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Zero-day options, or options that expire within the same trading day, have emerged as a major trend in the trading landscape. These options allow traders to capitalize on short-term market movements due to the daily expiration cycle introduced in recent years. For example, the SPX product, known for its daily expiring options, has seen such a significant increase in volume that it accounts for nearly half of its overall activity, equating to about 1.5 million contracts a day. This surge reflects a shift in trading strategies; traders are increasingly leveraging zero-day options for quick, tactical positions rather than traditional longer-term strategies.