Via various trusts, Declan (52) and Shane (44) Ryan inherited their father Tony Ryan's stake in Ryanair. Most of those €260m worth of shares have been sold since the IPO in 1997.
Wicklow-based Declan has become one of the most successful low-cost airline creators on the planet, spreading his version of the Ryanair gospel to the US, Asia and Latin America. He backed Singapore-based Tiger Airways, which generated a 28-fold return on Ryan's initial punt when floating in 2010.
A stake in Allegiant Air in the US grew six-fold in two years - making $40m from a $7m investment. However, jittery stockmarkets caused the postponement of a €165m stockmarket listing of the Ryan-backed VivaAerobus in Mexico. Declan is also a shrewd investor in biotech and other start-ups, ranging from Coindrum to Growcorp.
Last year he sold out of the €40m apartment rental group Staycity and also pocketed almost €1m from the sale of London Irish rugby club. There are also valuable property interests in Poland, Mexico and Asia. Shane is a successful bloodstock farmer in