With a net worth of $23.2 billion, Mukesh Ambani, the chairman of Reliance Industries Ltd (RIL), is the highest-ranked Indian in the list, at No. 33.
Simon, 82, the co-founder of Simon Property Group, has a net worth estimated at $2.8 billion, the same as previous year, Forbes said.
As the New York's real estate market has slowed, Forbes began downgrading Trump's net value past year, saying in October that his net worth was down to $3.7 billion.
Chaudhary's conglomerate Cinnovation/CG Group's assets include a controlling stake in Nabil Bank, a fast-growing foods business best known for the instant noodles brand Wai Wai and a string of hotels in Asia, and more recently in Africa, where in a joint venture with Uganda's Mukwano Group, he is building hotels in Uganda and Rwanda.
In the United States, Carl Cook trails just behind Stan Kroenke, who grew famous previous year for becoming St. Louis' favorite villain by moving the Rams football team to Los Angeles.
With an estimated $86 billion wealth, the a href="http://beta.fortune.com/fortune500/microsoft-25/?iid=sr-link1" Microsoft /a (msft) cofounder and philanthropist has held the top spot for four consecutive years, Forbes reports.
But none cracks the top 50 in Forbes' 31st billionaires list: 2,043 people with an average net worth of $3.75 billion.
"Midtown Manhattan real estate is down; therefore, so is Donald Trump's fortune", Forbes said.
The US has the most billionaires with its 565, next comes China at 319, Germany is third with 114, and India with 101 takes fourth spot.
The other two being the co-founders of Snapchat. In a personal financial disclosure form filed with the federal government previous year, Trump said his net worth was over $10 billion. He was in the sixth position past year. Bezos posted the largest gain of wealth on the list - a $27.6 billion increase - thanks to the surge of Amazon shares.
David Thomson and family, whose estimated fortune of $27.2 billion U.S. put them at 24th position. Overall, each billionaire had a richer year compared to the year prior. But the list also contained 15 new "self-made" women, mostly from Asian countries, including Vietnam's Nguyen Thi Phuong Thao of budget airline VietJet air.
Trump saw his net worth fall from $4.5 billion past year to $3.5 billion Monday, the day the newest ranking was published.
Rising oil prices are also cited another key reason for the rise in the fortunes of some other of the wealthy people on the Forbes list.