Gates's wealth then slumped with the dot-com bubble burst, and he regained the title of centibillionaire only in 2019.: The rally in tech shares has taken the number of people with fortunes of more than $100 billion to eight. Google co-founders Larry Page and Sergey Brin joined the exclusive club last week, entering a group dominated by US tech entrepreneurs, according to the Bloomberg Billionaires Index. The world’s eight richest people together hold fortunes of more than $1 trillion and have added $110 billion combined this year.