Impulse Space
Impulse Space is a Launch Vehicles company founded in 2021 and based in Redondo Beach, United States. It has raised $1.0B in total funding, most recently a Series D in 2026 at a $4.3B valuation.
Impulse Space was founded in 2021 by Tom Mueller, a SpaceX founding employee and the architect of its Merlin engine family. The company builds in-space mobility hardware: its Mira maneuverable space vehicle hosts and deploys payloads across orbits and has flown two customer missions, while its Helios high-energy kick stage, powered by the Deneb engine, is designed to move payloads from low Earth orbit to MEO, GEO, lunar, and planetary destinations, targeting a first flight in 2026. In June 2026 Impulse closed a $500 million Series D co-led by 137 Ventures and Banner VC at a $4.26 billion valuation, with participation from Founders Fund, Lux Capital, and Linse Capital, bringing total capital raised to more than $1 billion.
Impulse is betting that the bottleneck in space is no longer reaching orbit but moving precisely between orbits, the 'last mile' of spaceflight.
At a glance
Total raised
$1.0B
Headcount
201-500
Headquarters
Redondo Beach
United StatesFounded
2021
Status
Private
Latest valuation
Where Impulse Space ranks
Top 25 Space Tech companies →Funding history
Total raised
$1.0B
Rounds tracked
1
Latest stage
Series D
Latest valuation
$4.3B
| Date | Stage | Amount | Valuation | Lead investors |
|---|---|---|---|---|
| Jun 2, 2026 | Series D | $500M | $4.3B | 137 Ventures, Banner VC |
