Rolls-Royce Group plc (LSE: RR.) is a British multinational power systems company headquartered in the City of Westminster, London, United Kingdom. It is the world’s second-largest maker of aircraft engines (behind General Electric), and also has major businesses in the marine propulsion and energy sectors. Through its defence-related activities it is the world's 18th-largest defence contractor measured by 2010 defence revenues. It had an announced order book of £58.3 billion at 31 December 2009.
Rolls-Royce is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index. As of December 2011, it had a market capitalisation of £13.58 billion, the 28th-largest of any company with a primary listing on the London Stock Exchange. – less