Marathon Fusion
Updated: September 12, 2026
CEO - Kyle Schiller
Country: USA | Funding: $6.9M (+)
Founded: 2023
Website: https://www.marathonfusion.com/
Marathon Fusion designs, engineers and scales next-generation technologies to enable the deployment of fusion power plants. In deuterium-tritium fusion, high-energy neutrons drive "multiplication" reactions to close the fuel cycle by producing the tritium needed to sustain operation. Making use of those neutrons to drive a multiplication reaction on mercury-198, startup's approach produces mercury-197 which then decays in a few days to the only stable isotope of gold. Using Marathon's approach, power plants can generate five thousand kilograms of "gold" per year, per gigawatt of electricity generation.
Founded: 2023
Website: https://www.marathonfusion.com/
Marathon Fusion designs, engineers and scales next-generation technologies to enable the deployment of fusion power plants. In deuterium-tritium fusion, high-energy neutrons drive "multiplication" reactions to close the fuel cycle by producing the tritium needed to sustain operation. Making use of those neutrons to drive a multiplication reaction on mercury-198, startup's approach produces mercury-197 which then decays in a few days to the only stable isotope of gold. Using Marathon's approach, power plants can generate five thousand kilograms of "gold" per year, per gigawatt of electricity generation.
