Volatility Crush Around Earnings
Options priced right before a big announcement carry a hidden number: the size of the move the market already expects. Miss that number and you can call the direction correctly and still watch your option lose money.
- What the market's priced-in move actually is, and where it comes from
- Why a correct direction can still lose money around an event
- How to check your risk before trading into earnings or any known event
- When buying into an event is a reasonable bet, and when it is a trap
You already met the IV crush a few lessons back: implied volatility spikes ahead of a known event like earnings, and collapses right after, sometimes sinking an option even when the stock moved the right way. It is worth a full lesson of its own, because the trap goes deeper than "volatility went down." There is a specific number hiding in that pre-earnings price, and traders who never learn to read it keep getting surprised by the same result.
The Market Already Has a Number in Mind
Before an earnings report, option prices are not just "expensive because people are nervous." They are pricing in a specific expected size of move. Add up the cost of an at-the-money call and put on the same stock and expiration, and you get a rough estimate of exactly how far the market expects the stock to travel, in either direction, by the time the dust settles.
Say Apple sits at $200 the day before earnings. The $200 call costs $6, the $200 put costs $5, for $11 combined. That $11 is roughly the market's expected move: about 5.5% in either direction. That is not a guess pulled from a headline. It is the market's own number, priced directly into the options.
That number is the whole story of this lesson. Every trade you make around an event is secretly a bet on whether the real move beats that number or falls short of it, whether you realize it or not.
Beating the Number, or Falling Short
This is the part that trips people up. It is not enough to guess the direction correctly. You have to beat the market's own number.
Apple reports earnings and rises 3%. You called the direction right. But the market had priced in a 5.5% move, and the actual move fell short of that. The uncertainty that inflated the price is now resolved, IV collapses, and the $200 call you owned sinks even though the stock went up, because it was carrying a bigger move's worth of hope value than the stock actually delivered.
That is the real lesson here. The stock does not need to fall for your call to lose money after an event. It just needs to move less than the market already expected.
Checking Your Risk Before You Trade the Event
You already have the tool for this from last lesson: IV rank. Before buying anything into a known event, check where IV rank stands. A stock heading into earnings with an already-elevated IV rank is carrying a large priced-in move, and a large crush is waiting the moment the news drops, no matter which way the stock goes.
- A large move is already priced in
- A large crush is coming regardless of outcome
- Favors selling premium, not buying it blind
- You are betting the actual move beats the priced-in number
- Being right on direction is not enough on its own
- Reasonable only with a specific reason to expect an outsized move
None of this means you should never touch an event. It means you should know exactly what bet you are making. Buying into an elevated IV rank ahead of earnings is a bet that the move outruns the market's own estimate, and that is a much harder bet to win than simply guessing up or down.
When I was advising clients, this was the single most common surprise I had to explain after an earnings season. People were right about the company and still lost money on the option, and the reason was never a mystery once you looked at the priced-in move. They had bought a big number and gotten a smaller one.
- Pre-earnings option prices carry a hidden priced-in move, roughly the cost of the at-the-money call and put combined.
- A correct direction is not enough. The actual move has to beat the priced-in number to win after the crush.
- Check IV rank before trading into any known event; elevated rank means a big crush is coming either way.
- Buying into that setup is a bet the real move outruns the market's own estimate, a harder bet than picking a direction.
Pop Quiz
Three quick questions to lock it in. Pick an answer and the explanation shows up right away.
How do you roughly estimate the market's priced-in move before earnings?
The combined cost of the at-the-money call and put is a rough estimate of the dollar move the market expects in either direction.
Apple rises 3% after earnings, but the priced-in move was 5.5%. What likely happens to a call you bought beforehand?
The direction was right, but the move fell short of the priced-in expectation. The IV crush can erase more value than the smaller-than-expected move added.
You see a stock's IV rank is already elevated heading into its earnings report. What does that tell you?
Elevated IV rank into a known event means the market has already priced in a big swing, so a crush is coming once the uncertainty resolves, no matter which way the stock goes.
Bottom Line
Every option priced right before a known event carries a hidden number: the size of the move the market already expects. Being right about direction is not enough to win, because that number has to be beaten, not just approached. Check IV rank before trading into any event, know exactly what bet you are making, and you will stop being surprised when a correct call still loses money.
Next up: Straddles and Strangles. You now understand the priced-in move. Next you learn the actual trade built to bet on it directly: buying a call and a put together to profit from a big move, in either direction, without picking a side.