Siegfried Luther

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.

Portigon AG engages in the management of its own assets. It also provides financial services and conducts banking activities. The company was founded in 1969 and is headquartered in Duesseldorf, Germany.

Compagnie Nationale a Portefeuille SA is an investment holding company. The company's asset portfolio can be split into two categories that include the investments through the Pargesa or Groupe Bruxelles Lambert (GBL) and the direct investments. The company was founded on November 20, 1906 and is headquartered in Loverval, Belgium

Wintershall Holding GmbH explores and produces crude oil and natural gas. Its products include crude oil, natural gas and condensate. The firm's technology include exploration, development, production, enhanced oil recovery, and drilling. The company was founded by Carl Julius Winter and Heinrich Grimberg in 1894 and is headquartered in Kassel, Germany.