Costco Wholesale Corporation is an American multinational corporation which operates a chain of membership-only big-box retail stores. As of 2020, Costco was the third largest retailer in the world, and the world's largest retailer of choice and prime beef, organic foods, rotisserie chicken, and wine as of 2016. In 2021, Costco was ranked #10 on the Fortune 500 rankings of the largest United States corporations by total revenue.