrCountry>
  <zipCode xmlns="http://www.sec.gov/edgar/common">02940-3078</zipCode>
  </address>
  </brokerOrMarketmakerDetails>
  <noOfUnitsSold>311</noOfUnitsSold>
  <aggregateMarketValue>199796</aggregateMarketValue>
  <noOfUnitsOutstanding>9434506</noOfUnitsOutstanding>
  <approxSaleDate>05/12/2025</approxSaleDate>
  <securitiesExchangeName>NYSE</securitiesExchangeName>
  </securitiesInformation>
  <securitiesToBeSold>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <acquiredDate>02/27/2019</acquiredDate>
  <natureOfAcquisitionTransaction>Performance Stock Award</natureOfAcquisitionTransaction>
  <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
  <isGiftTransaction>N</isGiftTransaction>
  <amountOfSecuritiesAcquired>132</amountOfSecuritiesAcquired>
  <paymentDate>02/27/2019</paymentDate>
  <natureOfPayment>N/A</natureOfPayment>
  </securitiesToBeSold>
  <securitiesToBeSold>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <acquiredDate>02/20/2020</acquiredDate>
  <natureOfAcquisitionTransaction>Performance Stock Award</natureOfAcquisitionTransaction>
  <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
  <isGiftTransaction>N</isGiftTransaction>
  <amountOfSecuritiesAcquired>179</amountOfSecuritiesAcquired>
  <paymentDate>02/20/2020</paymentDate>
  <natureOfPayment>N/A</natureOfPayment>
  </securitiesToBeSold>
  <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
  <noticeSignature>
  <noticeDate>05/13/2025</noticeDate>
  <signature>/s/ Bruce R. Hazelgrove, III</signature>
  </noticeSignature>
  </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 3152}]
text: 144
  0001318864
  XXXXXXXX
  LIVE
  0001282637
  NewMarket Corporation
  001-32190
  330 South Fourth Street
  Richmond
  VA
  23219
  804-788-5000
  HAZELGROVE BRUCE R III
  Officer
  Common Stock
  Computershare Trust Company, N.A.
  P.O. Box 43078
  Providence
  RI
  02940-3078
  311
  199796
  9434506
  05/12/2025
  NYSE
  Common Stock
  02/27/2019
  Performance Stock Award
  Issuer
  N
  132
  02/27/2019
  N/A
  Common Stock
  02/20/2020
  Performance Stock Award
  Issuer
  N
  179
  02/20/2020
  N/A
  Y
  05/13/2025
  /s/ Bruce R. Hazelgrove, III