<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001807998</cik>
        <entityName>ASP (Feeder) SPC II-B1 LP</entityName>
        <issuerAddress>
            <street1>C/O ADAMS STREET PARTNERS, LLC</street1>
            <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
            <city>CHICAGO</city>
            <stateOrCountry>IL</stateOrCountry>
            <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
            <zipCode>60606</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>312-553-7890</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2020</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <lastName>Adams Street Private Credit Fund II GP LP</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General partner of the Issuer (the &quot;General Partner&quot;)</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <lastName>Adams Street Private Credit Fund GP-GP LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General partner of the General Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <lastName>Adams Street Partners, LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>ONE NORTH WACKER DRIVE</street1>
                <street2>SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Member of the general partner of the General Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jeffrey</firstName>
                <middleName>B.</middleName>
                <lastName>Akers</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Adams Street Partners, LLC</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Timothy</firstName>
                <middleName>R.M.</middleName>
                <lastName>Bryant</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Adams Street Partners, LLC</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jeffrey</firstName>
                <middleName>T.</middleName>
                <lastName>Diehl</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Adams Street Partners, LLC</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>J.</firstName>
                <middleName>Gary</middleName>
                <lastName>Fencik</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Adams Street Partners, LLC</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Miguel</firstName>
                <lastName>Gonzalo</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Adams Street Partners, LLC</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Elisha</firstName>
                <middleName>P.</middleName>
                <lastName>Gould</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Adams Street Partners, LLC</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Quintin</firstName>
                <middleName>I.</middleName>
                <lastName>Kevin</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Adams Street Partners, LLC</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kelly</firstName>
                <lastName>Meldrum</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Adams Street Partners, LLC</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kevin</firstName>
                <lastName>O'Donnell</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Adams Street Partners, LLC</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>James</firstName>
                <lastName>Walker</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ADAMS STREET PARTNERS, LLC</street1>
                <street2>ONE NORTH WACKER DRIVE, SUITE 2700</street2>
                <city>CHICAGO</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive Officer of Adams Street Partners, LLC</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Other Investment Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <aggregateNetAssetValueRange>Decline to Disclose</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
            <item>3C</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <yetToOccur>true</yetToOccur>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isOtherType>true</isOtherType>
            <descriptionOfOtherType>Limited Partnership Interests</descriptionOfOtherType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>Equus Financial Consulting LLC</recipientName>
                <recipientCRDNumber>None</recipientCRDNumber>
                <associatedBDName>Equus Financial Consulting LLC</associatedBDName>
                <associatedBDCRDNumber>131449</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>78 Pine St., Suite 101</street1>
                    <city>New Canaan</city>
                    <stateOrCountry>CT</stateOrCountry>
                    <stateOrCountryDescription>CONNECTICUT</stateOrCountryDescription>
                    <zipCode>06840</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <state>AL</state>
                    <description>ALABAMA</description>
                    <state>AZ</state>
                    <description>ARIZONA</description>
                    <state>AR</state>
                    <description>ARKANSAS</description>
                    <state>CA</state>
                    <description>CALIFORNIA</description>
                    <state>CO</state>
                    <description>COLORADO</description>
                    <state>CT</state>
                    <description>CONNECTICUT</description>
                    <state>DE</state>
                    <description>DELAWARE</description>
                    <state>FL</state>
                    <description>FLORIDA</description>
                    <state>GA</state>
                    <description>GEORGIA</description>
                    <state>ID</state>
                    <description>IDAHO</description>
                    <state>IL</state>
                    <description>ILLINOIS</description>
                    <state>IN</state>
                    <description>INDIANA</description>
                    <state>IA</state>
                    <description>IOWA</description>
                    <state>KS</state>
                    <description>KANSAS</description>
                    <state>KY</state>
                    <description>KENTUCKY</description>
                    <state>LA</state>
                    <description>LOUISIANA</description>
                    <state>ME</state>
                    <description>MAINE</description>
                    <state>MD</state>
                    <description>MARYLAND</description>
                    <state>MA</state>
                    <description>MASSACHUSETTS</description>
                    <state>MI</state>
                    <description>MICHIGAN</description>
                    <state>MN</state>
                    <description>MINNESOTA</description>
                    <state>MS</state>
                    <description>MISSISSIPPI</description>
                    <state>MO</state>
                    <description>MISSOURI</description>
                    <state>MT</state>
                    <description>MONTANA</description>
                    <state>NV</state>
                    <description>NEVADA</description>
                    <state>NH</state>
                    <description>NEW HAMPSHIRE</description>
                    <state>NJ</state>
                    <description>NEW JERSEY</description>
                    <state>NM</state>
                    <description>NEW MEXICO</description>
                    <state>NY</state>
                    <description>NEW YORK</description>
                    <state>NC</state>
                    <description>NORTH CAROLINA</description>
                    <state>ND</state>
                    <description>NORTH DAKOTA</description>
                    <state>OH</state>
                    <description>OHIO</description>
                    <state>OK</state>
                    <description>OKLAHOMA</description>
                    <state>OR</state>
                    <description>OREGON</description>
                    <state>PA</state>
                    <description>PENNSYLVANIA</description>
                    <state>RI</state>
                    <description>RHODE ISLAND</description>
                    <state>SC</state>
                    <description>SOUTH CAROLINA</description>
                    <state>TN</state>
                    <description>TENNESSEE</description>
                    <state>TX</state>
                    <description>TEXAS</description>
                    <state>UT</state>
                    <description>UTAH</description>
                    <state>VA</state>
                    <description>VIRGINIA</description>
                    <state>WA</state>
                    <description>WASHINGTON</description>
                    <state>WV</state>
                    <description>WEST VIRGINIA</description>
                    <state>WI</state>
                    <description>WISCONSIN</description>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>0</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>0</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
                <isEstimate>true</isEstimate>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
                <isEstimate>true</isEstimate>
            </findersFees>
            <clarificationOfResponse>The entity listed in Item 12 will receive a fee for investors that are introduced to the Issuer and invest in the Issuer in an amount equal to a percentage of the investors' commitments to the Issuer.</clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>ASP (Feeder) SPC II-B1 LP</issuerName>
                <signatureName>/s/ Timothy R.M. Bryant</signatureName>
                <nameOfSigner>Timothy R.M. Bryant</nameOfSigner>
                <signatureTitle>Executive Vice President</signatureTitle>
                <signatureDate>2020-04-09</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
