More than a century after American magnate John D. Rockefeller built a petroleum empire through Standard Oil — at its peak, the company controlled roughly 91% of U.S. oil production — its legacy still looms large in today's market.
Some of the biggest players in the energy sector today can trace their corporate roots directly to the 34 operating companies created by Standard Oil's historic breakup. The list features Exxon Mobil (XOM), Chevron (CVX), BP (BP) and Marathon Petroleum (MPC), among others.
