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How positioning shapes the trading day.

Seven short pieces on the vocabulary of index options structure. Public knowledge, explained carefully. No advice, no numbers of ours.

What the gamma flip is, and why the tape feels different on either side of it
Plain-English explanation of the gamma flip level in index options: why moves get absorbed above it and extend below it, and how dealer hedging creates that.
5 min
Call walls and put walls: where the open interest lives
What a call wall and a put wall are on an options chain, why price tends to slow near them, and how to read open interest by strike.
4 min
The expected move: what the options market is pricing for the day
How to read the expected move from an at-the-money straddle, what one standard deviation means for a trading day, and why 0DTE changed how it is used.
5 min
Positive-gamma days and negative-gamma days
Two kinds of trading session created by dealer hedging: range-bound days where moves are absorbed, and trending days where they extend. How to tell them apart early.
4 min
Why price pins near big strikes into expiration
Expiration pinning explained: how hedging around a strike with heavy open interest narrows the range into the close, and why it is a tendency rather than a rule.
4 min
Why a level with history matters more than a line
What gives a price level meaning: touches, memory, and whether it has been used up. A simple way to think about how much a level has left.
4 min
VIX to daily range: the divide-by-16 rule
How to turn a VIX reading into an expected one-day percentage move, why the divisor is 16, and how to use it as a sanity check on the options-implied range.
3 min