Earnings Volatility Crush (Selling the Event Premium)

Overview

The pattern here is one of the most visible and reliable in all of options: implied volatility on a single stock rises steadily into its earnings announcement, then collapses the moment the news is out.

The reason is obvious once stated. Before the announcement, nobody knows what the number will be, and the stock could gap in either direction. Options price that uncertainty in. The moment the results are released, the uncertainty is resolved. The stock does whatever it does, and then the option market no longer has an unknown event to price. Implied volatility drops, often dramatically, in a matter of minutes. Traders call this the IV crush.

If you sold options before the announcement, that crush is your profit. You sold expensive uncertainty and bought back cheap certainty.

That is the trade. It is well known, widely practised, and it comes with the single most brutal risk profile in this whole collection.

Where the edge actually is

Be careful here, because the crush by itself is not an edge.

Everyone knows the IV crush is coming. It is not a secret. The option market prices in the expectation that vol will collapse after the event. So simply selling options before earnings, on the theory that "IV always drops afterwards," is selling something the market already knows about.

The real question is narrower: does the option market overprice the size of the move, or not?

You can read the market's forecast directly. The price of the at-the-money straddle tells you roughly how much the market expects the stock to move. Compare that implied move to the distribution of the stock's actual historical post-earnings moves. If a name consistently has a 7 percent implied move and consistently gaps only 4 percent, that is a candidate. If it has a 7 percent implied move and routinely gaps 10 percent, selling it is a good way to lose money.

The edge, where it exists, is that the implied move tends to run slightly rich on average, in the same way all option premium runs slightly rich. It is a small edge on a very violent distribution.

Strategy logic

• Universe: Liquid single names with active option chains and a decent history of earnings events.
• Signal: Implied move from the straddle exceeds the historical average realized post-earnings move by a defined margin.
• Structure: Sell a strangle or straddle, then buy further out of the money wings to cap the loss. An iron condor is the standard defined-risk expression. Naked is not an option here, in any sense of the word.
• Timing: Enter one day before the announcement, when the implied vol run-up is close to complete. Exit the morning after, once the crush has happened. You are not holding for direction.
• Diversification: This only works as a portfolio. Any single event is close to a coin flip. The edge only appears across dozens of events.

Where it works and where it hurts

It works on large, mature, boringly predictable companies. Big consumer names, established industrials, mega-cap firms with analyst coverage so thorough that the actual result is rarely a surprise. Implied move of 5 percent, actual move of 3 percent, crush pays, repeat.

It hurts on high-growth names, on anything where the story is about guidance rather than the quarter just reported, and on any company where sentiment can flip. A single-name stock can, and routinely does, gap 20, 30 or 40 percent overnight on an earnings miss or a guidance cut. There is no stop loss that saves you from a gap. The market simply opens at the new price, and your short options are repriced instantly.

Do the arithmetic on that. If your typical winning trade collects a small premium, and one loser gaps four times further than you were paid for, you need a very large number of winners to recover from a single bad event. Traders in this strategy describe the experience as picking up pennies in front of a steamroller, and unlike some folk sayings, this one is quantitatively accurate.

Backtest design checklist

• Real option prices, on the correct dates. You need the chain the day before earnings and the day after. Reconstructed prices will not capture the run-up or the crush.
• Correct event timing. Whether a company reports before the open or after the close changes which day's prices you use. Getting this wrong is a subtle and extremely common lookahead bias that makes the strategy look far better than it is.
• Use a confirmed earnings calendar, as known at the time. Companies change reporting dates. Using today's revised calendar to backtest the past is a lookahead.
• Single-name option spreads are wide. Model them properly. This alone kills a large fraction of the theoretical edge, and it is why the strategy works far better on paper than in an account.
• Model early assignment on the short leg, particularly around dividends.
• Never remove the outliers. The temptation to exclude "the one crazy quarter" is enormous and it is exactly the wrong instinct. The outliers are the strategy's risk. A backtest with them trimmed is worse than useless, it is actively misleading.

Common failure modes

• Selling the crush without checking the implied move. The crush is priced in. If you are not comparing implied to realized, you have no edge, you just have a short gamma position over an event.
• Concentration. Five positions into earnings season, one gaps 30 percent, the year is gone. The strategy requires breadth to have any chance of working.
• Going naked for more premium. The wings look expensive and they feel like a waste of money for the eleven quarters when nothing happens. They are the entire reason you are still trading in quarter twelve.
• Holding for direction after the event. The edge is the crush, and it is delivered at the open. Everything after that is a directional bet you have no reason to be making.
• Chasing the names with the biggest premium. The premium is big because the market has correctly identified that the name is dangerous. High premium is not free money, it is a warning label.

Our notes and suggestions

This strategy is a good teacher because it makes the short-volatility bargain unusually explicit and unusually fast. You will collect many small wins and then, at some point that you cannot predict, you will take a loss that dwarfs all of them. That is not a flaw in your execution. That is the deal you signed up for.

If you trade it, trade it defined-risk, trade it wide, and trade it across enough names that no single result can matter much. Size every position as if it is the one that gaps 30 percent, because eventually one of them will be. And keep an honest record: a great many people believe they are profitable at this because they remember the winners and have not properly accounted for the one that got away.

What would change our mind: the implied move consistently coming in below the realized move across a broad sample, which would mean the market has stopped overpricing earnings uncertainty and the only thing left in the trade is the gap risk.