Fortistar is a White Plains, New York-based private investment firm founded in 1993 that provides capital to build, grow and manage sustainability-oriented companies. It focuses on U.S. opportunities across energy transition and infrastructure markets, including renewable fuels, hydrogen, energy storage, waste plastics, carbon capture, transportation and industrial decarbonization. The firm has led financings totaling over $3.5 billion, making it most relevant for companies in clean energy, climate, environmental services and related infrastructure sectors.