Impulse Space closed a $308 million Series D extension on September 16, taking the round started in June to $808 million total and lifting the Redondo Beach in-space mobility company's lifetime funding above $1 billion at a reported $5.6 billion valuation.
Booked Backlog Pulled The Extension Forward
The extension comes barely three months after Impulse's original $500 million Series D in June, which was led by 137 Ventures and BANNER VC with Founders Fund, Lux Capital and Linse Capital. President and COO Eric Romo said investor interest never stopped after the June round wrapped, letting Impulse re-open the book to fund a mission backlog customers have already booked into 2027 and beyond. Founder and CEO Tom Mueller, the former SpaceX propulsion chief who left in 2020 to start Impulse, has publicly framed the company's target as high-volume, high-thrust orbital transfer at economics that make GEO and cislunar delivery routine.
Redondo Beach Buildout And New Hiring
A big chunk of the money will underwrite Impulse's move into a 250,000-square-foot production facility at 2425 Manhattan Beach Boulevard, formerly a Northrop Grumman site down the street from Impulse's current headquarters. The company plans to relocate manufacturing there and add up to 200 employees on top of the roughly 500 it already runs locally. That footprint is sized for a ramp of the Mira orbital transfer vehicle, which has already flown two LEO Express missions and set orbital-maneuvering records, and for the debut of Helios, the high-energy Deneb-powered kick stage aimed at MEO, GEO, lunar and planetary destinations with a first flight targeted for 2026.
Where Impulse Fits In The National Launch Book
Impulse has become one of the most active winners of new U.S. government launch business. The Space Force tripled the ceiling of NSSL Phase 3 Lane 1 to $17B in July, and added Impulse and Relativity Federal to that $5.6B roster the same month, opening the door for the company to bid alongside SpaceX, ULA and Blue Origin on national-security missions. Its June $500M Series D valued the company at $4.26B; today's extension puts it 27% higher just three months later.
Reporting based on coverage from Impulse Space's September 16 announcement via GlobeNewswire, Reuters, SatNews and Redondo Beach Patch.