This company’s software powers the auctioning of online advertisements. Switch’s customers — publishers such as the AA and the Racing Post — get the best price based on the number of consumers who see their ads. Switch’s trading platform places more than 1bn ads every day, and its technology interprets browsing behaviour to select the right ad to be shown each time a page is opened. The Southampton firm is led by founders Julian and Joanne Spector, 60 and 55, and by Tom Barnett, 35. It had sales of £30.7m this year.
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