CFS raises $863M Series B2 with investors including NVIDIA's NVentures and Google

Commonwealth Fusion Systems

Commonwealth Fusion Systems raised $863M in a Series B2 round announced 28 August 2025, with new investors including NVIDIA's NVentures and a Japanese consortium led by Mitsui and Mitsubishi, plus Google. The money goes toward finishing SPARC and developing the first ARC plant.

• $863 million Series B2 with new and returning investors.
• New investors: NVIDIA Ventures, Japanese consortium (Mitsui, Mitsubishi), others.
• Existing investors increasing stakes: Breakthrough Energy, Google, Khosla, Eni, Gates Frontier.
• Total CFS capital raised now ~$3 billion, ~one-third of all private fusion investment globally.