3U Holding AG, together with its subsidiaries, provides telecommunication and information technology services in Germany and internationally. The company operates in three segments: Information and Telecommunications Technology (ITC); Renewable Energies; and Sanitary, Heating and Air Conditioning Technology (SHAC). It provides voice retail and business, and data center and managed services; and trades in IT licensing; plans and installs fibre optic technology within buildings; voice telephony services; and dial-around services. The company also develops wind power projects; and generates electricity with its own power plants using wind and solar energy. In addition, it sells and distributes sanitary, heating, and air conditioning systems to wholesalers, tradespeople, and DIYers through its online stores. 3U Holding AG was founded in 1997 and is headquartered in Marburg, Germany.