Royal Dutch Shell is a large multinational oil and gas company formed in 1907 through the merger of Royal Dutch Petroleum and Shell Transport and Trading. It operates in over 90 countries and produces around 3.1 million barrels of oil equivalent per day. The company has a diverse portfolio across the oil and gas value chain including exploration, production, refining, distribution, marketing, petrochemicals, and power. Royal Dutch Shell is one of the six oil supermajors and was the largest company in the world by revenue in 2013. The company is dual-listed on the London and Amsterdam stock exchanges.