Trump's losses have been put down primarily to a drop in real estate as well as a court case and declining numbers of visitors at some of his golf resorts.
The magazine this year attributed his plunge to a fall in the value of luxury real estate around midtown Manhattan, where the core of his wealth is tied up in half-a-dozen buildings.
Trump Tower fell in value by an estimated A$52m ($55m) last year as the rise of e-commerce ate into the worth of properties in previously lucrative shopping areas.
And another of his vast properties at 6 East 57th Street is facing the gloomy prospect of long-term tenant Nike moving out in the next few months.
Amazon boss Bezos sailed past Microsoft co-founder Bill Gates, who lost the top ranking for only the sixth time since 1995.
These days, Amazon sells almost everything imaginable online. It's now trying help people manage their lives with its digital assistant Alexa, which is implanted in its Echo line of internet-connected speakers.
- AP
