This University of Southampton spin-out designs and manufactures equipment used by customs and border protection agencies to identify materials that could be used in dirty bombs. Its patented technology can be found in handheld detectors, used by the likes of the US Department of Homeland Security, and in drive-through scanners at ports in Europe, the Middle East and Latin America. It has raised £7m from investors, including innovation charity Nesta. Led by chief executive Heddwyn Davies, 65, the company grew sales to £8.2m last year.

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Company details
Year2017
Rank43
CompanySymetrica
ActivityRadiation detection equipment
LocationSouthampton
Average 3 year sales growth91.72%
Latest sales £000s8,175
Staff50
Founded2002
Websitewww.symetrica.com

If applicable:

* supplied by company † annualised figure