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        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001361966</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
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        <issuerInfo>
            <issuerCik>0001060736</issuerCik>
            <issuerName>SEAGEN INC.</issuerName>
            <secFileNumber>000-32405</secFileNumber>
            <issuerAddress>
                <ns2:street1>21823 30TH DRIVE SE</ns2:street1>
                <ns2:city>BOTHELL</ns2:city>
                <ns2:stateOrCountry>WA</ns2:stateOrCountry>
                <ns2:zipCode>98021</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(425) 527-4000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>VAUGHN HIMES</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>38th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>8785</noOfUnitsSold>
            <aggregateMarketValue>1874086.48</aggregateMarketValue>
            <noOfUnitsOutstanding>187697935</noOfUnitsOutstanding>
            <approxSaleDate>11/09/2023</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>11/09/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>8785</amountOfSecuritiesAcquired>
            <paymentDate>11/09/2023</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>VAUGHN HIMES</name>
                <address>
                    <ns2:street1>21823 30TH DRIVE SE</ns2:street1>
                    <ns2:city>BOTHELL</ns2:city>
                    <ns2:stateOrCountry>WA</ns2:stateOrCountry>
                    <ns2:zipCode>98021</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>09/21/2023</saleDate>
            <amountOfSecuritiesSold>80</amountOfSecuritiesSold>
            <grossProceeds>16520.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>VAUGHN HIMES</name>
                <address>
                    <ns2:street1>21823 30TH DRIVE SE</ns2:street1>
                    <ns2:city>BOTHELL</ns2:city>
                    <ns2:stateOrCountry>WA</ns2:stateOrCountry>
                    <ns2:zipCode>98021</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>09/07/2023</saleDate>
            <amountOfSecuritiesSold>8785</amountOfSecuritiesSold>
            <grossProceeds>1807616.53</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>VAUGHN HIMES</name>
                <address>
                    <ns2:street1>21823 30TH DRIVE SE</ns2:street1>
                    <ns2:city>BOTHELL</ns2:city>
                    <ns2:stateOrCountry>WA</ns2:stateOrCountry>
                    <ns2:zipCode>98021</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>08/31/2023</saleDate>
            <amountOfSecuritiesSold>1795</amountOfSecuritiesSold>
            <grossProceeds>371503.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>VAUGHN HIMES</name>
                <address>
                    <ns2:street1>21823 30TH DRIVE SE</ns2:street1>
                    <ns2:city>BOTHELL</ns2:city>
                    <ns2:stateOrCountry>WA</ns2:stateOrCountry>
                    <ns2:zipCode>98021</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>08/29/2023</saleDate>
            <amountOfSecuritiesSold>371</amountOfSecuritiesSold>
            <grossProceeds>76426.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>VAUGHN HIMES</name>
                <address>
                    <ns2:street1>21823 30TH DRIVE SE</ns2:street1>
                    <ns2:city>BOTHELL</ns2:city>
                    <ns2:stateOrCountry>WA</ns2:stateOrCountry>
                    <ns2:zipCode>98021</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>08/16/2023</saleDate>
            <amountOfSecuritiesSold>2725</amountOfSecuritiesSold>
            <grossProceeds>528292.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>11/09/2023</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>11/29/2022</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Vaughn B. Himes</signature>
        </noticeSignature>
    </formData>
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144
0001361966
XXXXXXXX
LIVE
0001060736
SEAGEN INC.
000-32405
21823 30TH DRIVE SE
BOTHELL
WA
98021
(425) 527-4000
VAUGHN HIMES
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Floor
New York
NY
10004
8785
1874086.48
187697935
11/09/2023
NASDAQ
Common
11/09/2023
Stock Option Exercise
Issuer
N
8785
11/09/2023
Cash
N
VAUGHN HIMES
21823 30TH DRIVE SE
BOTHELL
WA
98021
Common
09/21/2023
80
16520.00
VAUGHN HIMES
21823 30TH DRIVE SE
BOTHELL
WA
98021
Common
09/07/2023
8785
1807616.53
VAUGHN HIMES
21823 30TH DRIVE SE
BOTHELL
WA
98021
Common
08/31/2023
1795
371503.00
VAUGHN HIMES
21823 30TH DRIVE SE
BOTHELL
WA
98021
Common
08/29/2023
371
76426.00
VAUGHN HIMES
21823 30TH DRIVE SE
BOTHELL
WA
98021
Common
08/16/2023
2725
528292.00
11/09/2023
11/29/2022
/s/ Vaughn B. Himes