As far as revenue is concerned, the biggest global retail company is Walmart, with almost $520 billion in global earnings. Amazon is in second place, with $280.5 billion in revenue, according to both global and US retail sales statistics. Costco, Schwarz Group, and Aldi hold places three to five, with revenues ranging from $116 billion to $163 billion. Schwarz Group and Aldi are both German Discount Grocery chains, and the other three are US-based companies. This trend continues even when we look at the expanded list.