Impulse Space lands $500M Series D at $4.26B valuation

Impulse Space has secured a $500 million Series D funding round to accelerate development and deployment of its in-space mobility vehicles and orbital transfer spacecraft. The Redondo Beach, California-based company, founded in 2021 by former SpaceX propulsion chief Tom Mueller, is building highly maneuverable spacecraft designed to move satellites and other payloads between orbits after they reach space. The new capital brings Impulse Space’s total funding to more than $1 billion and values the company at $4.26 billion post-money.

The Series D round was co-led by 137 Ventures and Banner VC, with participation from existing backers Founders Fund and Lux Capital, as well as Linse Capital and other institutional investors. Impulse Space plans to use the funds to scale manufacturing, expand its workforce by up to hundreds of hires, and advance platforms such as its Mira spacecraft and higher-orbit transfer vehicle Helios that target commercial, civil, and national security customers. The raise cements Impulse Space as one of the highest-valued private companies in the orbital infrastructure and in-space logistics segment, reflecting growing investor conviction that in-space mobility will be a critical layer of the emerging space economy.