Volatility Skew
The uneven shape of implied volatility across strikes and expirations, showing that some options are priced richer than others.
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Explained Simply
Volatility skew describes how implied volatility changes from strike to strike. In many stocks, downside puts carry higher implied volatility than upside calls because traders are willing to pay more for protection than for upside speculation. That creates a curve that is tilted rather than flat. A steep put skew often appears before earnings, during market stress, or in names that regularly gap lower.
Skew matters because it tells you where the market is most worried and whether a contract is expensive or cheap relative to nearby strikes. Two options with the same expiration can have very different prices if one sits on the side of the skew that traders are aggressively bidding up.
Why Volatility Skew Exists
Skew usually exists because traders demand more downside protection than upside speculation. Portfolio managers buy puts to hedge their books, and that demand pushes put IV higher. The result is a persistent premium on downside options.
Skew can also reflect dealer positioning. If traders keep buying puts, market makers may have to manage the risk by adjusting their hedges, which reinforces the pricing imbalance. That is why the downside side of the chain often looks richer even when the stock itself is calm.
How to Read Skew
A simple way to read skew is to compare implied volatility at equidistant strikes. If the 5% out-of-the-money put has much higher IV than the 5% out-of-the-money call, the market is paying more for protection than for upside.
That difference is useful in practice. A steep put skew can mean fear is elevated, downside hedging is crowded, or bearish protection is expensive. A flatter skew can mean sentiment is more balanced and the chain is less distorted.
Skew Types: Put Skew, Call Skew, and the Volatility Smile
Skew manifests in different shapes depending on the underlying asset and market conditions:
Negative skew (put skew): The most common pattern in equities. Out-of-the-money puts carry higher IV than out-of-the-money calls at the same delta. This reflects the persistent demand for downside protection from portfolio managers and the historical tendency of equity markets to fall faster than they rise. The 2008 financial crisis, 2020 COVID crash, and 2022 rate shock all validate this hedging demand.
Positive skew (call skew): Rare in equities but common in some commodity markets and individual stocks with high short interest or a takeover premium. Out-of-the-money calls are priced richer than puts. In individual stocks, positive call skew can appear before an anticipated announcement when traders expect a large upside move — earnings beats, FDA approvals, acquisition news. In meme stocks, call skew can become extreme as retail traders aggressively buy upside calls.
Volatility smile: When both out-of-the-money calls and puts carry higher IV than at-the-money options, the IV curve forms a U-shape or smile. Common in short-dated index options and currency pairs. The smile reflects that the market prices in tail events in both directions — a crash and a melt-up — at elevated premiums. The smile is often most pronounced for options expiring around binary events like elections or central bank decisions.
Term structure skew: Skew can also vary by expiration. Near-term options often show steeper skew around known events (earnings, FDA) than longer-dated options. After the event passes, near-term skew collapses (IV crush) while longer-dated skew is less affected.
Trading Strategies That Exploit Skew
Understanding skew creates actionable trade structures:
Risk reversals: Buy an out-of-the-money call and sell an out-of-the-money put (or vice versa) at the same expiration. When put skew is steep, the sold put is richer than the bought call — the trader receives net premium while getting upside exposure. A bullish risk reversal (long call / short put) benefits from steep put skew because you sell expensive protection and buy cheap upside.
Skew-adjusted strangles: In a standard strangle, a trader sells both an OTM call and an OTM put at the same delta. With steep put skew, the put credit is higher than the call credit at equal deltas. Adjusting the strangle by selling the put at a lower delta (further OTM) normalizes the premium collected while reducing downside assignment risk — a direct benefit of understanding skew dynamics.
Ratio spreads with skew: A put ratio spread (buy one put, sell two lower-strike puts) is more attractive when put skew is elevated — the sold puts collect disproportionately high premium. The trade profits when the stock stays above the short strikes and the elevated skew premium is captured.
Skew as a market sentiment gauge: When equity skew steepens suddenly without a corresponding move in spot price, it often signals that sophisticated traders are buying protection ahead of anticipated bad news. Tracking skew changes daily gives insight into institutional positioning that is not visible in price action alone.
How to Use Volatility Skew
- 1
View the Skew on Your Platform
Pull up the option chain and compare implied volatility across strikes for the same expiration. Most platforms display IV in a column next to each strike. You can also find a visual 'skew chart' that plots IV vs strike price.
- 2
Identify the Skew Direction
Most equity skew is 'negative' — lower strikes (puts) have higher IV than higher strikes (calls). This reflects the market's fear of crashes. When skew is steeper than normal, downside protection is especially expensive.
- 3
Compare Current Skew to Historical
Use your platform's volatility surface or third-party tools to compare today's skew to the 30-day or 90-day average. Steeper-than-normal skew means puts are relatively expensive; flatter-than-normal skew means puts are cheap.
- 4
Use Skew to Inform Strategy Selection
When skew is steep: sell OTM puts (they're expensive) via bull put spreads or cash-secured puts. When skew is flat: buy OTM puts for portfolio protection (they're cheap). Skew tells you which strikes offer the best value.
- 5
Trade Skew Directly with Vertical Spreads
If skew is unusually steep, sell a vertical put spread (short a higher-IV put, long a lower-IV put). You collect more than fair value because the short put's IV exceeds the long put's IV. This is a classic volatility arbitrage strategy.
Frequently Asked Questions
What is volatility skew in options?
Volatility skew is the difference in implied volatility across strikes and expirations. In many markets, puts on the downside trade at higher implied volatility than calls on the upside because traders pay up for protection.
Why are puts often more expensive than calls?
Puts often carry higher implied volatility because they are used as portfolio insurance. That demand raises the premium. In stressed markets, the effect can become extreme and create a steep skew.
How does skew affect options trading decisions?
Skew helps traders judge whether an option is rich or cheap relative to nearby contracts. It can influence strike selection, highlight stressed sentiment, and improve the interpretation of implied volatility and expected move readings.
What does it mean when skew collapses?
When put skew collapses — put IV falls toward call IV — it typically signals that protective demand is decreasing. This happens after a feared event passes without incident (post-earnings IV crush, resolution of a geopolitical concern), or during strong market rallies when investor anxiety fades. Collapsing skew can make previously expensive puts cheap to buy, creating opportunities for traders looking to add downside protection at reduced cost before the next period of elevated fear.
How is volatility skew different from IV rank?
IV rank measures the current overall implied volatility level relative to the past year's range — it tells you whether the entire chain is cheap or expensive compared to its historical norm. Skew measures the shape of the IV curve across strikes at a given moment — it tells you whether puts or calls are priced richer relative to each other. A stock can have low IV rank (options are cheap overall) but steep put skew (downside protection is still relatively expensive). Both dimensions together give a more complete picture of the options market's current state.
How Tradewink Uses Volatility Skew
Tradewink compares skew across the watchlist to avoid treating every option as if it were priced on the same curve. The AI uses skew to adjust strike selection, premium expectations, and volatility routing. When downside skew is unusually steep, the system treats the market as more defensive and may prefer defined-risk structures or delay entry until pricing normalizes. Skew also feeds into IV rank, implied move, and earnings screening.
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See Volatility Skew in real trade signals
Tradewink uses volatility skew as part of its AI signal pipeline. Get daily trade ideas with full analysis — free to start.