Wall Street Journal | Marathon Oil to Buy PayRock Energy for $888 Million Wall Street Journal The acquisition adds to Marathon's position in an area of Oklahoma known as the Stack, where oil producers are finding they can still make money when crude trades at $45 a barrel. Lee Tillman, Marathon's chief executive, said the 61,000 net surface ... Marathon Oil to buy Oklahoma-based PayRock Energy Marathon Oil Corporation Spikes on STACK Acquisition Marathon Oil Corp. to acquire Oklahoma energy company for $888M |