-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 SQp0Yux5f5oA6zt07ixUcw==

<SEC-DOCUMENT>0001012975-10-000219.txt : 20100615
<SEC-HEADER>0001012975-10-000219.hdr.sgml : 20100615
<ACCEPTANCE-DATETIME>20100615121602
ACCESSION NUMBER:		0001012975-10-000219
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:		20100615
DATE AS OF CHANGE:		20100615
EFFECTIVENESS DATE:		20100615

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COMMONFUND CAPITAL VENTURE PARTNERS IX LP
		CENTRAL INDEX KEY:			0001456962
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		D/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-127141
		FILM NUMBER:		10896797

	BUSINESS ADDRESS:	
		STREET 1:		15 OLD DANBURY ROAD
		CITY:			WILTON
		STATE:			CT
		ZIP:			06897-0812
		BUSINESS PHONE:		203-563-5073

	MAIL ADDRESS:	
		STREET 1:		15 OLD DANBURY ROAD
		CITY:			WILTON
		STATE:			CT
		ZIP:			06897-0812
</SEC-HEADER>
<DOCUMENT>
<TYPE>D/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0704</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001456962</cik>
        <entityName>COMMONFUND CAPITAL VENTURE PARTNERS IX LP</entityName>
        <issuerAddress>
            <street1>15 OLD DANBURY ROAD</street1>
            <city>WILTON</city>
            <stateOrCountry>CT</stateOrCountry>
            <stateOrCountryDescription>CONNECTICUT</stateOrCountryDescription>
            <zipCode>06897-0812</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>203-563-5073</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2009</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Susan</firstName>
                <middleName>J.</middleName>
                <lastName>Carter</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 Old Danbury Road</street1>
                <city>Wilton</city>
                <stateOrCountry>CT</stateOrCountry>
                <stateOrCountryDescription>CONNECTICUT</stateOrCountryDescription>
                <zipCode>06897-0812</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Linda</firstName>
                <middleName>A.</middleName>
                <lastName>Costa</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 Old Danbury Road</street1>
                <city>Wilton</city>
                <stateOrCountry>CT</stateOrCountry>
                <stateOrCountryDescription>CONNECTICUT</stateOrCountryDescription>
                <zipCode>06897-0812</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Verne</firstName>
                <middleName>O.</middleName>
                <lastName>Sedlacek</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 Old Danbury Road</street1>
                <city>Wilton</city>
                <stateOrCountry>CT</stateOrCountry>
                <stateOrCountryDescription>CONNECTICUT</stateOrCountryDescription>
                <zipCode>06897-0812</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Lyn</firstName>
                <lastName>Hutton</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 Old Danbury Road</street1>
                <city>Wilton</city>
                <stateOrCountry>CT</stateOrCountry>
                <stateOrCountryDescription>CONNECTICUT</stateOrCountryDescription>
                <zipCode>06897-0812</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <middleName>W.</middleName>
                <lastName>Auchincloss</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>15 Old Danbury Road</street1>
                <city>Wilton</city>
                <stateOrCountry>CT</stateOrCountry>
                <stateOrCountryDescription>CONNECTICUT</stateOrCountryDescription>
                <zipCode>06897-0812</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Private Equity Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <revenueRange>No Revenues</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
            <item>3C</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001456962-10-000001</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2009-01-30</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>Commonfund Securities, Inc.</recipientName>
                <recipientCRDNumber>43541</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>15 Old Danbury Road</street1>
                    <city>Wilton</city>
                    <stateOrCountry>CT</stateOrCountry>
                    <stateOrCountryDescription>CONNECTICUT</stateOrCountryDescription>
                    <zipCode>06897-0812</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>450000000</totalOfferingAmount>
            <totalAmountSold>272900000</totalAmountSold>
            <totalRemaining>177100000</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>84</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
                <isEstimate>true</isEstimate>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse>Commonfund Securities, Inc. will receive compensation equal to a portion of its expenses plus an additional percentage.</clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse>Fairfield Partners 2009 L.P. will receive a management fee payable by the Issuer quarterly in advance.  The management fee will be equal to a percentage of aggregate capital commitments to the Issuer as specified in the Issuer's partnership agreement.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>COMMONFUND CAPITAL VENTURE PARTNERS IX LP</issuerName>
                <signatureName>/s/ Linda A. Costa</signatureName>
                <nameOfSigner>Linda A. Costa</nameOfSigner>
                <signatureTitle>CFO of the GP of the GP of the Issuer</signatureTitle>
                <signatureDate>2010-06-15</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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