Market Concentration: concentration of largest firms by industry in the U.S. 2017

The three most concentrated industries in the U.S. as of 2017, in terms of the market share controlled by the top four firms in the industry, were information services, transportation and warehousing, and the utilities sector. Despite fears of growing market concentration in the U.S., none of these industries have a market share for their top four firms of greater than 30 percent. Industries which benefit from economies of scale and network effects tend to be the most concentrated in terms of market share, while industries which are more localized such as construction or accommodation and food services come towards the bottom of the list.