Mukesh Ambani India's richest for 6th year, net worth $21.5 bn

Globally, Forbes said, the world's billionaire club has reached a record high level, with 1,426 persons and an aggregate net worth of USD 5.4 trillion (up from USD 4.6 trillion a year ago).

The US leads the list 442 billionaires, followed by Asia-Pacific (386), Europe (366), the Americas (129) and the Middle East & Africa (103).

Carlos Slim and Bill Gates have retained their top two positions, while Amancio Ortega of Spanish retailer Zara has moved up to the third position for the first time with the biggest gain of USD 19.5 billion to his fortune in year.

As a result, Buffett has slipped to the fourth rank, despite an increase of USD 9.5 billion in his networth. Forbes said this is the first year since 2000 that Buffett has not been among the top three.

Forbes said that it has included the fortunes of family members wherever one one person is the founder and in control of the business.

The figures are based on stock prices and exchange rates as on February 14, 2013, it added.

Those from India also include Uday Kotak, Micky Jagtiani, Cyrus Poonawalla, Adi Godrej, Jamshyd Godrej, Anil Agarwal, Kalanithi Maran, Gautam Adani, Malvinder and Shivinder Singh, Subhash Chandra and Desh Bandhu Gupta.

Other Indians include B L Munjal, Rahul Bajaj, Rajan Raheja, Habil Khorakiwala, N R Narayana Murthy, K Anji Reddy, MA Yusuff Ali, Vikas Oberoi, S Gopalakrishnan, Murali Divi, Nandan Nilekani, Ranjan Pai, Venugopal Dhoot,

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