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Option pricing: market maker expectations vs. volatility-only models

Do market makers price options using only volatility, or is there any expectation of the stock going upwards or downwards factored into pricing?

25 days ago
5 replies Ask a follow up

Great question — the short answer is that market makers do embed directional expectations into options pricing, not just volatility. Here's how:

Volatility Is the Core, But It's Not the Whole Story

Market makers start with a volatility surface — a grid of implied volatilities across strikes and expirations. In a pure Black-Scholes world, all strikes would trade at the same IV. In reality, they don't.

The Skew Tells You Directional Expectations

The shape of the volatility smile/skew reflects directional bias in a way that raw IV doesn't:

  • Put skew (equity index markets): OTM puts almost always carry higher IV than OTM calls. That extra premium isn't random — it prices in the market's expectation that downside moves are sharper and faster than upside moves, and the demand from hedgers willing to pay for crash protection.
  • Call skew (commodities, some single stocks): When OTM calls trade richer, the market is pricing a right-tail event — fear of missing a supply shock or a squeeze.

The "Volatility" Is Partly a Mispricing Label

Black-Scholes says the expected drift of the stock doesn't matter for option pricing — it cancels out in the hedging argument. But that's the model's assumption, not the market's. What gets absorbed into "implied volatility" is actually a bundle: true expected volatility + jump risk premium + directional skew premium + supply/demand imbalances.

Practical Reality on the Desk

Market makers don't just plug a vol into a formula. They:

  • Quote skew directly: quoting calls and puts with different vols is functionally the same as saying "we think the distribution is asymmetric."
  • Delta-hedge dynamically but adjust for expected drift: if a market maker consistently sees buying flow in upside calls, they'll lift call vols not because vol changed, but because they're being picked off and need to price that adverse selection.
  • Use implied distributions: extracting risk-neutral probabilities from the option chain often shows a distribution with a fatter left tail than a lognormal — that's the market's directional expectation embedded in prices.

So yes: volatility is the pricing language, but directional expectation is absolutely baked into the vol surface itself. The separation between "vol" and "direction" is a modeling convenience, not a market reality.

about 1 month ago
4 replies Ask a follow up

But directional expectation only based on price action, liquidity, momentum - not a fundmanetal analysis, right?

about 1 month ago
3 replies Ask a follow up

Exactly right. The directional expectations embedded in options prices come almost entirely from market microstructure and flow dynamics, not from fundamental valuation work. Here's what drives it:

What Actually Moves the Skew

Order flow and positioning. If a large pension fund is rolling a put-hedging program, dealers absorb that flow and immediately reprice — they lift put IV not because they've decided earnings will miss, but because they're now short convexity in a downside tail and need to compensate for that risk. Same on the call side: if retail is piling into upside calls in a momentum name, dealers lift call IV to protect themselves from being run over.

Realized price action. If the stock is making sharp downside moves, recent realized vol spikes feed directly into how dealers set their surface. They're extrapolating the statistical behaviour of the asset, not forecasting earnings.

Liquidity and inventory. A market maker who is long gamma in a name can afford to tighten skew; one sitting on a large directional inventory will widen it. None of this reflects a view on whether the underlying is overvalued or undervalued — it's pure risk management of the book.

What's Missing

  • No DCF models. No one on a vol desk is updating a discounted cash flow model and then adjusting their SPX skew.
  • No fair-value analysis. The fundamental analyst might think the stock is 30% undervalued; the options desk doesn't care except insofar as that view might generate flow that hits their book.
  • No earnings forecast. An event vol spike ahead of earnings isn't the market maker forecasting the number — it's them pricing the binary gap risk and the supply/demand of straddles around the event.

The Division of Labor

The fundamental view lives in the cash equity and macro desks. The options desk takes that flow, delta-hedges, and manages the residual convexity and vega risk. They price based on what the market is doing and paying, not on what they think the company is worth.

about 1 month ago
2 replies Ask a follow up

If you had to take the view of options provider as an insurance company - should it take equity_fundamental analysis into account for pricing options? Is that expected from an insurance operation?

about 1 month ago
1 reply Ask a follow up

That's the right analogy, and it reveals exactly why the answer is mostly no, with one important exception.

The Insurance Company That Doesn't Argue With Actuaries

Think of a property insurer. When they price hurricane coverage in Florida, they don't debate the meteorology — they look at the actuarial data: historical storm frequency, severity distributions, correlation across policies, and the premium the reinsurance market is charging. If a climate scientist says "this decade will be worse," that view matters only to the extent it changes the price of reinsurance or the statistical model's inputs.

The options market maker is the same: their actuarial data is realized volatility, correlation structure, and the flow they're seeing. The "meteorologist" is the fundamental analyst, and the MM doesn't argue with them — but they don't pay them either.

Where Fundamental Analysis Would Actively Hurt

An options book that incorporated a fundamental view would actually be running a dangerous basis risk. Here's why:

You'd double-count. The fundamental view of the equity is already expressed in the spot price. If the stock is at $100 and your fundamental analyst says "this is worth $130," that view belongs in a long stock position, not in your options pricing. If you lower your put IV because you're bullish fundamentally, you're now undercharging for crash protection — and if the crash comes from a macro shock that has nothing to do with your company's fundamentals, you lose on both the options book and the directional call.

Adverse selection would eat you alive. The counterparty buying your options knows their own fundamental view. If you price based on yours and you're systematically more bullish than the marginal options buyer, you'll be a steady seller of cheap puts to people who know something you don't. An insurance company that charges below-actuarial-fair premiums because it "likes the neighborhood" goes bankrupt.

Correlation is invisible to fundamental analysis. A single-stock fundamental analyst studies the company. They don't model the covariance matrix of the book. An options book has hundreds or thousands of names. The risk that kills you is not Company X missing earnings — it's the correlation-1 event where everything sells off together. Fundamental analysis doesn't even attempt to price that.

The One Legitimate Exception: Event Risk

There is a narrow case where fundamental-style analysis leaks into pricing: idiosyncratic binary events — earnings, FDA decisions, antitrust rulings. Here, the historical vol surface is incomplete. The stock hasn't yet experienced this binary outcome, so pure statistical extrapolation breaks down.

In these cases, desks do estimate the magnitude of the expected move — often by looking at the company's own historical earnings gaps, peer reactions, and yes, sometimes the nature of the event itself. But this is still not "is the company undervalued." It's "what is the distribution of possible moves given a binary catalyst." That's not a DCF; it's a narrower form of event-risk modeling.

What an Insurance Operation Expects

A well-run insurance operation expects its underwriters to:

  • Price based on the risk pool, not individual optimism. The options MM prices off the vol surface and order flow, not a thesis.
  • Know their own cost of hedging and capital. The MM knows what it costs to delta-hedge and what vega/gamma exposure their balance sheet can carry.
  • Charge a spread for bearing unhedgeable tail risk. That's the skew premium — it compensates for gap risk that can't be continuously hedged.
  • Never confuse the insurance business with the prop trading business. If you want to express a fundamental view, do it in a separate book with separate risk limits.

So the answer is: a fundamental view is not an input to options pricing. It's a liability. The whole point of the insurance model is that you profit from the spread between implied and realized volatility across a diversified, hedged portfolio — not from picking the direction of individual names. Injecting fundamental opinion into that machinery corrupts the one thing the operation is supposed to be good at.

about 1 month ago