IV crush: why options can lose money after a perfect earnings call
Explain implied volatility crush, why options decay sharply after earnings, and why buying options into earnings is harder than it looks.
Lesson path
Stocks, ETFs, and Equities Macro
Earnings and Corporate Events
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Explain implied volatility crush, why options decay sharply after earnings, and why buying options into earnings is harder than it looks.
The mystery tax that disappears at 4:01pm
Options pricing has many inputs. The two big ones are how far the stock might move and how much time is left. Before earnings, nobody knows what the report will say, so the 'how far it might move' input is huge. Options get expensive. After the report drops, that uncertainty is gone — the news is the news. The 'how far it might move' input collapses, often by half or more in a single session. That collapse is called implied volatility crush, or IV crush.
Here is the painful version. You buy a call option going into earnings because you think the stock will rip. The stock reports, gaps up four percent, and you wake up smiling. You check your option — it is down twenty percent. What happened? The pre-earnings option price included a fat premium for the uncertainty of the event. That premium evaporated overnight. Your four percent stock move was smaller than the move the option was already pricing in. You were directionally right and still lost money.
How big is the 'move already priced in'? You can read it off the option chain. Look at the at-the-money straddle — the price of one call plus one put at the strike closest to the current stock price, for the expiration right after earnings. That dollar amount is roughly the move the options market is pricing in. If a stock at $100 has a straddle priced at $7, the market expects a roughly seven dollar move. Your bullish trade has to clear that bar for the option to win, not just be directionally right.
What is the takeaway for a beginner trader? If you are going to play earnings with options, understand that you are paying for two things — direction AND magnitude. The stock has to move further than the straddle is already implying. That is a tougher bar than people realize. Many professional options desks SELL premium into earnings to profit from IV crush rather than buying it. We are not recommending you do that with a $500 account — naked premium selling is high-loss-tail territory. The point is, the easy money in earnings options is rarely on the buy side.
Recap: pre-earnings options have a fat premium for the unknown. After the report drops, that premium crushes. You can be directionally right and still lose money. The straddle price tells you the bar to clear.
Knowledge check
Answer before moving on.
1. You buy a call option the day before earnings. The stock gaps up 4 percent. Your call is down 20 percent the next morning. What happened?
2. A stock is at $100. The at-the-money straddle for the expiration right after earnings is priced at $7. What does that tell you?
3. Why do professional options desks often SELL premium into earnings rather than buy it?
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