US EP Companies
- Accion
- Aerojet Rocketdyne
- Astra
- Busek
- CU Aerospace
- Earth Observant
- Exotrail
- Kuiper
- Orbion
- Miles Space
- Momentus
- Morpheus
- Northrop Grumman
- Phase Four
- Revolution Space
- Space Electric Thruster Systems
- SpaceX
- Stellant
- Vaxon
- Viridian Space
International EP Companies
- Ariane Group – Germany
- Bellatrix Aerospace – India
- Enpulsion – Austria
- Exotrail – France
- Fakel - Russia
- IHI – Japan
- Mars Space – United Kingdom
- New Orbit
- Rafael – Israel
- Safran Group – France
- ThrustMe - France
- TsNIIMash - Russia