Commonwealth Fusion Systems
Unknown, US · Founded 2017 · Delaware LLC · 40 known investors
Commonwealth Fusion Systems develops commercial fusion power plants using high-temperature superconducting magnet technology to provide grid-scale energy.
Founders & leadership
BS
Brandon SorbomFounder
RM
Robert MumgaardExecutive Officer, Director
DB
Daniel BrunnerExecutive Officer
MP
Massimiliano PieriDirector
KR
Katie RaeDirector
AE
Alan EustaceDirector
Investors · 40
Advection Growth CapitalNew York City
Armada Investment AG
Bay Bridge Ventures ClimateBerkeley
Beni Venture CapitalMiami · $100K – $250K
Brainstorm VenturesSan Francisco
Collaborative FundNew York · $500K – $1M
Collaborative Fund (Collab Fund)New York
Congruent VenturesSan Francisco · $100K – $5M
Doon CapitalSilicon Valley
Eni NextBoston
Evolution VC PartnersNew York
Fine Structures VenturesCambridge
Future VenturesLos Altos · $1M – $10M
Gigascale CapitalPalo Alto
Global BrainTokyo · $100K – $184M
HOF CapitalNew York · $25K – $15M
JERATokyo
Khosla VenturesMenlo Park · $5K – $50M
LOWERCARBONJackson · $1M – $50M
Lowercarbon CapitalNew York · $100K – $5M
Neva Sgr.Turin
NTT DOCOMO VenturesTokyo
Perot JainDallas · $500K
Preston-Werner VenturesSan Francisco Bay Area · $500K – $3M
Prime Movers LabJackson · $2M – $30M
Safar PartnersCambridge
Schooner CapitalBoston
Starbridge Venture Capital LlcWashington
The Engine VenturesCambridge
Breakthrough Energy VenturesreportedBoston · $500K – $50Mvia Carmichael Roberts · quoted
Devonshire Investorsreported
Emerson Collective InvestingreportedPalo Alto · $100K – $1M
Equinor VenturesreportedStavanger · $1M – $70M
FootPrint CoalitionreportedLos Angeles · $50K – $1M
Kleiner PerkinsreportedMenlo Park · $500K – $15Mvia John Doerr · quoted
NVenturesreportedSanta Clara
Starlight Venturesreported · 2 sourcesMiami · $100K – $3M
TemasekreportedSingapore
Thrive CapitalreportedNew York · $500K – $25M
Tiger Global Managementreported · 2 sourcesNew York · $1M – $100M
Reported raises · per SEC filings
Form D private placements▶$1.8BraisedDec 2021 · 72 investors · Other EnergyRule 506(b)
▶$1.8BraisedDec 2021 · 72 investors · Other Energy
Rule 506(b)Officers, directors & promoters on the filing
- Brandon SorbomExecutive Officer, Director
- Robert MumgaardExecutive Officer, Director
- Katie RaeDirector
- Alan EustaceDirector
- Massimiliano PieriDirector
- Mitchell GoldsteinExecutive Officer
- Offering amount
- $1.8B
- Amount sold
- $1.8B
- First sale
- Nov 2021
- Incorporated
- Limited Liability Company, Delaware, 2017
- Federal exemptions
- 06b
▶$80.6MraisedMay 2020 · 23 investors · Other EnergyRule 506(b)
▶$80.6MraisedMay 2020 · 23 investors · Other Energy
Rule 506(b)Officers, directors & promoters on the filing
- Daniel BrunnerExecutive Officer
- Massimiliano PieriDirector
- Brandon SorbomExecutive Officer, Director
- Robert MumgaardExecutive Officer, Director
- Alan EustaceDirector
- Katie RaeDirector
- Offering amount
- $100M
- Amount sold
- $80.6M
- First sale
- May 2020
- Incorporated
- Limited Liability Company, Delaware, 2017
- Federal exemptions
- 06b
▶$115MraisedJul 2019 · 24 investors · Other EnergyRule 506(b)
▶$115MraisedJul 2019 · 24 investors · Other Energy
Rule 506(b)Officers, directors & promoters on the filing
- Brandon SorbomExecutive Officer, Director
- Robert MumgaardExecutive Officer, Director
- Daniel BrunnerExecutive Officer
- Massimiliano PieriDirector
- Katie RaeDirector
- Alan EustaceDirector
- Offering amount
- $115M
- Amount sold
- $115M
- First sale
- May 2018
- Incorporated
- Limited Liability Company, Delaware, 2017
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
In the news
- Fusion power darling Commonwealth Fusion Systems raises another $1Btechcrunch.com · 2026
- Realta Fusion, Inertia Enterprises select HQ locations -- ANS / Nuclear Newswireans.org · 2026
- Fusion roundup: Helion sets temperature record; Inertia raises $450M -- ANS / Nuclear Newswireans.org · 2026
- Commercial Fusion Energy Funding Status: Mid-Year 2026thefusionreport.substack.com · 2026
- Global Investments In Nuclear Fusion Surge 69% To $4.5B | OilPrice.comoilprice.com · 2026
- 6 Best Fusion Energy Stocks for 2026 and How to Invest | The Motley Foolfool.com · 2026
- Fusion industry scores record annual funding of $4.48bninnovationnewsnetwork.com · 2026
- Commonwealth Fusion Systems raises $1.8 billion to commercialize fusion energycfs.energy · 2021