Buying Options Before Earnings: The Move Is Already Priced

Take a hypothetical stock at $80 the afternoon before its report. The at-the-money straddle for the first expiration after the date costs $6.40. Divide one by the other. The market expects a move of about 8%.

Anyone buying calls, puts or both before the report has to beat that 8%. A move alone won’t pay you. You need the stock to travel further than a crowd of other traders, all with money on the line, already expects it to travel, and you need that to happen before the volatility you paid for drains away.

The straddle is a price, and it already includes the obvious

A straddle is a call and a put at the same strike and expiry. Its cost tracks implied volatility. That climbs into a report, because everyone knows a jump is coming, so the straddle carries the market’s collective answer to one question: how far will this stock travel once the numbers are out? The expected move formula, which multiplies the price by implied volatility and by the square root of days/365, gets you a close cousin of the same figure from the option chain.

Traders who buy options before earnings usually have a view. The quarter will be strong. Guidance will disappoint. The stock always runs on reports.

All of that is public.

The sellers of the straddle have heard every one of those stories and priced them in, which leaves the buyer needing a view about size, and most people buying calls into a report have never checked what size they’re paying for.

A correct call on direction can still lose

After the report, implied volatility usually falls sharply. The unknown is now known. The part of the option’s price that was paying for uncertainty drains out in one morning, whichever way the stock went.

Say the hypothetical stock opens at $84. You were right. It went up. The $80 call is now $4 in the money and the put is close to worthless, so with only days left on the expiry the straddle might trade not far above $4, against the $6.40 you paid, which leaves you right on direction and down on the trade.

Buying only the call shrinks the problem without removing it. The call’s premium was swollen by the same pre-report volatility, and a $4 move inside a $6.40 implied range can leave it worth less than you paid, or barely more, once that volatility collapses at the open. The mechanics are laid out in why a call can lose money when the stock rises.

The strongest objection: some reports blow through the implied move

They do. Every trader remembers a report where a stock gapped twice the implied range and a cheap-looking straddle paid several times over.

That possibility is in the price.

The people setting the straddle’s cost remember those reports too. The implied move is an average across outcomes that include quiet reactions, ordinary ones and the occasional blowout. When you pay $6.40, part of it is the charge for the chance of a huge gap. Collecting on the huge gap proves the trade was cheap about as well as a paid-out insurance claim proves the premium was a bargain.

So narrow the question. Over its own history, does this particular stock tend to move more than its options imply? Sometimes it does. You have to check.

How to check your own view before you pay

Start with the expected move calculator. Put in the price, the implied volatility for the first expiry after the report and the days to expiry. Write down the implied move in dollars and percent.

Then go back through the stock’s own reactions. Open a daily chart. Mark each past report date. Measure from the close before to the close after. List them.

Now compare.

Past reactions that cluster well inside the implied move mean buying options is paying up for movement that rarely comes. Reactions that often exceed it suggest the options may be underpricing this name, and a long straddle or a directional option has a case. When they’re scattered on both sides of the line, you have no edge on size at all, and a view on direction by itself won’t make up for paying full price for a move you can’t expect to beat.

The verdict: pay for the move only when you think it’s too small

Buying options into earnings is a bet on size against a price the market has already set, so skip it unless your own check says this stock regularly beats its implied move. Want exposure through the report anyway? Shares or a smaller position keep you clear of the volatility collapse. If you don’t want the gap at all, stepping aside before the report is a legitimate choice.

The argument has limits. It applies to options that expire soon after the report. There the event is most of what you’re paying for. Options with months left carry far less of the earnings premium, so the post-report drop in volatility bites less, and none of this counts against using options to hedge a stock position you already hold, where overpaying a little for protection can be a reasonable cost of staying in through a report you’d otherwise have to sit out.