X4 Pharmaceuticals Inc. announced the closing of an underwritten public offering, raising approximately $155.3 million in gross proceeds. The offering included 52,844,000 shares of common stock, as well as pre-funded warrants to purchase up to 700,000 shares. The underwriters exercised their option to purchase an additional 6,984,000 shares in full. The shares were offered at $2.90 per share, and the pre-funded warrants at $2.899 per warrant with an exercise price of $0.001 per share. After the offering, the total shares outstanding stood at 79,214,708. Leerink Partners, Stifel, and Guggenheim Securities acted as joint bookrunning managers for the offering.