<SEC-DOCUMENT>0001193125-19-103832-index.html : 20190411
<SEC-HEADER>0001193125-19-103832.hdr.sgml : 20190411
<ACCEPTANCE-DATETIME>20190411160057
ACCESSION NUMBER:		0001193125-19-103832
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		11
CONFORMED PERIOD OF REPORT:	20190411
ITEM INFORMATION:		Other Events
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20190411
DATE AS OF CHANGE:		20190411

FILER:

	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

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38295
		FILM NUMBER:		19743792

	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>8-K
<SEQUENCE>1
<FILENAME>d733375d8k.htm
<DESCRIPTION>FORM 8-K
<TEXT>
Document 1 - file: d733375d8k.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-10.1 <SEQUENCE>2 <FILENAME>d733375dex101.htm <DESCRIPTION>EX-10.1 <TEXT> Document 2 - file: d733375dex101.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-99.1 <SEQUENCE>3 <FILENAME>d733375dex991.htm <DESCRIPTION>EX-99.1 <TEXT> Document 3 - file: d733375dex991.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-99.2 <SEQUENCE>4 <FILENAME>d733375dex992.htm <DESCRIPTION>EX-99.2 <TEXT> Document 4 - file: d733375dex992.htm
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>5 <FILENAME>g733375dsp10.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 5 - file: g733375dsp10.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>6 <FILENAME>g733375g0408110449002.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 6 - file: g733375g0408110449002.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>7 <FILENAME>g733375g0408110449096.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 7 - file: g733375g0408110449096.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>8 <FILENAME>g733375g0408110449205.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 8 - file: g733375g0408110449205.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>9 <FILENAME>g733375g0408110449314.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 9 - file: g733375g0408110449314.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>10 <FILENAME>g733375g20h31.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 10 - file: g733375g20h31.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>11 <FILENAME>g733375g30u90.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 11 - file: g733375g30u90.jpg
</DOCUMENT> </SEC-DOCUMENT>