For years, the world's five richest people comprised a little-changed group dominated by Americans, a European or two and, occasionally, a Mexican.

That changed this week. India's Mukesh Ambani overtook Steve Ballmer on Thursday to become the fifth-wealthiest person on the planet with with a net worth of $77.4 billion. On Friday, his wealth rose a further $3.5 billion, bringing him closer to Mark Zuckerberg.

The jump in ranking is just the latest milestone for Ambani, 63, whose fortune has surged by $22.3 billion since the beginning of the year.

The Reliance Industries Ltd. chairman has jumped nine places on the Bloomberg Billionaires Index since January as shares of his conglomerate have risen 145% from a low in March, buoyed by recent investments from firms including Facebook Inc., Silver Lake and BP Plc. Ambani's dealmaking has helped make India a bright spot for M&A during an otherwise barren year, with Indian news channel ET Now reporting that Amazon.com Inc. is in early talks for a stake in Reliance's retail division.

Ambani cracked the group of the 10 richest people just last month. Two weeks ago, he surpassed Warren Buffett, now ranked No. 6. He overtook Elon Musk and Google co-founders Sergey Brin and Larry Page days later.

The world's second-wealthiest Asian is Tencent Holdings Ltd. co-founder Pony Ma, who currently ranks 18th. Billionaires from the region have outperformed their peers from elsewhere this year, with the exception of Australia and New Zealand, according to the Bloomberg index, a ranking of the world's 500 richest people.

SOURCE: Bloomberg