Jeff Bezos added US$13b ($19.5b) to his fortune on Monday in what is believed to be the largest single-day wealth jump for an individual ever recorded.
The 56-year-old founder of Amazon's value grew US$74b this year to $189.3b, according to the Bloomberg Billionaire Index.
It comes after an 8 per cent climb in Amazon's share price on Monday, the most since December 2018, following rising optimism about web shopping trends. Amazon's shares are now up 73 per cent this year.
The rally, which puts Bezos' net worth at a higher valuation than some of America's largest blue chip companies, was also driven by renewed optimism in Amazon from analysts, who forecast sustained growth for the business.