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            <city>MENLO PARK</city>
            <stateOrCountry>CA</stateOrCountry>
            <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
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            <entityName>Strategic Investors Fund X Master, L.P.</entityName>
            <issuerAddress>
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                <city>MENLO PARK</city>
                <stateOrCountry>CA</stateOrCountry>
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        <issuer>
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            <entityName>Strategic Investors Fund X-B, L.P.</entityName>
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                <stateOrCountry>CA</stateOrCountry>
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                <zipCode>94025</zipCode>
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        <issuer>
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            <issuerAddress>
                <street1>2770 SAND HILL ROAD</street1>
                <city>MENLO PARK</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
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            <issuerPhoneNumber>650-926-0100</issuerPhoneNumber>
            <jurisdictionOfInc>CAYMAN ISLANDS</jurisdictionOfInc>
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            <entityName>Strategic Investors Fund X-A Cayman, L.P.</entityName>
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                <street1>2770 SAND HILL ROAD</street1>
                <city>MENLO PARK</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94025</zipCode>
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        <issuer>
            <cik>0001810904</cik>
            <entityName>Strategic Investors Fund X Ontario, L.P.</entityName>
            <issuerAddress>
                <street1>2770 SAND HILL ROAD</street1>
                <city>MENLO PARK</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94025</zipCode>
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            <issuerPhoneNumber>650-926-0100</issuerPhoneNumber>
            <jurisdictionOfInc>ONTARIO, CANADA</jurisdictionOfInc>
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    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <middleName>N/A</middleName>
                <lastName>SVB Strategic Investors X, LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2770 Sand Hill Road</street1>
                <city>Menlo Park</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94025</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General Partner to the Issuers (the &quot;General Partner&quot;)</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <middleName>N/A</middleName>
                <lastName>SVB Financial Group</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2770 Sand Hill Road</street1>
                <city>Menlo Park</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94025</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>A Managing Director of the General Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Sulu</firstName>
                <lastName>Mamdani</lastName>
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            <relatedPersonAddress>
                <street1>2770 Sand Hill Road</street1>
                <city>Menlo Park</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94025</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>A Managing Director of the General Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Aaron</firstName>
                <lastName>Gershenberg</lastName>
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            <relatedPersonAddress>
                <street1>2770 Sand Hill Road</street1>
                <city>Menlo Park</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94025</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>A Managing Director of the General Partner</relationshipClarification>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Beau</firstName>
                <lastName>Laskey</lastName>
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            <relatedPersonAddress>
                <street1>2770 Sand Hill Road</street1>
                <city>Menlo Park</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94025</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
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            <relationshipClarification>A Managing Director of the General Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <lastName>China</lastName>
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            <relatedPersonAddress>
                <street1>2770 Sand Hill Road</street1>
                <city>Menlo Park</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94025</zipCode>
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            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
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            <relationshipClarification>A Managing Director of the General Partner</relationshipClarification>
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    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Venture Capital Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <revenueRange>Not Applicable</revenueRange>
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        <federalExemptionsExclusions>
            <item>06c</item>
            <item>3C</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001791392-20-000007</previousAccessionNumber>
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            <dateOfFirstSale>
                <value>2020-06-05</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
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        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>1015550000</totalOfferingAmount>
            <totalAmountSold>1015550000</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse>The Total Offering Amount and the Total Amount Sold each include $638,150,000 of securities that were sold pursuant to offerings that relied on the exemption provided by Rule 506(b) and that occurred on or prior to May 8, 2020.</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>219</totalNumberAlreadyInvested>
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        <salesCommissionsFindersFees>
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                <dollarAmount>0</dollarAmount>
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            <findersFees>
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            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse>The Issuers are obligated to pay a management fee to the General Partner (or an affiliate thereof).</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Strategic Investors Fund X, L.P.</issuerName>
                <signatureName>/s/ John China</signatureName>
                <nameOfSigner>John China</nameOfSigner>
                <signatureTitle>A Managing Director of the General Partner</signatureTitle>
                <signatureDate>2020-12-09</signatureDate>
            </signature>
            <signature>
                <issuerName>Strategic Investors Fund X Master, L.P.</issuerName>
                <signatureName>/s/ John China</signatureName>
                <nameOfSigner>John China</nameOfSigner>
                <signatureTitle>A Managing Director of the General Partner</signatureTitle>
                <signatureDate>2020-12-09</signatureDate>
            </signature>
            <signature>
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                <signatureName>/s/ John China</signatureName>
                <nameOfSigner>John China</nameOfSigner>
                <signatureTitle>A Managing Director of the General Partner</signatureTitle>
                <signatureDate>2020-12-09</signatureDate>
            </signature>
            <signature>
                <issuerName>Strategic Investors Fund X-B, L.P.</issuerName>
                <signatureName>/s/ John China</signatureName>
                <nameOfSigner>John China</nameOfSigner>
                <signatureTitle>A Managing Director of the General Partner</signatureTitle>
                <signatureDate>2020-12-09</signatureDate>
            </signature>
            <signature>
                <issuerName>Strategic Investors Fund X Cayman, L.P.</issuerName>
                <signatureName>/s/ John China</signatureName>
                <nameOfSigner>John China</nameOfSigner>
                <signatureTitle>A Managing Director of the General Partner</signatureTitle>
                <signatureDate>2020-12-09</signatureDate>
            </signature>
            <signature>
                <issuerName>Strategic Investors Fund X-A Cayman, L.P.</issuerName>
                <signatureName>/s/ John China</signatureName>
                <nameOfSigner>John China</nameOfSigner>
                <signatureTitle>A Managing Director of the General Partner</signatureTitle>
                <signatureDate>2020-12-09</signatureDate>
            </signature>
            <signature>
                <issuerName>Strategic Investors Fund X Ontario, L.P.</issuerName>
                <signatureName>/s/ John China</signatureName>
                <nameOfSigner>John China</nameOfSigner>
                <signatureTitle>A Managing Director of the General Partner</signatureTitle>
                <signatureDate>2020-12-09</signatureDate>
            </signature>
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