The 2016 Inc. 5000 are the superheroes of the U.S. economy. America’s fastest-growing private companies wield powers like strategy, service, and innovation. On this list you’ll find businesses that exercise the body and the mind, push the boundaries of virtual reality and 3-D printing, and delight fans with rock concerts and (in the case of the No. 1 company, LootCrate) superheroes.