A 1 percent pop in the shares of Amazon.com — the internet company Mr. Bezos founded, which accounts for the vast majority of his wealth — was enough to bump him over the wealth of Mr. Gates, the philanthropist and Microsoft co-founder, according to a real-time list of billionaires by Forbes.com, which has tallied the fortunes of the uber-rich for decades.
Forbes now estimates the wealth of Mr. Bezos, currently Amazon’s chief executive, at about $90.6 billion, compared with $90 billion for Mr. Gates.