There is a new acronym we need to be aware of, 0DTE, so new, it doesn’t have a hastag yet. It stands for 0 (zero) Days to Expiration options. Rolled out las year, they are options that expire within 24 hours. Why are they important? Because it appears they account for almost half of the trading volume on indices, particularly the S&P500 index. They have become more important than longer term options (23-36 days to expiration) used to calculate the VIX index. And they might be the reason why you see more volatile intra day sessions, with big swings.
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