Phase Four, Inc.

Based in the US, Phase Four LLC specializes in advanced in-space satellite electric propulsion systems, offering innovative solutions for satellite maneuvering and deep-space missions. Founded in 2015 and headquartered in Hawthorne, US, Phase Four LLC focuses on the design and manufacture of electric propulsion systems. In January 2024, Phase Four, Inc. raised USD 12.

93 million in series C funding from Artemis Group Capital. Steve Kiser serving as CEO. The series C funding values Phase Four, Inc. at USD 79.

14 million post-money. Phase Four specializes in the design, manufacture, and servicing of advanced in-space satellite electric propulsion systems. Their core product, the Valkyrie Thruster, utilizes NASA-licensed Hall-effect Thruster technology and is optimized for performance in low Earth orbit (LEO) and Cis-Lunar environments. This thruster provides significant advantages in thrust, efficiency, and total impulse, suitable for various missions, including satellite maneuvering and deep-space exploration.

Additionally, the company offers services like propellant loading, storage, fill operations, and software solutions, targeting commercial satellite operators, government agencies, and research institutions across North America, Europe, and Asia. Phase Four's revenue model is based on direct sales of its propulsion systems and related services, catering to B2B clients such as satellite manufacturers and government space agencies. The Valkyrie Thruster is available for order with a delivery timeline of about ten months post-order, allowing clear transactional timelines with clients. The company also enters into longer-term service agreements that encompass propellant logistics and ongoing support, creating a consistent revenue stream from partnerships and collaborations outlined in memoranda of understanding.

Pricing for products and services is customized to meet specific client needs. In January 2025, Phase Four, Inc. raised an undisclosed amount in a Series C funding round led by Artemis Group. The company plans to utilize this funding to expand manufacturing capabilities, accelerate production of its Valkyrie Hall Effect Thrusters, and enhance research and development efforts.

Additionally, Phase Four aims to strengthen strategic partnerships in the space sector, positioning itself for future growth and market expansion.