<SEC-DOCUMENT>0001628280-22-025519-index.html : 20220927
<SEC-HEADER>0001628280-22-025519.hdr.sgml : 20220927
<ACCEPTANCE-DATETIME>20220927075307
ACCESSION NUMBER:		0001628280-22-025519
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		42
CONFORMED PERIOD OF REPORT:	20220927
ITEM INFORMATION:		Regulation FD Disclosure
ITEM INFORMATION:		Other Events
FILED AS OF DATE:		20220927
DATE AS OF CHANGE:		20220927

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:		221267281

	BUSINESS ADDRESS:	
		STREET 1:		61 NORTH BEACON STREET
		STREET 2:		4TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02134
		BUSINESS PHONE:		857-529-8300

	MAIL ADDRESS:	
		STREET 1:		61 NORTH BEACON STREET
		STREET 2:		4TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02134

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Arsanis, Inc.
		DATE OF NAME CHANGE:	20100920
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>xfor-20220927.htm
<DESCRIPTION>8-K
<TEXT>
Document 1 - file: xfor-20220927.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-99.1 <SEQUENCE>2 <FILENAME>ex991xforpressrelease.htm <DESCRIPTION>EX-99.1 <TEXT> Document 2 - file: ex991xforpressrelease.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-99.2 <SEQUENCE>3 <FILENAME>ex992xforinvestordeck.htm <DESCRIPTION>EX-99.2 <TEXT> Document 3 - file: ex992xforinvestordeck.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-101.SCH <SEQUENCE>4 <FILENAME>xfor-20220927.xsd <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT <TEXT> Document 4 - file: xfor-20220927.xsd
</DOCUMENT> <DOCUMENT> <TYPE>EX-101.LAB <SEQUENCE>5 <FILENAME>xfor-20220927_lab.xml <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT <TEXT> Document 5 - file: xfor-20220927_lab.xml
</DOCUMENT> <DOCUMENT> <TYPE>EX-101.PRE <SEQUENCE>6 <FILENAME>xfor-20220927_pre.xml <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT <TEXT> Document 6 - file: xfor-20220927_pre.xml
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>7 <FILENAME>ex991xforpressrelease001.jpg <TEXT> Document 7 - file: ex991xforpressrelease001.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>8 <FILENAME>ex991xforpressrelease002.jpg <TEXT> Document 8 - file: ex991xforpressrelease002.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>9 <FILENAME>ex991xforpressrelease003.jpg <TEXT> Document 9 - file: ex991xforpressrelease003.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>10 <FILENAME>ex991xforpressrelease004.jpg <TEXT> Document 10 - file: ex991xforpressrelease004.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>11 <FILENAME>ex992xforinvestordeck001.jpg <TEXT> Document 11 - file: ex992xforinvestordeck001.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>12 <FILENAME>ex992xforinvestordeck002.jpg <TEXT> Document 12 - file: ex992xforinvestordeck002.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>13 <FILENAME>ex992xforinvestordeck003.jpg <TEXT> Document 13 - file: ex992xforinvestordeck003.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>14 <FILENAME>ex992xforinvestordeck004.jpg <TEXT> Document 14 - file: ex992xforinvestordeck004.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>15 <FILENAME>ex992xforinvestordeck005.jpg <TEXT> Document 15 - file: ex992xforinvestordeck005.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>16 <FILENAME>ex992xforinvestordeck006.jpg <TEXT> Document 16 - file: ex992xforinvestordeck006.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>17 <FILENAME>ex992xforinvestordeck007.jpg <TEXT> Document 17 - file: ex992xforinvestordeck007.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>18 <FILENAME>ex992xforinvestordeck008.jpg <TEXT> Document 18 - file: ex992xforinvestordeck008.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>19 <FILENAME>ex992xforinvestordeck009.jpg <TEXT> Document 19 - file: ex992xforinvestordeck009.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>20 <FILENAME>ex992xforinvestordeck010.jpg <TEXT> Document 20 - file: ex992xforinvestordeck010.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>21 <FILENAME>ex992xforinvestordeck011.jpg <TEXT> Document 21 - file: ex992xforinvestordeck011.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>22 <FILENAME>ex992xforinvestordeck012.jpg <TEXT> Document 22 - file: ex992xforinvestordeck012.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>23 <FILENAME>ex992xforinvestordeck013.jpg <TEXT> Document 23 - file: ex992xforinvestordeck013.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>24 <FILENAME>ex992xforinvestordeck014.jpg <TEXT> Document 24 - file: ex992xforinvestordeck014.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>25 <FILENAME>ex992xforinvestordeck015.jpg <TEXT> Document 25 - file: ex992xforinvestordeck015.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>26 <FILENAME>ex992xforinvestordeck016.jpg <TEXT> Document 26 - file: ex992xforinvestordeck016.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>27 <FILENAME>ex992xforinvestordeck017.jpg <TEXT> Document 27 - file: ex992xforinvestordeck017.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>28 <FILENAME>ex992xforinvestordeck018.jpg <TEXT> Document 28 - file: ex992xforinvestordeck018.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>29 <FILENAME>ex992xforinvestordeck019.jpg <TEXT> Document 29 - file: ex992xforinvestordeck019.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>30 <FILENAME>ex992xforinvestordeck020.jpg <TEXT> Document 30 - file: ex992xforinvestordeck020.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>31 <FILENAME>ex992xforinvestordeck021.jpg <TEXT> Document 31 - file: ex992xforinvestordeck021.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>32 <FILENAME>ex992xforinvestordeck022.jpg <TEXT> Document 32 - file: ex992xforinvestordeck022.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>33 <FILENAME>ex992xforinvestordeck023.jpg <TEXT> Document 33 - file: ex992xforinvestordeck023.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>34 <FILENAME>ex992xforinvestordeck024.jpg <TEXT> Document 34 - file: ex992xforinvestordeck024.jpg
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>35 <FILENAME>R1.htm <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 35 - file: R1.htm
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>36 <FILENAME>xfor-20220927_htm.xml <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 36 - file: xfor-20220927_htm.html
Document 36 - RAW XML: xfor-20220927_htm.xml
</DOCUMENT> <DOCUMENT> <TYPE>EXCEL <SEQUENCE>37 <FILENAME>Financial_Report.xlsx <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 37 - file: Financial_Report.xlsx
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>38 <FILENAME>Show.js <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 38 - file: Show.js
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>39 <FILENAME>report.css <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 39 - file: report.css
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>40 <FILENAME>FilingSummary.xml <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 40 - file: FilingSummary.html
Document 40 - RAW XML: FilingSummary.xml
</DOCUMENT> <DOCUMENT> <TYPE>JSON <SEQUENCE>42 <FILENAME>MetaLinks.json <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 42 - file: MetaLinks.json
</DOCUMENT> <DOCUMENT> <TYPE>ZIP <SEQUENCE>43 <FILENAME>0001628280-22-025519-xbrl.zip <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 43 - file: 0001628280-22-025519-xbrl.zip
</DOCUMENT> </SEC-DOCUMENT>