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GSK plc American Depositary Shares (Each representing two Ordin
GSK plc is a British multinational pharmaceutical and biotechnology company. It was established in 2000 by a merger of Glaxo Wellcome and SmithKline Beecham, which was itself a merger of a number of pharmaceutical companies around the Smith, Kline & French firm. It is headquartered in London, England.
GSK is the tenth-largest pharmaceutical company in the world by earnings, $9.32 billion in 2025 with $42.4 billion in revenues in the same period. As of February 2026 it is the 175th most valuable company in the world and the 12th most valuable pharmaceutical company with a market capitalisation of $122.6 billion. It was also ranked 388th on the 2025 Fortune Global 500.
The company has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index, the eighth largest on the London Stock Exchange behind British pharmaceutical rival AstraZeneca, which occupies the No 1 spot in London at a value of $325 billion, 2.7x more than GSK.
The company developed the first malaria vaccine, RTS, S, which it said in 2014, it would make available for five per cent above cost.