Galway native Ruhan (54) made his money after sharing in the success of two firms, Navisite and Global Marine Systems (GMS). He and his brother Andy - who was involved in a protracted divorce case in 2017 that made headlines in the British press - held a 76pc stake in the latter, and cashed in substantially when it was sold in 2014 to HC2.
In 2012, GMS sold a subsidiary for Â£42m (€47m) and had sales of Â£188m (€211m). A keen rugby and motor racing fan, he is currently the CEO of an African payment technology firm, which has had joint venture deals in several countries on that continent. He has also invested in a dentistry business in Britain, and is also believed to have invested in property and tech.