Mohammed Al-Amoudi, $13.5 billion
Saudi Arabian. Oil Refineries, Mining
Mohammed Al-Amoudi, the son of a Saudi father and Ethiopian mother, made his initial fortune by cornering lucrative construction contracts in Saudi Arabia. He now sits atop Midroc Group, a sprawling conglomerate that owns oil refineries in Morocco and Sweden and oil fields off West Africa. In Ethiopia, his holdings include a 70% stake in the National Oil Company as well as hotels and gold mines.