# Commonwealth Fusion Systems funding rounds and investors

As of 13 Oct 2026, Commonwealth Fusion Systems has raised $3.78B across 4 verified rounds on record; latest: $1 billion funding round, announced 30 Jul 2026.

Commonwealth Fusion Systems sells advanced fusion energy technology, particularly high-temperature superconducting magnets and fusion power plants, targeting energy providers and stakeholders in the clean energy sector.

Website: https://cfs.energy/  
Headquarters: Devens, Massachusetts  
Page: https://fireround.dev/companies/cfs.energy

## Verified rounds

| Announced | Round | Amount | Lead investors | Other investors | Sources |
| --- | --- | --- | --- | --- | --- |
| 2026-07-30 | Funding round | $1 billion | not stated | none named | [cfs.energy](https://cfs.energy/news-and-media/commonwealth-fusion-systems-raises-another-1-billion-bringing-total-capital-raised-to-4-billion), [prnewswire.com](https://www.prnewswire.com/news-releases/commonwealth-fusion-systems-raises-another-1-billion-bringing-total-capital-raised-to-4-billion-302837638.html) |
| 2025-08-28 | Series B | $863 million | Mitsui &, Mitsubishi Corporation | Brevan Howard Macro Venture, Counterpoint Global (Morgan Stanley), Stanley Druckenmiller, FFA Private Bank (Dubai), Galaxy Interactive, Gigascale Capital, HOF Capital, Neva SGR (Intesa Sanpaolo Bank), NVentures, Planet First Partners, Woori Venture Partners US, Development Bank of Japan, Fujikura, JERA Ventures, JGC Japan, Mitsui Fudosan, NTT Group, Sumitomo Mitsui Banking, Sumitomo Mitsui Trust Bank, The Kansai Electric Power Co, Breakthrough Energy Ventures, Emerson Collective, Eni, Future Fund, Gates Frontier, Google, Hostplus Superannuation Fund, Khosla Ventures, Lowercarbon Capital, Safar Partners, Eric Schmidt, Starlight Ventures, Tiger Global Management | [prnewswire.com](https://www.prnewswire.com/news-releases/commonwealth-fusion-systems-raises-863-million-series-b2-round-to-accelerate-the-commercialization-of-fusion-energy-302540730.html) |
| 2021-12-01 | Series B | $1.8 billion | Tiger Global Management | Bill Gates, Coatue, DFJ Growth, Emerson Collective, Footprint Coalition, Google, JIMCO Technology Fund, John Doerr, JS Capital, Marc Benioff’s Time Ventures, Senator Investment Group, Breakthrough Energy Ventures, The Engine, Eni, Equinor Ventures, Fine Structure Ventures, Future Fund, Hostplus, Khosla Ventures, Lowercarbon Capital, Moore Strategic Ventures, Safar Partners, Schooner Capital, Soros Fund Management, Starlight Ventures, Temasek | [prnewswire.com](https://www.prnewswire.com/news-releases/commonwealth-fusion-systems-raises-1-8-billion-in-funding-to-commercialize-fusion-energy-301434560.html) |
| 2019-06-27 | Series A | $115 million | not stated | Eni, Future Fund, Khosla Ventures, Lowercase Capital, Moore Strategic Ventures, Safar Partners, Schooner Capital, Starlight Ventures | [cfs.energy](https://www.cfs.energy/news-and-media/close-series-a-round), [bostonglobe.com](https://www.bostonglobe.com/business/2019/06/27/cambridge-fusion-energy-startup-completes-million-funding-round/Wjl7EuI8sBNbjhp96NY0VK/story.html) |

Source: Fireround (https://fireround.dev), an open-source funding feed. Each round is checked against the pages listed with it.