Trump tumbled more than 100 spots to No. 544 on the magazine's 31st annual list, largely because of the impact of the slumping NY real estate market on his holdings.
Microsoft co-founder Bill Gates once again topped the Forbes magazine list of the world's more than 2,000 billionaires, while US President Donald Trump slipped more than 200 spots, the magazine said Monday.
Forbes pinned his wealth shrinkage on the receding real estate market.
Forbes updated list of the richest people on the planet, and multiple tech company founders and executives were scattered throughout the list.
The 2017 list is longer than it has ever been before - Forbes estimates there are now 2,043 billionaires worldwide, up from 1,810 in 2016.
Trump's current $3.5 billion net worth compares with $3.7 billion in October, when Forbes published its list of the 400 wealthiest Americans and a month before his Election Day upset against Democrat Hillary Clinton.
Mobile wallet Paytm founder Vijay Shekhar Sharma is ranked 1,567 with his net worth of $1.3 billion and is "one of the biggest beneficiaries of the government's decision to demonetise 86 per cent of India's rupees and move to a cashless economy", Forbes said.
Mr Trump would even have missed the huge Wall Street rally following his election, assuming he sold off his shares all during the campaign of last year's, the magazine said. Amazon's CEO Jeff Bezos, whose net worth increased by $27.6 billion to $72.8 billion, rolls in at third place.
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Here are the Thais on the Forbes list, by ranking and net worth.
This annual increase is at an all-time high in the 31-year history of the list, Forbes said.
The publication attributed his fall to the state of the Manhattan real estate market in which Mr Trump has invested a disproportionate amount of his fortune.
It is also noteworthy that the Asia Pacific region provided the most number of billionaires, totalling 720 with China alone supplying the most at 76 billionaires. "Lately, the neighbourhood has been struggling".
The magazine also said that his wealth was hit by $66m in political spending on his successful presidential campaign, as well as $25m to settle litigation he allegedly ripped off students at Trump University.
Among others in the Forbes top 10, Amancio Ortega of Spanish apparel chain Zara was fourth, Mexican telecom tycoon Carlos Slim was sixth, the Koch brothers, Charles and David, were eighth and ninth and former New York City mayor and Bloomberg News founder Michael Bloomberg was 10th.
Overall, there were 227 women billionaires, the majority of whom inherited their wealth.