Gap Risk

The risk that a stock's price will open significantly higher or lower than its previous close, with no trading occurring in between.

Gap risk is the danger that an asset's price will jump directly from one quote to another without any trading occurring in between. This phenomenon typically happens when markets are closed overnight, over weekends, or during trading halts. When the market reopens, the asset's price "gaps" up or down in response to new information, such as earnings announcements, macroeconomic data releases, or geopolitical events. For retail investors, gap risk is a critical hazard because it can bypass standard risk-management tools. For example, a traditional stop-loss order is designed to sell an asset once it touches a specified trigger price. However, if the price gaps past that trigger overnight, the order will execute at the next available market price, which could be significantly worse than the intended stop-loss level. To manage gap risk, investors can use guaranteed stop-loss orders (where offered by brokers for a fee), hedge their positions with options, or avoid holding highly volatile assets through major binary events like earnings reports. Understanding gap risk helps investors realize that historical volatility does not always capture the true potential for sudden, discontinuous losses.

An investor owns shares of Company XYZ, which closes the trading day at $50.00. The investor has placed a stop-loss order at $47.00 to limit potential losses. Overnight, Company XYZ releases a severe profit warning. The next morning, the stock opens for trading at $42.00. Because no trading occurred between $50.00 and $42.00, the stop-loss order is triggered and executed at the opening price of $42.00, resulting in a loss of $8.00 per share instead of the planned $3.00 per share.