NEW YORK, Oct 27 — Jeff Bezos is on track to become the richest person on the planet.

Amazon.com Inc shares surged today, lifting its founder’s net worth by US$7.8 billion to US$91.3 billion as of 10am in New York, according to the Bloomberg Billionaires Index. The stock climbed 10 per cent to US$1,070.59, after the retailer reported results that beat Wall Street estimates. If the share gains hold through today’s close, Bezos will top the index for the first time.

His wealth briefly surpassed that of Microsoft Corp. co-founder Bill Gates on an intraday basis on July 27, but Amazon shares ended the day lower, leaving Bezos at No. 2.

Gates ended yesterday with a net worth of US$88 billion, US$4.5 billion ahead of Bezos on the Bloomberg index, a daily ranking of the world’s 500 richest people. Gates, 61, has been the world’s richest person since 2013.

Bezos also led the way on a morning that lifted the fortunes of some of the richest technology billionaires in the US by a combined US$17 billion. Alphabet’s Inc’s Sergey Brin and Larry Page, and Microsoft’s Steve Ballmer all added more than US$2 billion in the first 30 minutes of trading. Facebook Inc’s Mark Zuckerberg added US$2.1 billion. Gates, who has sold most of his Microsoft stake, added US$600 million.

Bezos, 53, has added US$18.1 billion to his fortune this year. Gates’s net worth rose by US$5.6 billion, even after he donated US$4.6 billion of Microsoft stock to the Bill & Melinda Gates Foundation in August.

Gates has given away almost 700 million Microsoft shares and US$2.9 billion of cash and other assets since 1996, according to an analysis of his publicly disclosed giving. He would be worth about US$150 billion if he hadn’t made the donations. — Bloomberg