Meaning
Demands for additional funds or collateral from a broker or exchange occur when the value of a margin account falls below a required level. Receiving a margin call forces an investor to either deposit more cash or sell assets to cover the shortfall. This mechanism protects the lending institution from the risk of a client defaulting on a leveraged position.
Capital Demand
Requirements for maintenance margin are set by regulatory bodies and the policies of the specific brokerage. If the equity in the account drops due to market movement, the firm issues a notice for immediate payment. Failure to meet the demand within the specified timeframe results in the forced liquidation of positions.
This process happens automatically in most electronic trading platforms. Investors must maintain a buffer to avoid the risk of sudden liquidation during periods of high market volatility.
Collateral Threshold
Asset prices are monitored in real time to ensure the account remains properly funded. A sharp drop in the value of a single large position can trigger a call even if the rest of the portfolio is stable. The amount of the call is the difference between the current equity and the required maintenance level.
Liquidation Risk
Selling assets into a falling market to meet a call can lead to significant losses for the investor. These forced sales often add downward pressure to the price of the asset, creating a feedback loop. Professional traders use stop loss orders to avoid the sudden impact of these demands.