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Commonwealth Fusion Systems

Series B

Commercial magnetic confinement fusion energy powered by high-temperature superconductors

Clean EnergyTotal Raised: $2B+👥 501-1000 Employees📍 Devens, USA

About Commonwealth Fusion Systems

Commonwealth Fusion Systems (CFS), an MIT spin-out, is building SPARC, a compact tokamak designed to demonstrate net energy gain from magnetic confinement nuclear fusion. CFS leverages high-temperature superconducting (HTS) magnets to deliver inexhaustible, zero-emission baseload power.

Founders & Leadership

Bob MumgaardCo-Founder & CEO
Dennis WhyteCo-Founder & Scientific Advisor
Martin GreenwaldCo-Founder

Funding History

1 round
Series B2LATEST ROUND
Jul 30, 2026
RAISED$1B