What Is This?

The options market is not just a place where people buy insurance for their portfolios. It is one of the most influential forces acting on equity prices on a day-to-day basis, particularly around expiry dates. The dealers who sell options to clients must hedge their exposure by buying or selling the underlying shares. When those hedging flows are large enough, they can suppress volatility, create magnetic price levels, and then release violent moves when the hedging obligation disappears. Understanding options flow means understanding why price moves the way it does.

Gamma exposure, commonly abbreviated to GEX, measures the net gamma position held by market makers across all outstanding options. Gamma is the rate at which a dealer’s delta exposure changes as the underlying price moves. When market makers are net long gamma, they are natural stabilisers. As the market falls, they are buying shares to maintain their hedge. As the market rises, they sell shares. This suppresses large directional moves. When market makers are net short gamma, the opposite is true. They amplify moves because they must buy as the market rises and sell as it falls.

Max pain is a simpler concept. It is the price at which the maximum number of open options contracts expire worthless, meaning the options sellers, who are predominantly the market makers, experience the least financial loss. The observation that equity prices often gravitate toward max pain as expiry approaches is not mystical. It reflects the hedging behaviour of large participants adjusting their positions as time value decays.

How to Read It

GEX is typically displayed as a dollar value representing the total gamma exposure across the options chain. Positive GEX, measured in billions of dollars, indicates net long gamma for dealers. A reading of plus $2 billion in SPY gamma, for example, means dealers are significantly long gamma and are likely acting as a dampening force on volatility. Negative GEX indicates net short gamma, where dealer hedging amplifies moves.

The put/call ratio measures the number of put options traded relative to call options. A high ratio (above 1.2) indicates more bearish bets than bullish ones, which is often a contrarian bullish signal since it suggests excessive fear. A low ratio (below 0.7) reflects complacency or bullish excess. Like most sentiment metrics, extremes at either end are more actionable than moderate readings in the middle.

Advanced Applications

The gamma flip level is one of the most reliable and underappreciated concepts in modern equity markets. When the index is trading above the gamma flip, dealers are long gamma and act as stabilisers. When price falls through the flip level, dealers suddenly become short gamma and their hedging activity becomes procyclical, accelerating moves. This is why markets often appear to behave differently on either side of certain technical levels. It is not technical analysis creating support and resistance. It is gamma mechanics.

Options pinning is a related phenomenon that affects individual stocks and indices around expiry. When a stock has enormous open interest at a specific strike, market makers are incentivised to keep the price near that strike to minimise their own hedging costs. The stock appears to be glued to a level even as the broader market moves. Experienced traders use this knowledge both to identify where stocks will likely settle at expiry and to anticipate the release of that pinning effect once the contracts expire.

Vanna and charm are second-order Greeks that affect dealer hedging flows as volatility and time change. Vanna describes how delta changes as implied volatility moves. When VIX falls sharply, dealers with large vanna exposure must buy the underlying as their hedge requirement decreases. This creates a self-reinforcing rally: falling VIX triggers dealer buying which pushes prices higher which further reduces VIX. This cascade is one reason why post-fear rallies can be so sharp. Our intelligence pipeline monitors vanna and charm flows alongside GEX to provide a full picture of the options hedging landscape.

Practical Example: OpEx Thursday, June 2026

The OpEx Thursday session of June 2026 provided a textbook example of options mechanics in action. Heading into the session, SPX was trading above its gamma flip level, meaning dealers were net long gamma and had been a stabilising force through the FOMC week. VIX had been elevated coming into Wednesday’s decision as the market priced in uncertainty.

Once the Fed decision was absorbed and the market determined that no surprise had occurred, the chain reaction was predictable for anyone tracking the options structure. The put premium that had been protecting portfolios through the FOMC week became worthless rapidly as the expiry approached and the fear event passed. Vanna flows kicked in as falling implied volatility triggered dealer delta adjustments, which put upward pressure on equities. VIX collapsed 9.3 per cent on that single session.

The max pain level for that week’s options had been sitting at a level approximately 30 points below where SPX ultimately closed. As expiry approached and the hedging dynamics unwound, the index moved decisively toward the call wall, with dealer short covering adding momentum to the move. The session’s behaviour was not random. It was the predictable consequence of the options structure, visible in the data before the session opened.

See Live Options Intelligence Data

Our Options Intelligence page tracks GEX, max pain, gamma flip levels, call and put walls, vanna flows, and put/call ratios across indices and individual names, updated in real time throughout the session.

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