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Declan and Shane Ryan

Declan (51) and Shane (43) Ryan’s late father Tony Ryan was one of the greatest entrepreneurs the country has ever produced, setting up GPA and Ryanair. Declan is following in his footsteps with some gusto.

He was one of the co-founders of Ryanair and was actively involved in the airline until he sold most of his €260m stake in 2004. He set about replicating Ryanair’s hugely successful low cost business model in a number of other start-up airlines around the world. Singapore-based Tiger Airways generated a 28-fold return on Ryan’s initial investment when it floated in 2010. That was boosted by a stake in Allegiant Air in the US, which grew six-fold in two years — yielding $40m from a $7m investment.

Ryan has now set his sights on Central and South America, having signed a €90m airline joint venture with Mexican transport group Iaamsa.

This airline Viva Aerobus, in which Ryan has a 46pc stake, pulled a €165m IPO, but may return to stock markets this year. He is also developing an airline in Colombia.

In Ireland, Ryan is a serial biotech and technology investor through the Growcorp and Frontline ventures.

There are sizeable property interests in Enniskerry, Dublin, Brussels, Poland, Mexico and Hong Kong. He spent €2.5m to buy a six bed house near Harcourt Street in Dublin, and €850,000 for a modern house in Enniskerry.

Ryan’s One Foundation is one of the biggest philanthropic organisations in the country and has given away at least €30m.

Brother Shane is a highly successful stud farm owner in Kentucky and Tipperary.

24 Mark Getty €655m

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