US digital ad revenues at Amazon will more than double this year, eMarketer estimates, moving it up the ranks past Oath and Microsoft to take the No. 3 position behind Facebook and Google. US advertisers will spend $4.61 billion on Amazon’s platform this year, accounting for 4.1% of all digital ad spending in the country. It’s important to note that much of that growth is thanks to an accounting change Amazon made that affected estimates for 2018 and later, leading to the growth spike this year.
Source : Amazon Is Now the No. 3 Digital Ad Platform in the US – eMarketer Trends, Forecasts & Statistics