Cookstown firm Lissan Coal Company has been named as one of Northern Ireland’s top five performing businesses in the Sunday Times Grant Thornton Top Track 250 league table.
The company also runs the Go forecourt retail brand with more than 35 petrol stations, and LCC Power, an electricity supplier.
According to the Times, its sales dropped 8% in 2014 to £531m, but operating profits increased 46% to £18m, the highest profit growth in Northern Ireland.
Earlier this year, LCC revealed it had clinched the contract to power 10 of the 11 new super councils.
It also powers the Stormont Estate, all of Northern Ireland’s street lights, museums and the BBC.
And in the last year has gone from employing a team of seven at its Cookstown headquarters, to an astonishing 55 staff with the opening of a new office in Belfast.
Now one of Northern Ireland’s top electricity suppliers, the firm has a third of the market share.