X0508 4 2026-01-01 0 0001501697 X4 Pharmaceuticals, Inc XFOR 0001887843 de Craecker Francoise C/O X4 PHARMACEUTICALS, INC. 61 NORTH BEACON STREET 4TH FLOOR BOSTON MA 02134 1 0 0 0 0 Stock Option (right to buy) 4 2026-01-01 4 A 0 110000 0 A 2036-01-01 Common Stock 110000 0 D The shares subject to the option shall vest in full upon stockholder approval of an increase in the share reserve under the Companys Amended and Restated 2017 Equity Incentive Plan at the Companys 2026 annual meeting of stockholders, subject to the Reporting Person continuing to provide services through such date. Exhibit List: Exhibit 24 Power of Attorney /s/ David Kirske, attorney-in-fact 2026-01-05