<SEC-DOCUMENT>0001628280-24-042323-index.html : 20241004
<SEC-HEADER>0001628280-24-042323.hdr.sgml : 20241004
<ACCEPTANCE-DATETIME>20241004165607
ACCESSION NUMBER:		0001628280-24-042323
CONFORMED SUBMISSION TYPE:	S-8
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20241004
DATE AS OF CHANGE:		20241004
EFFECTIVENESS DATE:		20241004

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			X4 Pharmaceuticals, Inc
		CENTRAL INDEX KEY:			0001501697
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				273181608
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-8
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-282513
		FILM NUMBER:		241355475

	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>S-8
<SEQUENCE>1
<FILENAME>a092024s-8.htm
<DESCRIPTION>S-8
<TEXT>
Document 1 - file: a092024s-8.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-FILING FEES
<SEQUENCE>2
<FILENAME>ex107calculationoffilingfe.htm
<DESCRIPTION>EX-FILING FEES
<TEXT>
Document 2 - file: ex107calculationoffilingfe.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>3
<FILENAME>ex51legalopinions-8october.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 3 - file: ex51legalopinions-8october.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>4
<FILENAME>ex_231xpwcconsentoct2024.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 4 - file: ex_231xpwcconsentoct2024.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>goodwinlogo.jpg
<TEXT>
Document 5 - file: goodwinlogo.jpg

</DOCUMENT>
</SEC-DOCUMENT>