Christian Friege

debitel AG provides mobile & fixed-line telecommunications services, internet and data services. It is a network-independent telecommunications company that offers mobile telephony, fixed-line telephony and the internet. It does all of this by purchasing capacity from various network operators, which it then supplements and combines to create its own products and packages. It works in Germany with the mobile telephony operators like T-Mobile, Vodafone and E-Plus. The company was founded in 1991 and is headquartered in Stuttgart, Germany.

Bertelsmann SE & Co. KGaA engages in the provision of services related to media and education. It operates through the following segments: RTL Group, Penguin Random House, Gruner + Jahr, BMG, Arvato, Bertelsmann Printing Group, Bertelsmann Education Group, and Bertelsmann Investments. The RTL Group segment specializes in radio and television production. The Penguin Random House segment publishes books. The Gruner + Jahr segment focuses on magazines. The BMG segment engages in music production. The Arvato segment offers technology services. The Bertelsmann Printing Group segment unites the printing activities of the Bertelsmann Group. The Bertelsmann Education Group segment encompasses the overall education business. The Bertelsmann Investments segment comprises start-up and fund investments. The company was founded by Carl Bertelsmann in 1835 and is headquartered in Guetersloh, Germany.

Vierol AG is a German company that manufactures automotive car parts and electrical components. The private company is based in Oldenburg, Germany. and has subsidiaries in Germany. The company was founded in 1977 by Jürgen R. Viertelhaus. The CEO is Mirja Viertelhaus-Koschig.

LichtBlick SE engages in in generating nuclear electric power and distributes gas and electricity. The company was founded by Heiko von Tschischwitz and Michael Saalfeld in 1998 and is headquartered in Hamburg, Germany.

Part of Pride Tree Holdings, Inc., Doubleday Direct, Inc. produces and publishes books, magazines, and other media products. The company is based in Gutersloh.