Rolls-Royce Holdings plc is a United Kingdom-based holding company. The Company, through its subsidiaries, provides power solutions for customers in civil and defense aerospace, marine, energy and power markets. The Company operates through five business segments: Civil Aerospace, Defence Aerospace, Energy, Marine and Power Systems. The Civil aerospace segment is a manufacturer of aero engines for the airliner and corporate jet markets. The Defence Aerospace segment offers engines for aircrafts in various market sectors, including transport, combat, patrol, trainers, helicopters and unmanned aerial vehicles. The Marine segment is engaged in the provision and integration of systems for offshore oil and gas, merchant and naval vessels. The Energy segment supplies customers with aero-derivative gas turbines, compressors and related services. The Power Systems offers reciprocating engines, propulsion systems and distributed energy systems.