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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001457255-10-000002.txt : 20100302
<SEC-HEADER>0001457255-10-000002.hdr.sgml : 20100302
<ACCEPTANCE-DATETIME>20100301203314
ACCESSION NUMBER:		0001457255-10-000002
CONFORMED SUBMISSION TYPE:	D/A
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
ITEM INFORMATION:		Investment Company Act Section 3(c)
ITEM INFORMATION:		Section 3(c)(7)
FILED AS OF DATE:		20100302
DATE AS OF CHANGE:		20100301
EFFECTIVENESS DATE:		20100302

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			U.S. Equity Markets Segregated Portfolio of O'Connor Market Opportunities SPC
		CENTRAL INDEX KEY:			0001457255
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-139150
		FILM NUMBER:		10647184

	BUSINESS ADDRESS:	
		STREET 1:		C/O CITIHEDGE FUND SERVICES (CAYMAN) LTD
		STREET 2:		27 HOSPITAL ROAD, 5TH FLR, PO BOX 10293
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-1003
		BUSINESS PHONE:		(345) 949-5884

	MAIL ADDRESS:	
		STREET 1:		C/O CITIHEDGE FUND SERVICES (CAYMAN) LTD
		STREET 2:		27 HOSPITAL ROAD, 5TH FLR, PO BOX 10293
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-1003
</SEC-HEADER>
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<TYPE>D/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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<edgarSubmission>

    <schemaVersion>X0603</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001457255</cik>
        <entityName>U.S. Equity Markets Segregated Portfolio of O'Connor Market Opportunities SPC</entityName>
        <issuerAddress>
            <street1>CITIHEDGE FUND SERVICES (CAYMAN) LTD</street1>
            <street2>27 HOSPITAL ROAD, 5TH FLR, PO BOX 10293</street2>
            <city>GRAND CAYMAN</city>
            <stateOrCountry>E9</stateOrCountry>
            <zipCode>KY1-1003</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>(345) 949-5884</issuerPhoneNumber>
        <jurisdictionOfInc>CAYMAN ISLANDS</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Other</entityType>
        <entityTypeOtherDesc>Cayman Islands exempted company</entityTypeOtherDesc>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2008</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>n/a</firstName>
                <lastName>UBS O'Connor LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>One North Wacker Drive</street1>
                <street2>32nd Floor</street2>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Investment Manager</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Dawn</firstName>
                <lastName>Fitzpatrick</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o UBS O'Connor LLC</street1>
                <street2>One North Wacker Drive, 32nd Floor</street2>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Nick</firstName>
                <lastName>Nocerino</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o UBS O'Connor LLC</street1>
                <street2>One North Wacker Drive, 32nd Floor</street2>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kipp</firstName>
                <lastName>Schrage</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o UBS O'Connor LLC</street1>
                <street2>One North Wacker Drive, 32nd Floor</street2>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Richard</firstName>
                <middleName>E.</middleName>
                <lastName>Douglas</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Citi Hedge Fund Services (Cayman) Ltd.</street1>
                <street2>27 Hospital Road, 5th Floor, Box 10293</street2>
                <city>Grand Cayman</city>
                <stateOrCountry>E9</stateOrCountry>
                <zipCode>KY1-1003</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <middleName>E.J.</middleName>
                <lastName>Walmsley</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Citi Hedge Fund Services (Cayman) Ltd.</street1>
                <street2>27 Hospital Road, 5th Floor, Box 10293</street2>
                <city>Grand Cayman</city>
                <stateOrCountry>E9</stateOrCountry>
                <zipCode>KY1-1003</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Patricia</firstName>
                <lastName>Watters</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Citi Hedge Fund Services (Cayman) Ltd.</street1>
                <street2>27 Hospital Road, 5th Floor, Box 10293</street2>
                <city>Grand Cayman</city>
                <stateOrCountry>E9</stateOrCountry>
                <zipCode>KY1-1003</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kevin</firstName>
                <lastName>Williams</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Pacific Alternative Asset Management Co.</street1>
                <street2>19540 Jamboree Rd Suite 400</street2>
                <city>Irvine</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>92612</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Hedge Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <aggregateNetAssetValueRange>Decline to Disclose</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
            <item>3C</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001457255-10-000001</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2008-11-14</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>100000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>49661000</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>30</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>U.S. Equity Markets Segregated Portfolio of O'Connor Market Opportunities SPC</issuerName>
                <signatureName>James Meehan</signatureName>
                <nameOfSigner>James Meehan</nameOfSigner>
                <signatureTitle>Director of the Investment Manager</signatureTitle>
                <signatureDate>2010-03-01</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
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</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----