Quick Takeaways
- BIOTECHNOLOGY VALUE FUND L P filed SCHEDULE 13G/A for X4 Pharmaceuticals, Inc Common Stock, par value $0.001 per share (XFOR).
- Disclosed ownership: 3.9%.
- Date of event: 31 Dec 2025.
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
- 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
Quoteable Key Fact
"BIOTECHNOLOGY VALUE FUND L P disclosed 3.9% ownership in X4 Pharmaceuticals, Inc Common Stock, par value $0.001 per share (XFOR) on 31 Dec 2025."
What Changed
- Previous schedule filing date: 20 Aug 2025.
- Current filing was accepted on 17 Feb 2026, 16:30.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
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 |