oil

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Premier Oil is a relatively small company devoted entirely to the "upstream" sector of the industry, the exploitation of oil and gas, as opposed to the "downstream'" refining and retail sector. Premier Oil has license interests in eight countries: Albania, Denmark, Germany, Indonesia, Myanmar, Netherlands, Pakistan and the UK.

StatoilHydro is the leading integrated energy company of Norway and the largest off shore oil and gas corporation in the world. It has operations in nearly 40 countries worldwide and was the result of a recent merger between Statoil and the oil and gas division of Norsk Hydro. StatoilHydro has been cited on a number of cases regarding environmental issues and corruption.

Valero Energy Corporation is a Fortune 500 company based in San Antonio, Texas, with 21,836 employees and annual revenue of more than US$90 billion. The company owns and operates 17 refineries throughout the United States, Canada and the Caribbean with a combined throughput capacity of approximately 3.3 million barrels per day, making it the largest refiner in North America.

ExxonMobil (NYSE: XOM) is the largest publicly traded integrated petroleum and natural gas company in the world, and the world's largest company measured by revenues ($404.5 billion in 2007) and market capitalization ($517.92 billion on July 20, 2007).

Total, one of the world's largest oil companies, is headquartered in Paris, France. Its business segments include oil and gas exploration and production, transportation, refining, petroleum product marketing, international crude oil and product trading, and power generation.

Occidental Petroleum Corporation's principal activity is sell crude oil and natural gas. The company's operations are carried out through many subsidiaries and affiliates. Two major subsidiaries are Occidental Chemical Corporation and Occidental Oil and Gas Corporation. The company also owns 76% of OxyVinyls, the primary maker of PVC in North America.