E. ON AG marketed with an interpunct as E•ON is the holding company of the world's largest investor-owned energy service provider based in Düsseldorf Germany. The name comes from the Greek word aeon which means eternity. It operates in over 30 countries and serves over 26 million customers. It is one of the 30 members of the DAX stock index of major German companies and a member of the Global Titans 50 index. Its chief executive officer (Vorstandsvorsitzender) is Johannes Teyssen.
