The Volatility Smile is a term used to describe the relationship between implied volatility (IV) and the strike prices of options within the same expiration date. It visually appears as a U-shaped curve when plotted on a graph with strike price on the X-axis and implied volatility on the Y-axis.
This pattern shows that options with strike prices far from the underlying asset (either higher or lower) tend to have higher implied volatility than options near the spot price. Traders can use this pattern to identify market sentiment, forecast potential price movement, and structure their strategies to capitalize on these insights.
What Is the Volatility Smile?
In its simplest form, a volatility smile reflects the market’s pricing of risk. Normally, the implied volatility (IV) for at-the-money (ATM) options is lower than that for out-of-the-money (OTM) or in-the-money (ITM) options. This is because investors and traders believe there is more uncertainty about how far an asset’s price could move in either direction. The further the strike price is from the current market price, the more potential for volatility, hence the higher implied volatility.
The U-shaped curve appears because far OTM options (both calls and puts) see a rise in implied volatility due to the tail risk priced in by the market. Traders expect more drastic price movements to be reflected in these options. On the other hand, ITM options show similar behavior with higher implied volatility as well, as they are considered more sensitive to market movements.
How to Use the Volatility Smile in Trading: A Case Study with AAPL
Let’s take the example of Apple (AAPL), a popular stock often used in options strategies. Suppose you are analyzing the volatility smile for AAPL and notice that the implied volatility for strikes at $350, $375, and $400 (OTM calls) is significantly higher than that for the ATM strike at $300, where the implied volatility is lower.
This indicates that the market expects larger movements in AAPL’s stock price but isn’t confident whether these will be to the upside or downside. The higher implied volatility in the OTM calls and puts suggests a concern for large swings in price, perhaps due to an upcoming earnings announcement, major product launch, or broader market events.
Using the Volatility Smile for Option Strategy
In this scenario, a trader can leverage the volatility smile to set up a long straddle or a strangle strategy. Both of these involve buying a call and a put option simultaneously but at different strike prices. The trader can buy the ATM call and put options, which are cheaper than the OTM options due to their lower implied volatility, while also taking advantage of the higher IV in the OTM strikes.
Alternatively, the trader might decide to sell ATM options (where the volatility is lower) while buying the OTM options (where volatility is higher). This strategy is more of a short volatility play, where the expectation is that implied volatility will drop as the expiration date approaches, and the price of AAPL might not move dramatically in either direction. This benefits the trader because the time value of the ATM options would decay faster compared to the OTM options.
Another way to use the volatility smile is to sell volatility when implied volatility is high (in the OTM options), expecting it to revert to the mean. AAPL’s implied volatility might be elevated due to upcoming earnings, for example, and if the earnings announcement passes without major surprises, implied volatility would likely decrease, benefitting the trader who sold options with inflated premiums.
Check out this Video on how to read the Volatility Smile.
Risk and Reward with the Volatility Smile
Trading based on the volatility smile requires a strong understanding of the underlying asset’s price action, as well as the timing of when volatility is expected to change. It’s also important to manage risk carefully, as positioning in options with high implied volatility can be a double-edged sword. While buying options with higher implied volatility can result in substantial profits if the stock makes a significant move, they are also priced higher, meaning a larger move is required to break even or make a profit.
On the flip side, selling volatility works best when the market’s fear (and implied volatility) is at its peak but is expected to subside. The trader’s goal in this case is to sell overpriced options and collect the premium while waiting for implied volatility to drop.
Conclusion
The volatility smile is an essential concept for any options trader. By examining how implied volatility varies with different strike prices, traders can gain insights into the market’s expectations for future price movements. In the case of AAPL, understanding how volatility behaves across strikes can help a trader select the most effective options strategy, such as long straddles or selling volatility, to profit from expected market behavior. Additionally, staying mindful of changes in the volatility smile can help identify when market sentiment is shifting and when adjustments to the trading strategy may be necessary.