<SEC-DOCUMENT>0001193125-17-217346-index.html : 20170629
<SEC-HEADER>0001193125-17-217346.hdr.sgml : 20170629
<ACCEPTANCE-DATETIME>20170629061402
ACCESSION NUMBER:		0001193125-17-217346
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		6
CONFORMED PERIOD OF REPORT:	20170627
ITEM INFORMATION:		Entry into a Material Definitive Agreement
ITEM INFORMATION:		Other Events
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20170629
DATE AS OF CHANGE:		20170629

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:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14656
		FILM NUMBER:		17936705

	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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<TYPE>8-K
<SEQUENCE>1
<FILENAME>d398050d8k.htm
<DESCRIPTION>8-K
<TEXT>
Document 1 - file: d398050d8k.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-1.1
<SEQUENCE>2
<FILENAME>d398050dex11.htm
<DESCRIPTION>EX-1.1
<TEXT>
Document 2 - file: d398050dex11.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>3
<FILENAME>d398050dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 3 - file: d398050dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>4
<FILENAME>d398050dex991.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 4 - file: d398050dex991.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g398050g0628101832774.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g398050g0628101832774.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g398050g12y31.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g398050g12y31.gif

</DOCUMENT>
</SEC-DOCUMENT>