Rolls-Royce Holdings plc develops and delivers mission-critical power systems in the United Kingdom and internationally. The company operates through four segments: Civil Aerospace, Defence, Power Systems, and New Markets. The Civil Aerospace segment develops, manufactures, markets, and sells aero engines for large commercial aircraft, regional jet, and business aviation markets, as well as provides aftermarket services. The Defence segment is involved in the development, manufacture, marketing, and sale of military aero engines, naval engines, and submarine nuclear power plants, as well as offers aftermarket services. The Power Systems segment engages in the development, manufacture, marketing, and sale of integrated solutions for onsite power and propulsion under the mtu brand name. The New Markets segment develops, manufactures, and sells small modular reactor and new electrical power solutions. Rolls-Royce Holdings plc was founded in 1884 and is headquartered in London, the United Kingdom.