It's the first time that the three wealthiest people on the ranking made their fortunes from technology.
Zuckerberg's ascent to No. 3 underscores a sharp climb in Facebook shares since late March, when they was reeling following reports of a data-handling scandal with political consultant Cambridge Analytica. Since then, the tech giant has made a remarkable recovery, with its shares closing at an all-time high of $203.23 on Friday.
Zuckerberg is now worth $81.6 billion, almost $400 million more than Buffett, chairman of the Berkshire Hathaway investment group, rankings show. Overall, the sector has contributed about one-fifth of the $5 billion in wealth tracked by the index, Bloomberg reported. The ranking, which tracks the world's 500 richest people, is updated after the close of each trading day in NY.
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Buffett, who once ranked as the world's wealthiest person, has now slid down to number four, largely in part to his charitable giving. He's donated about 290 million Berkshire Hathaway Class B shares to charities, most of it to Gates's foundation.
The Facebook CEO's net worth as calculated by Bloomberg is $81.6 billion after the company's stock spiked 15 percent this year despite being embroiled in a data breach scandal.
Zuckerberg has pledged to give away 99 percent of his Facebook stock away in his lifetime, his Bloomberg profile shows.