Anheuser-Busch Companies, Inc. (NYSE: BUD) operates the largest brewing company in the United States in volume with a 48.8% share of beer sales. Worldwide, Anheuser-Busch's beer sales volume was 121.9 million barrels in 2005. It is the world's fourth largest brewing company based on revenue, after SABMiller, InBev and Heineken International. The company is based in St. Louis, Missouri, United States. "A-B", as the company is often called, operates 12 breweries in the United States and nearly 20 others overseas.