What is Options Skew?
Options skew (also called volatility skew or IV skew) refers to the pattern of implied volatility across different strike prices for options with the same expiration date. In a theoretical Black-Scholes world, all options would have the same implied volatility. However, in real markets, implied volatility varies significantly across strikes, creating distinctive patterns that reveal market sentiment and fear levels.
The skew curve is a powerful tool for options traders because it shows where the market perceives risk. When out-of-the-money (OTM) puts have higher IV than ATM options, it indicates that traders are paying a premium for downside protection—a sign of fear or bearish sentiment. Conversely, when OTM calls have elevated IV, it suggests bullish speculation or anticipation of upside moves.
Types of Volatility Skew Patterns
Reverse Skew (Smirk)
OTM puts have higher IV than OTM calls. This is the most common pattern in equity markets, reflecting "crash phobia" where investors pay more for downside protection. Typically seen in SPY, QQQ, and individual stocks.
Volatility Smile
Both OTM puts and OTM calls have higher IV than ATM options. Common in forex markets and during periods of extreme uncertainty. Suggests the market fears large moves in either direction.
Forward Skew
OTM calls have higher IV than OTM puts. Rare in equities but can occur in commodities (supply shortage fears) or stocks with takeover speculation. Indicates bullish sentiment.
Flat Skew
IV is relatively constant across strikes. Indicates market complacency with no strong directional bias. Often seen during low-volatility periods or when markets are range-bound.
How to Use This Options Skew Analyzer
- 1
Enter Global Parameters
Input the current stock price, days to expiration, and risk-free rate. These are used to calculate implied volatility from option premiums.
- 2
Add Option Chain Data
Enter multiple strike prices with their corresponding option premiums. Include both puts and calls across a range of strikes (OTM puts, ATM, OTM calls) for the best analysis.
- 3
Analyze the Skew
The tool calculates IV for each strike and plots the skew curve. Review the sentiment analysis to understand what the skew pattern reveals about market expectations.
- 4
Identify Trading Opportunities
Use the 25-delta skew metric to find mispriced options. A steep skew may favor selling expensive puts, while a flat skew might make iron condors more attractive.
Trading Strategies Based on Skew
When Skew is Steep (High Put IV)
- Sell Put Spreads: Elevated put IV means higher premiums for selling OTM puts. Bull put spreads can capture this premium while limiting risk.
- Risk Reversals: Buy OTM calls (cheaper) and sell OTM puts (expensive) to establish a bullish position funded by the skew.
- Ratio Spreads: Sell more OTM puts than you buy ATM puts to take advantage of the IV differential.
When Skew is Flat
- Iron Condors: Flat skew means balanced wing pricing, making iron condors and iron butterflies more symmetric and easier to manage.
- Straddles/Strangles: With no directional bias priced in, volatility plays become more attractive if you expect a move.
When Skew Shows a Smile
- Butterfly Spreads: Sell the expensive wings and buy ATM options to profit from the smile shape.
- Calendar Spreads: If near-term skew is steeper than far-term, calendar spreads can capture the differential.
Understanding 25-Delta Skew
The 25-delta skew is a standard measure used by professional traders to quantify the steepness of the volatility skew. It's calculated as the difference between the implied volatility of a 25-delta put and a 25-delta call:
- Positive Skew (e.g., +5%): Puts are more expensive than calls, indicating bearish sentiment or fear of downside.
- Negative Skew (e.g., -3%): Calls are more expensive than puts, indicating bullish speculation or upside anticipation.
- Near Zero: Balanced market with no strong directional bias priced into options.