<SEC-DOCUMENT>0001438588-12-000063.txt : 20121213
<SEC-HEADER>0001438588-12-000063.hdr.sgml : 20121213
<ACCEPTANCE-DATETIME>20121213161040
ACCESSION NUMBER:		0001438588-12-000063
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20121212
FILED AS OF DATE:		20121213
DATE AS OF CHANGE:		20121213

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LIMBER JOSEPH M
		CENTRAL INDEX KEY:			0001216023

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14710
		FILM NUMBER:		121262206

	MAIL ADDRESS:	
		STREET 1:		ACLARA BIOSCIENCES INC
		STREET 2:		1288 PEAR AVE
		CITY:			MOUNTAIN VIEW
		STATE:			CA
		ZIP:			94043

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>3
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2012-12-12</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001216023</rptOwnerCik>
            <rptOwnerName>LIMBER JOSEPH M</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>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Share Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>2.72</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2022-12-12</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>23200</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2015-12-12</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>16800</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Exercisable with respect to 1/36th of options in monthly increments beginning 1/12/2013 and ending 12/12/2015.</footnote>
        <footnote id="F2">These restricted stock units are scheduled to vest in substantially equal installments annually over three years, with the first installment vesting on December 12, 2013.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: Fred Kurland  For: Joseph M. Limber</signatureName>
        <signatureDate>2012-12-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poalimber.txt
<DESCRIPTION>EDGAR SUPPORTING DOCUMENT
<TEXT>
POWER OF ATTORNEY
       Know all by these presents, that the undersigned hereby constitutes and
 appoints each of Fred Kurland, John Varian and Diane Wilcock, signing singly,
 his true and lawful attorneys-in-fact to:
(1)	execute for and on behalf of the undersigned Forms 3, 4 or 5 in
accordance with Section 16 of the Securities Exchange Act of 1934, as amended
and the rules and regulations promulgated thereunder (the "Exchange Act");
(2)	do and perform any and all acts for and on behalf of the undersigned
which may be necessary or desirable to complete the execution and delivery of
any such Form 3, 4 or 5 and timely filing of any such form with the United
States Securities and Exchange Commission and any other authority; and
(3)	take any other action of any type whatsoever in connection with the
foregoing which in the opinion of such attorney-in-fact, may be of benefit to,
in the best interest of, or legally required of, the undersigned, it being
understood that the documents executed by such attorney-in-fact on behalf of
the undersigned pursuant to this Power of Attorney shall be in such form and
shall contain such terms and conditions as such attorney-in-fact may approve
in his discretion.
      The undersigned hereby grants to each attorney-in-fact full power and
authority to do and perform all and every act and thing whatsoever requisite,
necessary and proper to be done in the exercise of any of the rights and powers
 herein granted, as fully to all intents and purposes as such undersigned
person might or could do if personally present with full power of substitution
or revocation, hereby ratifying and confirming all that such attorney-in-fact,
or his substitute or substitutes, shall lawfully do or cause to be done by
virtue of this power of attorney and the rights and powers herein granted.
The undersigned acknowledges that the foregoing attorneys-in-fact, in serving
in such capacity at the request of the undersigned, are not assuming any of
the undersigned's responsibilities to comply with Section 16 of the Exchange
Act.
      This Power of Attorney shall expire on August 31, 2014.
	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed and it shall be effective as of December 7, 2012.
//s/ Joseph M. Limber
Joseph M. Limber








Fax to 510-649-7571
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
