Bill Gates back on top as billionaire leader

The ranks of the world’s billionaires continue to scale new heights–and stretch to new corners of the world. Forbes’ global wealth team found 1,645 billionaires with an aggregate net worth of $6.4 trillion, up from $5.4 trillion a year ago. A record 268 new ten-figure fortunes, including 42 new women billionaires, were unearthed, another record. In total, there are 172 women on the list, more than ever before and up from 138 last year.

Bill Gates is back on top after a four-year hiatus, reclaiming the title of world’s richest person from telecom mogul Carlos Slim Helu of Mexico, who ranked No. 1 for the past four years. Gates, whose fortune rose by $9 billion in the past year, has held the top spot for 15 of the past 20 years. Spanish clothing retailer Amancio Ortega (best known for the Zara fashion chain) retains the No. 3 spot for the second year in a row, extending his lead over Warren Buffett, who is again No. 4.

The year’s biggest dollar gainer was Facebook’s Mark Zuckerberg, whose fortune jumped $15.2 billion, to $28.5 billion, as shares of his social network soared. Tech, and more specifically Facebook, helped propel numerous fortunes lately. The company’s COO, Sheryl Sandberg, joins the ranks for the first time, as does Facebook’s longtime vice president Jeff Rothschild. Also, thanks to a $19 billion deal  (including restricted stock) with Facebook, WhatsApp founders Jan Koum and Brian Acton join the ranks of Silicon Valley’s wealthiest for the first time. They are 4 of 26 newcomers whose fortunes come from technology, 10 of whom are American, including Dropbox CEO Drew Houston and Workday cofounder Aneel Bhusri.

Thanks to the tech boom, and strong stock market, the U.S. once again leads the world with 492 billionaires, followed by China with 152 and Russia with 111. But wealth is spreading to new places. We found billionaires for the first time in Algeria, Lithuania, Tanzania and Uganda. Also for the first time, an African, Aliko Dangote of Nigeria, breaks into the top 25. Worth $25 billion, he moves up 20 spots.-Forbes