3U Holding AG

3U Holding AG is a diversified German investment holding company that acquires, operates, and sells businesses across key megatrends including information and telecommunications technology (ICT), renewable energies (RE), and heating, ventilation, and air conditioning (HVAC). Founded in 1997 and publicly listed since 1999, it provides comprehensive support in personnel, legal, financial, and strategic areas to its subsidiaries, enabling them to focus on core operations. In the ICT segment, 3U Holding AG offers VoIP services, fiber-optic installations, data centers, managed services, cloud solutions, and software licensing for document security. The renewable energies division develops wind power projects, operates wind farms and solar parks generating 55 gigawatt hours annually, and holds Bitcoin assets to bridge traditional and digital value preservation. Through its online platform Selfio, the HVAC segment supplies sanitary, heating, ventilation, water management systems, and air conditioning products to wholesalers, tradespeople, and DIY customers. Headquartered in Marburg with 12 locations and around 234 employees, 3U Holding AG generated €56 million in sales in 2024, primarily in Germany, underscoring its role in driving digitalization, sustainability, and e-commerce innovation.