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                <ns2:stateOrCountry>WA</ns2:stateOrCountry>
                <ns2:zipCode>98021</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(425) 527-4000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>ROGER DANSEY</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
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        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
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                <name>Morgan Stanley Smith Barney LLC</name>
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                    <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>
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            <aggregateMarketValue>2059487.00</aggregateMarketValue>
            <noOfUnitsOutstanding>187113577</noOfUnitsOutstanding>
            <approxSaleDate>04/17/2023</approxSaleDate>
            <securitiesExchangeName>NASD</securitiesExchangeName>
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            <natureOfAcquisitionTransaction>Stock Options</natureOfAcquisitionTransaction>
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            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>10000</amountOfSecuritiesAcquired>
            <paymentDate>04/17/2023</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
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                    <ns2:stateOrCountry>WA</ns2:stateOrCountry>
                    <ns2:zipCode>98021</ns2:zipCode>
                </address>
            </sellerDetails>
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            <amountOfSecuritiesSold>333</amountOfSecuritiesSold>
            <grossProceeds>68549.00</grossProceeds>
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        <securitiesSoldInPast3Months>
            <sellerDetails>
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                    <ns2:stateOrCountry>WA</ns2:stateOrCountry>
                    <ns2:zipCode>98021</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
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            <amountOfSecuritiesSold>10000</amountOfSecuritiesSold>
            <grossProceeds>1998089.00</grossProceeds>
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        <securitiesSoldInPast3Months>
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                    <ns2:zipCode>98021</ns2:zipCode>
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            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <saleDate>02/15/2023</saleDate>
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            <grossProceeds>1406365.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>ROGER DANSEY</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>02/02/2023</saleDate>
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        <securitiesSoldInPast3Months>
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                    <ns2:zipCode>98021</ns2:zipCode>
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        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>04/17/2023</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>09/09/2022</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Roger D. Dansey</signature>
        </noticeSignature>
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144
0001741836
XXXXXXXX
LIVE
0001060736
SEAGEN INC.
000-32405
21823 30TH DRIVE SE
BOTHELL
WA
98021
(425) 527-4000
ROGER DANSEY
Officer
Common
Morgan Stanley Smith Barney LLC
1 New York Plaza
38th Floor
New York
NY
10004
10000
2059487.00
187113577
04/17/2023
NASD
Common
04/17/2023
Stock Options
Issuer
N
10000
04/17/2023
Cash
N
ROGER DANSEY
21823 30TH DRIVE SE
BOTHELL
WA
98021
COMMON
04/06/2023
333
68549.00
ROGER DANSEY
21823 30TH DRIVE SE
BOTHELL
WA
98021
COMMON
03/15/2023
10000
1998089.00
ROGER DANSEY
21823 30TH DRIVE SE
BOTHELL
WA
98021
COMMON
02/15/2023
10000
1406365.00
ROGER DANSEY
21823 30TH DRIVE SE
BOTHELL
WA
98021
COMMON
02/02/2023
783
108450.00
ROGER DANSEY
21823 30TH DRIVE SE
BOTHELL
WA
98021
COMMON
01/24/2023
10000
1349999.00
04/17/2023
09/09/2022
/s/ Roger D. Dansey