content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <!-- Generated by Workiva -->
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001568817</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000949157</issuerCik>
        <issuerName>Century Aluminum Company</issuerName>
        <secFileNumber>001-34474</secFileNumber>
        <issuerAddress>
          <com:street1>One South Wacker Drive, Suite 1000</com:street1>
          <com:city>Chicago</com:city>
          <com:stateOrCountry>IL</com:stateOrCountry>
          <com:zipCode>60093</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>312-696-3101</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Jesse E. Gary</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Affiliate</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>J.P. Morgan Securities LLC</name>
          <address>
            <com:street1>390 Madison Avenue - 6th Floor</com:street1>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10017</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>79243</noOfUnitsSold>
        <aggregateMarketValue>1506409.43</aggregateMarketValue>
        <noOfUnitsOutstanding>92798844</noOfUnitsOutstanding>
        <approxSaleDate>12/26/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>12/31/2015</acquiredDate>
        <natureOfAcquisitionTransaction>Compensation</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1627</amountOfSecuritiesAcquired>
        <paymentDate>12/31/2015</paymentDate>
        <natureOfPayment>N/A</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>03/24/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Compensation</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>30190</amountOfSecuritiesAcquired>
        <paymentDate>03/24/2020</paymentDate>
        <natureOfPayment>N/A</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>07/01/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Compensation</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>29877</amountOfSecuritiesAcquired>
        <paymentDate>07/01/2022</paymentDate>
        <natureOfPayment>N/A</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>07/01/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Compensation</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>17549</amountOfSecuritiesAcquired>
        <paymentDate>07/01/2024</paymentDate>
        <natureOfPayment>N/A</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <remarks>The shares filed today will be sold by the Jesse E. Gary Revocable Trust, Jesse E. Gary as Trustee</remarks>
      <noticeSignature>
        <noticeDate>12/26/2024</noticeDate>
        <signature>/s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for Jesse E. Gary</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4526}]
text: 144
  0001568817
  XXXXXXXX
  LIVE
  0000949157
  Century Aluminum Company
  001-34474
  One South Wacker Drive, Suite 1000
  Chicago
  IL
  60093
  312-696-3101
  Jesse E. Gary
  Affiliate
  Common Stock
  J.P. Morgan Securities LLC
  390 Madison Avenue - 6th Floor
  New York
  NY
  10017
  79243
  1506409.43
  92798844
  12/26/2024
  NASDAQ
  Common Stock
  12/31/2015
  Compensation
  Issuer
  N
  1627
  12/31/2015
  N/A
  Common Stock
  03/24/2020
  Compensation
  Issuer
  N
  30190
  03/24/2020
  N/A
  Common Stock
  07/01/2022
  Compensation
  Issuer
  N
  29877
  07/01/2022
  N/A
  Common Stock
  07/01/2024
  Compensation
  Issuer
  N
  17549
  07/01/2024
  N/A
  Y
  The shares filed today will be sold by the Jesse E. Gary Revocable Trust, Jesse E. Gary as Trustee
  12/26/2024
  /s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for Jesse E. Gary