CONCEPT / EXPIRATION
What Is Gamma Pinning?
Gamma pinning is a shorthand for a situation where concentrated options positioning may dampen movement around a reference area, especially near expiration. The effect is conditional and can disappear.
Why the term is used
When gamma exposure is concentrated near a strike or narrow band, hedging responses can appear to pull activity back toward that area under some conditions. Traders often call this pinning, but the label describes an observed structure hypothesis rather than a mechanical rule.
What to check
Read the concentration alongside the expiration, open interest quality, current regime, and the width of the surrounding structure. A narrow concentration with thin interest or a changing market regime should be treated cautiously.
- Confirm the expiration context.
- Separate concentration from actual price behavior.
- Look for persistence rather than one brief touch.
Why pinning can fail
Price can move through a concentrated zone when positioning changes, liquidity shifts, news arrives, or the remaining time to expiration changes the hedge response. Gamma pinning is therefore a context label, not a target or guarantee.
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