The Terenure-based Turley brothers Greg (54), Mark (49) and Niall (47) built up the Argus car hire business before realising that there was a huge gap in the market to provide the technology for the entire industry. They exited their Cartrawler business for €110m in 2011 but held on to a 25pc stake. When the company was sold by its private equity owners for €400m, two years ago, there was another bumper cheque. There was debt to be cleared.
They have invested in building Europe's largest bioethanol plant in Hungary, buying out their partners for an undisclosed sum last year. There is also a stake in Kevin Godley's WholeWorldBand music app and shares of other start-ups, plus a stack of property in Dublin 6.