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Companies / Commonwealth Fusion Systems

Commonwealth Fusion Systems

Devens, United States

Commonwealth Fusion Systems is developing commercial fusion energy systems using high-temperature superconducting magnets and tokamak-based configurations.

EducationIndustrial & Manufacturing

Commonwealth Fusion Systems, based in Devens, United States, has 29 investors on file, among them Advection Growth Capital, Balerion Space Ventures and Beni VC. Its latest round on record is Series C+, 30 Jul 2026, of 3 rounds. Its site was last checked 12 Nov 2026: site answers.

cfs.energy

Funding

3 rounds on record
Latest roundSeries C+30 Jul 2026
Since that round4 monthsno later round on record
Time between rounds6 monthson average, over 3 rounds
Investors in its rounds82 with a VCinfo profile
Jul 2026Series C+Investors not named
Aug 2025Series BLed by Counterpoint Global, with GV, Breakthrough Energy Ventures and 5 others
Jun 2025Series C+Led by GV, Google

Round sizes and total raised are on Fundup AI, our sister product for funding data.

Investors

29 investors on file
InvestorEvidenceType
Advection Growth CapitalPortfolio pageInvestor
Balerion Space VenturesPortfolio pageVenture capital
Beni VCPortfolio pageVenture capital
Benim CapitalPortfolio pageInvestor
Brainstorm VenturesPortfolio pageVenture capital
Breakthrough Energy VenturesPortfolio pageVenture capital
Collaborative FundPortfolio pageVenture capital
Critical FrontierPortfolio pageVenture capital
DFJ GrowthPortfolio pageVenture capital
Doon CapitalPortfolio pageInvestor
Engine VenturesPortfolio pageVenture capital
Fine Structure VenturesPortfolio pageVenture capital
Future VenturesPortfolio pageVenture capital
Gigascale CapitalPortfolio pageVenture capital
Global BrainPortfolio pageVenture capital
GVPortfolio pageVenture capital
Happiness CapitalPortfolio pageVenture capital
HOF CapitalPortfolio pageVenture capital
Khosla VenturesPortfolio pageVenture capital
Lowercarbon CapitalPortfolio pageVenture capital
Neva SGRPortfolio pageVenture capital
Preston-Werner VenturesPortfolio pageVenture capital
Prime Movers LabPortfolio pageVenture capital
Safar PartnersPortfolio pageVenture capital
Standish Spring InvestmentsPortfolio pageVenture capital
Starbridge Venture CapitalPortfolio pageVenture capital
Starlight VenturesPortfolio pageVenture capital
Third PrimePortfolio pageVenture capital
Timescale VenturesPortfolio pageVenture capital

A company is shown only after its own site answers and carries its name. Sites are checked again on a schedule, because domains lapse and get bought. Round stages and dates come from Fundup AI; investor links come from portfolio pages and rounds; other facts name their source when you point at them. How we grade the data

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VCinfo API
$ curl -H "X-API-Key: YOUR_KEY" \
  https://api.vcinfo.io/v1/companies/cfs.energy/investors

# also
GET /v1/companies/cfs.energy
GET /v1/companies/cfs.energy/news
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