Companies US-Based:AccionAerojet RocketdyneAstraBusekCU AerospaceEarth ObservantExoTerraKuiperK2 SpaceOrbionMiles SpaceMomentusMorpheusNewOrbitNorthrop GrummanPhase FourSpace Electric Thruster SystemsSpaceXViridian International:Ariane GroupBellatrix AerospaceCOMATEnpulsionExotrailFakelIHIIon-XMars SpaceNeumann SpaceNew OrbitPale BlueRafaelSafranThrustMeTsNIIMash