Anheuser-Busch, a wholly owned subsidiary of Anheuser-Busch InBev, is the largest brewing company in the United States, with a market share of 49.2% as of 2010.The company operates 12 breweries in the United States and nearly 20 in other countries.ther beers marketed under the Busch brand name are Busch Light, a 4.1% pale lager introduced in 1989, Busch Ice, a 5.9% ice beer introduced in 1995, and Busch NA, a non-alcoholic brew.