Helion Energy is a fusion power company aiming to build the world's first fusion power plant.

Commonwealth Fusion Systems is a Cambridge, Massachusetts-based research and development company developing fusion power systems based on ARC tokamak reactors.

Avalanche Energy Designs is an American start-up company designing, testing, and building micro-fusion reactors.

First Light Fusion is a clean energy producer founded in 2011 by Nicholas Hawker.

Tokamak Energy is a fusion energy producer founded in 2009 by Alan Sykes, David Kingham and Mikhail Gryaznevich.

Nuclear fusion start-up in Europe researching high-temperature superconductors to simplify the construction of Stellarator devices as well as other applications in medical imaging.

Zap Energy is developing compact fusion power that doesn't require magnets or lasers.

HelicitySpace is a fusion propulsion and power company, developing technology for spacecraft.

A company developing its own petawatt class and high energy laser system coupled with a sophisticated target physics infrastructure exclusively dedicated to commercial "neutron-lean" fusion energy.

Company that has developed and operates the world's first continuous-operation enabled, superconducting, high-beta style fusion research device.

A nuclear fusion research company based in Tempe, Arizona.

TAE Technologies, Inc., formerly known as Tri Alpha Energy, is a California-based renewable energy company focused on developing commercial fusion energy.