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        <entityName>SummitTX Pinnacle (Offshore), L.P.</entityName>
        <issuerAddress>
            <street1>Walkers Corporate Limited</street1>
            <street2>190 Elgin Avenue</street2>
            <city>George Town, Grand Cayman</city>
            <stateOrCountry>E9</stateOrCountry>
            <stateOrCountryDescription>CAYMAN ISLANDS</stateOrCountryDescription>
            <zipCode>KY1-9008</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>345-949-0100</issuerPhoneNumber>
        <jurisdictionOfInc>CAYMAN ISLANDS</jurisdictionOfInc>
        <edgarPreviousNameList>
            <previousName>Crestline Summit Pinnacle (Offshore), L.P.</previousName>
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        <entityType>Other</entityType>
        <entityTypeOtherDesc>Cayman Islands Exempted Limited Partnership</entityTypeOtherDesc>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2022</value>
        </yearOfInc>
    </primaryIssuer>

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                <lastName>SummitTX Pinnacle (GP), L.P.</lastName>
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            <relatedPersonAddress>
                <street1>201 Main Street, Suite 1900</street1>
                <city>Fort Worth</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>76102</zipCode>
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            <relationshipClarification>General Partner</relationshipClarification>
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        <relatedPersonInfo>
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                <lastName>SummitTX Capital, L.P.</lastName>
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                <city>Fort Worth</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>76102</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
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            <relationshipClarification>Investment Manager</relationshipClarification>
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                <firstName>Douglas</firstName>
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                <lastName>Bratton</lastName>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Caroline</firstName>
                <middleName>A.</middleName>
                <lastName>Cooley</lastName>
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                <firstName>Neilson</firstName>
                <lastName>Arbour</lastName>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Alex</firstName>
                <lastName>Didych</lastName>
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        <relatedPersonInfo>
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    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Hedge Fund</investmentFundType>
                <is40Act>false</is40Act>
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        </industryGroup>
        <issuerSize>
            <aggregateNetAssetValueRange>Decline to Disclose</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
            <item>3C</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001963568-25-000002</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2024-06-01</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>100000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>288168718</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>8</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
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                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
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            <clarificationOfResponse></clarificationOfResponse>
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        <useOfProceeds>
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            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>SummitTX Pinnacle (Offshore), L.P.</issuerName>
                <signatureName>Caroline A. Cooley</signatureName>
                <nameOfSigner>Caroline A. Cooley</nameOfSigner>
                <signatureTitle>Chief Investment Officer of the Investment Manager</signatureTitle>
                <signatureDate>2026-04-03</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
