Seems like they are over hyping the margin call risk. It says in there that his total borrowing is ~500 million and his paper assets are estimated at $39 billi

Seems like they are over hyping the margin call risk. It says in there that his total borrowing is ~500 million and his paper assets are estimated at $39 billion. The debt is a lot in absolute terms but relative to his assets it is less than 2% of his wealth which seems really low to me.