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      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001806189</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
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      <issuerInfo>
        <issuerCik>0001673985</issuerCik>
        <issuerName>AdvanSix Inc.</issuerName>
        <secFileNumber>001-37774</secFileNumber>
        <issuerAddress>
          <com:street1>300 KIMBALL DRIVE</com:street1>
          <com:street2>SUITE 101</com:street2>
          <com:city>PARSIPPANY</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07054</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>(973) 526-1800</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Kintiroglou Achilles B.</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Merrill Lynch</name>
          <address>
            <com:street1>225 Liberty St</com:street1>
            <com:street2>Floor 37</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10281</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>3237</noOfUnitsSold>
        <aggregateMarketValue>69077.58</aggregateMarketValue>
        <noOfUnitsOutstanding>26744101</noOfUnitsOutstanding>
        <approxSaleDate>05/01/2025</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/28/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting of performance share unit award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>AdvanSix Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1641</amountOfSecuritiesAcquired>
        <paymentDate>02/28/2024</paymentDate>
        <natureOfPayment>Granted as part of issuer equity compensation plan</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/28/2025</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting of restricted stock unit award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>AdvanSix Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1596</amountOfSecuritiesAcquired>
        <paymentDate>02/28/2025</paymentDate>
        <natureOfPayment>Granted as part of issuer equity compensation plan</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Achilleus Kintiroglou</name>
          <address>
            <com:street1>300 KIMBALL DRIVE</com:street1>
            <com:city>PARSIPPANY</com:city>
            <com:stateOrCountry>NJ</com:stateOrCountry>
            <com:zipCode>07054</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <saleDate>03/03/2025</saleDate>
        <amountOfSecuritiesSold>4000</amountOfSecuritiesSold>
        <grossProceeds>111000.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Achilleus Kintiroglou</name>
          <address>
            <com:street1>300 KIMBALL DRIVE</com:street1>
            <com:city>PARSIPPANY</com:city>
            <com:stateOrCountry>NJ</com:stateOrCountry>
            <com:zipCode>07054</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <saleDate>04/01/2025</saleDate>
        <amountOfSecuritiesSold>4000</amountOfSecuritiesSold>
        <grossProceeds>88960.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>05/01/2025</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>11/12/2024</planAdoptionDate>
        </planAdoptionDates>
        <signature>Achilleus Kintiroglou</signature>
      </noticeSignature>
    </formData>
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text: 144
  0001806189
  XXXXXXXX
  LIVE
  0001673985
  AdvanSix Inc.
  001-37774
  300 KIMBALL DRIVE
  SUITE 101
  PARSIPPANY
  NJ
  07054
  (973) 526-1800
  Kintiroglou Achilles B.
  Officer
  Common Stock
  Merrill Lynch
  225 Liberty St
  Floor 37
  New York
  NY
  10281
  3237
  69077.58
  26744101
  05/01/2025
  NYSE
  Common Stock
  02/28/2024
  Vesting of performance share unit award
  AdvanSix Inc.
  N
  1641
  02/28/2024
  Granted as part of issuer equity compensation plan
  Common Stock
  02/28/2025
  Vesting of restricted stock unit award
  AdvanSix Inc.
  N
  1596
  02/28/2025
  Granted as part of issuer equity compensation plan
  N
  Achilleus Kintiroglou
  300 KIMBALL DRIVE
  PARSIPPANY
  NJ
  07054
  Common Stock
  03/03/2025
  4000
  111000.00
  Achilleus Kintiroglou
  300 KIMBALL DRIVE
  PARSIPPANY
  NJ
  07054
  Common Stock
  04/01/2025
  4000
  88960.00
  05/01/2025
  11/12/2024
  Achilleus Kintiroglou