X4 Pharmaceuticals, Inc. is a late clinical-stage company, which engages in the development and discovery of novel therapeutics for the treatment of rare diseases and those with limited treatment options. Its clinical candidate is mavorixafor. The company was founded by Henri A. Termeer, Keith T. Flaherty, Renato T. Skerlj, Richard Peters and Paula Ragan in 2010 and is headquartered in Boston, MA.