GlaxoSmithKline is a large global pharmaceutical company formed in 2000 through the merger of Glaxo Wellcome and SmithKline Beecham. It is headquartered in London, England and has operations in over 100 countries. In 2009, GlaxoSmithKline had annual revenue of £28.4 billion and employed around 99,000 people worldwide. Key events in the company's history included the 1995 merger of Glaxo and Wellcome, the 1982 merger of SmithKline and Beckman Instruments to form SmithKline Beecham, and the 2000 merger that created GlaxoSmithKline.