A margin calls refers to the situation where a broker requires their customer, who has an open position with leverage, to post more collateral to maintain the position. These can be prohibitively expensive, especially when they occur due to a decline in the market value of the position. Margin calls may hit equity, forex or derivatives traders.
Leveraged trading is sometimes referred to as ‘trading on margin’, because only a margin is actually invested by the trader to open the position, the rest being covered by their broker. Normally the broker will have a maximum amount of leverage they are willing to offer, perhaps 80 or 90% of the position. If the value of the securities bought as collateral falls, then the broker may require additional margin be posted in order to support the original ratio. The minimum level of deposited funds is known as the maintenance level, and whenever the value of collateral falls below this level, a margin call occurs.
For example, imagine a brokerage account for a stock trader which offers up to 10-1 leverage and has a maintenance level of $6000. If a trader buys Stock X on a margin of 10 to 1, putting down $10,000 worth of stock as collateral, the broker lends the remaining $90,000 to buy $100,000 of stock. The trader of course expects the value of Stock X to rise, but instead it collapses.
If price of Stock X falls by half from $100 to $50, the value of the collateral falls to $5000, and the overall position to $50,000. This takes the trader below the maintenance level, and he will face an immediate margin call of $1000 to maintain his account. If necessary, the trader must liquidate other positions to cover the margin call, as otherwise he will be forced to sell at a highly unfavourable price.
Brokers use margin calls to ensure their client’s losing positions do not destroy the financial integrity of the brokerage. Because margin calls force the closure of positions, they are greatly feared by traders, who will use very tight risk management practices on leveraged trades to avoid them.
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