Portal Space Systems was founded by Jeff Thornburg, who serves as CEO and CTO and previously led development of SpaceX's Raptor engine, along with a team of aerospace veterans drawn from Blue Origin, Amazon's Kuiper program, and NATO space programs. The company is headquartered in Bothell, Washington, where it operates an R&D facility, and it focuses on a capability the U.S. military and commercial operators increasingly prioritize: the ability to maneuver freely and rapidly in space.
Most satellites carry very limited propellant and can make only small, slow orbital adjustments. Portal's core innovation is solar-thermal propulsion (STP), which uses concentrated sunlight to heat propellant and deliver sustained, high-efficiency thrust. This enables its spacecraft to change orbits, inspect other objects, and reposition on demand, turning agility into an operational advantage.
The company's flagship Supernova spacecraft is designed for 'orbital mobility' across multiple regimes, supporting missions such as space domain awareness, on-orbit inspection, responsive repositioning, and servicing for national-security, civil, and commercial customers. By making maneuver cheap and abundant, Portal aims to change how operators think about persistence and survivability in contested orbits.
Portal raised a $17.5M oversubscribed seed round in 2025 led by AlleyCorp, then a $50M Series A announced in April 2026 led by Geodesic Capital and Mach33, with participation from Booz Allen Ventures, ARK Invest, AlleyCorp, and FUSE. It was also awarded a $45M Strategic Funding Increase (STRATFI) from the U.S. Air Force in 2024. The funding supports development and launch of its first orbital vehicle built for rapid maneuvers.