Diageo is the world's biggest whisky producer with 28 malt distilleries and two grain distilleries. The company operates the Scotch whisky distilleries of Auchroisk, Benrinnes, Blair Athol (situated at Pitlochry), Caol Ila, Cardhu, Knockando, Glen Elgin, Clynelish, Cragganmore, Dalwhinnie, Glenkinchie, Glen Ord, Lagavulin, Linkwood, Oban, Royal Lochnagar, Strathmill, Talisker, Teaninich, Mannochmore, Mortlach and Glenlossie, which are sold not only under their own name but used to make the various blended Scotch whiskies sold by the company, and owns the stock of many closed distilleries such as Port Ellen, Rosebank, Brora, Convalmore, Glen Albyn, North Brechin, Banff, and Linlithgow. The company has opened a new malt distillery adjacent to their maltings at Roseisle (1st new make spirit produced Spring 2009). This will be one of the largest malt distilleries in Scotland. The new building contains 14 traditional copper pot stills. An expansion programme is also underway at its Cameron Bridge Grain Distillery in Fife that will make it the largest grain distillery in Scotland.
http://en.wikipedia.org/wiki/Diageo