Amazon

Amazon's retail segment generates $434 billion annually, with its third-party marketplace now accounting for 60%+ of units sold on the platform. This revenue is nearly double that of Costco, the #2 on this list, while its fulfillment network of 1,100+ warehouses outpaces JD.com's logistics reach by delivering to 130+ countries. Founded by Jeff Bezos in 1994 in Seattle, Amazon's private label brands, Amazon Basics, and Whole Foods acquisition (2017, $13.7B) make it a formidable physical retailer alongside its digital dominance.