Impulse Space raises $500 million at $4.26 billion valuation as space investing surges

Impulse Space raised $500 million in a Series D at a $4.26 billion valuation, taking its total funding past $1 billion.
Founded by Tom Mueller — SpaceX’s first employee and former propulsion lead — the startup is part of a wave of SpaceX alumni attracting investor buzz.
The company builds orbital transfer vehicles (Mira in orbit; Helios due 2027) that can reposition satellites much faster — promising same‑day moves instead of months.