Revenue: $90.4 billion

Market Value: $36.8 billion

Founded in November 1991, LukOil is headquartered in Moscow, Russia and employs over 110,000 people from all over the world. It specialises in the exploration, production, refining, marketing, and distribution of oil. The business is divided into four core sections: Exploration and Production; Refining, Marketing and Distribution; Petrochemicals and Power Generation.

The company has over $69 billion in assets and has spent more than $1.4 billion on exploration.

LukOil has also spent over $1.5 billion on environmental security, focussing on utilising its APG (associated petroleum gas), reducing pollution levels in the atmosphere, decreasing contaminated lands and waste water discharge.

Revenue: $42.2 billion

Market Value: $50.6 billion

Reliance Industries is an Indian company founded by Dhirubhai Hirachand Ambani in 1966. The company is headquartered in Mumbai, has over $91.54 billion dollars in assets and employs more than 23,853 people.

It specialises in the exploration and production of oil and gas, petroleum refining and marketing textiles, retail and special economic zones. The company is also involved in the marketing of petrochemicals, polyester, plastics and chemicals.

The company has won a large number of awards such as (most recently) the ‘Sustainable Plus Platinum Award’ awarded in 2016 by the Confederation of Indian Industries.

Reliance Industries is also very popular on social media with over 2.3 million likes on Facebook and 31,200 Twitter followers.

Revenue: $80.8 billion

Market Value: $51.1 billion

Rosneft is a Russian oil and gas operations company, founded in 1993 and headquartered in Moscow. It is not just one of the largest oil and gas companies in Russia, but also one of the largest public oil and gas companies on earth with over $139 billion in assets.  

The company employs over 48,000 people and its largest shareholder is ROSNEFTEGAZ OJSC which owns 69.50 percent of the equity.

Revenue: $102.1 billion

Market Value: $57.1 billion

Gazprom employs more than 449,000 people and has assets worth $250.24 billion. The company, which was founded in 1989, is headquartered in Moscow.

The company is involved with the geological exploration, production, transportation, storage, processing and marketing of gas and other hydrocarbons and it has the world's richest reserves of natural gas.

Gazprom has a gas transmission system which is more than 171,000 kilometres long. This makes it the largest gas transmission system on the globe.

Revenue: $264.9 billion

Market Value: $210 billion

Royal Dutch Shell was founded in February 1907 and is headquartered in The Hague, Netherlands.

The company’s assets are worth over $340 billion and it operates in more than 70 countries. The business's CEO is Ben van Beurden.

The company has employees in excess of 93,000 people on average and it produces the equivalent of three million barrels of oil every day.

Employees that work at Shell work on some of the most innovative energy projects on the globe such as the world’s deepest offshore oil and gas field and the largest floating liquefied natural gas production facility.

The company invested over $1.1 billion in investment in research and development in 2015.

Revenue: $283.6 billion

Market Value: $89.9 billion

Sinopec was founded in December 2000, is headquartered in Beijing, China and currently employs over 78,000 people.

The company manufactures chemicals and petrochemical products. The business runs by working through five sections, these are: Polyester Chips, Bottle-Grade Polyester Chips, Staple Fibre and Hollow Fibre, Filament and Purified Terephthalic Acid.

Revenue: $143.4 billion

Market Value: $121.9 billion

Total was founded in March 1924 and is headquartered in Courbevoie, France. The company’s CEO is Patrick Pouyanné.

Total is known for its exploration, development, production and marketing of oil and gas. As of May 2016, the company has had more than $143.36 billion in sales and it employs over 96,000 people.

The business is split into three sections in which it operates, these are: Upstream, Refining & Chemicals, Marketing & Services.

The company has assets worth over $224.48 billion.

Revenue: $129.9 billion

Market Value: $192.3 billion

Chevron was founded in 1906. It is an energy company which offers administrative, financial, management and tech support to the United States and other international subsidiaries that engage in fully integrated petroleum operations, chemicals operations, mining operations, power generation and energy services.

The company has over $266.1 billion in assets, $129.87 billion in sales and is headquartered in San Ramon, California. The company employs over 61,000 people.

“Our success is driven by our people and their commitment to getting results the right way – by operating responsibly, executing with excellence, applying innovative technologies and capturing new opportunities for profitable growth.”

Revenue: $274.6 billion

Market Value: $203.8 billion

Petro China  is involved in the exploration, development, production and sale of crude oil and natural gas. The business is also involved in the refining of crude oil and petroleum products, production and marketing of primary petrochemical products, derivative chemical products and other chemical products.

The company was founded on the 5th of November, 1999 and is headquartered in Beijing, China. It employs over 851,000 people and has more than $368.69 billion in assets. Petro China’s Chief Executive Officer is Wang Dongjin.

Revenue: $236.8 billion

Market Value: $ 363.3 billion

Exxon Mobil was founded by John D. Rockefeller in 1882 (making it the oldest company on our list) and is headquartered in Irving, Texas.

Exxon Mobil Corp is involved in the exploration, development, and distribution of oil, gas, and petroleum products. It operates through three main sections, these are: Upstream, Downstream, and Chemical. 

The company employs over 75,000 people and (in 2015) had sales of over $236.81 billion and profits of over $16.15 billion. Exxon Mobil currently has assets worth $336.76 billion.

“Over the last 125 years, ExxonMobil has evolved from a regional marketer of kerosene in the United States to the largest publicly traded petroleum and petrochemical enterprise in the world. Today we operate in most of the world's countries and are best known by our familiar brand names: Exxon, Esso and Mobil. We make the products that drive modern transportation, power cities, lubricate industry and provide petrochemical building blocks that lead to thousands of consumer goods.”