While Costco still holds the top spot, its score remains unchanged as its two biggest competitors each improved by three points in an annual survey.

Walmart Inc. (NYSE: WMT) scored poorly in a recent customer satisfaction study. Low scores have not kept it from being the largest retailer in America. Follow 24/7 Wall St. on Google This post may ...

When it comes to sheer size, Wal-Mart is the undisputed leader, operating more than 11,500 stores under 72 banners in 28 countries. In the U.S., it has about 5,200 stores (including Sam's Club stores) ...