<SEC-DOCUMENT>0000791908-14-000045.txt : 20140320
<SEC-HEADER>0000791908-14-000045.hdr.sgml : 20140320
<ACCEPTANCE-DATETIME>20140320153832
ACCESSION NUMBER:		0000791908-14-000045
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20140318
FILED AS OF DATE:		20140320
DATE AS OF CHANGE:		20140320

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:			BERKELEY
		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

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			RUBIN PAUL D
		CENTRAL INDEX KEY:			0001210905

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14710
		FILM NUMBER:		14706732

	MAIL ADDRESS:	
		STREET 1:		37 GREYSTONE LANE
		CITY:			SUDBURY
		STATE:			MA
		ZIP:			01776
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
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    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2014-03-18</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000791908</issuerCik>
        <issuerName>XOMA Corp</issuerName>
        <issuerTradingSymbol>XOMA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
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            <rptOwnerName>RUBIN PAUL D</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>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Sr. VP Clinical Dev. &amp; CMO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            <transactionDate>
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        <nonDerivativeHolding>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>by 401(k)</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Incentive Share Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>3.04</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2014-03-18</value>
            </transactionDate>
            <transactionCoding>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F7"/>
            </exerciseDate>
            <expirationDate>
                <value>2021-05-31</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                </sharesOwnedFollowingTransaction>
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        <derivativeTransaction>
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    <footnotes>
        <footnote id="F1">These restricted stock units were granted on February 28, 2013 and are scheduled to vest in substantially equal installments on each of March 18, 2014, March 18, 2015, and March 18, 2016.</footnote>
        <footnote id="F2">Each restricted stock unit represents the right to receive, at settlement, one share of common stock. This nondiscretionary transaction represents the settlement of vested restricted stock units in shares of common stock.</footnote>
        <footnote id="F3">Shares sold on the open market to satisfy the minimum amount of taxes required to be withheld in connection with the vesting of the shares in a non-discretionary transaction pursuant to the reporting person's agreement under the Company's equity incentive plan.</footnote>
        <footnote id="F4">These restricted stock units are scheduled to vest in substantially equal installments annually over three years, with the first installment vesting on March 18, 2013.</footnote>
        <footnote id="F5">This transaction was made pursuant to Rule 10b5-1 trading plan adopted by the reporting person on 3/20/2013.</footnote>
        <footnote id="F6">This transaction was executed in multiple trades ranging at prices from $6.16 to $6.41.The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Company or a security holder of the Company full information regarding the number of shares and prices at which the transactions were effected.</footnote>
        <footnote id="F7">Incentive Stock Option exercisable in conjunction with matching Non-Qualified Stock Option as to (a) 25% of the option shares upon the first anniversary of the date of grant, and (b) the remaining 75% of the option shares in thirty-six (36) equal and consecutive monthly installments beginning one year and one month after the date of grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: Russell J. Wood  For: Paul D. Rubin</signatureName>
        <signatureDate>2014-03-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
