Expected Move vs. Realized Move: The Only Earnings Vol Scoreboard

Every earnings debate collapses to one comparison: what did options imply, and what did the stock do? EPS badges and cable takes are noise beside that scoreboard.

What "expected move" means

The expected move is the market's estimate — embedded in option prices — of how far the underlying is likely to travel across the earnings window. Traders commonly back it out from the front ATM straddle (sometimes adjusted for strangle width or a documented expected-move formula). It is not a maximum. It is a priced distribution summary: enough premium that a one-standard-move outcome is roughly "paid for."

If the stock gaps 4% and the expected move was 7%, long straddles can lose even though "the stock moved." The move was smaller than what premium assumed. If the stock gaps 12% on a 6% expected move, short premium has a bad day regardless of IV crush helping on vega.

Building a personal scoreboard

For each name you care about:

1. Record the expected move (percent and dollars) the session before the print.
2. Record front IV (and IV Rank / Percentile) at the same time.
3. After the event window (gap + first regular session, or your predefined horizon), record the realized move.
4. Tag: realized under / near / over expected move.
5. Note guidance surprises separately — they often explain over-moves that "EPS beat" cannot.

Do this for a season and you will stop being surprised by crush. You will see which tickers chronically overprice the event and which ones underprice left tails.

Linking to the earnings vol premium

Research spanning tens of thousands of S&P 500 earnings events (2010–2025) finds implied vol on average overshooting subsequent realized vol by roughly mid-teens percentage points, with short-vol structures into the event showing positive average expectancy in sample — and sector differences (tech and communication names often showing wider IV–RV gaps than utilities). That is a structural backdrop, not a blank check to sell every straddle. Liquidity, surprise clustering in dense weeks, and fat tails still dominate single-trade risk.

Public Q3 2026 calendars pack banks and megacap tech into mid-to-late October. Overlapping binaries raise correlation: an index gap can push many single-name realized moves together even when idiosyncratic guides differ. Scoreboard your book at the portfolio level, not only ticker by ticker.

A disciplined workflow

• Prefer defined risk if you sell the event (iron condors, credit spreads) until your personal sample says otherwise.
• If you buy the event, prefer structures that reduce naked vega — or accept that you need an over-move large enough to beat crush.
• Never skip the IV Rank check: selling an un-ramped name harvests little premium; buying a fully ramped name pays max crush.
• Rehearse entries and exits on Stock Picks so the scoreboard drives behavior, not adrenaline.

Common scoreboard mistakes

• Measuring realized move from the wrong anchor (prior close vs. pre-market print vs. next close).
• Ignoring that AMC reports realize into the next cash session.
• Comparing expected move in percent to a dollar gap without converting.
• Sample sizes of three tickers and a narrative — keep a spreadsheet or you will remember only the wins.

What IVX adds

Term structure and skew tell you where fear sits; expected vs. realized tells you whether you were paid for it. Read the surface in sixty seconds, then keep the scoreboard for a quarter. That loop — glossary plus reps — is the product.

The market is not irrational when a "big" gap loses money for long premium. It is marking your trade against a bar you skipped.