Muon Space, a four-year-old small satellite manufacturer, announced a significant boost to its operations with $89.5 million in new funding. This investment, secured on June 12, will be used to scale production and acquire the propulsion startup, Starlight Engines. The Series B funding round brings the company’s total to $146 million, following a previous $56.7 million round last year.
This substantial investment will allow Muon Space to expand its workforce, currently standing at 150 employees (a 50% increase since December), and build new facilities capable of producing 500 satellites annually in the 100–500+ kilogram class. CEO Jonny Dyer stated, “We’re seeing clear demand signals from new and existing customers in both commercial and government sectors, and this expansion is designed to meet that demand and stay ahead of it.” He further projected, “By the end of 2027, we expect to be meeting demand for around 100 satellites per year. While this is part of a long-term strategy, it’s grounded in current contracts and pipeline planning.”
Muon Space has a proven track record, having deployed its first satellite, MuSat-1, in 2023. The company's MuSat-2 satellite, supporting Department of Defense weather programs, remains operational after launching in 2024. A third satellite, launched in March 2025, serves as the prototype for the FireSat wildfire-monitoring system, developed in partnership with the Earth Fire Alliance. Three additional FireSats were ordered in May. Dyer commented, “We are very excited about the early data collections and anticipate releasing a public first light soon.”
The company also has several other projects underway, including a thermal-infrared imagery satellite for Hydrosat and three spacecraft for Sierra Nevada Corporation’s commercial radio frequency remote sensing system. Muon Space has secured contracts with the National Reconnaissance Office, Space Force, and Space Development Agency. The funding also supports the recent opening of a 12,000-square-meter production facility in San Jose, California.
The acquisition of Starlight Engines, a developer of solid-propellant Hall-effect thrusters, is a key component of this expansion. This acquisition strengthens Muon Space's vertically integrated Halo satellite platform. Paul Day, Muon’s vice president of spacecraft production, explained, “Propulsion remains one of the most persistent cost and supply chain challenges in satellite manufacturing.” He further added that by integrating Starlight’s technology, “we can accelerate delivery timelines while improving both schedule reliability and overall mission performance.” The first Muon satellite incorporating a Starlight thruster is planned for launch in 2026.
The $89.5 million in funding, comprising $44.5 million in equity and $45 million in credit facilities, was led by Congruent Ventures and included participation from Activate Capital, Acme Capital, Costanoa Ventures, Radical Ventures, and ArcTern Ventures.