The world's top billionaires

US-based Forbes magazine has released its annual list of billionaires across the world. The entries' net worth is calculated as of March 2012
50 Carl Icahn.jpg
50 Carl Icahn Net worth: $14bn Source of wealth: Leveraged buyouts Age: 76 Country: USA
50 Birgit Rausing and family.jpg
50 Birgit Rausing and family Net worth: $14bn Source of wealth: Packaging Age: 88 Country: Sweden
48 Paul Allen.jpg
48 Paul Allen Net worth: $14.2bn Source of wealth: Microsoft, investments Age: 59 Country: USA
48 German Larrea Mota Velasco.jpg
48 German Larrea Mota Velasco and family Net worth: $14.2bn Source of wealth: Mining Age: 58 Country: Mexico
47 Phil Knight.jpg
47 Phil Knight Net worth: $14.4bn Source of wealth: Nike Age: 74 Country: USA
46 Vladimir Potanin.jpg
46 Vladimir Potanin Net worth: $14.5bn Source of wealth: Metals Age: 51 Country: Russia
45 Alexei Mordashov.jpg
45 Alexei Mordashov Net worth: $15.3bn source of wealth: Steel, investments Age: 46 Country: Russia
44 Steve Ballmer.jpg
44 Steve Ballmer Net worth: $15.7bn Source of wealth: Microsoft Age: 56 Country: USA
41 Michael Dell.jpg
41 Michael Dell Net worth: $15.9bn Source of wealth: Dell Age: 47 Country: USA
41 Vladimir Lisin.jpg
41 Vldimir Lisin Net worth: $15.9bn Source of wealth: Steel, transport Age: 55 Country: Russia
41 Azim Premji.jpg
41 Azim Premji Net worth: $15.9bn Source of wealth: Software Age: 66 Country: India
39 Cheng Yu Tung.jpg
39 Cheng Yu-tung Net worth: $16bn Source of wealth: Diversified Age: 86 Country: Hong Kong
39 Rinat Akhmetov.jpg
39 Rinat Akhmetov Net worth: $16bn Source of wealth: steel, coal Age: 45 Country: Russia
38 Alberto Bailleres Gonzalez.jpg
38 Alberto Bailleres Gonzalez and family new worth: $16.5bn Source of wealth: Mining Age: 80 Country: Mexico
37 Ricardo Salinas Pliego.jpg
37 Ricardo Salinas Pliego and family Net worth: $17.4bn Source of wealth: Retail, media Age: 56 Country: Mexico
35 David Thomson.jpg
35 David Thomson and family Net worth: $17.5bn Source of wealth: Media Age: 54 Country: Canada
35 Mark Zuckerberg.jpg
35 Mark Zuckerberg Net worth: $17.5bn Source of wealth: Facebook Age: 27 Country: USA
34 Michael Otto.jpg
34 Michael Otto and family Net worth: $17.6bn Source of wealth: Retail, real estate Age: 68 Country: Germany
32 Berthhold and Theo Albrecht Jr.jpg
Berthold and Theo Albrecht Jr Net worth: $17.8bn Source of wealth: ALDI stores Country: Germany
32 Iris Fontbona and family.jpg
32 Iris Fontbona and family Net worth: $17.8bn Source of wealth: Mining Age:69 Country: Chile
29 Lee Shau Kee.jpg
29 Lee Shau Kee Net worth: $18bn Source of wealth: Diversified Age: 84 Country: Hong Kong
29 Georgina Rinehart.jpg
29 Georgina Rinehart Net worth: $18bn Source of wealth: Mining Age: 58 Country: Australia
29 HRH Prince Alwaleed Bin Talal Alsaud.jpg
29 HRH Prince Alwaleed Bin Talal Alsaud Net worth: $21.3bn Source of wealth: Investments Age: 57 Country: Saudi Arabia\n\n(Figures from Prince Alwaleed's private office)
28 Alisher Usmanov.jpg
28 Alisher Usmanov Net worth: $18.1bn Source of wealth: Steel, telecoms and investments Age: 58 Country: Russia
