This software firm’s Affinity Photo iPad image editing program was recognised by Apple as its worldwide app of the year in 2017. Under the Affinity brand, Serif has developed a suite of cross-platform graphic design products for professionals, and has moved away from hardware and gadget sales to a download-only model, which has helped it to expand overseas, with key markets that include America, Germany and Britain. Managing director Ashley Hewson, 41, oversaw profits of £5.2m in 2017. Its operating margin of 40% is one of the highest on the league table.
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