Headquartered in London and employing more than 70,000 staff, GlaxoSmithKline (now simply "GSK plc" – we'll explain why) is a giant of big pharma. Its greatest hits include the first ever malaria vaccine, Amoxicillin, and 2020's COVID-19 vaccine (ft. Sanofi). The company in is current form is the product of numerous mergers and acquisitions over the years, like a supergroup of drugmakers: Philadelphia's John K Smith & Co. made employee Mahlon Kline a partner and the name became Smith, Kline and Company. A few generations, acquisitions and mergers later, in 2000, SmithKline Beecham plc. (as it was then known) merged with Glaxo Wellcome.
But that's ancient history. Today the stock is listed on the London Stock Exchange (LSE), under the conveniently easy-to-remember ticker "GSK", and traded in sterling. Its hefty market cap makes it a FTSE 100 constituent. Here's how you can get a stake.
The whole process can take as little as 15 minutes. You'll need a smartphone or computer, an internet connection, your passport or driving licence and a means of payment.
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April 29, 2026: GSK reported Q1 2026 results on 29 April, with sales up 5% at constant currency to £7.6b and full-year guidance reaffirmed.
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