That makes more sense. If someone had a margin call for listed stocks then they must sell 3 times the margin call of listed securities...so if they had a $150,000.00 house call (margin call) then they would have to sell $450,000.00 worth of listed stocks to meet the call, but only $150,000.00 of non-marginable stock (under $2 a share at UBS when I worked there) to meet the call. It would make sense to meet the call with non-margined stock.