Since appearing in Tech Track 100 in 2009, this London company has grown organically and by acquisition. It has expanded from a provider of cheap international phone calls to become one of the country’s largest Sim card distributors. In 2011 it bought Alan Dick Communications, which provides a wide range of telecom services to Britain’s railways and recently won a deal to install radio coverage in the Mersey railway tunnel. Under founder and chief executive Tony Greaves, 50, sales grew to £20.7m in 2013.

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Company details
Year2014
Rank85
CompanyCore Group
ActivityTelecoms services provider
LocationCentral London
Average 3 year sales growth44.42%
Latest sales £000s20,665
Staff145
Founded2005
Websitewww.coretel.co.uk

If applicable:

* supplied by company † annualised figure