Rolls-Royce Holdings plc is a British multinational public holding company that, through its various subsidiaries, designs, manufactures and distributes power systems for aviation and other industries. Rolls-Royce Holdings is headquartered in City of Westminster, London. It is the world’s second-largest maker of aircraft engines, and also has major businesses in the marine propulsion and energy sectors. Rolls-Royce was the world's 16th-largest defence contractor in 2011 and 2012 when measured by defence revenues. It had an announced order book of £71.6 billion as of January 2014.
Rolls-Royce is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index. As of June 2013, it had a market capitalisation of £22.22 billion, the 24th-largest of any company with a primary listing on the London Stock Exchange.