Marathon Oil Corporation, through its subsidiaries, engages in the exploration, refining, and transportation of crude oil and petroleum products worldwide. It operates in three segments: Exploration and Production; Refining, Marketing, and Transportation; and Integrated Gas. The Exploration and Production segment involves in the exploration, production, and marketing of crude oil and natural gas worldwide. p/e 8.96

BUSINESS SUMMARY Petroleo Brasileiro S.A.�Petrobras, together with its subsidiaries, engages in the exploration, exploitation, and production of oil from reservoir wells, shale, and other rocks in Brazil. It supplies oil, liquefied natural gas, and natural gas to refineries in Brazil; and sells surplus production in Brazil and foreign markets. p/e 13.63

Norsk Hydro ASA develops, produces, and supplies oil, gas, and hydropower worldwide. It develops renewable energy sources, as well as supplies various aluminum products. The company engages in the exploration, field development, and production of oil and gas. It also engages in the energy and oil marketing, consisting of commercial operations within oil, natural gas, and power; operation of hydroelectric power stations; management of interest in the gas transportation system on the Norwegian Continental Shelf; and marketing and sale of refined petroleum products, such as gasoline, diesel, and heating oil. p/e 16.91

Northrop Grumman Corporation provides products, services, and solutions in information and services, aerospace, electronics, and shipbuilding to the military, government, and commercial customers in the United States and internationally. Information and Services business provides various command, control, communications, computers, and intelligence support to the various branches of the U.S. Department of Defense (DoD) and the Intelligence Community; supports the U.S. integrated Missile Defense system and the Intercontinental Ballistic Missile Program; offers p/e 17.23

Basic Energy Services, Inc. provides well site services to oil and gas drilling and producing companies in the United States. It operates in four segments: Well Servicing, Fluid Services, Drilling and Completion Services, and Well Site Construction Services. The Well Servicing segment provides maintenance services involving removal, repair, and replacement of down-hole equipment and returning the well to production; workover; new well completion; and plugging and abandonment services. As of December 31, 2006, this segment operated a fleet of 365 well service rigs and 90 facilities in Texas, Wyoming, Oklahoma, North Dakota, New Mexico, Louisiana, Colorado, and Montana p/e 9.35