Now an investor and advisor to HPSU companies, Limerick native Hugh O'Donnell became a global player with Clonmel-based engineering firm Kentz in the oil-services sector. He floated the company on the stock markets in 2007 moving on four years later. The Limerick-based engineer sold 15m shares at the IPO, and when the company was sold to Canadian engineering and construction company SNC-Lavalin in 2014, he netted about 51m more. O'Donnell's Mac X3 investment firm is “committed to sustainable development of high-potential start-up companies and to the people who make it happen”.