https://kvoa.com/news/top-stories/2021/08/18/amazon-surpasses-walmart-as-largest-retailer-thanks-to-pandemic-sales/
TL;DR When you hear "largest retailer," don't think of the house that Sam Walton built anymore.
Amazon has surpassed Walmart for that title.
It's something analysts expected for some time, but an increased reliance on e-commerce during the pandemic accelerated the rise of Jeff Bezos' baby.
According to wall street estimates compiled by the financial research Firm Factset, Amazon took in more than $610 billion over the past 12 months while Walmart took in $566 billion.