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">
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  <submissionType>144</submissionType>
  <filerInfo>
  <filer>
  <filerCredentials>
  <cik>0001809717</cik>
  <ccc>XXXXXXXX</ccc>
  </filerCredentials>
  </filer>
  <liveTestFlag>LIVE</liveTestFlag>
  </filerInfo>
  </headerData>
  <formData>
  <issuerInfo>
  <issuerCik>0001060736</issuerCik>
  <issuerName>Seagen Inc.</issuerName>
  <secFileNumber>000-32405</secFileNumber>
  <issuerAddress>
  <street1 xmlns="http://www.sec.gov/edgar/common">21823 30th Dr. SE</street1>
  <city xmlns="http://www.sec.gov/edgar/common">Bothell</city>
  <stateOrCountry xmlns="http://www.sec.gov/edgar/common">WA</stateOrCountry>
  <zipCode xmlns="http://www.sec.gov/edgar/common">98021</zipCode>
  </issuerAddress>
  <issuerContactPhone>(425) -527-4000</issuerContactPhone>
  <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Charles R. Romp</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
  <relationshipsToIssuer>
  <relationshipToIssuer>Officer</relationshipToIssuer>
  </relationshipsToIssuer>
  </issuerInfo>
  <securitiesInformation>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <brokerOrMarketmakerDetails>
  <name>E*TRADE Financial Corporation</name>
  <address>
  <street1 xmlns="http://www.sec.gov/edgar/common">3 Edison Drive</street1>
  <city xmlns="http://www.sec.gov/edgar/common">Alpharetta</city>
  <stateOrCountry xmlns="http://www.sec.gov/edgar/common">GA</stateOrCountry>
  <zipCode xmlns="http://www.sec.gov/edgar/common">30005</zipCode>
  </address>
  </brokerOrMarketmakerDetails>
  <noOfUnitsSold>708</noOfUnitsSold>
  <aggregateMarketValue>136261.68</aggregateMarketValue>
  <noOfUnitsOutstanding>187503979</noOfUnitsOutstanding>
  <approxSaleDate>07/03/2023</approxSaleDate>
  <securitiesExchangeName>Nasdaq</securitiesExchangeName>
  </securitiesInformation>
  <securitiesToBeSold>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <acquiredDate>07/01/2023</acquiredDate>
  <natureOfAcquisitionTransaction>Vesting of Restricted Stock Units</natureOfAcquisitionTransaction>
  <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
  <isGiftTransaction>N</isGiftTransaction>
  <amountOfSecuritiesAcquired>1798</amountOfSecuritiesAcquired>
  <paymentDate>07/01/2023</paymentDate>
  <natureOfPayment>Compensation</natureOfPayment>
  </securitiesToBeSold>
  <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
  <securitiesSoldInPast3Months>
  <sellerDetails>
  <name>Charles R. Romp</name>
  <address>
  <street1 xmlns="http://www.sec.gov/edgar/common">21823 30th Dr. SE</street1>
  <city xmlns="http://www.sec.gov/edgar/common">Bothell</city>
  <stateOrCountry xmlns="http://www.sec.gov/edgar/common">WA</stateOrCountry>
  <zipCode xmlns="http://www.sec.gov/edgar/common">98021</zipCode>
  </address>
  </sellerDetails>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <saleDate>04/06/2023</saleDate>
  <amountOfSecuritiesSold>133</amountOfSecuritiesSold>
  <grossProceeds>27378.93</grossProceeds>
  </securitiesSoldInPast3Months>
  <securitiesSoldInPast3Months>
  <sellerDetails>
  <name>Charles R. Romp</name>
  <address>
  <street1 xmlns="http://www.sec.gov/edgar/common">21823 30th Dr. SE</street1>
  <city xmlns="http://www.sec.gov/edgar/common">Bothell</city>
  <stateOrCountry xmlns="http://www.sec.gov/edgar/common">WA</stateOrCountry>
  <zipCode xmlns="http://www.sec.gov/edgar/common">98021</zipCode>
  </address>
  </sellerDetails>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <saleDate>05/16/2023</saleDate>
  <amountOfSecuritiesSold>349</amountOfSecuritiesSold>
  <grossProceeds>66260.93</grossProceeds>
  </securitiesSoldInPast3Months>
  <noticeSignature>
  <noticeDate>07/03/2023</noticeDate>
  <planAdoptionDates>
  <planAdoptionDate>07/25/2019</planAdoptionDate>
  </planAdoptionDates>
  <signature>/s/ Jennifer Prosba For: Charles R. Romp</signature>
  </noticeSignature>
  </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 3985}]
text: 144
  0001809717
  XXXXXXXX
  LIVE
  0001060736
  Seagen Inc.
  000-32405
  21823 30th Dr. SE
  Bothell
  WA
  98021
  (425) -527-4000
  Charles R. Romp
  Officer
  Common Stock
  E*TRADE Financial Corporation
  3 Edison Drive
  Alpharetta
  GA
  30005
  708
  136261.68
  187503979
  07/03/2023
  Nasdaq
  Common Stock
  07/01/2023
  Vesting of Restricted Stock Units
  Issuer
  N
  1798
  07/01/2023
  Compensation
  N
  Charles R. Romp
  21823 30th Dr. SE
  Bothell
  WA
  98021
  Common Stock
  04/06/2023
  133
  27378.93
  Charles R. Romp
  21823 30th Dr. SE
  Bothell
  WA
  98021
  Common Stock
  05/16/2023
  349
  66260.93
  07/03/2023
  07/25/2019
  /s/ Jennifer Prosba For: Charles R. Romp