0001973141-24-000168.txt : 20240311 0001973141-24-000168.hdr.sgml : 20240311 20240311161018 ACCESSION NUMBER: 0001973141-24-000168 CONFORMED SUBMISSION TYPE: 144 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20240311 DATE AS OF CHANGE: 20240311 SUBJECT COMPANY: 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: 144 SEC ACT: 1933 Act SEC FILE NUMBER: 001-38295 FILM NUMBER: 24738077 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 REPORTING-OWNER: COMPANY DATA: COMPANY CONFORMED NAME: Mostafa Adam S. CENTRAL INDEX KEY: 0001738081 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 144 MAIL ADDRESS: STREET 1: C/O X4 PHARMACEUTICALS INC. STREET 2: 61 NORTH BEACON STREET, 4TH FLOOR CITY: BOSTON STATE: MA ZIP: 02134 144 1 primary_doc.xml 144 0001738081 XXXXXXXX LIVE 0001501697 X4 Pharmaceuticals, Inc 001-38295 61 NORTH BEACON STREET 4TH FLOOR BOSTON MA 02134 857-529-8300 Mostafa Adam S. Officer Common UBS Financial Services, Inc.

1000 Harbor Boulevard Weehawken NJ 07016

52500 47250.00 167291209 03/11/2024 NASDAQ Common 03/11/2024 RSU Issuer N 52500 03/11/2024 N/A N Adam Mostafa

61 NORTH BEACON STREET 4th Floor Boston MA 02134

Common 02/12/2024 27721 27973.26 03/11/2024 05/23/2023 /s/ UBS Financial Services Inc, as attorney-in-fact for Adam Mostafa