ENSEK develops software for energy industry clients, including big six suppliers such as British Gas and new entrant Ovo. Founded in 2010, the firm has built a software platform that allows suppliers to interact with the market, manage billing and payment, and report their revenues and margins. Last year co-founder and chief executive Jon Slade, 39, led a management buyout backed by LDC for £15m, with the private equity house taking a minority stake. As part of the deal, former managing director of British Gas, Ian Peters, 59, joined the Nottingham firm as chairman, helping oversee sales of £6.2m in the year to March 2018.

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Company details
Year2018
Rank46
CompanyENSEK
ActivityEnergy software developer
LocationNottingham
Average 3 year sales growth87.56%
Latest sales £000s*6,161
Staff110
Founded2010
Websitewww.ensek.co.uk

If applicable:

* supplied by company † annualised figure