27 Thomas Kwok (right) and Raymond Kwok (left).jpg
27 Thomas Kwok (right) and Raymond Kwok (left) and family Net worth: $18.3bn Source of wealth: Real estate Country: Hong Kong
26 Jeff Bezos.jpg
26 Jeff Bezos Net worth: $18.4bn Source of wealth: Amazon.com Age: 48 Country: USA
24 Sergey Brin.jpg
24 Sergey Brin Net worth: $18.7bn Source of wealth: Google Age: 38 Country: USA
24 Larry Page.jpg
24 Larry Page Net worth: $18.7bn source of wealth: Google Age: 39 Country: USA
23 Michele Ferrero (centre).jpg
23 Michele Ferrero (centre) with sons Pietro, (right), and Giovanni (left) Net worth: $19bn Source of wealth chocolates Age: 85 Country: Italy
22 George Soros.jpg
22 George Soros Net worth: $20bn Source of wealth: Hedge funds Age: 81 Country: USA
Lakshmi Mittal.jpg
21 Lakshmi Mittal Net worth: $20.7bn Source of wealth: steel Age: 61 Country: India
20 Micheal Bloomberg.jpg
29 Michael Bloomberg Net worth: $22bn Source of wealth: Bloomberg LP Age: 70 Country: USA
Mukesh Ambani.jpg
19 Mukesh Ambani Net worth: $22.3bn Source of wealth: Petrochemicals, oil and gas Age: 54 Country: India
18 S Robson Walton.jpg
18 S Robson Walton Net worth: $23.1bn Source of wealth: Wal-Mart stores Age: 68 Country: USA
17 Alice Walton.jpg
17 Alice Walton Net worth: $23.3bn Source of wealth: Wal-Mart stores Age: 62 Country: USA
16 Jim Walton.jpg
16 Jim Walton Net worth: $23.7bn Source of wealth: Wal-Mart stores Age: 64 Country: USA
15 Liliane Bettencourt.jpg
15 Liliane Bettencourt Net worth: $24bn Source of wealth: L'Oreal Age:89 Country: France
14 Sheldon Aldelson.jpg
14 Sheldon Alderson Net worth: $24.9bn Source of wealth: Casinos Age: 78 Country: USA
12 David Koch.jpg
12 David Koch Net worth: $25bn Source of wealth: Diversified Country: USA
12 Charles Koch.jpg
12 Charles Koch Net worth: $25bn Source of wealth: Diversified Age: 76 Country: USA
11 Christy Walton and family.jpg
11 Christy Walton and family Net worth: $25.3bn Source of wealth: Wal-Mart stores Age: 57 Country: USA
10 Kark Albrecht.jpg
10 Karl Albrecht Net worth: $25.4bn Source of wealth: Owner of Germany-based supermarket chain ALDI Age: 92 Country: Germany
9 Li Ka Shing.jpg
9 Li Ka-shing Net worth: $25.5bn Age: 83 Source of wealth: Diversified Country: Hong Kong
8 Stefan Persson.jpg
8 Stefan Persson Net worth: $26bn Age: 64 Source of wealth: H&M Country: Sweden
7 Eike Batista.jpg
7 Eike Batista Net worth: $30bn Age: 55 Source of wealth: Mining Country: Brazil
6 Larry Ellison.jpg
6 Larry Ellison Net worth: $36bn Age: 67 Source of wealth: Oracle Country: USA
5 Amancio Ortega.jpg
5 Amancio Ortega Net worth: $37.5bn Age: 75 Source of wealth: Zara Country: Spain
4 Bernard Arnault.jpg
4 Bernard Arnault Net worth: $41bn Age: 63 Source of wealth: LVMH Country: France
3 Warren Buffett.jpg
3 Warren Buffett Net worth: $44bn Age: 81 Source of wealth: Berkshire Hathaway country: USA
2 Bill Gates.jpg
2 Bill Gates Net worth: $61bn Age: 56 Source of wealth: Microsoft Country: USA
1 Carlos Slim Helu.jpg
1 Carlos Slim Helu and family Net worth: $69bn Age: 72 Source of wealth: Telecoms Country: Mexico