# Portal Space Systems announced a $50 million Series A funding round that values the company at $250 million.

*aerospace · news · 2026-04-09 · TechCrunch*

## Key points

- Portal Space Systems is developing solar thermal propulsion, a technology previously set aside by NASA.
- The company has raised $50 million in Series A funding, valuing it at $250 million.
- Portal has already secured $45 million in strategic funding from the U.S. military for orbital warfare applications.
- Portal's Hex thruster combines solar concentrator and nozzle, enabled by recent advances in additive manufacturing.
- Portal's technology could accelerate development of nuclear thermal propulsion by proving key components in orbit.

**Companies:** SpaceX, Booz Allen Ventures, ARK Invest, Mach33, Portal Space Systems, Geodesic Capital, AlleyCorp, FUSE
**Countries:** United States

[Read the full story on TechCrunch](https://techcrunch.com/2026/04/09/portal-raises-50-million-to-build-a-new-kind-of-high-power-rocket-engine/)

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