C3S LLC

C3S LLC (Complex CubeSat Components and Systems) was established in Budapest, Hungary in 2012, emerging from the Masat-1 student satellite mission — the first Hungarian satellite. Since then, C3S has grown into a trusted supplier and integrator of small satellite platforms and subsystems, serving both NewSpace constellations and the traditional large satellite sector with a 100% mission success rate.

C3S's product portfolio includes on-board computers, electrical power systems, DC-DC converters, UHF/VHF communication modules, and complete 3U–12U CubeSat platforms. The company provides end-to-end mission services from concept and platform design through manufacturing, integration and testing, launch management, and satellite operations. In-house environmental qualification facilities — including thermal-vacuum chambers and vibration testing — support full satellite qualification without reliance on external facilities.

The company has delivered satellites for scientific, commercial, and governmental customers across Europe, developing a reputation as one of Europe's leading CubeSat integrators. Notable missions include the WISDOM satellites for 5G NTN validation, the Mauve astrophysics CubeSat for monitoring stellar flares, and the RAVEN constellation project for resilient access validation. C3S also operates its own UHF/VHF ground station and Mission Operations Center (MOC) for satellite tracking and command.

Headquartered at Budapest, Hungary, C3S is a member of the Hungarian Space Cluster and holds ISO 9001:2015 certification.