British multinational pharmaceutical and biotechnology company
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GSK (GlaxoSmithKline) is a large British company that develops and sells medicines and vaccines for treating diseases. It matters because it's one of the world's major pharmaceutical companies that produces drugs and treatments used by millions of people globally.
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GSK plc (an abbreviation of its former name GlaxoSmithKline 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.
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2000 establishments in EnglandBiotechnology companies established in 2000Biotechnology companies of the United KingdomBritish companies established in 2000Chemical companies based in LondonChemical companies established in 2000Companies based in the London Borough of HounslowCompanies in the Dow Jones Global Titans 50Companies in the FTSE 100 IndexCompanies listed on the London Stock ExchangeCoordinates not on Wikidata