a lot of time if you trade a stock with zecco that did a r/s it will cause a margin call.. I have had this happen about 2-3 and messed the heck out of my account so I couldn't trade anything for a week or 2 pissed me off I could have sold one and made 100-200% after a r.s but I sold about 100 dollars worth when the price spiked and that caused a margin call and then I couldnt sell the rest at 200%