As we all know Motorola Mobility Holdings rocketedup 60% in pre-market trade today, from $24 to $38. However as the SB firm i trade through doesn't offer pre-market quotes, the 1st prices it gives is when the market opens at 2:30pm (UK time). And so as the last price being displayed before the pre-market was friday's close of $24.50, i created a buy order to be triggered at $24.73 for Â£5 per point. Hoping that the market would open, my trade would get filled if there was a few seconds of delay of price being updated, and then few seconds later it would gap up to today's price, and id have almost Â£6,000 net profit! However i made the huge huge huge mistake of not bothering to check the details of the buy-order closely enough, and so didn't check what the margin requirement was for this trade!!! :'( 2:30pm came and for the 1st 11seconds my SB firm was offering buy price of $24.50, however my order failed to execute!!! I got automated-email 1minute later notifying me that order had failed to execute due to insufficient funds in my account!! :'( What had happend was as i hadn't bothered to enter a manual stoploss for this trade, the had used the maximum margin requirement (380points per contract) for the trade as the requirement! And so they were saying that the margin-requirement to of made that trade was Â£1,900, but as i didn't have a spare Â£1,900 capital the trade failed to execute, but she then said that if i had entered a stoploss value that they would have executed the trade at that buy price!! :'( How the fcuk do you pyschologically cope with missing out on making a 400% risk-free return profit on your entire capital just because of a fat-finger mistake??!!