Impulse Space has raised $500 million in a Series D co-led by 137 Ventures and BANNER VC, bringing total funding to over $1 billion.
The round values the company at $4.26 billion — and comes just one year after its $300 million Series C, signalling sharply accelerating investor conviction in post-launch orbital infrastructure.
With three missions flown, hundreds of millions in customer contracts, and 200+ open roles, Impulse is the only well-capitalised private company building chemical propulsion spacecraft purpose-designed for rapid orbit changes at scale.
For two decades, Tom Mueller built the rocket engines that got things into orbit — the Merlin that powers every Falcon 9 and the Raptor that powers Starship. He was SpaceX’s first employee, recruited by Elon Musk in 2002 after Musk found him test-firing a 13,000-pound-thrust engine he had built in his garage. Now Mueller has turned his attention to the problem that comes after launch: what happens when your spacecraft is in the wrong orbit, or needs to move.
Redondo Beach, California-based Impulse Space has raised $500 million in a Series D co-led by 137 Ventures — the San Francisco growth firm that has backed SpaceX across roughly two dozen rounds since 2010 and recently closed $700 million in new funds — and BANNER VC, with additional participation from returning investors Founder’s Fund, Lux Capital, and Linse Capital. The round values Impulse at $4.26 billion post-money. Total funding now exceeds $1 billion, following a $300 million Series C led by Linse Capital just one year ago.
