Profrac Holding Corp.
A vertically integrated energy-services company that helps oil and gas producers extract fuel from tight rock, offering hydraulic fracturing (frac) services, frac sand, and the high-horsepower pumps it builds itself. Founded in 2016 by the Wilks family, Texas oilfield veterans who earlier built and sold another frac giant, Frac Tech. Its name is short for "professional fracturing," and today it's run by the founders' sons and nephews.