Chairman and CEO, Exxon Mobil Under Tillerson, Exxon has been the most efficient operator and best capital allocator among supermajor oil companies. It's probably the most shareholder-friendly oil giant as well: Over the past five years, Exxon has paid nearly $40 billion in dividends and repurchased $130 billion in stock, according to Morningstar. Exxon is also emerging as the preferred partner for the national oil companies that control most of the world's reserves. Latest evidence: In September, Exxon and Russian oil company Rosneft announced a joint venture to explore and develop reserves in Russia and the U.S.
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