An Anglo–Dutch multinational oil and gas company headquartered in The Hague, Netherlands and with its registered office in London, United Kingdom. It is the world's second largest company by 2011 revenues and one of the six oil and gas "supermajors". Shell is also one of the world's most valuable companies. As of September 2012, its largest shareholder is BlackRock with 5% stake, while the Qatar Investment Authority has announced a plan to raise its stake from below 3% to 7%.

Shell is vertically integrated and is active in every area of the oil and gas industry, including exploration and production, refining, distribution and marketing, petrochemicals, power generation and trading. It also has major renewable energy activities, including in biofuels, hydrogen, solar and wind power. It has operations in over 90 countries, produces around 3.1 million barrels of oil equivalent per day and has 44,000 service stations worldwide. Shell Oil Company, its subsidiary in the United States, is one of its largest businesses.

Shell has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. As of 6 July 2012, it was the largest company on the FTSE, with a market capitalisation of £140.9 billion. It has secondary listings on Euronext Amsterdam and the New York Stock Exchange.

In November 2004, following a period of turmoil caused by the revelation that Shell had been overstating its oil reserves, it was announced that the Shell Group would move to a single capital structure, creating a new parent company to be named Royal Dutch Shell plc, with its primary listing on the London Stock Exchange, a secondary listing on the Amsterdam Stock Exchange, its headquarters and tax residency in The Hague, Netherlands and its registered office in London. The unification was completed on 20 July 2005 and the original owners delisted their companies from the respective exchanges. On 20 July 2005, the Shell Transport & Trading Company plc was delisted from the LSE, where as, Royal Dutch Petroleum Company from NYSE on 18 November 2005. The shares of the company were issued at a 60/40 advantage for the shareholders of Royal Dutch in line with the original ownership of the Shell Group.

During the 2009 Iraqi oil services contracts tender, a consortium led by Shell (45%) and which included Petronas (30%) was awarded a production contract for the "Majnoon field" in the south of Iraq, which contains an estimated 12.6 billion barrels (2.00×109 m3) of oil. The "West Qurna 1 field" production contract was awarded to a consortium led by ExxonMobil (60%) and included Shell (15%).

In February 2010 Shell and Cosan formed a 50:50 joint-venture, Raízen, comprising all of Cosan's Brazilian ethanol, energy generation, fuel distribution and sugar activities, and all of Shell's Brazilian retail fuel and aviation distribution businesses. In March 2010, Shell announced the sale of some of its assets, including its liquid petroleum gas (LPG) business, to meet the cost of a planned $28bn capital spending programme. Shell invited buyers to submit indicative bids, due by 22 March, with a plan to raise $2–3bn from the sale. In June 2010, Royal Dutch Shell agreed to acquire all of the business of East Resources for a cash consideration of $4.7 billion. The transaction included East Resources' tight gas fields.