Up to 100 richest men in Ireland: Forbes list

On October 3, 2026, Forbes tracked 13 male billionaires with Ireland as their country of citizenship. The list below is ordered by estimated net worth in U.S. dollars.

Forbes tracks billionaires, not every wealthy person. Fewer than 100 entries does not mean there are no other wealthy men in Ireland; it means the public list has fewer qualifying names.

Forbes Real-Time Billionaires

Men tracked by Forbes

1. John Collison — US$ 17.5B (Payment software)

2. Patrick Collison — US$ 17.5B (Payment software)

3. John Grayken — US$ 7.5B (Private equity)

4. Shapoor Mistry — US$ 5.0B (Diversified)

5. Eugene Murtagh — US$ 3.4B (Building materials)

6. John Dorrance III — US$ 3.2B (Campbell Soup)

7. Denis O'Brien — US$ 3.1B (Telecom)

8. Firoz Mistry — US$ 2.5B (Diversified)

9. Zahan Mistry — US$ 2.5B (Diversified)

10. Dermot Desmond — US$ 2.2B (Finance)

11. John Armitage — US$ 2.2B (Hedge funds)

12. Jim Thompson & family — US$ 2.2B (Logistics )

13. Philip O'Doherty — US$ 1.9B (Information technology)