The Expected Move Is a 68% Band, Not a Forecast

Your broker shows you an expected move before earnings. Plus or minus eight percent. Plus or minus twelve dollars. And almost everyone reads it as a forecast, a target, a hint about direction.

It is none of those things. That number is the options market openly admitting it does not know where the stock is going, and putting a price on its own uncertainty. Let me make that feel obvious, so the next time you see it you read it correctly in about two seconds.

Quick and important note: this is educational commentary, not personalized financial advice. I am walking you through a mental model, not telling you what to trade.

The wrong belief almost every trader holds

Most retail traders see an expected move of eight percent and think: the pros expect this thing to move eight percent, so if I think it moves more, I win.

That framing quietly assumes the number points somewhere. It does not. Once you see where the number actually comes from, the misconception dies on its own.

Where the number actually comes from

Take the simplest case. A stock trades at $100. Earnings are tomorrow. You look at the option that expires this Friday, and you buy both the $100 call and the $100 put. That combination is a straddle.

Say the call costs $4 and the put costs $4. You just paid $8 for the pair. That $8, roughly, is the expected move. On a $100 stock, that is plus or minus eight percent.

It is not a survey of analysts. It is literally the price of the nearest straddle.

What that $8 really means

Here is the part that reframes everything. The expected move is roughly one standard deviation. In plain English: the options market is pricing that, about 68% of the time, the stock lands inside that band by expiration.

68%. A little better than two-in-three. It says nothing about up or down. It is a range of doubt centered on today's price, not an arrow pointing at a destination.

Stock at $100, expected move of $8. The market is saying: about a two-thirds chance the stock finishes between $92 and $108. That leaves a full one-in-three chance it finishes outside that range.

Not a freak event. One in three. So when a stock blows through its expected move on earnings, the options market was not wrong. It told you that happens roughly a third of the time.

The durable handle

That tail is where retail gets emotionally destroyed. A stock gaps 12% and people scream nobody saw it coming. But an 8% expected move implies moves beyond 8% are normal and frequent.

Keep this: the expected move is a band of ignorance, not a bullseye. When you catch yourself treating it like a target, stop and remember it is one standard deviation of "we don't know."

Why the straddle is so expensive before earnings

Because implied volatility is jacked up. The market knows a news event is coming and inflates option prices to compensate sellers for the risk. The moment earnings drop, that uncertainty resolves and implied volatility collapses. Traders call it the volatility crush, or IV crush.

This is the trap. You can be right about direction, the stock moves your way, and your call still loses money because the volatility you overpaid for evaporated overnight.

The expected move is a break-even line

The expected move is really a break-even line for the person selling you that straddle. If the stock moves more than $8, the buyer wins. If it moves less, the seller keeps the premium.

So the second aha: the expected move is the market's fair price for the event, the point where buyers and sellers roughly break even. When you buy options into earnings, you are not betting the stock moves. You are betting it moves more than the expected move already implies. That is a much higher bar than most people realize.

Skew: which side is the market afraid of

The band is rarely perfectly symmetric. Compare the price of puts to calls at the same distance. If downside puts cost more than upside calls, that is skew, and it tells you the market is paying up for protection against a drop.

It does not predict a drop. It tells you where the fear is priced. Reading skew is how you go from "how big is the move" to "which side is the market more afraid of." That is genuine signal, sitting in the option chain for free.

What a disciplined trader does with this

1. Find the expected move first. Before any earnings trade, ask: do I think the stock moves more, or less, than this band? That single question kills most bad trades, because usually you have no edge on it.
2. Compare implied to realized. If a stock historically moves 5% on earnings and the market is pricing 10%, options look rich. If it usually moves 12% and the market prices 6%, they look cheap.
3. Respect the crush. A long call needs a move bigger than the expected move just to break even.

Where this transfers beyond earnings

Every options price you ever see contains an implied move for its expiration, not just around earnings. Weekly SPY options, a Fed meeting, a jobs report, a biotech readout. Same math.

Take the straddle. That is your one standard deviation, that is the 68% band, and roughly a third of the time price finishes outside it. Once you internalize that, you stop reading option prices as forecasts and start reading them as ranges of doubt with probabilities attached.

Next time your broker flashes plus or minus eight percent, you will not see a forecast. You will see a two-thirds band of doubt, a break-even line for the seller, and a bar you have to clear to win.

Want the full walkthrough with the numbers on screen? Watch the video here: https://youtu.be/xquWJPwt6Rg