Commonwealth Fusion Systems
formerly Commonwealth FusionThe world's largest and leading commercial fusion energy company
Devens, United States · Founded 2018 · $3.9B raised
- Headquarters
- Devens, Massachusetts
- Employees
- 501–1000
- Founded
- 2018
- Business Model
- B2B
- Website
- cfs.energy
- Total Funding
- $3.9B
- Last Round
- $1.0B Venture RoundJul 2026
- Rounds
- 6
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
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.
Summary
Commonwealth Fusion Systems is a Climate Tech company based in Devens, United States, founded in 2018. It has raised $3.9B in total across 6 rounds, most recently a $1.0B Venture Round in Jul 2026. Investors include Eni, Tiger Global and Temasek.
Tech & App Stack
15 technologies & apps tracked
Every product and vendor across these categories, with where each signal came from.
Create a free account with 25 free credits every month, no card needed, to unlock the full tech & app stack, funding history, and valuations.
Funding History
Jul 2026
Sign up to see all 6 events
Funding: Seed through Venture Round. Amounts, valuations, and investors where available.
Investors
Eni
5 rounds
Tiger Global
2 rounds
Temasek
2 rounds
GV
1 round
Breakthrough Energy Ventures
4 rounds
Khosla Ventures
4 rounds
Future Ventures
3 rounds
Safar Partners
3 rounds
Starlight Ventures
3 rounds
Emerson Collective
2 rounds
2 rounds
Hostplus
2 rounds
Devonshire Investors
2 rounds
Equinor Ventures
2 rounds
The Engine
2 rounds
Moore Strategic Ventures
2 rounds
Schooner Capital
2 rounds
Gates Frontier
1 round
Lowercarbon Capital
1 round
Eric Schmidt
1 round
nVentures
1 round
Stanley Druckenmiller
1 round
Galaxy Interactive
1 round
Gigascale Capital
1 round
HOF Capital
1 round
Neva SGR
1 round
Woori Venture Partners
1 round
Planet First Partners
1 round
FFA Private Bank
1 round
Mitsui & Co
1 round
Brevan Howard Digital
1 round
Morgan Stanley
1 round
Bill Gates
1 round
Coatue Management
1 round
FootPrint Coalition
1 round
JIMCO Technology Fund
1 round
John Doerr
1 round
JS Capital
1 round
TIME Ventures
1 round
Senator Investment Group
1 round
Andreessen Horowitz
1 round
Valor Equity Partners
1 round
DFJ
1 round
Lowercase Capital
1 round
Similar Companies
Oklo develops advanced fission power plants and fuel-recycling technologies to deliver reliable, ...
Nuclear fusion energy company building the world's first commercial fusion power plant; has a 50 ...
Antares Nuclear builds factory-produced fission microreactors that supply 100kWe to 1MWe of strat...
Home battery and energy company that provides distributed power storage to reinforce the electric...
Appears in
Your company? Embed this profile
Add the live badge to your site — it stays current as your funding data updates.
<a href="https://indexed.vc/companies/commonwealth-fusion-systems"><img src="https://indexed.vc/api/badge/company/commonwealth-fusion-systems" alt="Commonwealth Fusion Systems on Indexed.vc" width="260" height="76" /></a>