Portal Space Systems Raises $50M to Advance Rapid-Maneuver Spacecraft

Portal Space Systems Raises $50M Series A to Advance Rapid-Maneuver Spacecraft

Portal Space Systems has raised $50 million in a Series A round led by Geodesic Capital and Mach33 Financial Group, with participation from Booz Allen Hamilton Ventures, ARK Investment Management LLC, AlleyCorp, and Fuse VC.

The funding will support development and scaling of the company’s maneuverable spacecraft designed for rapid orbital mobility.

Founded in 2021 by CEO Jeff Thornburg, a former engineer at SpaceX and Stratolaunch, Portal is preparing to launch its first spacecraft, Starburst-1, later this year aboard a rideshare mission.

The company is also expanding into a new manufacturing facility to support production of its Starburst and next-generation Supernova vehicles.

Portal’s technology centers on enabling faster orbital maneuvering compared to traditional propulsion systems.

Its upcoming Supernova spacecraft will use solar thermal propulsion, leveraging concentrated sunlight to heat propellant and significantly reduce the time required for orbital adjustments—from months to potentially hours or days.

Starburst, while using more conventional propulsion, incorporates many of the same underlying systems.

The company has already conducted early testing through prototype missions and plans to launch its first full-scale Supernova vehicle next year, supported in part by funding from the U.S. Space Force.

Portal is targeting applications across defense and commercial markets, including space domain awareness, satellite maneuverability, and orbital debris management.

With growing customer interest and partnerships emerging in areas such as debris tracking and in-orbit services, Portal aims to scale production to multiple spacecraft per month by 2027. The company positions rapid mobility as a key capability for future space operations, particularly as activity in Earth orbit and beyond continues to increase.