Portal Space Systems develops spacecraft propulsion and mobility technology for rapid, high-delta-v in-space maneuverability. Its flagship Supernova spacecraft bus uses a novel solar-thermal propulsion system intended to deliver nuclear-comparable thrust performance without a reactor, supporting satellite servicing, refueling, and national-security missions. Founded by Jeff Thornburg, Ian Vorbach, and Prashaanth Ravindran, the company is headquartered near Seattle and has raised roughly $70.5M, including work with the U.S. Space Force.
Company data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Founded
2021
Employees
11–50
Total Funding
$67.5M
2 rounds
Latest Valuation
$0.25B
Apr 9, 2026
Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Total raised $67.5M across 2 rounds
Last updated 06-25-2026
| Date | Round | Amount Raised | Valuation | Lead Investors |
|---|---|---|---|---|
| Apr 9, 2026 | Series A TechCrunch | $50M | $0.25B | Geodesic Capital, Mach33 |
| Apr 3, 2025 | Seed | $17.5M | — | AlleyCorp |
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