<SEC-DOCUMENT>0001193125-16-457607-index.html : 20160210
<SEC-HEADER>0001193125-16-457607.hdr.sgml : 20160210
<ACCEPTANCE-DATETIME>20160210161859
ACCESSION NUMBER:		0001193125-16-457607
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20160210
DATE AS OF CHANGE:		20160210
GROUP MEMBERS:		KEVIN P. STARR
GROUP MEMBERS:		MARK LEVIN
GROUP MEMBERS:		ROBERT I. TEPPER
GROUP MEMBERS:		THIRD ROCK VENTURES GP, L.P.
GROUP MEMBERS:		TRV GP, LLC

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ZAFGEN, INC.
		CENTRAL INDEX KEY:			0001374690
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				203857670
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-88225
		FILM NUMBER:		161405961

	BUSINESS ADDRESS:	
		STREET 1:		175 PORTLAND STREET
		STREET 2:		4TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02114
		BUSINESS PHONE:		617-622-4003

	MAIL ADDRESS:	
		STREET 1:		175 PORTLAND STREET
		STREET 2:		4TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02114

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ZAFGEN INC
		DATE OF NAME CHANGE:	20060906

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			THIRD ROCK VENTURES LP
		CENTRAL INDEX KEY:			0001408591
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		29 NEWBURY STREET
		STREET 2:		SUITE 401
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		617-859-3099

	MAIL ADDRESS:	
		STREET 1:		29 NEWBURY STREET
		STREET 2:		SUITE 401
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>d56202dsc13ga.htm
<DESCRIPTION>SC 13G/A
<TEXT>
Document 1 - file: d56202dsc13ga.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>d56202dex24.htm
<DESCRIPTION>EX-24
<TEXT>
Document 2 - file: d56202dex24.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>3
<FILENAME>d56202dex991.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 3 - file: d56202dex991.htm

</DOCUMENT>
</SEC-DOCUMENT>