<SEC-DOCUMENT>0001209191-17-048097.txt : 20170808
<SEC-HEADER>0001209191-17-048097.hdr.sgml : 20170808
<ACCEPTANCE-DATETIME>20170808163120
ACCESSION NUMBER:		0001209191-17-048097
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		<ITEMS>06b
FILED AS OF DATE:		20170808
DATE AS OF CHANGE:		20170808
EFFECTIVENESS DATE:		20170808

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			REPLIGEN CORP
		CENTRAL INDEX KEY:			0000730272
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				042729386
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-292364
		FILM NUMBER:		171015238

	BUSINESS ADDRESS:	
		STREET 1:		41 SEYON STREET
		STREET 2:		BUILDING 1, SUITE 100
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02453
		BUSINESS PHONE:		7814499560

	MAIL ADDRESS:	
		STREET 1:		41 SEYON STREET
		STREET 2:		BUILDING 1, SUITE 100
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02453
</SEC-HEADER>
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            <city>Waltham</city>
            <stateOrCountry>MA</stateOrCountry>
            <stateOrCountryDescription>MASSACHUSETTS</stateOrCountryDescription>
            <zipCode>02453</zipCode>
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        <issuerPhoneNumber>(781) 250-0111</issuerPhoneNumber>
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                <lastName>Hunt</lastName>
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                <relationship>Executive Officer</relationship>
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                <firstName>Jon</firstName>
                <middleName>K.</middleName>
                <lastName>Snodgres</lastName>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Glenn</firstName>
                <middleName>L.</middleName>
                <lastName>Cooper</lastName>
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            <relatedPersonAddress>
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                <lastName>Barthelemy</lastName>
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                <firstName>Karen</firstName>
                <middleName>A.</middleName>
                <lastName>Dawes</lastName>
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                <zipCode>02453</zipCode>
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    <offeringData>
        <industryGroup>
            <industryGroupType>Other Health Care</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2017-08-01</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>true</isBusinessCombinationTransaction>
            <clarificationOfResponse>Private Sale part of consideration for Repligen Corporation's acquisition of Spectrum, Inc.</clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>238590580</totalOfferingAmount>
            <totalAmountSold>238590580</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>8</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
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                <dollarAmount>0</dollarAmount>
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        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>REPLIGEN CORP</issuerName>
                <signatureName>/s/ Jon K. Snodgres</signatureName>
                <nameOfSigner>Jon K. Snodgres</nameOfSigner>
                <signatureTitle>Chief Financial Officer</signatureTitle>
                <signatureDate>2017-08-07</signatureDate>
            </signature>
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