>>509068557 (OP)It would be in stock that everyone would immediately sell which would cause the rest of his stock to decline in value even more.
He probably only has a hundred million in cash and there isn't enough liquidity to sell all of his stock.
By the time he sold all of it it would be worth several times less.
That's why net worth isn't a very good indicator of wealth.
The amount they would have if they sold all their stock should be factored in
Also them selling all of that would start a selling panic which would make it worth even less.
What they do is take on loans based on the value of their stock