#6 Anil Ambani

Age: 48

Fortune: inherited

Source: diversified

Net Worth: $42.0 bil

Country Of Citizenship: India

Residence: Mumbai , India, Asia & Australia

Industry: Diversified

Marital Status: married, 2 children

Education: University of Bombay, Bachelor of Arts / Science
University of Pennsylvania Wharton School, Master of Business Administration

The year's biggest gainer, Anil Ambani, is up $23.8 billion in the past year, and is closing gap with estranged brother, Mukesh, who ranks one spot ahead of him in the world at number five. The sons inherited their fortune from their late father, renowned industrialist Dhirubhai Ambani. But they couldn't get along and in 2005 their mother brokered a peace settlement breaking up the family's assets. A marathon runner, his biggest asset is his 65% stake in telecom venture Reliance Communications. He recently raised $3 billion from the highly anticipated initial offering of his Reliance Power, the biggest in India's history. Despite the hype, the stock tumbled 17% immediately after its February listing. In a bid to appease investors, company's board recently approved the issue of bonus shares. Still feuding with brother Mukesh: battling him in court over a gas-supply agreement.