<SEC-DOCUMENT>0001193125-17-213455-index.html : 20170626
<SEC-HEADER>0001193125-17-213455.hdr.sgml : 20170626
<ACCEPTANCE-DATETIME>20170626172337
ACCESSION NUMBER:		0001193125-17-213455
CONFORMED SUBMISSION TYPE:	424B5
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20170626
DATE AS OF CHANGE:		20170626

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:		424B5
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-211436
		FILM NUMBER:		17930653

	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>424B5
<SEQUENCE>1
<FILENAME>d417422d424b5.htm
<DESCRIPTION>424B5
<TEXT>
Document 1 - file: d417422d424b5.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g417422g47g46.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g417422g47g46.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g417422g54m58.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g417422g54m58.jpg

</DOCUMENT>
</SEC-DOCUMENT>