<SEC-DOCUMENT>0001969223-24-000251.txt : 20240311
<SEC-HEADER>0001969223-24-000251.hdr.sgml : 20240311
<ACCEPTANCE-DATETIME>20240311161232
ACCESSION NUMBER:		0001969223-24-000251
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20240311
DATE AS OF CHANGE:		20240311

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			REPLIGEN CORP
		CENTRAL INDEX KEY:			0000730272
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				042729386
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	000-14656
		FILM NUMBER:		24738121

	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

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KURIYEL RALF
		CENTRAL INDEX KEY:			0001733143
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		41 SEYON ST
		STREET 2:		BLDG 1, STE. 100
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02452
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001733143</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000730272</issuerCik>
      <issuerName>Repligen Corporation</issuerName>
      <secFileNumber>000-14656</secFileNumber>
      <issuerAddress>
        <com:street1>41 Seyon Street, Building 1</com:street1>
        <com:street2>Suite 100</com:street2>
        <com:city>Waltham</com:city>
        <com:stateOrCountry>MA</com:stateOrCountry>
        <com:zipCode>02453</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>7812500111</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Ralf Kuriyel</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>UBS Financial Services Inc</name>
        <address>
          <com:street1>1000 Harbor Blvd</com:street1>
          <com:street2>3rd Floor</com:street2>
          <com:city>Weehawken</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07086</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>3517</noOfUnitsSold>
      <aggregateMarketValue>681348.41</aggregateMarketValue>
      <noOfUnitsOutstanding>55771075</noOfUnitsOutstanding>
      <approxSaleDate>03/11/2024</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/13/2021</acquiredDate>
      <natureOfAcquisitionTransaction>RSU Vesting Event</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer / Repligen Inc</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>890</amountOfSecuritiesAcquired>
      <paymentDate>03/11/2024</paymentDate>
      <natureOfPayment>na</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/13/2022</acquiredDate>
      <natureOfAcquisitionTransaction>RSU Vesting Event</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer / Repligen Inc</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>888</amountOfSecuritiesAcquired>
      <paymentDate>03/11/2024</paymentDate>
      <natureOfPayment>NA</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>02/24/2023</acquiredDate>
      <natureOfAcquisitionTransaction>RSU Vesting Event</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer / Repligen Inc</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>468</amountOfSecuritiesAcquired>
      <paymentDate>03/11/2024</paymentDate>
      <natureOfPayment>NA</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/11/2024</acquiredDate>
      <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer / Repligen Inc</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1271</amountOfSecuritiesAcquired>
      <paymentDate>03/11/2024</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <remarks>Under "Securities to be Sold", the three "RSU Vesting Event" should have the value under "Date of Payment" changed to "Not Applicable." The date listed does not apply. Due to application limitations of filing the form on this system, I am forced to enter a date rather than enter "NA."</remarks>
    <noticeSignature>
      <noticeDate>03/11/2024</noticeDate>
      <signature>/s/ UBS Financial Services Inc, as attorney-in-fact for Ralf Kuriyel</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
