100 richest people: Meet the 10 richest Americans

The 100 richest people in the world gained $241 billion in net worth last year, according to Bloomberg's Billionaires Index. Americans dominated the list, occupying five of the top 10 spots. This countdown of the top 10 wealthiest Americans features a casino mogul, software tycoons, and a lot of Wal-Mart money. 

3. Charles Koch (tie)

Net worth: $41.3 billion

Wealth source: Koch Industries

Residence: Wichita, Kan.

World ranking Tied for 6th


The elder Koch brother is the CEO of Koch industries and, like his brother David, owns a 42 percent share in the company. The siblings have expanded dramatically the business they inherited from their father, Fred. Originally involved mainly in oil refining, Koch Industries is involved in a wide variety of ventures, including pollution control, minerals, and ranching. 

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