Commonwealth Fusion Systems

The world's largest and leading commercial fusion energy company

Headquarters: Devens, Massachusetts
Employees: 501–1000
Founded: 2018
Business Model: B2B

Website: cfs.energy
Total Funding: $2.9B
Last Round: $863.0M Extension RoundAug 2025
Rounds: 4

About

Commonwealth Fusion Systems (CFS) is an MIT spinout building the world's first commercially relevant net-energy fusion machine, SPARC, using revolutionary high-temperature superconducting magnets. CFS aims to deliver cost-competitive, clean fusion energy to the grid through its ARC power plant design, combining proven tokamak science with breakthrough magnet technology to accelerate fusion commercialization.

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Funding History

Extension RoundSeries B2Aug 2025

Aug 2025

Series BSeries BDec 2021

Dec 2021

Extension RoundSeries A2May 2020

May 2020

Series ASeries AJun 2019

Jun 2019

Investors

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