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      <filer>
        <filerCredentials>
          <cik>0001603836</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
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  <formData>
    <issuerInfo>
      <issuerCik>0000949157</issuerCik>
      <issuerName>CENTURY ALUMINUM CO</issuerName>
      <secFileNumber>001-34474</secFileNumber>
      <issuerAddress>
        <com:street1>1 SOUTH WACKER DRIVE</com:street1>
        <com:street2>SUITE 1000</com:street2>
        <com:city>CHICAGO</com:city>
        <com:stateOrCountry>IL</com:stateOrCountry>
        <com:zipCode>60606</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>3126963101</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Hoffman Robert F</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Charles Schwab &amp; Co.</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>12000</noOfUnitsSold>
      <aggregateMarketValue>245940.00</aggregateMarketValue>
      <noOfUnitsOutstanding>92293344</noOfUnitsOutstanding>
      <approxSaleDate>03/17/2025</approxSaleDate>
      <securitiesExchangeName>NASDAQ GS</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <acquiredDate>12/31/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Equity Compensation</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>12000</amountOfSecuritiesAcquired>
      <paymentDate>12/31/2022</paymentDate>
      <natureOfPayment>Services Rendered</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <remarks>Shares to be sold were acquired as Equity Compensation between 12/31/2022-12/31/23</remarks>
    <noticeSignature>
      <noticeDate>03/17/2025</noticeDate>
      <signature>Robert Hoffman</signature>
    </noticeSignature>
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144
0001603836
XXXXXXXX
LIVE
0000949157
CENTURY ALUMINUM CO
001-34474
1 SOUTH WACKER DRIVE
SUITE 1000
CHICAGO
IL
60606
3126963101
Hoffman Robert F
Officer
Common Stock
Charles Schwab & Co.
3000 Schwab Way
Westlake
TX
76262
12000
245940.00
92293344
03/17/2025
NASDAQ GS
Common Stock
12/31/2022
Equity Compensation
Issuer
N
12000
12/31/2022
Services Rendered
Y
Shares to be sold were acquired as Equity Compensation between 12/31/2022-12/31/23
03/17/2025
Robert Hoffman