<SEC-DOCUMENT>0001628280-20-002798-index.html : 20200303
<SEC-HEADER>0001628280-20-002798.hdr.sgml : 20200303
<ACCEPTANCE-DATETIME>20200303165918
ACCESSION NUMBER:		0001628280-20-002798
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20200302
FILED AS OF DATE:		20200303
DATE AS OF CHANGE:		20200303

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ragan Paula
		CENTRAL INDEX KEY:			0001769914

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38295
		FILM NUMBER:		20683399

	MAIL ADDRESS:	
		STREET 1:		C/O X4 PHARMACEUTICALS, INC.
		STREET 2:		955 MASSACHUSETTS AVE., 4TH FLOOR
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139

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
<SEQUENCE>1
<FILENAME>wf-form4_158327274059484.xml
<DESCRIPTION>FORM 4
<TEXT>
Document 1 - file: wf-form4_158327274059484.html

Document 1 - RAW XML: wf-form4_158327274059484.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>x4poaragan.htm
<DESCRIPTION>PAULA RAGAN
<TEXT>
Document 2 - file: x4poaragan.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>x4poaragan001.jpg
<DESCRIPTION>IMAGE
<TEXT>
Document 3 - file: x4poaragan001.jpg

</DOCUMENT>
</SEC-DOCUMENT>