Options Pinning – How Expiry Prices Gravitate Towards Strike Prices

1. What Is Options Pinning? Options pinning, also known as "pin risk" or "strike price magnetism," refers to the tendency of a stock or index to gravitate toward a specific strike price — usually one with high open interest — as it approaches the expiry of options contracts. 2. Why Does It Happen? Options pinning is often the result of hedging behavior by large institutions, market makers, and traders. Here's how: • Suppose the 22,000 strike has the highest open interest in both Calls and Puts. • As expiry approaches, institutions and traders holding short options may adjust their positions to keep the underlying near this level, minimizing their losses or keeping premiums. This is not manipulation, but a byproduct of how options markets and hedging work. 3. Key Indicators of Pinning • High Open Interest (OI) at a particular strike. • Price narrowing down to a strike in the last few hours of expiry. • Low volatility movement around the strike, especially after a trending day. 4. Impact on Traders • Option Buyers may see premiums decay rapidly if the stock stays “pinned,” leading to losses despite correct direction. • Option Writers benefit as theta (time decay) accelerates near expiry. • Breakout Traders may get trapped in false moves due to expiry-time consolidation. • Gamma scalping strategies might thrive in such conditions. 5. Real-World Example (Hypothetical) Let’s say Nifty is trading at 21,980 on expiry day: • The 22,000 strike has the highest OI in Calls and Puts. • Nifty may hover between 21,980–22,020 the whole day. • Even with strong morning movement, post-2 PM it may sharply revert toward 22,000, frustrating directional players. This phenomenon is commonly called “expiry game” among traders. 6. How to Use It Strategically • Avoid aggressive option buying near high OI strikes on expiry day. • Consider iron condors or short straddles near pinned strikes for range-bound expiry.