Amazon surpasses 10% of U.S. digital ad market share By: MarketWatch April 06, 2021 at 06:41 AM EDT Amazon.com Inc.’s share of the U.S. digital ad market grew to 10.3% last year from 7.8% in 2019, according to a new report from research firm eMarketer. Read More >> Related Stocks: Alphabet-A Amazon.com Facebook