Exxon Mobil Corporation (Exxon Mobil) is a manufacturer and marketer of commodity petrochemicals, including olefins, aromatics, polyethylene and polypropylene plastics and a range of specialty products. The Company has a number of divisions and affiliates with names that include ExxonMobil, Exxon, Esso or Mobil. Divisions and affiliated companies of ExxonMobil operate or market products in the United States and other countries of the world. Their principal business is energy, involving exploration for, and production of, crude oil and natural gas, manufacture of petroleum products and transportation and sale of crude oil, natural gas and petroleum products. In January 2012, Apache Corporation acquired Exxon Mobil's Mobil North Sea Limited assets including the Beryl field and related properties. In April 2013, BNK Petroleum (US) Inc. sold Tishomingo Field, Oklahoma assets other than the Caney and upper Sycamore formations to XTO Energy Inc., a subsidiary of Exxon Mobil Corporation.