Rolls-Royce Holdings plc operates as an industrial technology company in the United Kingdom and internationally. The company operates in four segments: Civil Aerospace, Power Systems, Defence, and New Markets. The Civil Aerospace segment develops, manufactures, and sells aero engines for large commercial aircraft, regional jet, and business aviation markets, as well as provides aftermarket services. The Power Systems segment engages in the development, manufacture, marketing, and sale of integrated solutions for onsite power and propulsion for the marine, defense, power generation, and industrial markets. The Defence segment offers aero engines for military transport and patrol aircraft applications; and naval engines and submarine nuclear power plants, as well as aftermarket services. The New Markets segment develops, manufactures, and sells small modular reactor and new electrical power solutions. It also provides maintenance, repair, and overhaul services. Rolls-Royce Holdings plc was founded in 1884 and is headquartered in London, the United Kingdom.