Adams Resources & Energy and its subsidiaries are primarily engaged in the business of crude oil marketing, transportation and storage in various crude oil and natural gas basins in the lower states of the United States. The company's business segments are: Crude Oil Marketing, which are engaged in the sale and delivery of crude oil purchased either directly from producers or from others on the open market; and Transportation, which consists of the operations of its wholly owned subsidiary, Service Transport Company, to transports liquid chemicals and, to a lesser extent, dry bulk on a for hire basis throughout the continental United States, and into Canada and Mexico.

Apache is an independent energy company that explores for, develops, and produces natural gas, crude oil, and natural gas liquids. The company had exploration and production operations in United States, Egypt, and offshore United Kingdom in the North Sea. The company also has exploration interests in Suriname. The company markets its United States crude oil production to main oil companies, marketing, and transportation companies, and refiners based on a West Texas Intermediate price or other regional pricing indices. The company has two international regions: The Egypt includes onshore conventional assets in Egypt's Western Desert. The North Sea region includes offshore assets based in United Kingdom.

BP is an integrated oil and gas group based in the United Kingdom. Co. is engaged in the exploration and production of crude oil and natural gas; refining, marketing, supply and transportation; and the manufacture and marketing of petrochemicals. Co. operates globally, with business activities in Europe, the U.S., Canada, Russia, South America, Australasia, Asia and parts of Africa. Co. operates in two business segments: Exploration and Production - including oil and natural gas exploration and development and production; and Refining and Marketing- activities include the refining, manufacturing, supply and trading, marketing and transportation of crude oil, petroleum and petrochemicals.

Cabot Oil & Gas is an independent oil and gas company engaged in the development, exploitation, exploration and production of oil and gas properties. The company operates in one segment, natural gas and oil development, exploitation, exploration and production, in the continental United States. The company's operations are primarily concentrated in one unconventional play—the Marcellus Shale in northeast Pennsylvania.

Chesapeake Energy is a holding company. Through its subsidiaries, the company is an independent exploration and production company engaged in the acquisition, exploration and development of properties to produce oil, natural gas and natural gas liquid from underground reservoirs. The company owns a portfolio of onshore U.S. liquids and natural gas assets. The company has positions in the resource plays of the Eagle Ford Shale in South Texas, the stacked pay in the Powder River Basin in Wyoming and the Anadarko Basin in northwestern Oklahoma. The company's natural gas resource plays are the Marcellus Shale in the northern Appalachian Basin in Pennsylvania and the Haynesville/Bossier Shales in northwestern Louisiana.

Chevron is engaged in energy and chemicals operations. Upstream operations consist primarily of, among others, exploring for, developing and producing crude oil and natural gas; processing, liquefaction, transportation and regasification associated with liquefied natural gas, storage and marketing of natural gas; and a gas-to-liquids plant. Downstream operations consist primarily of, among others, refining crude oil into petroleum products; marketing of crude oil and refined products; and manufacturing and marketing of commodity petrochemicals, plastics for industrial uses and fuel and lubricant additives.

ConocoPhillips is an exploration and production company engaged in exploring for, producing, transporting and marketing crude oil, bitumen, natural gas, liquefied natural gas and natural gas liquids. The company's segments include: Alaska, which operates in Alaska; Lower 48, which operates in the United States and the Gulf of Mexico; Canada, which operates in Alberta and British Columbia; Europe and North Africa, which consists of operations and exploration activities in Norway, the United Kingdom and Libya; Asia Pacific and Middle East, which operates in China, Indonesia, Malaysia, Australia, Qatar, and Timor-Leste; and Other International, which operates in Colombia, Chile and Argentina.