The data shows the leading 20 public oil companies worldwide based on daily oil production as of 2015. At that time, Russia's Gazprom was the world's biggest public oil company based on daily oil production.
Leading oil companies
The oil and gas industry is one of the biggest industries worldwide. This sector is involved in exploration, extraction, refining, transport and marketing of these commodities. Many industries are extremely dependent on oil and gas products, mostly in the form of energy fuels or raw materials for chemical products.
