{
  "id": 2571322,
  "title": "Gamma, dealer hedging, and the 0DTE effect on market dynamics",
  "url": "https://urgent.news/2026/08/22/gamma-dealer-hedging-and-the-0dte-effect-on-market-dynamics",
  "topic": "finance",
  "section": "Finance & Markets",
  "published": "2026-08-22T11:45:15.000Z",
  "source": {
    "name": "Investing.com",
    "slug": "investing-com",
    "url": "https://www.investing.com/news/stock-market-news/gamma-dealer-hedging-and-the-0dte-effect-on-market-dynamics-93CH-4872338"
  },
  "original_language": "en",
  "account": "Gamma, dealer hedging, and the 0DTE effect on market dynamics are interrelated factors that can significantly influence market movements. Gamma measures how quickly an option’s delta changes as the underlying asset’s price fluctuates, while delta gauges the change in an option’s price for every $1 move in the underlying. High-gamma options are particularly sensitive to price changes, causing dealers to constantly adjust their hedging strategies. Dealers, unlike individual investors, don’t speculate but hedge their delta exposure by trading the underlying futures contract. This creates a feedback loop driven by price changes, not fundamentals. When dealers are short gamma, meaning they are net sellers of options, their hedging activities can amplify market moves, creating a self-reinforcing effect. Conversely, when dealers are long gamma, they tend to suppress volatility, leading to range-bound markets where prices hover around high open-interest strike prices at expiration. Zero-days-to-expiration (0DTE) options, expiring on the same day they’re traded, have become a dominant market force, accounting for over 40-50% of daily options volume on major indices like the S&P 500. On expiration day, gamma reaches its maximum, causing even small price moves to dramatically alter an option’s delta. This constant rehedging by dealers injects liquidity and can drive intraday price action, particularly in the final hours before expiration. A phenomenon known as a gamma squeeze occurs when heavy, directional call buying, especially at out-of-the-money strikes, leads to a rapid, parabolic price move driven by hedging math rather than conviction. Additionally, dealers can act as a volatility shock absorber when long gamma, especially when the market is buying puts for protection. This can create a sense of stability even when macro uncertainty is high. The shift between these two regimes – from gamma-long to gamma-short – is a critical threshold for sophisticated options traders. Understanding gamma, dealers' hedging strategies, and the impact of 0DTE options is essential for navigating modern market dynamics.",
  "summary": null,
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}