The United States commercial and heavy civil construction sector features massive corporate builders that manage multi-billion-dollar megaprojects. Prominent industry leaders heading this group include Bechtel, Fluor Corporation, Turner Construction, Skanska USA, Kiewit Corporation, Jacobs, Hensel Phelps, DPR Construction, Mortenson, Clark Construction Group, Peter Kiewit Sons', Whiting-Turner Contracting, Gilbane Building Company, McCarthy Holdings, M.A. Mortenson Company, Cianbro, Zachry Group, Balfour Beatty US, Austin Commercial, and Holder Construction. These firms construct complex skyscrapers, mass transit systems, energy grids, and industrial manufacturing facilities.