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>0001445826</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>David R. Epstein</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
  <relationshipsToIssuer>
  <relationshipToIssuer>Officer</relationshipToIssuer>
  </relationshipsToIssuer>
  </issuerInfo>
  <securitiesInformation>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <brokerOrMarketmakerDetails>
  <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
  <address>
  <street1 xmlns="http://www.sec.gov/edgar/common">1 New York Plaza</street1>
  <street2 xmlns="http://www.sec.gov/edgar/common">38th Fl.</street2>
  <city xmlns="http://www.sec.gov/edgar/common">New York</city>
  <stateOrCountry xmlns="http://www.sec.gov/edgar/common">NY</stateOrCountry>
  <zipCode xmlns="http://www.sec.gov/edgar/common">10004</zipCode>
  </address>
  </brokerOrMarketmakerDetails>
  <noOfUnitsSold>10620</noOfUnitsSold>
  <aggregateMarketValue>2262166.20</aggregateMarketValue>
  <noOfUnitsOutstanding>188662672</noOfUnitsOutstanding>
  <approxSaleDate>11/10/2023</approxSaleDate>
  <securitiesExchangeName>Nasdaq</securitiesExchangeName>
  </securitiesInformation>
  <securitiesToBeSold>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <acquiredDate>11/09/2023</acquiredDate>
  <natureOfAcquisitionTransaction>Vesting of Restricted Stock Units</natureOfAcquisitionTransaction>
  <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
  <isGiftTransaction>N</isGiftTransaction>
  <amountOfSecuritiesAcquired>26848</amountOfSecuritiesAcquired>
  <paymentDate>11/09/2023</paymentDate>
  <natureOfPayment>Compensation</natureOfPayment>
  </securitiesToBeSold>
  <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
  <remarks>The sales reported on this Form 144 are being effected pursuant to a written agreement governing the terms of restricted stock units granted to the filer, which includes a plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) to satisfy tax obligations arising out of the vesting of such stock units (the "Sell-to-Cover Trading Arrangement"). The written agreement, adopted December 14, 2022, provides that, if the filer is in possession of material, nonpublic information as of the date of grant of such stock units, then the Sell-to-Cover Trading Arrangement becomes a binding contract as of the first date thereafter on which the filer is not in possession of material, nonpublic information.</remarks>
  <noticeSignature>
  <noticeDate>11/13/2023</noticeDate>
  <planAdoptionDates>
  <planAdoptionDate>12/14/2022</planAdoptionDate>
  </planAdoptionDates>
  <signature>/s/ Jennifer Prosba For: David R. Epstein</signature>
  </noticeSignature>
  </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 3616}]
text: 144
  0001445826
  XXXXXXXX
  LIVE
  0001060736
  Seagen Inc.
  000-32405
  21823 30th Dr. SE
  Bothell
  WA
  98021
  (425)-527-4000
  David R. Epstein
  Officer
  Common Stock
  Morgan Stanley Smith Barney LLC Executive Financial Services
  1 New York Plaza
  38th Fl.
  New York
  NY
  10004
  10620
  2262166.20
  188662672
  11/10/2023
  Nasdaq
  Common Stock
  11/09/2023
  Vesting of Restricted Stock Units
  Issuer
  N
  26848
  11/09/2023
  Compensation
  Y
  The sales reported on this Form 144 are being effected pursuant to a written agreement governing the terms of restricted stock units granted to the filer, which includes a plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) to satisfy tax obligations arising out of the vesting of such stock units (the "Sell-to-Cover Trading Arrangement"). The written agreement, adopted December 14, 2022, provides that, if the filer is in possession of material, nonpublic information as of the date of grant of such stock units, then the Sell-to-Cover Trading Arrangement becomes a binding contract as of the first date thereafter on which the filer is not in possession of material, nonpublic information.
  11/13/2023
  12/14/2022
  /s/ Jennifer Prosba For: David R. Epstein