SCHEDULE 13G/A

X4 Pharmaceuticals Inc

Common Stock, par value $0.001 per share · CUSIP: 98420X202

Event date: 2025-12-31

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Trails Edge Capital Partners, LP

  Shares: 5,227,222.00 · Class: 5.8%

• Trails Edge Biotechnology Master Fund, LP

  Shares: 5,227,222.00 · Class: 5.8%

• Ortav Yehudai

  Shares: 5,227,222.00 · Class: 5.8%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.