-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
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 wKdYcrOmJTOkNJ9cFyNrgQ==

<SEC-DOCUMENT>0001181431-09-033363.txt : 20090702
<SEC-HEADER>0001181431-09-033363.hdr.sgml : 20090702
<ACCEPTANCE-DATETIME>20090701191845
ACCESSION NUMBER:		0001181431-09-033363
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20090702
DATE AS OF CHANGE:		20090701
EFFECTIVENESS DATE:		20090702

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SEA Venture Capital Fund - Plextronics Series B-1, L.P.
		CENTRAL INDEX KEY:			0001466945
		IRS NUMBER:				264830890
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-132395
		FILM NUMBER:		09924033

	BUSINESS ADDRESS:	
		STREET 1:		20 STANWIX STREET
		STREET 2:		SUITE 650
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15222
		BUSINESS PHONE:		412-261-0779

	MAIL ADDRESS:	
		STREET 1:		20 STANWIX STREET
		STREET 2:		SUITE 650
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15222
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0401</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001466945</cik>
        <entityName>SEA Venture Capital Fund - Plextronics Series B-1, L.P.</entityName>
        <issuerAddress>
            <street1>20 Stanwix Street</street1>
            <street2>Suite 650</street2>
            <city>Pittsburgh</city>
            <stateOrCountry>PA</stateOrCountry>
            <zipCode>15222</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>412-261-0779</issuerPhoneNumber>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <jurisdictionOfInc>PENNSYLVANIA</jurisdictionOfInc>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2009</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Mark</firstName>
                <middleName></middleName>
                <lastName>McDonel</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Smithfield Equity Associates LLC</street1>
                <street2>20 Stanwix Street, Suite 650</street2>
                <city>Pittsburgh</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>15222</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName></firstName>
                <middleName></middleName>
                <lastName>Smithfield Equity Associates LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>20 Stanwix Street</street1>
                <street2>Suite 650</street2>
                <city>Pittsburgh</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>15222</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General and Managing Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Robert</firstName>
                <middleName></middleName>
                <lastName>Kopf</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Smithfield Equity Associates LLC</street1>
                <street2>20 Stanwix Street, Suite 650</street2>
                <city>Pittsburgh</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>15222</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <middleName></middleName>
                <lastName>Morrow</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Smithfield Equity Associates LLC</street1>
                <street2>20 Stanwix Street, Suite 650</street2>
                <city>Pittsburgh</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>15222</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Douglas</firstName>
                <middleName></middleName>
                <lastName>Sherratt</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Smithfield Equity Associates LLC</street1>
                <street2>20 Stanwix Street, Suite 650</street2>
                <city>Pittsburgh</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>15222</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Investing</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Not Applicable</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2009-06-22</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>3000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>523000</totalOfferingAmount>
            <totalAmountSold>323000</totalAmountSold>
            <totalRemaining>200000</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>9</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>SEA Venture Capital Fund - Plextronics Series B-1, L.P.</issuerName>
                <signatureName>/s/ Mark McDonel</signatureName>
                <nameOfSigner>Mark McDonel</nameOfSigner>
                <signatureTitle>Vice President</signatureTitle>
                <signatureDate>2009-06-29</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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