S&P 100 companies list

The S&P 100 is a stock market index of 100 of the largest, most established U.S. companies, maintained by S&P Dow Jones Indices. It is a subset of the S&P 500: every S&P 100 company is also in the S&P 500. Options on the index trade under the ticker OEX, which is why the index is often called by that name.

The S&P 100 has 100 companies but 101 stocks, because Alphabet is included with both of its share classes (GOOGL and GOOG).

The S&P 500 holds 503 stocks covering roughly 80% of U.S. equity market capitalization. The S&P 100 is the mega-cap slice of it: 101 stocks picked from the S&P 500 for size and sector balance. Because the largest companies dominate both indices, the two move very closely together.

Rarely. Changes are usually announced alongside the quarterly S&P 500 rebalance in March, June, September and December, or when a member is acquired or drops out of the S&P 500. A company removed from the S&P 500 leaves the S&P 100 at the same time.

Information Technology (24), Financials (15), Health Care (15) are the three largest sectors by number of constituents.