<SEC-DOCUMENT>0001193125-18-123735-index.html : 20180420
<SEC-HEADER>0001193125-18-123735.hdr.sgml : 20180420
<ACCEPTANCE-DATETIME>20180420081433
ACCESSION NUMBER:		0001193125-18-123735
CONFORMED SUBMISSION TYPE:	DEF 14A
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20180516
FILED AS OF DATE:		20180420
DATE AS OF CHANGE:		20180420
EFFECTIVENESS DATE:		20180420

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:		DEF 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14656
		FILM NUMBER:		18765098

	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>
<DOCUMENT>
<TYPE>DEF 14A
<SEQUENCE>1
<FILENAME>d529721ddef14a.htm
<DESCRIPTION>DEF 14A
<TEXT>
Document 1 - file: d529721ddef14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g529721g11x62.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g529721g11x62.jpg

</DOCUMENT>
</SEC-DOCUMENT>