3U Holding AG engages in the telephony, renewable energy and services sectors. It operates through the following segments: Information and Telecommunications Technology (ITC); Sanitary, Heating, and Air Conditioning Technology (SHAC); and Renewable Energies (EE). The ITC segment comprises of voice retail, business voice, and data center centers and operation. The HVAC segment involves the heating, cooling, and ventilation activities. The EE segment engages in project development in the field of wind power and electricity. The company was founded by Udo Graul, Manfred Schwarz, Michael Schmidt, and Roland Thieme on August 26, 1997 and is headquartered in Marburg, Germany.