Find the strike price where the most options expire worthless at expiry.
Max pain is the strike price at which the greatest total dollar value of open options contracts (both calls and puts) would expire worthless at expiration. The theory holds that market makers and large institutions, who are net short options, benefit most when the underlying closes at this price, causing maximum financial loss to option buyers.
Max pain is a controversial concept. Studies show the underlying asset closes near the max pain price more often than pure chance would suggest — particularly in highly optioned large-cap stocks around monthly expiration. However, it is not deterministic and should be used as one data point alongside technical analysis, not as a standalone signal.
Traders use max pain to anticipate potential 'pinning' — where a stock gravitates toward a specific strike in the final hours before expiration. If the current price is well above max pain, it may be a signal that the stock could pull back toward that level. It is most relevant in the last week before monthly options expiration.
Open interest is the total number of outstanding options contracts that have not been settled or closed. High open interest at a particular strike means many contracts are active at that level, making it significant for max pain calculations and support/resistance analysis. It differs from volume, which measures new contracts opened in a single day.
Yes. Max pain is recalculated as open interest shifts — traders open and close positions daily, changing the distribution of contracts across strikes. The max pain level can move significantly in the weeks leading up to expiration, particularly after large moves in the underlying or major macro events.