Biotechnology Value Fund L P - Aug 13, 2025 SCHEDULE 13G Report for X4 Pharmaceuticals, Inc Common Stock, par value $0.001 per share (XFOR)

Filing Manager
Biotechnology Value Fund L P
Reporting Manager
BVF PARTNERS L P/IL
Security
X4 Pharmaceuticals, Inc Common Stock, par value $0.001 per share
Symbol
XFOR
Shares outstanding
22.7M shares
Disclosed Ownership
2.24M shares
Ownership
9.9%
Form type
SCHEDULE 13G
Date filed
8/20/2025, 05:41 PM
Date of event
Aug 13, 2025
SEC
View on sec.gov

Reporting Managers (10)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
BIOTECHNOLOGY VALUE FUND L P 5.2% 1.17M 0 1.17M /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF I GP LLC 5.2% 1.17M 0 1.17M /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BIOTECHNOLOGY VALUE FUND II LP 4% 907K 0 907K /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF II GP LLC 4% 907K 0 907K /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
Biotechnology Value Trading Fund OS LP 0.6% 123K 0 123K /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF Partners OS Ltd. 0.6% 123K 0 123K /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF GP HOLDINGS LLC 9.2% 2.08M 0 2.08M /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF PARTNERS L P/IL 9.9% 2.24M 0 2.24M /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF INC/IL 9.9% 2.24M 0 2.24M /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
LAMPERT MARK N 9.9% 2.24M 0 2.24M /s/ Mark N. Lampert Mark N. Lampert