Gamma hedging of 0DTE options: Managing extreme risk on expiration day

Over the past few years, zero-days-to-expiration (0DTE) options on US equity indices have moved from a niche product to a central component of daily market activity. These contracts, which expire on the same day they are traded, now account for an outsized portion of index option volume (over 61% in the S&P 500 (SPX) as of May 2025)_[1].

This white paper provides detailed insights into 0DTE options and how they have become indispensable tools for professional trading desks.  

Discover how professional trading desks utilize 0DTE options as part of their trading and risk management arsenal by focusing on: 

• Prioritizing delta and gamma risk parameters as the expiration days draws near.
• Continuous delta re-balancing which is a necessity on expiration day.
• Advanced hedging tools and techniques to monitor Greeks in real-time and execute hedges with minimal latency.

Explore methods for gamma hedging and rapid delta rebalancing to manage intraday exposure as options approach expiration. 

_{[1] Morningstar. Popular ‘zero-day’ options saw record share of trading volume in May as retail traders piled in. Jun 2, 2025}

_FAQ: 

1. Why is gamma risk so dangerous in 0DTE options trading?
Gamma risk in 0DTE options increases exponentially as expiration approaches, making delta highly unstable. According to Numerix, even small price movements can rapidly change exposure within minutes. This creates a situation where positions can shift from neutral to highly directional almost instantly. Without continuous hedging, this can lead to significant losses.

2. Why do small intraday moves create outsized risk in 0DTE strategies?
0DTE options are extremely sensitive to price changes because gamma is highest near expiration. According to Numerix, a ~1% market move can shift delta from approximately 0.50 to 0.95 or 0.05 within hours. This means positions can become heavily directional very quickly. Small moves that seem insignificant can have major P&L consequences.

3. Why can delta exposure become unstable within minutes in 0DTE trading?
Delta in 0DTE options changes rapidly because it is directly impacted by gamma, which spikes near expiration. According to Numerix, this can cause large swings in directional exposure in very short timeframes. As a result, positions require constant recalibration. Static hedging approaches are ineffective.

4. Why is manual hedging ineffective for managing 0DTE gamma risk?
Manual hedging cannot keep pace with the speed of intraday changes in delta and gamma. According to Numerix, effective hedging often requires execution in milliseconds. Human-driven processes introduce delays that create exposure gaps. These gaps can lead to immediate and material losses.

5. Why do traditional risk models fail to capture 0DTE exposure?
Traditional risk models are designed for longer-dated options with gradual changes in risk. In 0DTE trading, risk evolves nonlinearly and rapidly throughout the day. According to Numerix, these models underestimate the impact of gamma and intraday volatility. This leads to incorrect risk assessments and potential losses.

6. Why is real-time monitoring essential for 0DTE options trading?
Risk metrics such as delta and gamma can change multiple times per second in 0DTE markets. According to Numerix, real-time analytics systems are required to track these changes accurately. Without continuous monitoring, firms operate with outdated risk information. This increases the likelihood of mis-hedging.

7. Why do traders underestimate the speed of risk changes in 0DTE options?
Many traders apply intuition from longer-dated options, where risk evolves more gradually. In 0DTE trading, risk can change dramatically within minutes. According to Numerix, small oscillations can become make-or-break events. This mismatch leads to underestimation of exposure.

8. Why are firms at risk of sudden losses near market close in 0DTE trading?
Gamma risk peaks in the final hours before expiration, causing extreme sensitivity to price movements. According to Numerix, clearing firms may require positions to be closed shortly before market close due to this risk. This creates forced liquidation scenarios. These conditions amplify potential losses.