This Southampton University spin-out designs and makes handheld detectors that can identify materials used in dirty bombs. It sells to customs and border agencies, including the US Department of Homeland Security, and its patented technology is used in drive-through scanners at ports across the world. Under chief executive Heddwyn Davies, 65, exports rose to £9.8m in 2017, with 92% destined for the US.

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Company details
Year2018
Rank15
CompanySymetrica
ActivityDetection equipment manufacturer
LocationSouthampton
2 yr av intl sales growth % pa132.83%
International sales £000s9,758
Total sales £000s10,838
Staff59
Founded2002
Websitewww.symetrica.com

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* Supplied by company † Annualised figure