The four-year-old startup, backed by $181M in equity and credit, opened a 10x-larger manufacturing facility in San Jose on June 22 — and is claiming 500-satellite-per-year capacity from a company that's built eight total.

Muon Space cut the ribbon Monday on a 130,000-square-foot satellite manufacturing facility at 5970 Optical Court in San Jose's Optical Tech Park — a tenfold expansion from its prior Mountain View footprint, and the biggest operational commitment the four-year-old startup has made since it was founded in 2021.

The facility's specs are specific: 70,000 square feet of manufacturing floor, 30,000 square feet of cleanrooms ranging from Class 10 through 100,000, and a 300-kilowatt solar array. Muon says it can eventually produce 500 satellites per year in the 100-kilogram to 1,500-plus-kilogram class; the nearer-term target, per its own releases via BusinessWire, is roughly 100 per year by end of 2027.

The cap-table reality behind the expansion: Muon has raised approximately $136 million in equity across four tranches — a $10 million seed led by Costanoa Ventures in October 2021; a $25 million Series A led by Radical Ventures in June 2022; a $56.7 million Series B first close led by Activate Capital in August 2024; and a $44.5 million Series B extension led by Congruent Ventures in June 2025 — plus $45 million in credit facilities, totaling roughly $181 million all-in. EDGAR shows one Form D for Muon Space Inc. (CIK 0001932309, accession 0001932309-22-000001, filed June 2022); the later rounds haven't surfaced in the public filing record as of Tuesday.

What the company has actually shipped to orbit: eight spacecraft total as of the ribbon-cutting, with 20 satellites manifested for launch over the next 20 months. The missions in operation include the SNC Vindlér 2.0 RF-data constellation (three satellites live), the FireSat wildfire-detection protoflight (launched March 2025, backed by a $26 million Bezos Earth Fund grant), and an Air Force weather satellite prototype. A Starlink Mini space-laser integration deal with SpaceX targets a first Halo satellite launch in Q1 2027. Muon also acquired propulsion startup Starlight Engines in 2025 to bring Hall-effect thrusters in-house.

The company is at roughly 150 employees with 40-plus open roles; it hasn't disclosed a specific job-creation figure for the San Jose site.

The factory is real, the funding is documented, and the government contracts give it runway most Series B hardware startups don't have. The number that matters next is how fast Muon closes the gap between eight spacecraft and a hundred a year. The first EDGAR Form D for its $146 million Series B hasn't been filed as of today — worth watching for investor details the press releases don't include.