Most of Bezos' fortune is tied up in Amazon stock, which soared 59 percent during the period tracked by Forbes.
Bezos has used a sliver of his wealth to buy The Washington Post — a target in Trump's fusillades against the media — and to finance Blue Origin, a maker of rockets that aim to sell flights into space.
Meanwhile, Amazon has expanded beyond its bookselling origin to become a retailer of almost everything imaginable . It now even sells groceries in brick-and-mortar stores after its $13.7 billion purchase of Whole Foods Markets last year.
Amazon also has built a network of data centers that hosts the online services of other companies, and produces award-winning shows that compete against traditional TV networks. More recently, it branched into health care in a partnership involving Berkshire Hathaway and its CEO, Warren Buffett, whose $84 billion fortune ranks third on the Forbes list.
Bill Gates, Microsoft's co-founder and an occasional bridge partner of Buffett's, ranks second on the Forbes list with wealth of $90 billion.
Both Gates, 62, and Buffett, 87, have committed to giving away most of their wealth while Bezos, 54, hasn't said much about his philanthropic plans.