Every quarter, the same thing happens. A company reports earnings after the bell. The stock gaps 8% the next morning. And someone in your group chat says, “I had no idea it would move that much.”
But the options market told you exactly how much it expected the stock to move. It was sitting right there in the chain. You just had to know how to read it.
What Is an Implied Move?
The implied move is the market’s best estimate of how far a stock will move over a specific event, usually earnings. It’s derived from options pricing, and it represents the expected range that options traders are collectively betting on.
If Apple’s implied move before earnings is plus or minus 5%, the market is saying: “We think Apple will land somewhere between 5% higher and 5% lower after the report.” That’s the expected range. Not a prediction of direction. A prediction of magnitude.
This number is incredibly useful because it tells you what’s already priced in. If you think Apple will move 3%, the market already agrees with you. There’s no edge there. But if you think it’ll move 8%? Or barely move at all? Now you have something to trade against.
How to Calculate It
The fastest way to estimate the implied move is with the straddle method.
Find the at-the-money straddle for the expiration closest to the earnings date. That means the call and put at the strike price nearest to the current stock price, both expiring right after earnings.
Implied Move = (ATM Call Price + ATM Put Price) / Stock Price
Example: Stock is at $150. The ATM call (150 strike) expiring Friday is $5.50. The ATM put is $5.00.
Implied move = ($5.50 + $5.00) / $150 = $10.50 / $150 = 7.0%
The market expects a roughly 7% move in either direction. That means the expected range is about $139.50 to $160.50.
Some platforms calculate this for you automatically. Thinkorswim shows it right on the trade page. But knowing the math means you can sanity-check any number you see, and you’re never dependent on a platform getting it right.
Is the Market Usually Right?
Sort of. Research from multiple sources shows that the options market tends to overestimate the size of earnings moves. On average, stocks move less than implied about 60-65% of the time.
This makes intuitive sense. Options buyers are paying up for the possibility of a big move. That extra demand inflates premiums, which inflates the implied move. The market prices in a worst-case scenario, and the worst case doesn’t usually happen.
But here’s the catch. That other 35-40% of the time? When the stock moves more than expected? Those are the ones that blow up accounts. A stock that was “supposed” to move 5% gaps 15% and suddenly your short straddle is a disaster.
The average overestimates the move. The outliers destroy the average. Both things matter.
Selling Premium Into High IV
The most common earnings strategy among experienced options traders is selling premium when IV is elevated.
The logic is straightforward. IV spikes before earnings. Options get expensive. You sell those overpriced options, collect the premium, and then IV collapses after the announcement (IV crush). Even if the stock moves, the IV contraction works in your favor.
Iron condors are popular here. You sell both a call spread and a put spread outside the implied move range. If the stock stays inside your expected range, both spreads expire worthless and you keep the premium.
Say the implied move is 6% on a $100 stock. You sell the 94/92 put spread and the 106/108 call spread. As long as the stock stays between $94 and $106, you profit.
The risk: if the stock blows past one side, your loss is capped by the spread width minus the premium collected. Defined risk. Known max loss.
Success rate on this approach? If you set your strikes at 1x the implied move, you’ll win roughly 60-65% of the time based on the historical overestimation pattern. Wider strikes increase your win rate but reduce your premium collected.
Buying When IV Is Cheap
Sometimes IV is unusually low heading into earnings. Maybe the stock has been dead quiet for months. Maybe the market is distracted by something else. Whatever the reason, options are cheap.
This is when buying premium can make sense. You’re paying below-average prices for exposure to a potential big move.
Long straddles or long strangles work here. You buy both a call and a put, profiting if the stock moves far enough in either direction to cover the cost of both positions.
The key metric: compare the current implied move to the stock’s average actual earnings move over the past 4-8 quarters. If a stock has averaged 8% moves on earnings but the current implied move is only 5%, that’s a potential opportunity. The market is underpricing the expected reaction.
This doesn’t work often. Most of the time, selling premium is the higher-probability play. But when you find genuinely cheap IV before a catalyst, the payoff can be significant.
Risk Management Around Earnings
A few rules that will save you real money.
Size small. Earnings are binary events. The stock goes one way or the other, and you find out in a matter of hours. Never put more than 2-3% of your portfolio into a single earnings trade. The variance is too high.
Define your risk. Use spreads instead of naked positions. An iron condor has a known max loss. A naked straddle does not. The difference between those two things is the difference between a bad week and a blown account.
Watch for pre-announcement drift. If a stock runs 10% into earnings on bullish sentiment, the risk/reward changes. The good news might already be priced into the stock, not just the options. A “beat” could still result in a sell-the-news reaction.
Avoid holding weekly options through earnings unless that’s the explicit trade. If you bought calls for a different thesis and earnings happen to fall during your holding period, you’re taking on event risk you didn’t plan for. Close the position or adjust it before the announcement.
Reading the Market’s Expectations
The implied move is one of the cleanest signals the options market gives you. It tells you, in plain numbers, what the collective wisdom of thousands of traders expects to happen.
Your job isn’t to blindly agree with it or fight it. Your job is to decide whether you think the market is overpricing or underpricing the event, and to structure a trade that reflects your view with risk you can afford.
That’s earnings trading. Not gambling on direction. Pricing the event correctly and getting paid when you’re right about the magnitude.