When was CFS founded?

CFS was founded in 2018 and raised its 1st funding round within a year of its incorporation.

Where is CFS located?

CFS is headquartered in Cambridge, United States.

How many employees does CFS have?

As of Mar 31, 2026, the latest employee count at CFS is 1075.

Is CFS a funded company?

CFS is a funded company, having raised a total of $2.93B across 6 funding rounds to date. The company's 1st funding round was a $***** Series A round, raised on Mar 15, 2018.

When was the latest funding round of CFS?

CFS's latest funding was a $***** Series B round on Aug 28, 2025, with participation from 34 investors.

Where does CFS rank among its competitors?

CFS ranks 1st amongst 41 active competitors, of which 26 are funded. It stands 1st in terms of total funding among its competitors. The most recent competitor to raise funding was LIS Technologies, which secured $7.13M in Mar, 2026.

Who are the top competitors of CFS?

CFS's top competitors include Proxima Fusion, General Fusion and TAE Technologies. Among them, LIS Technologies secured the most recent funding round in March, 2026.

CFS - 2026 Company Profile, Team, Funding & Competitors

Company Details

Provider of tokamak nuclear fusion reactors. It uses rare-earth barium copper oxide in high-field superconducting magnets for the working of compact fusion reactors.

Website: cfs.energy
Social
Email ID: *****@cfs.energy

Key Metrics

Founded Year

2018

Location

Cambridge, United States

Stage

Series B

Total Funding

$2.93B in 6 rounds

Latest Funding Round

Series B, Aug 28, 2025, $*****

Investors

Khosla Ventures & 69 more

Ranked

1^st among 41 active competitors

Employee Count

1,075 as on Mar 31, 2026

Similar Companies

ITER & 3 more

View CFS's full profile

CFS is associated with 1 legal entity given below:

Legal Entity Name	Date of Incorporation	Revenue	Latest Employee Count	Documents
COMMONWEALTH FUSION SYSTEMS LLC CIN: 6570773 , United States, Active		-	151 (As on Dec 31, 2021)	-

CFS has raised a total funding of $2.93B over 6 rounds. Its first funding round was on Mar 15, 2018. Its latest funding round was a Series B round on Aug 28, 2025 for $*****. 34 investors participated in its latest round. CFS has 64 institutional investors and 6 angel investors.

Here is the list of recent funding rounds of CFS:

Filter this list

Date of Funding	Funding Amount	Round Name	Post-Money Valuation	Revenue Multiple	Lead Investors	Other Investors
Aug 28, 2025	4696520	Series B	9165127	3896121	7147639	8373225
Dec 01, 2021	7197353	Series B	7819877	5198613	6560710	Bill Gates & 28 more
Mar 01, 2021	5411968	Grant (prize money)	5127731	8235660	5268077	OSTI

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View details of CFS's funding rounds and investors

The founders of CFS are Bob Mumgaard, Dan Brunner, Robert Mumgaard and Martin Greenwald. Bob Mumgaard is the CEO of CFS.

Here are the details of CFS's key team members:

Bob Mumgaard: Co-Founder & CEO of CFS.
Dan Brunner: Co-Founder & CTO of CFS.
Robert Mumgaard: Co-Founder of CFS.
Martin Greenwald: Co-Founder of CFS.

View details of CFS's Founder profiles and Board Members

CFS's employee count trend

CFS has 1,075 employees as of Mar 26. Here is CFS's employee count trend over the years:

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Top competitors of CFS include Proxima Fusion, General Fusion and TAE Technologies. Here is the list of Top 10 competitors of CFS, ranked by Tracxn score:

Rank	Company Details	Short Description	Total Funding	Investors	Tracxn Score
1st	CFS 2018, Cambridge (United States), Series B	Provider of tokamak nuclear fusion reactors	$2.93B	DFJ Growth, Temasek & 68 others	66/100
2nd	Proxima Fusion 2023, Munich (Germany), Series A	Developer of fusion power plants	$211M	Balderton Capital, Redalpine & 32 others	66/100
3rd	General Fusion 2002, Burnaby (Canada), Series F	Magnetized nuclear fusion reactor developer	$515M	Chrysalix Venture Capital, Temasek & 44 others	65/100
4th	TAE Technologies 1998, Lake Forest (United States), Series G	Developer of FRC nuclear fusion reactors	$1.32B	New Enterprise Associates, Google & 20 others	65/100
5th	Xcimer 2021, Redwood City (United States), Series A	Developer of laser technology for commercial inertial fusion energy systems	$100M	Hedosophia, Wireframe Ventures & 8 others	63/100
6th	LIS Technologies 2023, New York City (United States), Series A	Provider of laser isotope separation technologies optimized for uranium (HALEU) power generation	$71.6M	28 Ventures, Innovating Capital & 2 others	62/100
7th	SHINE Technologies 2005, Janesville (United States), Series D	Producer of nuclear isotopes using fusion techniques	$654M	Fidelity Investments, Deerfield & 14 others	60/100
8th	Zap Energy 2017, Everett (United States), Series D	Developer of nuclear energy projects	$330M	Chevron Technology Ventures, Soros Fund Management ... & 15 others	59/100
9th	Helion 2010, Everett (United States), Series F	Provider of deuterium fuel-based magnetic-nuclear fusion reactor	$977M	Mithril, Y Combinator & 15 others	59/100
10th	Kyoto Fusioneering 2019, Uji (Japan), Series C	Provider of nuclear fusion reactor technology based on low-energy nuclear reaction technology	$120M	JIC Venture Growth Investments, Coral Capital ... & 34 others	59/100