Impulse Space Completes $500M Series D Round at $4.26B Valuation

ChainCatcher report, according to Tech Funding News, Impulse Space, a space infrastructure company founded by Tom Mueller, SpaceX’s first employee, has completed a $500 million Series D funding round co-led by 137 Ventures and BANNER VC, bringing the company’s post-money valuation to $4.26 billion. To date, Impulse Space has raised over $1 billion in total funding. Founded in 2021, Impulse Space focuses on solving spacecraft maneuvering challenges after orbital insertion. The company develops chemical propulsion spacecraft designed for rapid orbit changes, orbital transfers, and in-space maneuvers. Its Mira precision maneuvering vehicle has already completed multiple missions, while the high-energy upper stage Helios is scheduled for its first flight in 2027, aiming to rapidly deliver payloads to GEO, lunar, and heliocentric orbits. Tom Mueller, formerly SpaceX’s first employee, led the development of the Merlin engines used on Falcon 9 and the Raptor engines used on Starship. He stated that Impulse Space is not just building spacecraft—it is building the economic and technological engine that will propel humanity into space.