Phase Four

Phase Four manufactures propulsion systems for space applications, developing plasma propulsion systems for small satellites including electrodeless RF thrusters and iodine-based plasma propulsion. Founded in 2015 and headquartered in Pasadena, United States, Phase Four has raised approximately $43.6M in Series C funding from investors including Veteran Ventures Capital, AFWERX, Alsop Louie Partners, and New Science Ventures. The company employs 23 people and serves the growing small satellite market with propulsion systems that enable orbit adjustment, station-keeping, and end-of-life deorbiting. Phase Four's RF plasma technology offers advantages over traditional electric propulsion by eliminating electrode erosion, extending thruster lifetime and enabling use of alternative propellants like iodine.