-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 p1xKUl/d2pNsvLSRVv2gtw==

<SEC-DOCUMENT>0000902664-10-001713.txt : 20100311
<SEC-HEADER>0000902664-10-001713.hdr.sgml : 20100311
<ACCEPTANCE-DATETIME>20100310190537
ACCESSION NUMBER:		0000902664-10-001713
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)(7)
FILED AS OF DATE:		20100311
DATE AS OF CHANGE:		20100310
EFFECTIVENESS DATE:		20100311

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Boston Co. Microcap Portfolio
		CENTRAL INDEX KEY:			0001350471
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-85324
		FILM NUMBER:		10671932

	BUSINESS ADDRESS:	
		STREET 1:		C/O WALKERS SVP, LTD., WALKER HOUSE
		STREET 2:		87 MARY STREET, P.O. BOX 908 GT
		CITY:			GEORGE TOWN, GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-9002
		BUSINESS PHONE:		(345) 914-4276

	MAIL ADDRESS:	
		STREET 1:		C/O WALKERS SVP, LTD., WALKER HOUSE
		STREET 2:		87 MARY STREET, P.O. BOX 908 GT
		CITY:			GEORGE TOWN, GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-9002

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Boston Co Microcap Portfolio
		DATE OF NAME CHANGE:	20100219

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BOSTON CO MICROCAP PORTFOLIO
		DATE OF NAME CHANGE:	20060120
</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>0001350471</cik>
        <entityName>Boston Co. Microcap Portfolio</entityName>
        <issuerAddress>
            <street1>C/O WALKERS SVP, LTD., WALKER HOUSE</street1>
            <street2>87 MARY STREET, P.O. BOX 908 GT</street2>
            <city>GEORGE TOWN, GRAND CAYMAN</city>
            <stateOrCountry>E9</stateOrCountry>
            <zipCode>KY1-9002</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>(345) 914-4276</issuerPhoneNumber>
        <jurisdictionOfInc>CAYMAN ISLANDS</jurisdictionOfInc>
        <issuerPreviousNameList></issuerPreviousNameList>
        <edgarPreviousNameList>
            <previousName>Boston Co Microcap Portfolio</previousName>
            <previousName>BOSTON CO MICROCAP PORTFOLIO</previousName>
        </edgarPreviousNameList>
        <entityType>Business Trust</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2005</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Walkers SPV Limited</firstName>
                <lastName>Walkers SPV Limited</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Mary Street, P.O. Box 908 GT</street1>
                <city>Grand Cayman</city>
                <stateOrCountry>E9</stateOrCountry>
                <zipCode>KY1-9001</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Trustee</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>The Boston Company Asset Mgmt., LLC</firstName>
                <lastName>The Boston Company Asset Mgmt., LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>One Boston Place, Suite 1400</street1>
                <city>Boston</city>
                <stateOrCountry>MA</stateOrCountry>
                <zipCode>02108</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Investment Manager</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Randall</firstName>
                <middleName>B.</middleName>
                <lastName>Watts, Jr.</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>One Boston Place, Suite 1400</street1>
                <city>Boston</city>
                <stateOrCountry>MA</stateOrCountry>
                <zipCode>02108</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Senior Managing Director of the Investment Manager</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Todd</firstName>
                <middleName>W.</middleName>
                <lastName>Wakefield</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>One Boston Place, Suite 1400</street1>
                <city>Boston</city>
                <stateOrCountry>MA</stateOrCountry>
                <zipCode>02108</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Managing Director of the Investment Manager</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>P.</firstName>
                <middleName>Hans</middleName>
                <lastName>von der Luft</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>One Boston Place, Suite 1400</street1>
                <city>Boston</city>
                <stateOrCountry>MA</stateOrCountry>
                <zipCode>02108</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of the Investment Manager</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Robert</firstName>
                <middleName>C.</middleName>
                <lastName>Zeuthen</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>One Boston Place, Suite 1400</street1>
                <city>Boston</city>
                <stateOrCountry>MA</stateOrCountry>
                <zipCode>02108</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of the Investment Manager</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Charles</firstName>
                <lastName>Trafton</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>One Boston Place, Suite 1400</street1>
                <city>Boston</city>
                <stateOrCountry>MA</stateOrCountry>
                <zipCode>02108</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of the Investment Manager</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Stephen</firstName>
                <middleName>D.</middleName>
                <lastName>Ladner</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>One Boston Place, Suite 1400</street1>
                <city>Boston</city>
                <stateOrCountry>MA</stateOrCountry>
                <zipCode>02108</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Vice President of the Investment Manager</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Hedge Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <aggregateNetAssetValueRange>Decline to Disclose</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
            <item>3C</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>9999999997-09-011624</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2007-10-01</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>50000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>400000000</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>2</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse>The fund charges a management fee that is described in the fund's offering documents.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Boston Co. Microcap Portfolio</issuerName>
                <signatureName>/s/ Scott Lennon</signatureName>
                <nameOfSigner>Scott Lennon</nameOfSigner>
                <signatureTitle>Senior Vice President</signatureTitle>
                <signatureDate>2010-03-08</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----