Phase Four

Positioning

Phase Four was a Hawthorne, California space-propulsion company developing Maxwell RF plasma thrusters, Valkyrie Hall-effect propulsion, and AFRL-supported multimode chemical/electric propulsion. In September 2025, Quantum Space acquired Phase Four's multimode propulsion assets and Los Angeles integration-and-test facility for use in Ranger spacecraft, while Apex separately acquired Phase Four's Hall-effect thruster technology in August 2025. The transactions indicate that Phase Four's technology and facility were absorbed by other companies rather than continuing as an independent propulsion supplier. — acquired by Quantum Space and Apex (2025-09-22)

Latest signals

• 22 Oct 2025Quantum Space is developing the Ranger 2000 spacecraft with a 2,000-kilogram payload capacity.Payload
• 22 Oct 2025Quantum Space acquired Phase Four's propulsion technology for $40 million.Payload
• 22 Sept 2025Quantum Space raised a $40 million Series A extension.Payload
• 22 Sept 2025Apex purchased Phase Four’s Hall-effect thruster technology, hardware, and personnel.Payload
• 22 Sept 2025Quantum Space acquired Phase Four’s multi-modal propulsion technology and Hawthorne integration facility.Payload

8 signals name Phase Four. Members see all of them, filtered by topic, source and date.

Facts, with sources

• 12 May 2026Multimode propulsion technology at Quantum Space's Hawthorne, CA facilityDeployment · SpaceNews
• 22 Apr 2026Acquired by Quantum Space; propulsion assets transferredOwnership change · SpaceNews
• 22 Oct 2025Quantum Space acquired Phase Four's propulsion technologyOwnership change · Payload
• 22 Sept 2025Series A extensionFunding round · Payload

17 facts on file. Members see all of them with the source link.

Scores, Space (of 10)

Traction: deployment, production, commercials, progress. Capability: technology, positioning, firepower, leverage.

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