Alternatives to PHASEFOUR

Spacecraft propulsion and in-space logistics company developing water-based electric propulsion systems.

Designs, manufactures, and launches advanced rockets and spacecraft, aiming to make humanity multiplanetary.

Axiom Space is building the first commercial space station and providing human spaceflight services.

Space exploration company that achieved the first commercial moon landing.

German rocket developer aiming to scale launch operations.

Astroscale is a global leader in on-orbit servicing and space sustainability solutions.

On-demand satellite manufacturing and deployment.

Developing passively cooled modular space computers for high-powered in-orbit data processing.

Manufactures high-performance small spacecraft and components for space missions.

UK's first vertical launch spaceport for small satellites in Shetland.

Develops and manufactures small launch vehicles for rapid and reliable access to space.

SpaceFlux is developing advanced propulsion systems for in-space transportation and satellite maneuvering.

Loft Orbital provides a full-stack solution for deploying and operating microsatellites in orbit.

Designs and manufactures advanced in-space propulsion systems for satellites and spacecraft.

Provides in-space mobility solutions and electric propulsion for satellites.

European leader in space launchers and defense systems, developing and operating reliable civil and military launch vehicles.

D-Orbit Portugal is the Portuguese subsidiary of D-Orbit, a space logistics and orbital transportation company.

An end-to-end space company providing launch services, satellite manufacturing, and space systems solutions.

American aerospace company developing launch vehicles and spacecraft for commercial and government customers.

Designs and builds satellites for various missions.