Those are newbie questions but even if I traded stocks and forex during several years, I don't know much about prop firms Can someone tell me what would be the total cost (with and without using leverage) for this trade at a competitive prop firm: - buy 1000 shares at $50 - resell 5 days later those 1000 shares at 55$ ? Another question about leverage : prop firms give you more leverage than retail broker ok ! If you win they take a percentage of the profit for them but what happens if you lose more than your initial deposit on a leveraged trade ? What I mean is in this case is the extra leverage (and lost money) really the prop firm money or will this money be substracted/recovered from your future profits (if any and assuming you don't leave the firm the next month) ? To avoid this situation, do they cut automatically your losses at some point or sue you if you try to leave after a big loss ?