This company is appearing in Tech Track 100 for the third time after founder and chief executive Tony Greaves, 50, upped sales to £33.3m in 2014. Core began life by providing cheap international phone calls and has expanded to become one of the country’s largest distributors of Sim cards. In 2011 it bought ADComms, which provides a wide range of telecoms services to Britain’s railways. In the last year Core has opened four new offices.

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Company details
Year2015
Rank60
CompanyCore Group
ActivityTelecoms services provider
LocationCentral London
Average 3 year sales growth58.19%
Latest sales £000s33,263
Staff165
Founded2005
Websitewww.coretel.co.uk

If applicable:

* supplied by company † annualised figure