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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 RRhI6Rt9st8VDsnUxECYKw1qGWkwkQ18B8JA5skMnM66dnFP3rDb2oHiki564l22
 PrhRs3n5c+fhcoRIvrybtQ==

<SEC-DOCUMENT>0001053517-10-000001.txt : 20100316
<SEC-HEADER>0001053517-10-000001.hdr.sgml : 20100316
<ACCEPTANCE-DATETIME>20100316113724
ACCESSION NUMBER:		0001053517-10-000001
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)(1)
FILED AS OF DATE:		20100316
DATE AS OF CHANGE:		20100316
EFFECTIVENESS DATE:		20100316

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PECONIC GRENADIER FUND L.P.
		CENTRAL INDEX KEY:			0001053517
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-129252
		FILM NUMBER:		10684270

	BUSINESS ADDRESS:	
		STREET 1:		506 MONTAUK HIGHWAY, P.O. BOX 3002
		CITY:			EAST QUOGUE
		STATE:			NY
		ZIP:			11942
		BUSINESS PHONE:		212-904-0445

	MAIL ADDRESS:	
		STREET 1:		506 MONTAUK HIGHWAY, P.O. BOX 3002
		CITY:			EAST QUOGUE
		STATE:			NY
		ZIP:			11942

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GRENADIER FUND
		DATE OF NAME CHANGE:	19980122
</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>0001053517</cik>
        <entityName>PECONIC GRENADIER FUND L.P.</entityName>
        <issuerAddress>
            <street1>506 MONTAUK HIGHWAY</street1>
            <street2>BOX 3002</street2>
            <city>EAST QUOGUE</city>
            <stateOrCountry>NY</stateOrCountry>
            <zipCode>11942</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>212-904-0445</issuerPhoneNumber>
        <jurisdictionOfInc>NEW YORK</jurisdictionOfInc>
        <edgarPreviousNameList>
            <previousName>GRENADIER FUND</previousName>
        </edgarPreviousNameList>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <middleName>F.</middleName>
                <lastName>Harnisch</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>506 Montauk Highway</street1>
                <street2>Box 3002</street2>
                <city>East Quogue</city>
                <stateOrCountry>NY</stateOrCountry>
                <zipCode>11942</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Wook</firstName>
                <lastName>Lee</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>506 Montauk Highway</street1>
                <street2>Box 3002</street2>
                <city>East Quogue</city>
                <stateOrCountry>NY</stateOrCountry>
                <zipCode>11942</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>Over $100,000,000</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
            <item>3C</item>
            <item>3C.1</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001053517-09-000004</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>1986-07-01</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>100000</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>Harold K. Cohen</recipientName>
                <recipientCRDNumber>49888</recipientCRDNumber>
                <associatedBDName>HKC Securities, Inc.</associatedBDName>
                <associatedBDCRDNumber>29705</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>230 Park Ave.</street1>
                    <city>New York</city>
                    <stateOrCountry>NY</stateOrCountry>
                    <zipCode>10169</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>436234000</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse>The dollar amount disclosed above represents the Issuer's approximate net asset value as of January 31, 2010.  The number of investors disclosed below in Item 14 represents the historic total number of purchasers in the Issuer to date.</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>true</hasNonAccreditedInvestors>
            <numberNonAccreditedInvestors>0</numberNonAccreditedInvestors>
            <totalNumberAlreadyInvested>83</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>14610</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse>The dollar amount disclosed above represents the approximate sales commission since inception.  This commission was paid outside the Issuer by the Investment Advisor.</clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>7003293</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>PECONIC GRENADIER FUND L.P.</issuerName>
                <signatureName>Wook Lee</signatureName>
                <nameOfSigner>Wook Lee</nameOfSigner>
                <signatureTitle>Chief Compliance Officer, Chief Operating Officer and CTO</signatureTitle>
                <signatureDate>2010-03-16</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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