Muon Space, a leading provider of end-to-end space systems specializing in mission-optimized satellite constellations, today announced the close 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.

The B1 round was led by Congruent Ventures and included existing investors - Activate Capital, Acme Capital, Costanoa Ventures, and Radical Ventures. Muon also welcomed new investor ArcTern Ventures to the syndicate.

Founded in 2021, Muon Space is an end-to-end space systems company that designs, builds, and operates mission-optimized satellite constellations to deliver critical data and enable real-time compute and decision-making in space. Its proprietary technology stack, Halo™, integrates advanced spacecraft platforms, robust payload integration and management, and a powerful software-defined orchestration layer to enable high-performance capabilities at unprecedented speed - from concept to orbit. With state-of-the-art production facilities in Silicon Valley and a growing track record of national security and commercial customers, Muon Space is redefining how critical Earth intelligence is delivered from space.