According to Forbes, which tracks which tracks the world's wealthiest people, Amazon's meteoric stock rise pushed his wealth to $90.6 billion. Amazon shares jumped 1.6 percent at the start of trading on Thursday.
Mr Bezos, a relative newcomer to the top of the Forbes list, has benefited from the seemingly boundless expansion of Amazon into new markets.
The once-bookseller plans to acquire Whole Foods Market Inc, at the same time it is making strides in the fashion business, film, enterprise computing and general retail from India to Mexico.
