BIOTECHNOLOGY VALUE FUND L P - 31 Dec 2025 SCHEDULE 13G/A 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
87,487,000 shares
Disclosed Ownership
3,411,993 shares
Ownership
3.9%
Form type
SCHEDULE 13G/A
Filing time
17 Feb 2026, 16:30:31 UTC
Date of event
31 Dec 2025
Previous filing
20 Aug 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 2.1% 1,827,005 0 1,827,005 /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF I GP LLC 2.1% 1,827,005 0 1,827,005 /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BIOTECHNOLOGY VALUE FUND II LP 1.5% 1,339,509 0 1,339,509 /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF II GP LLC 1.5% 1,339,509 0 1,339,509 /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
Biotechnology Value Trading Fund OS LP 0.2% 194,535 0 194,535 /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF Partners OS Ltd. 0.2% 194,535 0 194,535 /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF GP HOLDINGS LLC 3.6% 3,166,514 0 3,166,514 /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF PARTNERS L P/IL 3.9% 3,411,993 0 3,411,993 /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
BVF INC/IL 3.9% 3,411,993 0 3,411,993 /s/ Mark N. Lampert Mark N. Lampert, Authorized Signatory
LAMPERT MARK N 3.9% 3,411,993 0 3,411,993 /s/ Mark N. Lampert Mark N. Lampert