Technology billionaires are making a run for the top of the global wealth rankings as surges for Facebook Inc., Inc. and Google parent Alphabet Inc. added $5.6 billion to their founders fortunes this week.Google co-founders Larry Page and Sergey Brin gained a combined $2.7 billion after the search engine s ad business reported a growing user base and better cost controls.

Jeff Bezos added $1.4 billion on Amazon s results while Mark Zuckerberg s net worth rose $1.5 billion after the social networking giant s second-quarter earnings trounced analysts estimates.Together with Larry Ellison, whose Oracle Corp. announced this week it would buy NetSuite Inc. for $9.3 billion, their combined net worth has risen by 9 percent in 2016.

That s more than double the combined gains recorded this year by the 395 other members of the Bloomberg Billionaires Index.Zuckerberg has added $7.9 billion to his fortune this year, more than any person on the index, and joins Bezos in a race toward the top of the ranking.

At the start of 2015, Zuckerberg was No.

13 on the index with $34.5 billion and Bezos No.

Bezos s fortune soared in 2015 and 2016 and he passed Warren Buffett as the world s third-richest person on Thursday, having briefly leapfrogged him last week.These gains are reshaping the dynamic at the top of the index.

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