Portal Space Systems – Space Economy Intel

Key Events

Apr 9, 2026 Success

Portal Space Systems Raises $50M Series A for Solar Thermal Propulsion Scale-Up

Portal Space Systems closed a $50M Series A on April 9, 2026, led by Geodesic Capital and Mach33, with Booz Allen Ventures, ARK Invest, AlleyCorp, and FUSE participating, valuing the company at $250M. Total funding including $45M in prior military strategic investment now stands at ~$117.5M. Capital will fund headcount scaling to ~100, a 52,000 sq ft Bothell manufacturing facility, and Starburst-1 launch preparation for SpaceX Transporter-18 in Q4 2026. Portal's HEX Thruster (Flare) passed thermal vacuum testing at operational temperatures in September 2025 — the first commercial solar thermal propulsion test. Starburst-1 will demonstrate rendezvous and proximity operations (RPO) and rapid retasking.

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Key People

Jeff Thornburg

CEO & Co-Founder, Portal Space Systems

Hardware Fleet

Starburst-1 Unknown

other

Portal Space Systems' first ESPA-class spacecraft. Manifested on SpaceX Transporter-18 (Q4 2026) for a year-long SSO mission demonstrating rendezvous and proximity operations, rapid retasking, and significant orbital maneuverability. Carries TRL11 video camera and Zenno Space superconducting magnetic actuator as customer payloads. 80% of components shared with Supernova.