-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 HR62uQpWgzBN2dEkc9hbw91eDvRKQ72Z0iSP6fQHnakZ6xK2wCKdcSWasV81U00b
 xMefCK/E9ApSW6yU0nfIyA==

<SEC-DOCUMENT>0001481122-10-000002.txt : 20100115
<SEC-HEADER>0001481122-10-000002.hdr.sgml : 20100115
<ACCEPTANCE-DATETIME>20100115131537
ACCESSION NUMBER:		0001481122-10-000002
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:		20100115
DATE AS OF CHANGE:		20100115
EFFECTIVENESS DATE:		20100115

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Northern Trust Buyout (U.S.) Fund IV, L.P.
		CENTRAL INDEX KEY:			0001481122
		IRS NUMBER:				264048748
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-137893
		FILM NUMBER:		10529687

	BUSINESS ADDRESS:	
		STREET 1:		300 ATLANTIC STREET
		CITY:			STAMFORD
		STATE:			CT
		ZIP:			06901
		BUSINESS PHONE:		203-351-8700

	MAIL ADDRESS:	
		STREET 1:		300 ATLANTIC STREET
		CITY:			STAMFORD
		STATE:			CT
		ZIP:			06901
</SEC-HEADER>
<DOCUMENT>
<TYPE>D/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0603</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001481122</cik>
        <entityName>Northern Trust Buyout (U.S.) Fund IV, L.P.</entityName>
        <issuerAddress>
            <street1>300 ATLANTIC STREET</street1>
            <city>STAMFORD</city>
            <stateOrCountry>CT</stateOrCountry>
            <zipCode>06901</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>203-351-8700</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>Robert</firstName>
                <middleName>P</middleName>
                <lastName>Morgan</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>50 South LaSalle Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <zipCode>60675</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Bradley</firstName>
                <middleName>M.</middleName>
                <lastName>Dorchinez</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>50 South LaSalle Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <zipCode>60675</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>David</firstName>
                <middleName>K.</middleName>
                <lastName>McHugh</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>300 Atlantic Street</street1>
                <city>Stamford</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06901</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Steven</firstName>
                <middleName>A.</middleName>
                <lastName>Miller</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>300 Atlantic Street</street1>
                <city>Stamford</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06901</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>James</firstName>
                <middleName>D.</middleName>
                <lastName>McDonald</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>300 Atlantic Street</street1>
                <city>Stamford</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06901</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Richard</firstName>
                <middleName>C.</middleName>
                <lastName>Campbell</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>50 South LaSalle Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <zipCode>60675</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Andrew</firstName>
                <middleName>S.C.</middleName>
                <lastName>Smith</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>300 Atlantic Street</street1>
                <city>Stamford</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06901</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Joseph</firstName>
                <middleName>W.</middleName>
                <lastName>McInerney</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>50 South LaSalle Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <zipCode>60675</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <middleName>D.</middleName>
                <lastName>Skjervam</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>50 South LaSalle Street</street1>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <zipCode>60675</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>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
            <item>3C</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001481122-10-000001</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2009-08-25</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>250000</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>Northern Trust Securities, Inc.</recipientName>
                <recipientCRDNumber>7927</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>50 South LaSalle Street</street1>
                    <city>Chicago</city>
                    <stateOrCountry>IL</stateOrCountry>
                    <zipCode>60675</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>400000000</totalOfferingAmount>
            <totalAmountSold>22051000</totalAmountSold>
            <totalRemaining>377949000</totalRemaining>
            <clarificationOfResponse>The General Partner reserves the right to offer a greater or lesser amount of limited partner interests.</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>1</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>24000000</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse>Estimated aggregate amount for the first six years; thereafter the Issuer shall continue to pay management fees.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Northern Trust Buyout (U.S.) Fund IV, L.P.</issuerName>
                <signatureName>/s/ Steven A. Miller</signatureName>
                <nameOfSigner>Steven A. Miller</nameOfSigner>
                <signatureTitle>Senior Vice President of the General Partner of teh Issuer</signatureTitle>
                <signatureDate>2010-01-13</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----