Why Options Volume Has Exploded

US equity options volume in 2023–2024 averaged roughly 42–46 million contracts per day, up from approximately 17–18 million in 2014. That is an increase of more than 150% in a decade. Over the same period, US equity stock volume grew from roughly 7 billion shares per day to around 9–10 billion — an increase of about 30–40%.

The divergence is not noise. It reflects a fundamental shift in how institutions, funds, and retail participants manage risk and express directional views. Options have become the primary tool for both hedging and short-term speculation in equity markets. The stock market has become, in a meaningful structural sense, a vehicle for hedging options positions rather than the other way around.

For GEX analysis, this shift has a direct consequence: the more options activity there is relative to underlying equity activity, the larger the proportion of price movement explained by dealer hedging rather than by fundamental or technical equity flows. GEX signals are not just useful — they have become progressively more reliable as options volume has grown.

Approximate figures — options volume has grown ~150% vs ~30% for equity volume over the decade. Sources: OCC, Cboe, industry reports.

Counting options contracts, like counting stock shares, can be misleading because it treats all contracts as equivalent. A deep OTM put with delta of 0.02 generates almost no dealer hedging flow. An ATM call with delta of 0.50 forces the dealer to hold and continuously adjust a $57,000 (SPY) or $570,000 (SPX) position in the underlying for every contract outstanding.

Delta Notional is the correct measure of options market impact. It is calculated by multiplying each option's delta by the number of contracts and the notional value of the underlying per contract. Goldman Sachs research teams, among others, have highlighted delta notional as the preferred metric for measuring how much dealer hedging the options market actually generates on any given day.

When measured in delta notional terms, the options market's impact on equity price behavior is even more dramatic than the raw contract count suggests — because the growth in volume has been concentrated in near-ATM, short-dated options (especially 0DTE), which carry the highest delta per contract.

GEX levels work because dealer hedging is mechanical and large. The larger the aggregate options market relative to the underlying equity market, the greater the fraction of price movement that is driven by structured, predictable hedging flow rather than by sentiment or discretionary positioning.

In 2014, with daily options volume around 17 million contracts and equity volume at 7 billion shares, dealer hedging was a meaningful but not dominant force in price discovery. By 2024, with options volume nearly three times larger and 0DTE accounting for a substantial fraction of that, dealer hedging has become the single largest category of structural price flow on active sessions.

This does not mean GEX predicts every move. It means that the structural levels GEX identifies — Call Wall, Zero Gamma, Put Wall — have more dollar weight behind them than they did a decade ago. When a level acts, it acts more definitively. When it fails, the failure itself is often driven by a counter-flow large enough to show up in the GEX data as a regime shift.

• More options volume → larger dealer hedges → more visible structural price behavior at key GEX levels
• Higher 0DTE share → faster gamma → more acute intraday moves near ATM strikes at open and close
• More institutional short-dated hedging → more stable, persistent OI at near-term strikes → more reliable GEX signals week-over-week
• The options market is now large enough that understanding it is not optional for serious equity traders — dealer hedging flows are part of your price chart whether you track them or not