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>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>3093</noOfUnitsSold>
  <aggregateMarketValue>600660.60</aggregateMarketValue>
  <noOfUnitsOutstanding>187697935</noOfUnitsOutstanding>
  <approxSaleDate>08/16/2023</approxSaleDate>
  <securitiesExchangeName>Nasdaq</securitiesExchangeName>
  </securitiesInformation>
  <securitiesToBeSold>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <acquiredDate>08/15/2023</acquiredDate>
  <natureOfAcquisitionTransaction>Vesting of Restricted Stock Units</natureOfAcquisitionTransaction>
  <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
  <isGiftTransaction>N</isGiftTransaction>
  <amountOfSecuritiesAcquired>1949</amountOfSecuritiesAcquired>
  <paymentDate>08/15/2023</paymentDate>
  <natureOfPayment>Compensation</natureOfPayment>
  </securitiesToBeSold>
  <securitiesToBeSold>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <acquiredDate>08/15/2023</acquiredDate>
  <natureOfAcquisitionTransaction>Vesting of Restricted Stock Units</natureOfAcquisitionTransaction>
  <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
  <isGiftTransaction>N</isGiftTransaction>
  <amountOfSecuritiesAcquired>2477</amountOfSecuritiesAcquired>
  <paymentDate>08/15/2023</paymentDate>
  <natureOfPayment>Compensation</natureOfPayment>
  </securitiesToBeSold>
  <securitiesToBeSold>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <acquiredDate>08/15/2023</acquiredDate>
  <natureOfAcquisitionTransaction>Vesting of Restricted Stock Units</natureOfAcquisitionTransaction>
  <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
  <isGiftTransaction>N</isGiftTransaction>
  <amountOfSecuritiesAcquired>3433</amountOfSecuritiesAcquired>
  <paymentDate>08/15/2023</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>07/03/2023</saleDate>
  <amountOfSecuritiesSold>708</amountOfSecuritiesSold>
  <grossProceeds>136261.68</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>
  <remarks>The sales reported on this Form 144 are being effected pursuant to written agreements governing the terms of restricted stock units granted to the filer, which include plans 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 September 26, 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>08/16/2023</noticeDate>
  <planAdoptionDates>
  <planAdoptionDate>11/03/2020</planAdoptionDate>
  <planAdoptionDate>11/02/2021</planAdoptionDate>
  <planAdoptionDate>09/26/2022</planAdoptionDate>
  </planAdoptionDates>
  <signature>/s/ Jessica Nielsen Causey For: Charles R. Romp</signature>
  </noticeSignature>
  </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 5819}]
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
  3093
  600660.60
  187697935
  08/16/2023
  Nasdaq
  Common Stock
  08/15/2023
  Vesting of Restricted Stock Units
  Issuer
  N
  1949
  08/15/2023
  Compensation
  Common Stock
  08/15/2023
  Vesting of Restricted Stock Units
  Issuer
  N
  2477
  08/15/2023
  Compensation
  Common Stock
  08/15/2023
  Vesting of Restricted Stock Units
  Issuer
  N
  3433
  08/15/2023
  Compensation
  N
  Charles R. Romp
  21823 30th Dr. SE
  Bothell
  WA
  98021
  Common Stock
  07/03/2023
  708
  136261.68
  Charles R. Romp
  21823 30th Dr. SE
  Bothell
  WA
  98021
  Common Stock
  05/16/2023
  349
  66260.93
  The sales reported on this Form 144 are being effected pursuant to written agreements governing the terms of restricted stock units granted to the filer, which include plans 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 September 26, 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.
  08/16/2023
  11/03/2020
  11/02/2021
  09/26/2022
  /s/ Jessica Nielsen Causey For: Charles R. Romp