About Commonwealth Fusion Systems
Commonwealth Fusion Systems is an Energy & Utilities company based in Cambridge (United States) founded in 2018 by Bob Mumgaard, Robert Mumgaard, Martin Greenwald, and Dan Brunner. Compact tokamak fusion reactors are developed with superconducting magnets. It operates on a Green Energy-as-a-Service model. Commonwealth Fusion Systems has raised $3.93 billion across 7 funding rounds from investors including Google, Mitsui & Co and Eni Next. Its chief executive, as recorded, is Bob Mumgaard. Its website cfs.energy draws about 73 thousand monthly visits. Commonwealth Fusion Systems offers products and services including SPARC and ARC. Its focus areas include Energy, Renewable Energy and Fusion Energy. Its competitors include Helion, TAE Technologies and Zap Energy; 3 of its 3 listed competitors have raised funding.
Company details
Commonwealth Fusion Systems is engaged in the development of commercial fusion energy solutions. The company utilizes high-temperature superconducting magnets to create smaller, cost-effective tokamak fusion systems. Key projects include SPARC, a net energy fusion machine, and ARC, a future fusion power plant. Operating in the renewable energy sector, the company aims to provide clean, abundant energy to combat climate change. A global ecosystem of suppliers and researchers supports its mission to scale fusion power plants.
- Total Equity Funding$3.93B (USD)
in 7 rounds
- Latest Funding Round$1B (USD), Series C
Jul 2026
- InvestorsGoogle
& 58 more
Products & Services of Commonwealth Fusion Systems
Commonwealth Fusion Systems offers a comprehensive portfolio of products and services, including SPARC and ARC.
SPARC is developed as a net energy fusion machine.
ARC is designed as a commercial fusion power plant.
Apps and channels of Commonwealth Fusion Systems
its YouTube channel Commonwealth Fusion Systems has 6.21K subscribers and 30 videos.
Videos from Commonwealth Fusion Systems
The most watched videos on Commonwealth Fusion Systems's YouTube channel, Commonwealth Fusion Systems (6.21K subscribers). Click a video to play it here.
More on Commonwealth Fusion Systems.
Funding Insights of Commonwealth Fusion Systems
Commonwealth Fusion Systems has successfully raised a total of $3.93B across 7 strategic funding rounds. The most recent funding activity was a Series C round of $1 billion completed in July 2026. This substantial capital infusion reflects strong investor confidence in the company's business model, growth potential, and market opportunities. The funding enables strategic expansion, product development, market penetration, and operational scaling to drive long-term value creation and competitive advantage.
- Total Funding $3.93B
- Total Rounds 7
- Last Round Series C — $1B
- First Round $64.59M
(Mar 2018)
- Investors Count 59
All 7 funding rounds of Commonwealth Fusion Systems with amounts and investors; the two latest post-money valuations are shown, the rest are part of the premium plan.
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| Jul 2026 | $1B | Series C | – | – | – |
| Aug 2025 | $863M | Series B | – | – | |
| Dec 2021 | $1.8B | Series B | – | Tiger Global Management | |
| Mar 2021 | $1.54M | Grant | – | – | |
| May 2020 | $84M | Series A | – | Temasek | |
| Jun 2019 | $115M | Series A | – | Future Ventures, Khosla Ventures | |
| Mar 2018 | $64.59M | Series A | – | Eni Next |
59 investors in total: 53 institutional and 6 angel.
Investors in Commonwealth Fusion Systems
Commonwealth Fusion Systems has secured backing from 59 investors, including angel, venture fund, and institutional investors. Prominent investors backing the company include Google, Mitsui & Co and Eni Next.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Venture and private equity investments are managed with global diversification. | tigerglobal.com | New York, United States | ||
Investments are directed toward innovative technology startups by DFJ Growth. | dfjgrowth.com | Menlo Park, United States | ||
Provider of an investment platform for various stages | coatue.com | New York, United States | ||
Infrastructure and venture capital firm focused on renewable energy, technology, and life science sectors | jimco.com | |||
Venture capital is invested in media sectors by the firm. | footprintcoalition.com | Los Angeles, United States | ||
Climate solutions are advanced via venture capital and startup acceleration. | breakthroughenergy.org | Kirkland, United States | ||
Private equity & fixed income investments focused hedge fund | senatorlp.com | New York, United States | ||
An investment platform is provided for diverse sectors and geographies. | 1974 | temasek.com.sg | Singapore, Singapore | |
High-tech startups are invested in by Starlight Ventures. | starlight.vc | Miami, United States | ||
Future Ventures is focused on early-stage venture capital investments. | future.ventures | Los Altos, United States |
Investor details for Commonwealth Fusion Systems
The complete investor list, round-by-round participation and investor portfolios require an active premium plan.
