TheStandard and Poor's 100, or simply theS&P 100, is astock market index of United States stocks maintained byStandard & Poor's.

The S&P 100 is a subset of theS&P 500 and theS&P 1500, and holds stocks that tend to be the largest and most established companies in the S&P 500.^[1] However, the S&P 100 actually includes 101 larger US company stocks due to holding two different share classes ofAlphabet Inc.

Constituents of the S&P 100 are selected for sector balance and represent nearly 71% of the market capitalization of the S&P 500 and 61% of the market capitalization of the U.S. equity markets as of December 2024.

Index options on the S&P 100 are traded with the ticker symbol "OEX". Because of the popularity of these options, investors often refer to the index by its ticker symbol.

In 1983, the CBOE created the first index options, based on its own index, the CBOE 100.

In 1993, CBOE created the Chicago Board Options Exchange Market Volatility Index (VIX), which was computed based on the price of S&P 100 options (at the time these were by far the most heavily traded index options). Then in 2003, they changed it to be based on the S&P 500.

Reference:^[6]

(as of March 24, 2025^[update][7])

The meanfree float market capitalization of the S&P 100 is over 3 times that of the S&P 500 ($135 bn vs $40 bn as of January 2017); as such, it is larger than a large-cap index. The "sigma" of companies within the S&P 100 is typically less than that of the S&P 500 and thus the correspondingvolatility of the S&P 100 is lower. However, the correlation between the two indices is very high.^[8]

This index is tracked by the exchange-traded fundiShares S&P 100 Index (NYSE Arca: OEF).

The following table shows the price return of the S&P 100 since 1975:^[9]

• S&P Global 100
• Russell Top 50 Index

• Standard & Poor's page on S&P 100 index
• Yahoo! Finance page for ^OEX

• 1983 introductions
• American stock market indices
• S&P Dow Jones Indices

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• Articles containing potentially dated statements from March 2025
• All articles containing potentially dated statements