0001470831-25-000145.txt : 20250825 0001470831-25-000145.hdr.sgml : 20250825 20250825163415 ACCESSION NUMBER: 0001470831-25-000145 CONFORMED SUBMISSION TYPE: D PUBLIC DOCUMENT COUNT: 1 ITEM INFORMATION: Rule 506(b) provides a "safer harbor" for a private offering FILED AS OF DATE: 20250825 DATE AS OF CHANGE: 20250825 EFFECTIVENESS DATE: 20250825 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 EIN: 273181608 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: D SEC ACT: 1933 Act SEC FILE NUMBER: 021-555727 FILM NUMBER: 251251391 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 D 1 primary_doc.xml X0708 D LIVE 0001501697 X4 Pharmaceuticals, Inc 61 NORTH BEACON STREET 4TH FLOOR BOSTON MA MASSACHUSETTS 02134 857-529-8300 DELAWARE Arsanis, Inc. Corporation true Adam Craig X4 PHARMACEUTICALS, INC. 61 NORTH BEACON STREET, 4TH FLOOR BOSTON MA MASSACHUSETTS 02134 Executive Officer Director John Volpone X4 PHARMACEUTICALS, INC. 61 NORTH BEACON STREET, 4TH FLOOR BOSTON MA MASSACHUSETTS 02134 Executive Officer Christophe Arbet-Engels X4 PHARMACEUTICALS, INC. 61 NORTH BEACON STREET, 4TH FLOOR BOSTON MA MASSACHUSETTS 02134 Executive Officer Mark Baldry X4 PHARMACEUTICALS, INC. 61 NORTH BEACON STREET, 4TH FLOOR BOSTON MA MASSACHUSETTS 02134 Executive Officer Mary DiBiase X4 PHARMACEUTICALS, INC. 61 NORTH BEACON STREET, 4TH FLOOR BOSTON MA MASSACHUSETTS 02134 Executive Officer David Kirske X4 PHARMACEUTICALS, INC. 61 NORTH BEACON STREET, 4TH FLOOR BOSTON MA MASSACHUSETTS 02134 Executive Officer Gary J. Bridger X4 PHARMACEUTICALS, INC. 61 NORTH BEACON STREET, 4TH FLOOR BOSTON MA MASSACHUSETTS 02134 Director Francoise De Craecker X4 PHARMACEUTICALS, INC. 61 NORTH BEACON STREET, 4TH FLOOR BOSTON MA MASSACHUSETTS 02134 Director Murray W. Stewart X4 PHARMACEUTICALS, INC. 61 NORTH BEACON STREET, 4TH FLOOR BOSTON MA MASSACHUSETTS 02134 Director Michael S. Wyzga X4 PHARMACEUTICALS, INC. 61 NORTH BEACON STREET, 4TH FLOOR BOSTON MA MASSACHUSETTS 02134 Director Biotechnology Decline to Disclose 06b false 2025-08-13 false true true true false 0 STIFEL, NICOLAUS & COMPANY, INCORPORATED 793 None None 501 NORTH BROADWAY ST. LOUIS MO MISSOURI 63102 All States true 84999985 84999985 0 false 18 3300000 0 0 false X4 Pharmaceuticals, Inc /s/ Natasha Thoren Natasha Thoren Chief Legal Officer 2025-08-25