Understanding 0DTE Options and Their Market Impact

This report examines Schaeffers Research’s analysis of how 0DTE (zero-days-to-expiration) options can explain market movement, published on March 24, 2026. The article, featured on The Contrarian Edge Substack, draws an innovative analogy between March Madness bracket predictions and stock trading dynamics, suggesting that like bracket predictions, options market dynamics can help explain short-term market behavior [1].

The timing of this article coincides with notable market volatility during the week of March 18-24, 2026. The S&P 500 experienced a down day of approximately 1% on March 18 followed by recovery through the week. The NASDAQ showed particularly volatile sessions, including a -1.55% decline on March 20 followed by a strong rebound of +1.0% on March 19. The Russell 2000 demonstrated strong small-cap rally on March 24, posting a +1.42% gain. The VIX remained elevated throughout the period, indicating persistent market uncertainty [0].

Sector performance on March 24 revealed clear rotation patterns: Utilities led with +2.70%, followed by Basic Materials at +2.03% and Energy at +1.56%. Conversely, Communication Services lagged significantly at -1.29%, while Technology posted a modest +0.79% gain [0]. This sector divergence suggests investors may be repositioning in response to evolving risk perceptions.

Zero-days-to-expiration options are contracts that expire on the same day they are traded, with zero days remaining until expiration. Their growing popularity represents a significant market microstructure development that has transformed how markets move on a daily basis.

1. Expiration-Driven Trading Volume:
   0DTE options now account for a substantial portion of daily options volume, creating concentrated hedging and speculative activity that can move underlying markets [1].

2. Gamma Exposure and Market Maker Hedging:
   Market makers who sell 0DTE options must dynamically hedge their delta exposure as underlying prices move. This creates directional buying/selling pressure that can amplify intraday volatility—particularly during the final hours of trading when expiration approaches [1].

3. Gamma Walls at Key Strikes:
   Large concentrations of options at specific strike prices (particularly near-the-money) create “gamma walls” where market makers’ hedging flows can exacerbate price movements, potentially triggering self-reinforcing price dynamics [1].

4. End-of-Day Volatility Effects:
   With expiration occurring at market close, significant gamma hedging activity concentrates in the final hours of trading, potentially creating pronounced afternoon volatility spikes [1].

The Schaeffers Research article addresses a timely topic as 0DTE options have become a dominant force in options market microstructure. Unlike traditional options that allow time for positions to play out, 0DTE contracts offer zero days for incorrect directional bets to recover—incorrect bets result in total premium loss. This characteristic may encourage more aggressive positioning and contribute to the distinctive volatility patterns observed on expiration days.

The comparison to March Madness brackets is particularly apt: both involve predicting outcomes within a compressed timeframe where small differences in analysis can lead to dramatically different results. Just as bracket predictors must weigh multiple factors quickly, options traders must anticipate not only directional movement but also how hedging flows from options market makers will interact with that movement.

This analysis was constrained by the inability to retrieve the full article content due to an authentication error at the original URL. Consequently, specific 0DTE positioning data referenced in the Schaeffers article, current put/call ratios for SPY or other major indices, gamma exposure levels at key strikes, and the article’s specific observations about recent market moves could not be analyzed in detail [1].

Further investigation would benefit from current 0DTE volume as a percentage of total options volume, the largest concentrations of open interest at key strikes, market maker net gamma positioning, and comparison to previous periods of elevated 0DTE activity.

• Expiration Day Volatility:
  0DTE expiration days historically show heightened intraday volatility, particularly in the final hour of trading when gamma hedging activity peaks [1]
• Gamma Squeeze Potential:
  Large moves in underlying indices can trigger cascading hedging flows from options market makers, potentially amplifying moves beyond fundamentals warrant
• Rapid Premium Erosion:
  With zero days to expiration, incorrect directional bets result in total premium loss, potentially increasing aggressive and desperate positioning in final hours

• Regulatory scrutiny of 0DTE options has increased, with potential for future position limits that could alter market dynamics
• The cumulative effect of 0DTE trading on market microstructure remains debated among academics and practitioners, creating uncertainty about long-term market behavior

• Understanding 0DTE dynamics provides traders with insights into likely intraday volatility patterns, particularly around market close on expiration days
• Awareness of gamma walls at key strike prices can help anticipate potential support or resistance levels
• Monitoring VIX levels and term structure alongside 0DTE positioning data may provide actionable intelligence for timing entries and exits

• VIX levels and term structure as indicators of overall market uncertainty
• 0DTE put/call ratios at market open as directional sentiment indicators
• Concentration of open interest at major index strikes (e.g., SPX 6,600, 6,500)
• Federal Reserve communications and macro data releases coinciding with 0DTE expiration dates, which may interact with expiration-driven hedging flows

The Schaeffers Research article examining how 0DTE options can explain market movements addresses a significant development in options market microstructure. Current market conditions show elevated volatility with the S&P 500 experiencing a volatile week and clear sector rotation patterns [0].

0DTE options influence markets through several mechanisms: expiration-driven trading volume creates concentrated activity, gamma exposure forces market makers to dynamically hedge (amplifying moves), and gamma walls at key strikes can create self-reinforcing price movements. The final hour of trading on expiration days typically exhibits heightened volatility as hedging activity peaks.

Decision-makers should be aware that 0DTE dynamics contribute to intraday volatility spikes, accelerated moves in the final hour of trading on expiration days, and potential for self-reinforcing price movements as market makers hedge gamma exposure. Further investigation into current 0DTE positioning data and gamma exposure levels would provide more actionable intelligence for trading decisions around expiration days.