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People of Commonwealth Fusion Systems
105 people are tracked at Commonwealth Fusion Systems (38 in leadership, 67 in team).
| Name | Role | Group |
|---|---|---|
Bob Mumgaard | Co-Founder & CEO | Leadership |
Robert Mumgaard | Co-Founder | Leadership |
Martin Greenwald | Co-Founder | Leadership |
Dan Brunner | Co-Founder & CTO | Leadership |
Arnaud Lepert | General Manager, Superconducting | Leadership |
Brandon Sorbom | Chief Scientific Officer | Leadership |
Steve Renter | COO | Leadership |
Trent Bauserman | Head of Federal Affairs | Leadership |
Gary Stark | Head Of Construction And Support Infrastructure | Leadership |
Alex Mozdzanowska | Chief People Officer | Leadership |
Saehan Lenzen | NINT Magnets Production Director | Leadership |
Julian Soell | Chief Operating Officer | Leadership |
Kristen Cullen | Head Of Global Policy And Public Affairs | Leadership |
Darren Woulfe | Head Of Magnet Business | Leadership |
Devon Battaglia | Head Of Physics Operations For Sparc | Leadership |
Darby Dunn | Vice President Of Advanced Manufacturing & Production Strategy | Leadership |
Peter M. Winn | Head Of Tokamak Integration Systems | Leadership |
Brian Moeckly | Head Of Superconductor R&d | Leadership |
Joy Dunn | Vice President Of Operations | Leadership |
Shiyun Ruan | Head Of Special Projects | Leadership |
85 more people are available in the full profile.
Complete people profiles for Commonwealth Fusion Systems
Full employee and board profiles, team structure, tenure and professional contact details require an active premium plan.
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Timeline of Commonwealth Fusion Systems
3 dated milestones of Commonwealth Fusion Systems across 8 years, from founding to its latest funding, stage changes and deals.
- Founded Commonwealth Fusion Systems is founded.
- Funding First funding round of $64.6M.
- Funding Latest funding round, Series C, of $1.0B.
Competitors of Commonwealth Fusion Systems
Commonwealth Fusion Systems has 3 listed competitors in our database, 3 of them funded. They include Helion, TAE Technologies and Zap Energy.
| Company Name | Domain | Founded | HQ Location | Total funding | Employees | Description |
|---|---|---|---|---|---|---|
| helionenergy.com | 2010 | Redmond, United States | $977.1M | 44 | Deuterium-based magnetic-nuclear fusion reactors are developed for power generation. | |
| tae.com | 1998 | Lake Forest, United States | $1.32B | 224 | FRC nuclear fusion reactors are developed using advanced beam technology. | |
| zapenergy.com | 2017 | Everett, United States | $327.71M | Nuclear energy projects are developed in Everett, United States. |
Detailed competitors of Commonwealth Fusion Systems
The full competitor set, operating metrics and side-by-side benchmarks require an active premium plan.
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Web traffic of Commonwealth Fusion Systems
The website of Commonwealth Fusion Systems (cfs.energy) receives about 73.3K visits a month.
- Monthly visits73.3K
▲ 39.2% vs previous month
Websites whose visitors overlap most with Commonwealth Fusion Systems. Affinity shows how closely the audiences match.
| Website | Domain | Audience affinity | Monthly visits | Global rank | Profile |
|---|---|---|---|---|---|
| sparcopen.org | 100% | 25.3K | #1,225,273 | View details | |
| helionenergy.com | 97% | 82.5K | #424,478 | View details | |
| world-nuclear-news.org | 84% | #176,994 | View details | ||
| sparcinla.org | 84% | #3,489,024 | View details | ||
neimagazine.com | neimagazine.com | 84% | #567,503 | – | |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
All 9 similar websites and full traffic analytics for Commonwealth Fusion Systems
The complete similar-websites list, audience overlap and engagement analytics require an active premium plan.
- 9 similar websites
- Audience overlap
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Top companies in Nuclear & Fusion Energy
3 companies that operate in the same segment as Commonwealth Fusion Systems (Nuclear & Fusion Energy) in United States, ranked by their profile score on The Company Check.
| Company | Description | Founded | Location | Total funding | Revenue | Employees |
|---|---|---|---|---|---|---|
Developer of energy solutions | 1925 | Juno Beach, Florida, United States | USD 26.53 B | 16,800 | ||
Fuel and power producer in the nuclear energy sector | 2001 | United States | USD 307.86 M | |||
Advanced nuclear reactors are designed for low-carbon energy solutions. | 2006 | Bellevue, Washington, United States | USD 1.46 B | 299 |
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Related news about Commonwealth Fusion Systems
Complete news archive for Commonwealth Fusion Systems
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Frequently Asked Questions about Commonwealth Fusion Systems
Commonwealth Fusion Systems was founded in 2018.
Commonwealth Fusion Systems is headquartered in Cambridge, United States. It is registered at Cambridge, Massachusetts, United States.
Bob Mumgaard is the CEO of Commonwealth Fusion Systems, as recorded in our data. They have also founded this company.
Commonwealth Fusion Systems is a funded company, having raised a total of $3.93B across 7 funding rounds to date. The company's 1st funding round was a Series A of $64.59M, raised on Mar 2018.
Commonwealth Fusion Systems is engaged in the development of commercial fusion energy solutions. The company utilizes high-temperature superconducting magnets to create smaller, cost-effective tokamak fusion systems. Key projects include SPARC, a net energy fusion machine, and ARC, a future fusion power plant. Operating in the renewable energy sector, the company aims to provide clean, abundant energy to combat climate change. A global ecosystem of suppliers and researchers supports its mission to scale fusion power plants.
Commonwealth Fusion Systems's top competitors include Helion, TAE Technologies and Zap Energy.
Commonwealth Fusion Systems offers SPARC and ARC.
Commonwealth Fusion Systems has 59 investors. Key investors include Google, Mitsui & Co, Eni Next, Morgan Stanley, and Galaxy.
Commonwealth Fusion Systems operates through Commonwealth Fusion Systems.