https://www.statista.com/statistics/274255/market-share-of-t...
June 2022, 37.8% of all ecommerce market share.
Not sure why you're comparing to physical retail considering the antitrust practices alleged are in the ecommerce space. And even if we were to compare all retail in the US, Amazon is likely to overtake Walmart across all retail come next year. https://www.ascentialedge.com/press/ecommerce-shakes-top-5-r...