This is an index developed by the Chicago Board Options Exchange and also is a heavily traded option representing the S&P 500 index options (SPX). CBOE looks at the performance of near-term SPX options expirations and projects what that means 30 days in the future. Generally it’s used as a sign of a stock’s or the broad stock market’s volatility. The higher the number, the higher the volatility. The current CBOE was 20.13 as of December 20, 2024.
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