Testplant started life in 2008 when founder and chief executive George Mackintosh, 58, bought a small Colorado software testing tool developer with £1m in funding from Seraphim Capital. Its eggPlant range of software tools helps companies try out applications across different platforms, and has been used by Bloomberg to test its terminals and by Wal-Mart to ensure its point-of-sale systems are robust. In January the US investor Carlyle Group bought Seraphim’s majority stake for an undisclosed sum. Sales in 2015 hit £9.1m.
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