Donald Trump has seen $600 million wiped off his personal fortune during the past year.
But Trump, the first USA president to come exclusively from the private sector, is ranked 248 - sharing the spot with 27-year-old Snap co-founder and CEO Evan Spiegel, the youngest person on the list. The Manhattan tycoon ranked 156 in 2016, the year he was elected to the White House.
According to Forbes, half of Trump's wealth comes from New York City real estate.
The magazine attributed Trump's decline to "a tough NY real estate market, particularly for retail locations; a costly lawsuit and an expensive presidential campaign". After months of digging through financial disclosures and public property records and conducting dozens of interviews, Forbes now estimates POTUS' net worth at $3.1 billion, down from $3.7 billion a year ago.
Some of his golf properties, including those in Miami and overseas, also fell in value as people with opposing political opinions began to avoid them.
A lawsuit over the Trump University - which was accused of defrauding students out of thousands to learn the secrets of his success - was settled for $25m shortly after he won the presidency.
The biggest gainer in dollar terms was Facebook's Mark Zuckerberg, chalking up a $15.5 billion increase in net worth to retain his number four ranking at $71 billion.