-----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,
 AwZJfbwWqgZlpABWS0rtnTnbP1VsMlM47Mk0qnWzXlr7cLzwGBq4LwJz9dYD/HMx
 RObjYKkoyXKHDWXjyAuRgQ==

<SEC-DOCUMENT>0001474533-09-000001.txt : 20091016
<SEC-HEADER>0001474533-09-000001.hdr.sgml : 20091016
<ACCEPTANCE-DATETIME>20091015194118
ACCESSION NUMBER:		0001474533-09-000001
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20091016
DATE AS OF CHANGE:		20091015
EFFECTIVENESS DATE:		20091016

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OSIsoft, LLC
		CENTRAL INDEX KEY:			0001474533
		IRS NUMBER:				942690532
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-135373
		FILM NUMBER:		091122249

	BUSINESS ADDRESS:	
		STREET 1:		777 DAVIS ST., SUITE 250
		CITY:			SAN LEANDRO
		STATE:			CA
		ZIP:			94577
		BUSINESS PHONE:		510-297-5800

	MAIL ADDRESS:	
		STREET 1:		777 DAVIS ST., SUITE 250
		CITY:			SAN LEANDRO
		STATE:			CA
		ZIP:			94577
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0603</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001474533</cik>
        <entityName>OSIsoft, LLC</entityName>
        <issuerAddress>
            <street1>777 DAVIS ST., SUITE 250</street1>
            <city>SAN LEANDRO</city>
            <stateOrCountry>CA</stateOrCountry>
            <zipCode>94577</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>510-297-5800</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <previousName>tfosISO, LLC</previousName>
            <previousName>OSIsoft, Inc.</previousName>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Liability Company</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2009</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <lastName>Estudillo Holdings Corp</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>777 Davis St., Suite 250</street1>
                <city>San Leandro</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94577</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Estudillo Holdings Corp. is the sole member and manager of OSIsoft, LLC</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Other Technology</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2009-08-10</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>true</isBusinessCombinationTransaction>
            <clarificationOfResponse>tfosISO, LLC, a CA LLC, was converted into OSIsoft, LLC, a DE LLC, which is issuing its sole membership interest to Estudillo Holdings Corp. who was the sole member of tfosISO, LLC.</clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>450000000</totalOfferingAmount>
            <totalAmountSold>450000000</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>1</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>OSIsoft, LLC</issuerName>
                <signatureName>/s/ Jennifer Linton</signatureName>
                <nameOfSigner>Jennifer Linton</nameOfSigner>
                <signatureTitle>CFO, Estudillo Holdings Corp., Sole Member and Manager</signatureTitle>
                <signatureDate>2009-09-10</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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