Max Pain Theory
Max Pain Theory is the hypothesis that the price of an underlying asset at options expiry gravitates toward the strike price at which the aggregate financial loss to all options holders — both call and put buyers — is maximised, theoretically benefiting net option writers.
Max Pain Theory, also called the Options Pain theory, was premised on the idea that option writers — who collectively held positions representing large open interest across multiple strikes — had an incentive and the potential market influence to push the underlying toward the strike price at which option buyers collectively suffered the greatest losses. The max pain point was calculated by summing the total value of outstanding options (in rupees) at each possible strike price if the underlying were to expire at that strike, and identifying the strike where the aggregate loss to option holders was highest.
In practice, the max pain calculation was straightforward: for each candidate expiry price, compute how much all in-the-money calls and in-the-money puts would collectively pay out, then identify the price level at which this total payout was minimised (equivalently, option buyer losses were maximised). On popular options analytics websites used by Indian traders, the max pain level was published daily for Nifty, Bank Nifty, and mid-cap index options, becoming a reference point during the last week before expiry.
Market practitioners in India treated max pain as a useful indicator with an important caveat: it was not a guaranteed outcome. The theory required that option writers had both the motivation and sufficient collective market power to influence the underlying's expiry price, which was credible in markets with concentrated open interest but questionable in highly liquid indices where global institutions participated. Empirical studies of NSE Nifty expiry data showed that the index settled within a range around the max pain level more often than chance would predict, but the relationship was far from deterministic.
Max pain was particularly discussed during weekly Nifty expiry sessions, where the rapid time decay of near-expiry options created large intraday moves that option sellers were said to benefit from. The term "expiry pinning" — where the underlying seemed to be held near a specific strike during the final hours of an expiry session — was frequently discussed among retail F&O traders on Indian financial forums, though attribution to deliberate manipulation versus natural market forces was debated.
SEBI's surveillance framework monitored for coordinated attempts to pin prices at specific levels ahead of options expiry, treating such activities as potential market manipulation. Independent of the manipulation debate, max pain remained a widely tracked data point among Indian F&O participants as a supplementary reference alongside open interest analysis, implied volatility skew, and put-call ratio when assessing likely near-term price behaviour around expiry.