Founded by Tom Mueller, SpaceX's founding employee and VP of Propulsion who designed the Merlin and Raptor engines, Impulse Space is building in-space transportation vehicles. Mira is an orbital transfer vehicle for last-mile delivery in space, while Helios is a larger high-energy upper stage designed to extend rideshare missions to GEO, cislunar, and interplanetary destinations.
| Round | Amount | Valuation | Lead Investors | Date |
|---|---|---|---|---|
| Series B | $150M | ~$450M | RTX Ventures | Jun 1, 2024 |
| Series C | $100M | $600M+ | Undisclosed | Nov 1, 2025 |
| Series C | $150M | N/A | Undisclosed | Mar 15, 2026 |