Xstrata plc was an Anglo-Swiss multinational mining company headquartered in Zug, Switzerland and with its registered office in London, United Kingdom. It was a major producer of coal (and the worlds largest exporter of thermal coal), copper, nickel, primary vanadium and zinc and the worlds largest producer of ferrochrome. It had operations in 19 countries across Africa, Asia, Australasia, Europe, North America and South America. Xstrata had a primary listing on the London Stock Exchange and was a constituent of the FTSE 100 Index. It had a market capitalisation of approximately £29 billion as of 23 December 2011, making it the 16th-largest company on the London Stock Exchange. It had a secondary listing on the SIX Swiss Exchange. On 2 May 2013 ownership of Xstrata was fully acquired by Glencore. Glencore have also announced that they will no longer use the 'Xstrata' brand and it will be phased out. Glencore Xstrata plc is now Glencore plc.