Companies

     US-Based:

1. Astra
2. Benchmark
3. Busek
4. CU Aerospace
5. Earth Observant
6. ExoTerra
7. Kuiper
8. K2 Space
9. L3 Harris Aerojet Rocketdyne
10. Momentus
11. Northrop Grumman
12. Orbion
13. Phase Four
14. Revolution Space formerly Accion Systems
15. RocketStar formerly Miles Space
16. SpaceX
17. Space Electric Thruster Systems
18. Viridian

     International:

1. Ariane Group
2. Bellatrix Aerospace
3. COMAT
4. Enpulsion
5. Exotrail
6. Fakel
7. IHI
8. Ion-X
9. Mars Space
10. Morpheus
11. Neumann Space
12. New Orbit
13. Pale Blue
14. Rafael
15. Safran
16. ThrustMe
17. TsNIIMash