Muon Space Bags $146 Million Series B Funding And Acquires Propulsion Startup Starlight Engines.

Co-founded by Jonny Dyer(CEO), Paul Day(VP of Production), Dan McCleese(Chief Scientist), Reuben Rohrschneider(Chief Mission Architect), And Pascal Stang(CTO), end-to-end intelligence satellite developer Muon Space bags $146 Million in Series B funding led by Congruent Ventures with participation from existing investors – Activate Capital, Acme Capital, Costanoa Ventures, and Radical Ventures and new investor ArcTern Ventures.

This funding is part of its oversubscribed $89.5 million Series B1 round, bringing total Series B funding to $146 million. The new capital includes $44.5 million in equity and $45 million in credit facilities and follows the company’s initial Series B close in August 2024. 

Muon is scaling fast with new funding—expanding satellite production, automation, and ground stations. It has grown 50% since December and signed over $100M in 2024 contracts, including a major deal with SNC.

Founded in 2022 by propulsion veterans Todd Bailey and Mark Hopkins, Starlight has developed a zinc-fueled thruster system that avoids the cost and supply issues of xenon and krypton. Its low-pressure design improves reliability, simplifies integration, reduces size, and supports modular scalability for spacecraft from 100kg to over 500kg.

Muon has opened a 130,000 sq. ft. vertically integrated satellite production facility in San Jose, capable of manufacturing up to 500 satellites annually (100kg–500kg+ class). The site includes 70,000 sq. ft. of manufacturing space, 30,000 sq. ft. of cleanrooms across multiple classifications, secure integration zones, and extensive environmental testing infrastructure—powered largely by a 300 kW solar array and built to UL 2050 security standards.