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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 NRsJyrsrlV/XSOQ0mY4JxHJcJVDW+4sigcDKEhLQhl4Yu2cad1bRiiwhKjYf+J2n
 8JoMqiQWdT99vp1QdkQIUg==

<SEC-DOCUMENT>0001181431-03-013419.txt : 20030709
<SEC-HEADER>0001181431-03-013419.hdr.sgml : 20030709
<ACCEPTANCE-DATETIME>20030709103902
ACCESSION NUMBER:		0001181431-03-013419
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030708
FILED AS OF DATE:		20030709

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BAKER FELIX
		CENTRAL INDEX KEY:			0001087940

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	333-50266
		FILM NUMBER:		03779373

	BUSINESS ADDRESS:	
		STREET 1:		TISCH FAMILY INTERESTS
		STREET 2:		667 MADISON AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10021
		BUSINESS PHONE:		2125212420

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SEATTLE GENETICS INC /WA
		CENTRAL INDEX KEY:			0001060736
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				911874389
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		21823 30TH DRIVE SE
		STREET 2:		SUITE
		CITY:			BOTHELL
		STATE:			WA
		ZIP:			98021
		BUSINESS PHONE:		4255274000

	MAIL ADDRESS:	
		STREET 1:		21823 30TH DRIVE SE
		STREET 2:		SUITE
		CITY:			BOTHELL
		STATE:			WA
		ZIP:			98021
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>rrd12773.xml
<DESCRIPTION>INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>3</documentType>
<periodOfReport>2003-07-08</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001060736</issuerCik>
        <issuerName>SEATTLE GENETICS INC /WA</issuerName>
        <issuerTradingSymbol>SGEN</issuerTradingSymbol></issuer>
<reportingOwner>
<reportingOwnerId>
            <rptOwnerCik>0001087940</rptOwnerCik>
            <rptOwnerName>BAKER FELIX</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector>
<isOfficer>0</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
<officerTitle></officerTitle>
<otherText></otherText></reportingOwnerRelationship></reportingOwner>
<derivativeSecurity>
<securityTitle>
<value>Common Stock Warrants (right to buy)</value></securityTitle>
<conversionOrExercisePrice>
<value>6.25</value></conversionOrExercisePrice>
<exerciseDate>
<value>2003-07-08</value></exerciseDate>
<expirationDate>
<value>2011-12-31</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>812500</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>I</value></directOrIndirectOwnership>
<natureOfOwnership>
<value>See Footnote</value>
<footnoteId id="F1"/>
<footnoteId id="F2"/></natureOfOwnership></ownershipNature></derivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Series A Convertible Preferred Stock</value></securityTitle>
<conversionOrExercisePrice>
<value>2.50</value></conversionOrExercisePrice>
<exerciseDate>
<value>2004-07-08</value></exerciseDate>
<expirationDate>
<value>1988-08-08</value>
<footnoteId id="F3"/></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>6500000</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>I</value></directOrIndirectOwnership>
<natureOfOwnership>
<value>See Footnote</value>
<footnoteId id="F1"/>
<footnoteId id="F2"/></natureOfOwnership></ownershipNature></derivativeSecurity>
<footnotes>
<footnote id="F1">The securities are owned by Baker/Tisch Investments, L.P., Baker Bros. Investments, L.P., Baker Bros. Investments II, L.P., Baker Biotech Fund I, L.P., Baker Biotech Fund II, L.P. and Baker Biotech Fund (Z), L.P. (each, a &quot;Limited Partnership&quot;), which may be deemed to be controlled by the Reporting Person. The Limited Partnerships purchased the Warrants and 650,000 shares of Series A Convertible Preferred Stock, convertible into 6,500,000 shares of Common Stock, pursuant to a Securities Purchase Agreement, dated as of May 12, 2003, as amended on May 14, 2003 and June 2, 2003, with the Issuer.</footnote>
<footnote id="F2">Pursuant to an Investor Rights Agreement, dated July 8, 2003, among the Issuer and the holders of the Series A Convertible Preferred Stock of the Issuer, the Limited Partnerships have the right to designate a director of the Issuer. The Reporting Person has been appointed to the Issuer&apos;s board of directors in connection therewith. The Reporting Person disclaims beneficial ownership of the securities owned by the Limited Partnerships.</footnote>
<footnote id="F3">None.</footnote></footnotes>
<ownerSignature>
<signatureName>Felix J. Baker</signatureName>
<signatureDate>2003-07-08</signatureDate></ownerSignature></ownershipDocument>


</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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