TLDR
- Impulse Space raised $500 million in a Series D round, valuing it at $4.26 billion
- Total capital raised now exceeds $1 billion, co-led by 137 Ventures and Banner VC
- Founded by Tom Mueller, SpaceX’s first employee and former propulsion chief
- The company has flown three missions and holds hundreds of millions in contracts
- SpaceX’s expected IPO has boosted investor interest in space startups
Impulse Space, a California-based startup that moves satellites around in orbit after launch, has raised $500 million in a Series D funding round. The round values the company at $4.26 billion.
We've raised a $500 million Series D to continue solving the next big challenge in space: movement beyond launch.
With over $1 billion in total capital raised, our team and our production are scaling aggressively to accelerate humanity’s future beyond Earth.
Read more:… pic.twitter.com/UKRBKaE4B2
— Impulse Space (@GoToImpulse) June 2, 2026
The funding was co-led by venture firms 137 Ventures and Banner VC. Other investors include Founders Fund, Lux Capital, and Linse Capital. Total capital raised by the company now exceeds $1 billion.
The company was founded by Tom Mueller, who was SpaceX’s first employee. Mueller led development of the rocket engines that helped SpaceX become the world’s leading launch provider. He now serves as CEO of Impulse Space.
What Impulse Space Actually Does
Impulse builds what are called orbital transfer vehicles. These are spacecraft that take satellites from one orbit to another after they have already launched into space.
“Launch has pretty much been solved. The challenge now is getting everywhere else beyond low Earth orbit,” Mueller told Reuters.
The company currently operates two main products. Mira is a maneuvering spacecraft already operating in orbit. It has completed autonomous rendezvous operations and orbit changes. Helios is a larger transfer vehicle scheduled for its first flight in 2027.
Impulse says its Helios vehicle can get a satellite to its final orbit the same day it launches on a Falcon 9. Without it, that same trip could take six to ten months.
The company is also developing three propulsion systems: Saiph for orbital repositioning, Deneb for long-distance transport, and Rigel for landers. Its Caravan rideshare program is designed to lower the cost of reaching higher-energy orbits.
Impulse has flown three missions and holds hundreds of millions of dollars in customer contracts across commercial, government, and civil sectors.
Growth and the SpaceX IPO Effect
The company is based in Redondo Beach, California, and has expanded facilities in Boulder, Washington D.C., and Mojave. It has more than doubled its headcount in the past year and currently has over 200 open positions.
Investor interest in the space sector has risen since SpaceX filed last month for what could be the largest IPO in history. That filing included plans covering Starlink, artificial intelligence infrastructure, and reusable Starship rockets.
SpaceX’s IPO filing has drawn fresh attention to startups led by former SpaceX engineers and executives. Impulse Space is one of several companies in that wave.
The funding will go toward hiring and expanding manufacturing as Impulse scales production of its spacecraft and propulsion systems.
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