The level at which stop out orders are automatically placed is when you reach 100% of your margin requirements. This, however, does not mean that your positions will be closed at exactly 100%. Stop out orders are, in fact, normal stop outs, which are converted into market orders and executed at the available price. For this reason, your positions may be closed well beyond the 100% limit and, in some cases (such as gaps), your account may go negative. It is therefore recommended that you keep sufficient collateral in your account and reduce your exposure at any time if necessary.