Anheuser-Busch InBev SA/NV (AB InBev) is a Belgian-headquartered multinational drink and brewing company. It is the world's largest brewer by both volume and revenue, operating a portfolio of over 500 beer brands in nearly 50 countries. The company was established through the successive mergers of Interbrew (Belgium), Ambev (Brazil), and Anheuser-Busch (United States).