When markets opened on Thursday, Bezos had a net worth of $90.6 billion, putting him $500 million ahead of Microsoft founder Bill Gates.
Amazon stock opened up 1.6% on Thursday, adding $1.4 billion to Bezos’ net worth.
That was enough to put him ahead of Gates, who was last surpassed on Forbes’ real-time rankings for just two days nearly a year ago by Spanish retail giant Amancio Ortega.
Forbes started tracking billionaires around the globe in 1987. Bezos is now the seventh person to hold the title of the world’s richest person and the third American to top the global ranks besides Gates and Berkshire Hathaway CEO Warren Buffett.
Bezos would be nowhere close to being the world’s wealthiest person had Gates not given so much of his fortune to philanthropy. Gates, who created the Giving Pledge with Buffett to encourage billionaires to give at least half of their wealth to charitable causes, had given away $31.1 billion over the course of his lifetime through end of 2016.
Forbes estimates that Bezos, who has not signed the pledge, had given approximately $100 million to charity through the end of 2015. In June, Bezos tweeted out a request for ideas for his philanthropy, garnering thousands of responses.