South African Breweries (officially The South African Breweries Limited, informally SAB) is a brewing and bottling company headquartered in Johannesburg, South Africa and a wholly owned subsidiary of SABMiller. It is the dominant brewing company in South Africa, with a market share of around 89 per cent.The company was founded in 1895 as Castle Breweries to serve a growing market of miners and prospectors in and around Johannesburg.