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