0001973141-23-000115.txt : 20230630 0001973141-23-000115.hdr.sgml : 20230630 20230630152921 ACCESSION NUMBER: 0001973141-23-000115 CONFORMED SUBMISSION TYPE: 144 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20230630 DATE AS OF CHANGE: 20230630 SUBJECT COMPANY: 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: 144 SEC ACT: 1933 Act SEC FILE NUMBER: 001-38295 FILM NUMBER: 231061377 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 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 Blvd 3rd Floor Weehawken NJ 07086

2641 5000.47 122207488 06/30/2023 NASDAQ Common 06/30/2023 Restricted Stock Award Issuer N 2641 06/30/2023 N/A N Adam Mostafa

61 NORTH BEACON STREET 4TH FLOOR BOSTON MA 02134

Common 06/15/2023 5417 12051.20 Adam Mostafa

61 NORTH BEACON STREET 4TH FLOOR BOSTON MA 02134

Common 06/23/2023 5417 10430.43 06/30/2023 09/29/2022 /s/ UBS Financial Services Inc, as attorney-in-fact for Adam Mostafa