<SEC-DOCUMENT>0000899243-19-009671-index.html : 20190402
<SEC-HEADER>0000899243-19-009671.hdr.sgml : 20190402
<ACCEPTANCE-DATETIME>20190402200407
ACCESSION NUMBER:		0000899243-19-009671
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20190313
FILED AS OF DATE:		20190402
DATE AS OF CHANGE:		20190402

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Bridger Gary
		CENTRAL INDEX KEY:			0001600049

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38295
		FILM NUMBER:		19727177

	MAIL ADDRESS:	
		STREET 1:		C/O FIVE CORNERS CAPITAL
		STREET 2:		700 WEST GEORGIA STREET, SUITE 2500
		CITY:			VANCOUVER
		STATE:			A1
		ZIP:			V7Y 1B3

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			X4 Pharmaceuticals, Inc
		CENTRAL INDEX KEY:			0001501697
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				273181608
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		955 MASSACHUSETTS AVENUE
		STREET 2:		4TH FLOOR
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139
		BUSINESS PHONE:		857-529-8300

	MAIL ADDRESS:	
		STREET 1:		955 MASSACHUSETTS AVENUE
		STREET 2:		4TH FLOOR
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Arsanis, Inc.
		DATE OF NAME CHANGE:	20100920
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>doc4a.xml
<DESCRIPTION>FORM 4/A SUBMISSION
<TEXT>
Document 1 - file: doc4a.html

Document 1 - RAW XML: doc4a.xml

</DOCUMENT>
</SEC-DOCUMENT>