NDX 1-Day ATM Straddle Mid-Year Performance Update

An analysis of 1-day at-the-money (ATM) NDX index option straddle performance reveals significant volatility and varying outcomes for buyers and sellers across 2023, 2024, and H1 2025. While 2023 saw losses for both sides, 2024 proved highly profitable for buyers (over 2400 points) and dramatically negative for sellers (over 3300 points). In H1 2025, sellers incurred substantial losses, primarily driven by April's tariff announcement which caused an 1850-point loss and coincided with straddle premiums averaging nearly 2% (over double the long-term average), while buyers accumulated over 870 points, largely from April. This underscores the event-driven nature and inherent risks of consistent short straddle positions in this relatively new market.

Analysis

An analysis of 1-day at-the-money (ATM) NDX index straddle performance from 2023 through H1 2025 reveals significant outcome asymmetry and highlights the inherent risks of systematic short volatility strategies. Performance has been highly inconsistent year-to-year; 2023 resulted in net losses for both buyers and sellers after accounting for trading costs, while 2024 saw a dramatic divergence with buyers profiting by over 2400 points and sellers incurring a substantial loss of 3,376.85 points. The first half of 2025 underscores the event-driven nature of this market, with a single macro event—a tariff announcement in April—causing a catastrophic 1850-point loss for sellers that month. Conversely, this same event was responsible for over 200% of the 870-point profit accumulated by straddle buyers in H1 2025. This volatility spike in April also drove straddle premiums to a record average of nearly 2% of the NDX value, more than double the long-term average of 0.93%. The subsequent months of May and June were profitable for sellers, possibly due to elevated premiums persisting even after the initial shock, as some sellers may have exited the market.

Key Decisions for Investors

• Investors engaged in selling 1-day NDX straddles must recognize the strategy's significant tail risk, where a single adverse event, like the April tariff announcement, can rapidly erase cumulative gains.
• Tactical buying of 1-day straddles has proven highly profitable during sharp, event-driven volatility spikes, suggesting that long volatility positions could be advantageous ahead of major economic announcements or geopolitical catalysts.
• Monitor straddle premium as a percentage of the NDX as a key risk indicator; premiums approaching 2% have coincided with extreme losses for sellers, whereas levels below the 0.93% long-term average have signaled more favorable environments for short volatility strategies.
• Consider that a sharp increase in losses for option sellers may lead to a temporary reduction in supply and inflated premiums, potentially creating attractive entry points for disciplined short-volatility traders in the subsequent periods of normalization.