In 2019, about 22 percent of all digital advertising spending was in retail. Automotive, financial service and telecom companies were also among the top spenders that year.

Largest radio advertising industries

The leading industry, in terms of radio ad spending in the United States, was the retail industry. Companies within this sector spent roughly 500 million U.S. dollars on radio ads in 2018. Other high-spending verticals on the list included media & advertising, and business & technology.

Leading advertisers by ad spend

In 2018, the companies investing the most in advertising in the United States were Comcast Corporation, AT&T, and Amazon. Comcast invested over six billion U.S. dollars in promotional activities that year. In terms of internet display advertising specifically, Amazon led the list, spending roughly 430 million U.S. dollars, which was more than twice the amount Comcast spent on those types of ads in the same period. Comcast was also 2018’s second-largest radio advertiser, spending just about 12 million U.S. dollars less than the front-runner T-Mobile US.