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AstraZeneca plc is a British-Swedish multinational pharmaceutical and biologics company headquartered in London, United Kingdom. It is the world’s fifth-largest pharmaceutical company measured by 2009 prescription drug sales and has operations in over 100 countries. It has a portfolio of products for major disease areas including cancer, cardiovascular, gastrointestinal, infection, neuroscience, respiratory and inflammation. The company was founded in 1999 through the merger of the Sweden-based Astra AB and the UK-based Zeneca Group.
AstraZeneca has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. It had a market capitalisation of approximately £39.5 billion as of 23 December 2011, the tenth-largest of any company with a primary listing on the London Stock Exchange. It has secondary listings on the New York Stock Exchange and the OMX exchange.