-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 KHYlUWWErXz/EzZh8xFh20abYK237djSMZjeAyK0Vx6bReJDgtO2mR9A03tvOMqD
 sNXm7bVWxctLXYgYn81duA==

<SEC-DOCUMENT>0001053517-09-000004.txt : 20091104
<SEC-HEADER>0001053517-09-000004.hdr.sgml : 20091104
<ACCEPTANCE-DATETIME>20091104172909
ACCESSION NUMBER:		0001053517-09-000004
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:		20091104
DATE AS OF CHANGE:		20091104
EFFECTIVENESS DATE:		20091104

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:		091158760

	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, P.O. BOX 3002</street1>
            <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>n/a</firstName>
                <lastName>Peconic Partners LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>506 Montauk Highway</street1>
                <street2>P.O. Box 3002</street2>
                <city>East Quogue</city>
                <stateOrCountry>NY</stateOrCountry>
                <zipCode>11942</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Investment Adviser of the Issuer.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>n/a</firstName>
                <lastName>Peconic Asset Managers LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>506 Montauk Highway</street1>
                <street2>P.O. Box 3002</street2>
                <city>East Quogue</city>
                <stateOrCountry>NY</stateOrCountry>
                <zipCode>11942</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General Partner of the Issuer.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <middleName>F.</middleName>
                <lastName>Harnisch</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>506 Montauk Highway</street1>
                <street2>P.O. 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>9999999997-09-013754</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>
            <recipient>
                <recipientName>Thomas R. Moore</recipientName>
                <recipientCRDNumber>None</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>Suite 900, 730 Fifth Avenue</street1>
                    <city>New York</city>
                    <stateOrCountry>NY</stateOrCountry>
                    <zipCode>10019</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>420622002</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>82</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>11000</dollarAmount>
                <isEstimate>true</isEstimate>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>6926257</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>2009-11-04</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----