<SEC-DOCUMENT>0000899243-18-008660-index.html : 20180327
<SEC-HEADER>0000899243-18-008660.hdr.sgml : 20180327
<ACCEPTANCE-DATETIME>20180327182624
ACCESSION NUMBER:		0000899243-18-008660
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180327
FILED AS OF DATE:		20180327
DATE AS OF CHANGE:		20180327

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Rock Springs Capital LLC
		CENTRAL INDEX KEY:			0001735397
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38433
		FILM NUMBER:		18716651

	BUSINESS ADDRESS:	
		STREET 1:		650 SOUTH EXETER STREET
		STREET 2:		SUITE 1070
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21202
		BUSINESS PHONE:		410-220-0142

	MAIL ADDRESS:	
		STREET 1:		650 SOUTH EXETER STREET
		STREET 2:		SUITE 1070
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21202

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Rock Springs Capital Management LP
		CENTRAL INDEX KEY:			0001595725
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38433
		FILM NUMBER:		18716653

	BUSINESS ADDRESS:	
		STREET 1:		650 SOUTH EXETER STREET
		STREET 2:		SUITE 1070
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21202
		BUSINESS PHONE:		4102200129

	MAIL ADDRESS:	
		STREET 1:		650 SOUTH EXETER STREET
		STREET 2:		SUITE 1070
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21202

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Rock Springs Capital Master Fund LP
		CENTRAL INDEX KEY:			0001735393
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38433
		FILM NUMBER:		18716652

	BUSINESS ADDRESS:	
		STREET 1:		650 SOUTH EXETER STREET
		STREET 2:		SUITE 1070
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21202
		BUSINESS PHONE:		410-220-0142

	MAIL ADDRESS:	
		STREET 1:		190 ELGIN AVENUE
		CITY:			GEORGE TOWN
		STATE:			E9
		ZIP:			KY1 9001

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Homology Medicines, Inc.
		CENTRAL INDEX KEY:			0001661998
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				473468154
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		45 WIGGINS AVE.
		CITY:			BEDFORD
		STATE:			MA
		ZIP:			01730
		BUSINESS PHONE:		857-305-1825

	MAIL ADDRESS:	
		STREET 1:		45 WIGGINS AVE.
		CITY:			BEDFORD
		STATE:			MA
		ZIP:			01730
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>doc3.xml
<DESCRIPTION>FORM 3 SUBMISSION
<TEXT>
Document 1 - file: doc3.html

Document 1 - RAW XML: doc3.xml

</DOCUMENT>
</SEC-DOCUMENT>