Walmart Inc. is an American multinational retail corporation that operates a chain of hypermarkets, discount department stores, and grocery stores.

The Home Depot, Inc. is the largest home improvement retailer in the United States, supplying tools, construction products, and services.

Tesco plc is a British multinational groceries and general merchandise retailer with headquarters in Welwyn Garden City, England.

J Sainsbury plc, trading as Sainsbury's, is the second largest chain of supermarkets in the United Kingdom.

Aldi is a German family-owned discount supermarket chain with over 10,000 stores in 20 countries.

Lidl is a German discount supermarket chain with a strong presence in Poland.

Carrefour S.A. is a French multinational retail corporation headquartered in Massy, France.

Asda Stores Ltd. is a British supermarket chain. It is the second largest chain in the United Kingdom.

Wm Morrison Supermarkets plc, trading as Morrisons, is the fourth largest chain of supermarkets in the United Kingdom.

Waitrose & Partners is a brand of British supermarkets, which forms the food retail division of Britain's largest employee-owned retailer.

Costco Wholesale Corporation is an American multinational corporation which operates a chain of membership-only warehouse clubs.

Mercadona is a Spanish supermarket chain and the largest Spanish company by turnover.