US EP Companies
- Revolution Space (formerly Accion Systems)
- L3 Harris - Aerojet Rocketdyne
- Agile Space Industries
- Apogee Parent Inc. (formerly Astra)
- Benchmark Space Systems
- Blue Origin/Blue Ring
- Busek
- CU Aerospace
- Earth Observant
- Exoterra Resource
- General Galactic
- K2 Space
- Kuiper/Amazon LEO
- Orbion
- RocketStar (acquired Miles Space)
- Momentus
- Morpheus
- Muon Space (acquired Starlight Engines)
- Northrop Grumman
- Quantum Space (formerly Phase Four)
- Space Electric Thruster Systems
- SpaceX
- Stellant Inc. (formerly L-3 ETI)
- Vaxon Space
- Viridian Space
International EP Companies
- Ariane Group – Germany
- Bellatrix Aerospace – India
- Enpulsion – Austria
- Exotrail: – France
- Fakel – Russia
- IHI – Japan
- Mars Space – UK
- New Orbit: – UK
- Pale Blue – Japan
- Rafael – Israel
- Safran Group – France
- Sitael S.p.A. – Italy
- Thales – Germany
- ThrustMe – France
- TsNIIMash – Russia