Gemma Maughan (75) owns 46pc of Gowan Group, one of the country's largest car sellers and appliance distributors. It was set up by her late husband Con Smith in 1969. Daughters Alba, Christiana, Mary Louise and Fiona each own 13pc.
Turnover at Gowan, which distributes Peugeot and Honda cars, was up 29pc to €134m in 2014 and the group returned to profitability after six years in the black. Shareholders' funds rose to €62.6m. Gowan is forecasting a massive 30pc hike in the market.
Gowan also owns Senator Windows, and distributes high-end kitchen brands, including De Dietrich, Neff and Bauknecht. Long-time Shrewsbury Road residents, recent company filings give a new Ailesbury Road address for Gemma and husband Michael.