Dayton, Ohio -- Walmart holds on to the top spot in the annual ranking of the 50 most valuable U.S. retail brands from branding consultancy firm Interbrand. The discounter’s brand value is put at $141 billion (up 1% from the 2012 report.). By comparison, the second-highest ranked U.S. brand, Target Corp., has a value of $25 billion. The Home Depot is solid at number three, with a brand value of nearly $23 billion.