Amazon.com is leading the U.S. e-commerce market, with e-commerce net sales of US$125,844 million in 2021 generated in the U.S., followed by walmart.com with US$46,446 million. Third place is taken by apple.com with revenues of US$25,862 million. Target.com is the fourth biggest online store in the U.S. with net sales of US$19,771 million in 2021.

Amazon, Walmart, Target, and eBay are the top retailers among U.S. shoppers. Overall, the top five retailers in the U.S. (both online and in-store) in 2021 are: Amazon – 70% of U.S. consumers shopped here in Q1 2021 Walmart stores – 54% Walmart.com – 38% Target stores – 30% Target.com – 20%