Phase Four

Defense and Space ManufacturingCalifornia, United States11-50 Employees

Phase Four is a defense and space manufacturing company based in Hawthorne, California, that concentrates on satellite propulsion. The business aims to support the rapid expansion of satellite constellations by addressing the propulsion subsystem, a historically costly and high‑risk part of spacecraft design. Its approach emphasizes reliability and manufacturability by reducing common failure points and simplifying fabrication compared with legacy systems. The customers it serves are satellite operators and spacecraft developers seeking dependable propulsion with shorter lead times. In 2023, Phase Four announced the Maxwell Block 3 turn-key propulsion thruster, reflecting ongoing product development.

The company describes its propulsion solution as delivering performance comparable to traditional options at a lower price and with faster delivery, while offering a longer expected lifespan. This aligns with a focus on enabling broader maneuverability and operation for small to mid-sized satellite fleets. Within the defense and space manufacturing sector, Phase Four remains a relatively small firm concentrating on advancing its propulsion technology.

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