A CEO stands for Chief Operating Officer. A company can control a number of other companies. For example Ford Motor Company controls Opel. Ford has a CEO. Opel has a CEO. You can have any number of CEOs, one over each subdivision. In the United States you have one chairman of the Board and one President. For a while, Shell Oil Company had two different boards of directors. One in England and one in the Netherlands. That created a mess. Finally they merged.