Delta Hedging
The practice of options market makers neutralising their directional exposure by buying or selling the underlying asset as its price moves — the mechanism through which options flows feed directly into stock and futures prices.
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What Is Delta Hedging?
Delta is the rate at which an option's value changes for a $1 move in the underlying asset. A call option on SPX with a delta of 0.5 increases in value by $0.50 for every $1 rise in SPX.
Delta hedging is the practice of offsetting this directional exposure. A market maker who has sold a call option (net short delta) will buy the underlying to offset. As the price moves, the delta changes, so the hedge must be continuously adjusted — this is called dynamic hedging.
Why Delta Hedging Moves Markets
This is the critical insight: when dealers adjust their hedges, they buy and sell the underlying. The scale of the options market (trillions of dollars in notional) means these hedging flows can be significant drivers of market moves.
Long gamma (dealer bought options): As price rises, dealer's delta decreases → dealer sells underlying. As price falls, dealer's delta increases → dealer buys underlying. Dealers long gamma act as market stabilisers.
Short gamma (dealer sold options): As price rises, dealer's delta increases → dealer buys underlying (amplifying the move). As price falls, dealer's delta decreases → dealer sells (amplifying the fall). Dealers short gamma destabilise markets.
The Role of 0DTE Options
The explosion of 0-days-to-expiry (0DTE) options on the S&P 500 has made delta hedging flows an intraday phenomenon. When SPX moves near a large 0DTE strike, dealers may need to rapidly buy or sell hundreds of millions of dollars of futures to delta hedge — creating sharp intraday spikes.
GEX: Gamma Exposure
Market participants track "GEX" (Gamma Exposure) — the aggregate options market maker gamma across all strikes. Positive GEX = dealers are long gamma (stabilising). Negative GEX = dealers are short gamma (destabilising). Large negative GEX events often precede volatility spikes.
What to Watch
- Whether the market is in a "positive gamma" or "negative gamma" regime
- Large options strikes with high open interest (gamma pinning targets)
- Days when large options expire and dealer hedges unwind
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