After declining about $20bn in 2018, Mark Zuckerberg's fortune is bouncing back.
Facebook shares jumped Thursday in New York trading - increasing his net worth by about $4.6bn - after the social-networking firm reported first-quarter earnings Wednesday night that won near-unanimous praise from Wall Street analysts.
That brings his year-to-date advance to $24bn, the most of anyone on the Bloomberg Billionaires Index.
Zuckerberg's gain tops that of Bernard Arnault, who has seen his fortune increase $23bn in 2019.
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Jeff Bezos would have topped both except for the finalisation of his divorce from MacKenzie Bezos, which cut his net worth by $36bn this month and wiped out his 2019 gains.
Facebook shares were up 7.2% to $195.78 at 09:55 and have climbed 49% this year.