The market for ultra short-term (zero days-to-expiry or 0DTE) options has grown exponentially over the last few years. In 2023, daily volume in 0DTEs reached over 45% of overall daily options volume. After briefly describing this exploding new market, we present a novel pricing formula designed...

A novel closed-form pricing formula for short-maturity options is employed to jointly identifyequity characteristics (spot volatility, spot leverage, and spot volatility of volatility) which havebeen the focus of large, but separate, strands of the literature. Interpreting equity as a call...