Rolls-Royce Holdings plc operates as an industrial technology company worldwide. It operates through four segments: Civil Aerospace, Power Systems, Defence, and ITP Aero. The Civil Aerospace segment manufactures aero engines for large commercial aircraft, regional jet, and business aviation markets, as well as provides aftermarket services. The Power Systems segment provides high-speed and medium-speed reciprocating engines, and propulsion systems for marine, defense, power generation, and industrial markets. It also engages in civil nuclear operations that supply safety-critical systems to nuclear power plants. The Defence segment offers aero engines for military transport and patrol aircraft applications; and naval engines and submarines, as well as aftermarket services. The ITP Aero segment is involved in the design, research and development, manufacture and casting, and assembly and testing of aeronautical engines and gas turbines. It also provides maintenance, repair, and overhaul services for regional airlines and helicopters, as well as business aviation, and industrial and defense applications. Rolls-Royce Holdings plc was founded in 1884 and is headquartered in London, the United Kingdom.