-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 PNpkIC5Ak4XYuxaMaFhtCBVNfP/p/k67M9w34E9sLl79ci/huwx5QU+E3aH3RPSS
 vxAaIUojLdSvmXZ4slXwxg==

<SEC-DOCUMENT>0001454593-09-000002.txt : 20090428
<SEC-HEADER>0001454593-09-000002.hdr.sgml : 20090428
<ACCEPTANCE-DATETIME>20090428150042
ACCESSION NUMBER:		0001454593-09-000002
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:		20090428
DATE AS OF CHANGE:		20090428
EFFECTIVENESS DATE:		20090428

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COMMONFUND INSTITUTIONAL INVESTMENT GRADE CREDIT FUND LLC
		CENTRAL INDEX KEY:			0001454593
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		D/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-126248
		FILM NUMBER:		09775350

	BUSINESS ADDRESS:	
		STREET 1:		C/O COMMONFUND ASSET MANAGEMENT CO INC
		STREET 2:		15 OLD DANBURY ROAD
		CITY:			WILTON
		STATE:			CT
		ZIP:			06897
		BUSINESS PHONE:		203-563-5000

	MAIL ADDRESS:	
		STREET 1:		C/O COMMONFUND ASSET MANAGEMENT CO INC
		STREET 2:		15 OLD DANBURY ROAD
		CITY:			WILTON
		STATE:			CT
		ZIP:			06897
</SEC-HEADER>
<DOCUMENT>
<TYPE>D/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0301</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001454593</cik>
        <entityName>COMMONFUND INSTITUTIONAL INVESTMENT GRADE CREDIT FUND LLC</entityName>
        <issuerAddress>
            <street1>15 OLD DANBURY ROAD</street1>
            <street2></street2>
            <city>WILTON</city>
            <stateOrCountry>CT</stateOrCountry>
            <zipCode>06897</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>203-563-5000</issuerPhoneNumber>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <jurisdictionOfInc>DE</jurisdictionOfInc>
        <entityType>Limited Liability Company</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2008</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>LYN</firstName>
                <middleName></middleName>
                <lastName>HUTTON</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 OLD DANBURY ROAD</street1>
                <street2></street2>
                <city>WILTON</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06897</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>DIRECTOR OF THE MANAGING MEMBER</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>MARYELLEN</firstName>
                <middleName></middleName>
                <lastName>BEAUDREAULT</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 OLD DANBURY ROAD</street1>
                <street2></street2>
                <city>WILTON</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06897</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>DIRECTOR OF THE MANAGING MEMBER</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>NICHOLAS</firstName>
                <middleName></middleName>
                <lastName>DE MONICO</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 OLD DANBURY ROAD</street1>
                <street2></street2>
                <city>WILTON</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06897</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>DIRECTOR OF THE MANAGING MEMBER</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>VERNE</firstName>
                <middleName></middleName>
                <lastName>SEDLACEK</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 OLD DANBURY ROAD</street1>
                <street2></street2>
                <city>WILTON</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06897</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>DIRECTOR OF THE MANAGING MEMBER</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>ARTHUR</firstName>
                <middleName></middleName>
                <lastName>GARDINER</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 OLD DANBURY ROAD</street1>
                <street2></street2>
                <city>WILTON</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06897</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>DIRECTOR OF THE MANAGING MEMBER</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>JEFFREY</firstName>
                <middleName></middleName>
                <lastName>LONG</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 OLD DANBURY ROAD</street1>
                <street2></street2>
                <city>WILTON</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06897</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>DIRECTOR OF THE MANAGING MEMBER</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>MICHAEL</firstName>
                <middleName></middleName>
                <lastName>STRAUSS</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 OLD DANBURY ROAD</street1>
                <street2></street2>
                <city>WILTON</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06897</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>EXECUTIVE OFFICER AND DIRECTOR OF THE MANAGING MEMBER</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>JOHN</firstName>
                <middleName></middleName>
                <lastName>AUCHINCLOSS</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 OLD DANBURY ROAD</street1>
                <street2></street2>
                <city>WILTON</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06897</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>EXECUTIVE OFFICER OF THE MANAGING MEMBER</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>CAROLYN</firstName>
                <middleName></middleName>
                <lastName>BLANCH</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 OLD DANBURY ROAD</street1>
                <street2></street2>
                <city>WILTON</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06897</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>EXECUTIVE OFFICER OF THE MANAGING MEMBER</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>9999999997-09-001973</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2008-12-31</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>500000</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>COMMONFUND SECURITIES, INC.</recipientName>
                <recipientCRDNumber>43541</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>15 OLD DANBURY ROAD</street1>
                    <street2></street2>
                    <city>WILTON</city>
                    <stateOrCountry>CT</stateOrCountry>
                    <zipCode>06897</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>172962902</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>67</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
                <isEstimate>true</isEstimate>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
                <isEstimate>true</isEstimate>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>COMMONFUND INSTITUTIONAL INVESTMENT GRADE CREDIT FUND LLC</issuerName>
                <signatureName>JOHN W. AUCHINCLOSS</signatureName>
                <nameOfSigner>JOHN W. AUCHINCLOSS</nameOfSigner>
                <signatureTitle>SECRETARY OF THE MANAGING MEMBER OF THE ISSUER</signatureTitle>
                <signatureDate>2009-04-28</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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