Around big options expiries you will hear "max pain" cited as if spot is magnetically dragged to a single strike. The reality is more nuanced: max pain is a useful reference, but the real force is dealer hedging, and conflating the two leads to bad trades.
What max pain is
Max pain is the strike price at which the largest total value of options expires worthless — the point of maximum loss for option buyers, and therefore maximum gain for sellers. It is computed from open interest across all strikes for a given expiry.
The folklore says price gravitates toward max pain into expiry. Sometimes it does. But max pain is a static accounting artifact of where OI sits, not a mechanism by itself. Treating it as a magnet that must be hit is overreach.
The real mechanism: dealer gamma
The genuine force is dealer hedging. Near a heavy expiry, dealers who are net long gamma hedge in a mean-reverting way — selling rallies, buying dips — which compresses volatility and tends to pin price toward strikes with large open interest. That pin often sits near max pain because that is where OI clusters, which is why the two get conflated.
When dealers are net short gamma instead, the effect inverts: hedging chases the move and amplifies it, and no pin forms. So whether an expiry pins depends on dealer positioning, not on max pain existing.
Concentration and timing
The pinning effect strengthens as expiry approaches and gamma concentrates, especially in the short-dated BTC and ETH options that now dominate flow. It is most visible in the final hours before a large Friday expiry, around strikes with the heaviest OI.
After expiry, that gamma rolls off. The stabilizing hedging flow disappears, which frequently releases pent-up movement — post-expiry range expansion is a recurring pattern as the pin lifts.
Using it
Treat max pain as a map of where OI and potential pinning sit, not a prediction. Confirm with the gamma regime: long-gamma into a heavy strike argues for fade-the-extremes, range behaviour into expiry; short-gamma argues for respecting breakouts. And position for expansion after expiry rather than expecting the calm to persist.
Takeaway
Max pain marks where the most option value expires worthless, but it is dealer gamma — not the number itself — that pins spot near heavy strikes into expiry. Pins form when dealers are long gamma and fail when they are short. Use max pain as an OI map, confirm with the gamma regime, and expect range expansion once the expiry gamma rolls off.