A definitive list of the 12 richest tech billionaires in the world, who have a collective net worth of more than $990 billion

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12. Michael Dell

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Net worth:$36.8 billion

Age: 55

Source of wealth: Self-made; Dell

Net worth year-over-year change: Up by $5.96 billion in the last year.

11. Ma Huateng

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Net worth:$52.9 billion

Age: 48

Source of wealth: Self-made; Tencent Holdings

Net worth year-over-year change: Up by $14.3 billion in the last year. 

10. Jack Ma

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Net worth:$57.1 billion

Age: 56

Source of wealth: Self-made; Ali Baba 

Net worth year-over-year change: Up by $10.4 billion in the last year.

9. Mackenzie Scott

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Net worth:$57.8 billion

Age: 50

Source of wealth: Self-made; Amazon

Net worth year-over-year change: Up by $20.7 billion in the last year.

8. Sergey Brin

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Net worth:$69.2 billion

Age: 47

Source of wealth: Self-made; Google

Net worth year-over-year change: Up by $6.55 billion in the last year.

7. Larry Ellison

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Net worth:$70.8 billion

Age: 76

Source of wealth: Self-made; Oracle

Net worth year-over-year change: Up by $12 billion in the last year.

6. Larry Page

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Net worth:$71.4 billion

Age: 47

Source of wealth: Self-made; Google 

Net worth year-over-year change: Up by $6.82 billion in the last year.

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5. Steve Ballmer

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Net worth:$73.3 billion

Age: 64

Source of wealth: Self-made; Microsoft

Net worth year-over-year change: Up by $15.2 billion in the last year. 

4. Mark Zuckerberg

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Net worth:$96.7 billion

Age: 36

Source of wealth: Self-made; Facebook

Net worth year-over-year change: Up by $18.3 billion in the last year.

3. Elon Musk

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Net worth:$103 million

Age: 49

Source of wealth: Self-made; Tesla

Net worth year-over-year change: Up by $75.1 billion in the last year.

2. Bill Gates

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Net worth:$123 billion

Age: 64

Source of wealth: Self-made; Cash, Microsoft

Net worth year-over-year change: Up by $9.76 billion in the last year.

1. Jeff Bezos

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Net worth:$178 billion

Age: 56

Source of wealth: Self-made; Amazon

Net worth year-over-year change: Up by $63.4 billion in the last year.