Supplying its precision watches to various clients, including the Admiralty, the business quickly grew and expanded into a major provider of timepieces, diamonds and automotive instrumentation. Smiths Group has its origins in a jewellery shop, S Smith & Sons, which was founded by the watchmaker and businessman Samuel Smith. Smiths Group is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index. It has operations in over 50 countries and employs around 23,550 staff. Smiths Group plc ( LSE: SMIN) is a British multinational diversified engineering business headquartered in London, England.