<SEC-DOCUMENT>0001438588-12-000056.txt : 20121115
<SEC-HEADER>0001438588-12-000056.hdr.sgml : 20121115
<ACCEPTANCE-DATETIME>20121115100159
ACCESSION NUMBER:		0001438588-12-000056
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20121113
FILED AS OF DATE:		20121115
DATE AS OF CHANGE:		20121115

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Varian John
		CENTRAL INDEX KEY:			0001416176

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14710
		FILM NUMBER:		121207283

	MAIL ADDRESS:	
		STREET 1:		ARYX THERAPEUTICS,INC.
		STREET 2:		6300 DUMBARTON CIRCLE
		CITY:			FREMONT
		STATE:			CA
		ZIP:			94555

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			XOMA Corp
		CENTRAL INDEX KEY:			0000791908
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				942756657
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2910 SEVENTH ST
		CITY:			BERKELEY
		STATE:			CA
		ZIP:			94710
		BUSINESS PHONE:		5106441170

	MAIL ADDRESS:	
		STREET 1:		2910 SEVENTH ST
		CITY:			BERKLEY
		STATE:			CA
		ZIP:			94710

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	XOMA LTD /DE/
		DATE OF NAME CHANGE:	19990107

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	XOMA CORP /DE/
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
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<DESCRIPTION>PRIMARY DOCUMENT
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        <issuerName>XOMA Corp</issuerName>
        <issuerTradingSymbol>XOMA</issuerTradingSymbol>
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            <rptOwnerCik>0001416176</rptOwnerCik>
            <rptOwnerName>Varian John</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O XOMA CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>2910 SEVENTH STREET</rptOwnerStreet2>
            <rptOwnerCity>BERKELEY</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94710</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Director and CEO</officerTitle>
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            <securityTitle>
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                <value>Common Shares</value>
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                <natureOfOwnership>
                    <value>by 401(k)</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
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    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
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                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
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                <value>2012-11-13</value>
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                <footnoteId id="F1"/>
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    <footnotes>
        <footnote id="F1">These restricted stock units were granted on October 27, 2011 and are scheduled to vest in substantially equal installments on each of November 13, 2012, November 13, 2013 and November 14, 2014.</footnote>
        <footnote id="F2">Each restricted stock unit represents the right to receive, at settlement, one share of common stock. This transaction represents the settlement of vested restricted stock units in shares of common stock.</footnote>
        <footnote id="F3">These restricted stock units were granted on January 4, 2012 and are scheduled to vest in substantially equal installments on each of November 13, 2012, November 13, 2013 and November 14, 2014.</footnote>
        <footnote id="F4">Shares sold in the open market to satisfy the minimum amount of taxes required to be withhold in connection with the vesting of the shares.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: Fred Kurland  For: John Varian</signatureName>
        <signatureDate>2012-11-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
