Rank  Name  Age  Worth ($bil)  Country Of Citizenship  Residence 
1 William Gates III  49 46.5 United States United States , WA , Medina 
2 Warren Buffett  74 44.0 United States United States , NE , Omaha 
3 Lakshmi Mittal  54 25.0 India United Kingdom , London 
4 Carlos Slim Helu  65 23.8 Mexico Mexico , Mexico City 
5 Prince Alwaleed Bin Talal Alsaud  48 23.7 Saudi Arabia Saudi Arabia , Riyadh 
6 Ingvar Kamprad  78 23.0 Sweden Switzerland , Lausanne 
7 Paul Allen  52 21.0 United States United States , WA , Seattle 
8 Karl Albrecht  85 18.5 Germany Germany , Mülheim an der Ruhr 
9 Lawrence Ellison  60 18.4 United States United States , CA , Silicon Valley 
10 S Robson Walton  61 18.3 United States United States , AR , Bentonville 
11 Jim Walton  57 18.2 United States United States , AR , Bentonville 
11 John Walton  59 18.2 United States United States , AR , Bentonville 
13 Alice Walton  56 18.0 United States United States , TX , Fort Worth 
13 Helen Walton  85 18.0 United States United States , AR , Bentonville 
15 Kenneth Thomson & family  81 17.9 Canada Canada , Toronto 
16 Liliane Bettencourt  82 17.2 France France , Paris 
17 Bernard Arnault  56 17.0 France France , Paris 
18 Michael Dell  40 16.0 United States United States , TX , Austin 
19 Sheldon Adelson  71 15.6 United States United States , NV , Las Vegas 
20 Theo Albrecht  83 15.5 Germany Germany , Foehr 
21 Roman Abramovich  38 13.3 Russia United Kingdom , London 
22 Li Ka-shing  76 13.0 Hong Kong Hong Kong , Hong Kong 
23 Amancio Ortega  69 12.6 Spain Spain , La Coruna 
24 Steven Ballmer  49 12.1 United States United States , WA , Redmond 
25 Silvio Berlusconi 68 12.0 Italy Italy , North of Milan 
 
For billionaires with publicly traded fortunes, net worths were calculated using share prices and exchange rates from February 11, 2005.