Gap risk refers to the possibility of an underlying asset's price moving significantly upwards or downwards overnight, or over a weekend, without any trading activity occurring at intermediate price points. This creates a "gap" on the price chart. Such gaps can arise from unexpected news events, earnings announcements, geopolitical developments, or other material information released outside of regular market hours. For options traders, understanding gap risk is crucial because options are highly sensitive to the underlying asset's price movements.
When a stock or index gaps, its new opening price might be substantially different from its previous close. For instance, if a stock closes at $100 and opens the next day at $90 after negative news, there's a $10 downside gap. An out-of-the-money call option with a strike price of $105 might suddenly be even further out-of-the-money, losing significant value, or a put option with a strike of $95 might become in-the-money, gaining substantial value. This sudden change in the underlying's price directly affects the intrinsic and extrinsic value of options contracts, often without an opportunity for traders to react during the gap period.
The impact of gap risk is not limited to the direction of the gap. Volatility also plays a role. If a gap occurs, implied volatility for options on that underlying might increase, potentially boosting the extrinsic value of some options, even if their intrinsic value is negatively affected by the price movement itself. However, for options that are deep in-the-money or out-of-the-money after a gap, the change in intrinsic value often dominates. For example, a call option bought for a premium of $2.00 on a $100 stock with a strike of $102 might become virtually worthless if the stock gaps down to $95 overnight. Conversely, a put option with a $98 strike might become highly profitable in the same scenario, despite closing out-of-the-money.
Gap risk directly alters an option's intrinsic value by changing the underlying asset's price. It can also affect extrinsic value by influencing implied volatility. A significant gap can cause premiums to jump or plummet instantly.
Stop-loss orders are executed at the next available price once triggered. If a stock gaps down significantly below the stop price, the order will execute at the much lower open price, resulting in a larger loss than intended.
Yes, gap risk tends to be more impactful for short-term options because they have less time for the underlying price to recover from an adverse gap, and their premiums are very sensitive to immediate price movements.
While typically associated with downside, gap risk can create opportunities. A positive gap can significantly boost calls or decrease put values, offering unexpected profits for traders on the correct side of the move.
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