Top Nuclear Fusion startups
There are 66 Nuclear Fusion startups which include CFS, General Fusion, Proxima Fusion, TAE Technologies, Xcimer. Out of these, 41 startups are funded, with 26 having secured Series A+ funding. United States has the most number of companies in Nuclear Fusion (28), followed by United Kingdom
(7), and then Japan (4).
Over the past 10 years, an average of 3 new companies have been launched annually. Notably, several of these startups have been founded by alumni of Massachusetts Institute of Technology, University of California (Berkeley) and Imperial College London.
Here is the list of top Nuclear Fusion Startups
1. CFS
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.
Key facts about CFS
- Founded Year: 2018
- Location: Cambridge (United States)
- Stage: Series B
- Total Funding till date: $2.93B
- Investors: Tiger Global Management, Temasek and 68 Others
- Latest Funding Round: Series B, Aug 28, 2025, $*****
- Tracxn Score: 66/100 What is this?
- Competitors Rank: 1 of 49 Competitors
General Fusion is a developer of a magnetized nuclear fusion reactor. The reactor consists of 3 main components, a plasma injector, which converts hydrogen fuel into plasma & holds in a magnetic field; liquid metal wall, which compresses the plasma & captures the energy released; piston array, which collapses liquid metal vortex & shockwave formation by plasma compression. The hot liquid metal is used to operate a heat exchanger by producing power.
Key facts about General Fusion
- Founded Year: 2002
- Location: Burnaby (Canada)
- Stage: Series F
- Total Funding till date: $515M
- Investors: Chrysalix Venture Capital, GIC and 44 Others
- Latest Funding Round: Conventional Debt, Nov 27, 2025, $*****
- Tracxn Score: 66/100 What is this?
- Competitors Rank: 2 of 62 Competitors
Key facts about Proxima Fusion
- Founded Year: 2023
- Location: Munich (Germany)
- Stage: Series A
- Total Funding till date: $211M
- Investors: Balderton Capital, Redalpine and 32 Others
- Latest Funding Round: Series A, Sep 09, 2025, $*****
- Tracxn Score: 66/100 What is this?
- Competitors Rank: 3 of 48 Competitors
Developer of FRC nuclear fusion reactors. It utilizes proprietary advanced beam-driven Field Reversed Configuration (FRC) technology to create a superheated plasma environment. The phenomenon uses a closed magnetic field to hold plasma & accelerated particles due to hydrogen and boron would fusion(p-B11) & result in the generation of helium and energy.
Key facts about TAE Technologies
- Founded Year: 1998
- Location: Lake Forest (United States)
- Stage: Series G
- Total Funding till date: $1.32B
- Investors: Venrock, Google and 20 Others
- Latest Funding Round: Series G, Jun 02, 2025, $*****
- Tracxn Score: 65/100 What is this?
- Competitors Rank: 3 of 61 Competitors
5. Xcimer
Developer of laser technology for commercial inertial fusion energy systems. It focuses on building high-energy laser systems to enable inertial fusion energy. The goal is to couple plasma physics and fusion confinement concepts with a lower-cost, higher-energy laser system that can scale to commercial application. It aims to deliver the future of electricity by combining proven science with breakthrough laser technology.
Key facts about Xcimer
- Founded Year: 2021
- Location: Redwood City (United States)
- Stage: Series A
- Total Funding till date: $100M
- Investors: Hedosophia, Wireframe Ventures and 8 Others
- Latest Funding Round: Series A, Jun 04, 2024, $*****
- Tracxn Score: 64/100 What is this?
- Competitors Rank: 5 of 49 Competitors
