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Transmutex

Subcritical nuclear reactors with thorium fuels

Overview

Transmutex builds subcritical, accelerator-driven nuclear energy systems for civilian use. A particle accelerator works with a nuclear fuel assembly to create a non-self-sustaining fission reaction that can be halted in under 2 milliseconds, enabling modular plants from about 220 MWe up to over 1 GWe and supporting fuels like thorium. Besides power generation, the platform can destroy long-lived radioactive waste and burn legacy uranium waste, while offering high-energy physics software and isotope production capabilities. The goal is to provide safe, affordable, carbon-free base-load power at scale, with minimized proliferation risk and productive uses for nuclear waste and isotopes.

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About Transmutex

Simplify's Rating
Why Transmutex is rated
C
Rated B on Competitive Edge
Rated C on Growth Potential
Rated D+ on Differentiation

Industries

HardwareIndustrial & ManufacturingEnergyEnterprise Software

Company Size

51-200

Company Stage

Grant

Total Funding

$43.5M

Headquarters

Vernier, Switzerland

Founded

2019

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Simplify's take

What believers are saying

  • ARPA-E awarded Transmutex $4.293 million in January 2025 for Los Alamos work.
  • Viam partnered with Transmutex in July 2025 to improve ion-source reliability.
  • CNIC welcomed Transmutex in June 2026, strengthening its isotope-production market access.

What critics are saying

  • Nagra publicly distanced itself in 2024, signaling credibility risk in Switzerland.
  • Transmutex had zero 2026 job postings and 61 employees, suggesting commercialization strain.
  • NRC licensing remains unresolved in 2026; a bridge from DOE authorization still blocks deployment.

What makes Transmutex unique

  • Transmutex pairs accelerator-driven transmutation with isotope production, unlike reactor-only nuclear startups.
  • Its START system targets waste reduction and safer shutdown, not just electricity generation.
  • Founded by former CERN physicists, Transmutex brings particle-physics engineering to nuclear commercialization.

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Funding

Total Funding

$43.5M

Meets

Industry Average

Funded Over

5 Rounds

Grant funding comparison data is currently unavailable. We're working to provide this information soon!
Grant Funding Comparison Coming Soon

Benefits

  • Disability Insurance
  • Remote Work Options
  • Paid Vacation

Company News

HR TODAY
Mar 31st, 2025
Craig Kelly Appointed as Chief Financial Officer at Transmutex

Geneva, Switzerland, March 2025 - Craig Kelly has joined Transmutex as Chief Financial Officer, bringing with him over three decades of experience in corporate finance, structured investments, and financial strategy.

StartupTicker
Jan 22nd, 2025
Transmutex Receives $4 Million Grant To Enable Nuclear Waste Transmutation

Geneva-based startup Transmutex has received more than $4.2 million from the U.S. Department of Energy Advanced Research Projects Agency-Energy as part of the NEWTON Program. The funds will finance a project in Los Alamos aiming to enable nuclear waste transmutation to transform long-lived radioactive elements into shorter-lived ones, reducing their hazardous lifetime from 1 million years to a few hundred years.The U.S. Department of Energy's Advanced Research Projects Agency-Energy (ARPA-E) has allocated $40 million to fund 11 projects focused on developing transmutation technologies aimed at minimizing the impact of used nuclear fuel (UNF) in permanent storage. Transmutation involves changing an isotope into a different isotope or element through a nuclear reaction. Under the Nuclear Energy Waste Transmutation Optimized Now (NEWTON) program, ARPA-E will support efforts to create transmutation technologies that could greatly reduce the mass, volume, activity, and effective half-life of the current stockpile of commercial UNF, potentially transforming the disposal of UNF from a long-term, intergenerational challenge into a more immediate, intragenerational issue

Brown Brothers Media
Jul 11th, 2024
Top European Nuclear Energy Startups That You Should Know In 2024

The world is shifting to green energy sources to reduce carbon emissions and halt climate risks. Thus, developing new technologies for these energy sources is important to accelerate the transition.Many European startups developing nuclear technology have entered the market. Old nuclear technology has many shortcomings that these startups see as a chance to create innovative approaches. The nuclear startup sector has grown substantially these past few years, backed by numerous investments and an army of scientists and engineers.Europe is where many startups are thriving, as it has an excellent growth environment. Here is a list of thriving nuclear startups to anticipate in 2024.ThorizonFounder(s): Sander de Groot and Lucas PoolYear founded: 2018Hiring: Yes, check job opportunities here- A message from our partner -The Amsterdam-based nuclear energy startup Thorizon is developing a reactor that runs on molten salt. The company claims its technology is safe, smart, and circular and does not waste energy

BioAlps
Jan 30th, 2024
Transmutex raises CHF 20 Million

Geneva-based nuclear engineering company Transmutex has secured CHF 20 Million in financing from New York-based venture capital funds Union Square Ventures and Steel Atlasm.

ThePrint
Jan 30th, 2024
Geneva-based Transmutex SA, raises over CHF 20M in Series A extension to further develop and commercialize its subcritical nuclear energy system

Geneva-based Transmutex SA, raises over CHF 20M in Series A extension to further develop and commercialize its subcritical nuclear energy system.

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