Skew as a sentiment indicator (and when it lies)

The standard interpretation

Steep put skew = fear. Flat skew = complacency.

When investors pile into OTM puts, they bid those strikes up relative to ATM options. Skew steepens. When nobody cares, demand normalizes and things flatten out.

So steep skew means a crash is coming, right?

When skew misleads

Not so fast.

Skew reflects demand, but demand has a bunch of drivers that have nothing to do with anyone being scared.

Structural hedging is the big one. Pension funds, insurers, and structured product desks hedge because their mandate says they have to. That demand is mechanical. It's telling you about compliance requirements, not about what some PM thinks the market is going to do next quarter.

Crowded positioning is trickier. When everybody already owns protection, there's nobody left to buy on the way down. Steep skew can precede crashes and it can precede massive protection unwinds where vol just collapses. The signal is genuinely ambiguous.

Then there's dealer positioning. Market makers' gamma exposure affects how they quote skew. Negative gamma environments steepen skew whether or not anyone is actually fearful. It's plumbing, not psychology.

What skew actually tells you

Skew works better as a cost indicator than a sentiment indicator.

Question: "Is protection expensive or cheap?"
Answer: Check skew vs. historical range

Question: "Is a crash coming?"
Answer: Skew doesn't know

A more useful framework

Treat skew as a cost input instead of trying to extract a directional signal from it.

When skew is steep and you have high conviction on a drawdown, protection is expensive but could still be worth paying up for. When skew is steep and you don't have a strong view, spreads or ratios can reduce that skew exposure. Flat skew with genuine concern about downside is probably your best entry point for adding hedges cheaply. Flat skew with general complacency isn't a timing signal on its own, but worth monitoring for regime shifts.

The regime question

Skew behavior varies by regime, and this is where most analysis falls apart.

In low vol regimes, skew often stays persistently steep because protection demand exceeds supply. In high vol regimes, skew can actually flatten as realized catches up to implied. And in crisis regimes, skew sometimes inverts entirely with OTM calls getting bid as dealers scramble to cover.

You can't interpret skew without knowing which regime you're sitting in.

Practical application

Before acting on skew, compare current levels to their own history rather than looking at absolute levels. Check dealer positioning data where you can get it. Think about whether the demand driving skew is sentiment or structure.

There's a related question about term structure, specifically how skew behaves differently across expirations and what that interaction tells you. That's a separate piece.

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