Expected Move Math Traders Actually Use the Night Before

The night before Micron, most desks glance at the front expected move implied by the ATM straddle (sometimes averaged with a delta wing package). That number is a market-implied distribution width — not a promise.

Use it like this

• Compare expected move to the last realized post-print move.
• Ask whether you are selling a move the stock has exceeded 2 of the last 4 times.
• Into MU's mega-guide context, remember guidance can move the stock more than the EPS line.

Paper the distance: if expected move is X% and your short-straddle break-evens sit inside recent gaps, size down.

If you want to rehearse the setup before you size it, paper-trade the scenario on Stock Picks.

Not financial advice. Verify claims independently.