You can have a margin call on penny stock It must alway be cash!!! Another regular stock you can I do not think you can us margin on a stock less than $5.00 I believe!!! Could be it can not be less than$1.00 but I I think it is 5.00 And you have to have 25,000 in value and I think it can not be in penny stock I could be wrong on that!!! I have not used margin in over 25 years