forbes list doesnt count the personal wealth of some kings, dictators, so it's possible to exist out there
traders more rich than warren buffet that can hide their fortune?
IMHO it is not possible that an individual trader is richer than warren buffet or any others top 10 because of diminished return. When you have a very large capital, liquidity is an issue even if you trade forex.
Nevertheless a filthy rich individual trader is still possible.