Glossary Detail: Pinning
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Backtesting Pinning on High-Beta Names
Price gravitating toward a high-OI strike near expiration as market maker hedging creates a stabilizing force at that price level.
Further Details:
Pinning (or OpEx pinning) occurs when a stock's price is 'pinned' near a strike with very high open interest as options expiration approaches. This happens because market maker delta hedging at that strike creates a stabilizing force that resists price movement away from the strike.