Quote from Don Bright:
We are simply under the rule that Stocks $5.00 and under are subject to 100% margin. They are deemed "non-marginable" - we don't worry too much about it for larger trader sub-accounts, but when someone has 100% of their equity in some little stock AND has a lot of other positions and trading, well, we ask them to make adjustments.
Don
first of all as previously mentioned that is a House rule.
non marginable is not the correct term. from a legal point they can be margined at the current 50%. it is marginable but at 100 percent per some house rule.