<SEC-DOCUMENT>0001214659-20-001478-index.html : 20200214
<SEC-HEADER>0001214659-20-001478.hdr.sgml : 20200214
<ACCEPTANCE-DATETIME>20200214160011
ACCESSION NUMBER:		0001214659-20-001478
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20200214
DATE AS OF CHANGE:		20200214

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
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-88225
		FILM NUMBER:		20619100

	BUSINESS ADDRESS:	
		STREET 1:		3 CENTER PLAZA
		STREET 2:		SUITE 610
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02108
		BUSINESS PHONE:		617-622-4003

	MAIL ADDRESS:	
		STREET 1:		3 CENTER PLAZA
		STREET 2:		SUITE 610
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02108

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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Sio Capital Management, LLC
		CENTRAL INDEX KEY:			0001482416
		IRS NUMBER:				204586565
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		535 FIFTH AVENUE
		STREET 2:		SUITE 910
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
		BUSINESS PHONE:		212-601-9786

	MAIL ADDRESS:	
		STREET 1:		535 FIFTH AVENUE
		STREET 2:		SUITE 910
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>p24202sc13g.htm
<DESCRIPTION>ZAFGEN
<TEXT>
Document 1 - file: p24202sc13g.htm

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

</DOCUMENT>
</SEC-DOCUMENT>