Commonwealth Fusion: Funding, Investors & Team (Sep 2026)
Commonwealth Fusion is a research company that develops energy through an inexhaustible power plant. It uses rare-earth barium copper oxide superconductor technology to develop energy. They combine proven physics backed by decades of government-funded fusion research with a revolutionary superconducting magnet technology to accelerate the path to commercial fusion energy Commonwealth Fusion Systems (CFS) is on track to bring fusion energy technology to the market. CFS was spun out of MIT and is collaborating with MIT’s Plasma Science and Fusion Center to leverage decades of research combined with the innovation and speed of the private sector. Supported by the investors in breakthrough energy technologies, the CFS team is uniquely positioned to deliver the fastest path to commercial fusion energy. Commonwealth Fusion began operation in 2017, with its headquarters in Cambridge in Massachusetts.
Commonwealth Fusion has raised $2.9B across 3 funding rounds on record, the most recent an undisclosed round of $1.0B announced in Jul 2026.
That round is above the $14M median round size for Energy companies tracked on FundedIQ over the last two years.
Commonwealth Fusion Company Profile and Key Stats
Latest funding round on record: Jul 2026.
Commonwealth Fusion Funding Rounds
Commonwealth Fusion raised $84.0M in an undisclosed round announced in May 2020.
1.6 years later, a Series B of $1.8B was announced in Dec 2021.
4.6 years later, an undisclosed round of $1.0B was announced in Jul 2026.
Commonwealth Fusion Investors
57 investors are recorded in total; the 5 named above are those the record identifies.
Commonwealth Fusion Founders and Leadership Team
Contact details for the Commonwealth Fusion team: 2 of 3 have an email address on file, 2 have a LinkedIn profile.
Start 14-day free trial →Commonwealth Fusion Funding Compared to Other Energy Startups
Commonwealth Fusion's latest round of $1.0B is above the median round in Energy. Medians cover the last 24 months of disclosed rounds.
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Commonwealth Fusion Funding FAQs
What does Commonwealth Fusion do?
Commonwealth Fusion is a research company that develops energy through an inexhaustible power plant. It uses rare-earth barium copper oxide superconductor technology to develop energy. They combine proven physics backed by decades of government-funded fusion research with a revolutionary superconducting magnet technology to accelerate the path to commercial fusion energy Commonwealth Fusion Systems (CFS) is on track to bring fusion energy technology to the market. CFS was spun out of MIT and is collaborating with MIT’s Plasma Science and Fusion Center to leverage decades of research combined with the innovation and speed of the private sector. Supported by the investors in breakthrough energy technologies, the CFS team is uniquely positioned to deliver the fastest path to commercial fusion energy. Commonwealth Fusion began operation in 2017, with its headquarters in Cambridge in Massachusetts.
How much funding has Commonwealth Fusion raised?
Commonwealth Fusion has raised $2.9B across 3 rounds on record. The most recent is an undisclosed round of $1.0B announced in Jul 2026.
When did Commonwealth Fusion last raise funding?
Commonwealth Fusion's most recent funding round on record is an undisclosed round of $1.0B, announced in Jul 2026.
Who has invested in Commonwealth Fusion?
Investors on record for Commonwealth Fusion include Temasek, Khosla Ventures, Coatue, HOF Capital, Safar Partners. FundedIQ records 57 investors in total.
Who founded Commonwealth Fusion?
FundedIQ lists Brianna Alleyne (Entrepreneur, Founder and Recruiter), Martin Greenwald (Cofounder) at Commonwealth Fusion.
Who is the CEO of Commonwealth Fusion?
Robert Mumgaard is listed as CEO at Commonwealth Fusion.
Where is Commonwealth Fusion headquartered?
Commonwealth Fusion is based in Cambridge, Massachusetts, United States.
How many employees does Commonwealth Fusion have?
Commonwealth Fusion is in the 101-250 employee band.
When was Commonwealth Fusion founded?
Commonwealth Fusion was founded in 2017.
How does Commonwealth Fusion's funding compare to other Energy startups?
Commonwealth Fusion's latest round of $1.0B is above the $14M median round size for Energy companies on FundedIQ across 2,284 tracked companies over the last two years.
About FundedIQ's Commonwealth Fusion Funding Data
FundedIQ tracks announced funding rounds and refreshes this profile every week. Round dates, stages and amounts are normalised to a single format, converted to US dollars, and de-duplicated: two records of the same round announced days apart are merged, and two genuinely different rounds are kept apart on the amounts they disclose. Amounts shown are the disclosed figures only — a round announced without a number is listed and excluded from the total rather than estimated.
Employee counts are reported bands, not exact headcounts. Founder and executive names carry the job title on record. Anything we do not hold for Commonwealth Fusion is left off this page rather than filled in.
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