What Happens to Implied Vol After the Print

The event was a date. Then it is not.

Before earnings, a slice of the premium in the nearest expiry is there because nobody at the desk knows the words that will hit the wire. After the words hit, that uncertainty is smaller even if the stock has moved. Dealers who were long that event variance often have less reason to keep paying for it. The chain can cheapen while the underlying is still thrashing in after hours. Those two facts can sit on the same tape.

That cheapening is what traders shorthand as crush. We do not print a crush percent on the ticker page. We do not have a second live IV index on /t/SYMBOL. What we do print is the pre-event box we already computed, and later the realized session move against that box. Crush is context for why a quiet realized move can still have been an expensive night for someone who bought the straddle. It is not a third scorecard.

Inside the box is not “the market was wrong”

If the stock rallies 2% on a beat and the box was 5%, the recap says inside. That does not mean the company failed, and it does not mean options “overpriced” the event in a way you should fade next quarter. The straddle owner paid for a distribution. One draw from that distribution landing inside the box is a normal outcome. One draw landing outside is also a normal outcome. We label the draw. We do not write a morality play around it.

The same humility applies when the stock gaps 9% on a 5% box. Outside means realized variance outran the listed straddle for that session definition. It does not mean the next quarter’s box is cheap. Guidance, buybacks, and a changed story can reprice the name for months. Our recap stops at the session we scored.

Which session still matters

After-hours gaps get screenshotted first. Our stored prior-report actuals use daily bars: After Close is report day to next session; Before Open is prior close to report day. A name can look like it “crushed the box” at 5:12 p.m. and look inside by the next cash close. Both readings can be written down. They are not interchangeable. The after-hours explainer is the companion to this page.

What we will not add to look clever

No “fair value” IV target. No percentile rank against a five-year chart we do not host. No claim that a rich box is a short-vol setup. If you want the formula that built the box, use the implied-move note. If you want the vendor stack, use methodology. If you want the week’s names in sentences instead of tiles, use the analysis desk.