From the ground up, Fluor is one of the world's largest international design, engineering, and contracting firms. Through subsidiaries, it provides engineering, procurement, construction, and maintenance (EPCM), as well as project management services for a variety of industrial sectors around the world. Its construction portfolio includes manufacturing plants, refineries, pharmaceutical facilities, health care buildings, power plants, and telecommunications and transportation infrastructure. Oil and gas sector projects account for more than 50% of its revenue. The group also provides operations and maintenance services for its projects, as well as administrative and support services to the US government.