Standard & Poor’s first introduced the S&P 500 back in 1923. The S&P 500 has evolved over generations and the S&P 500 in its present form began in 1957. It is said that where the market goes stocks follow. The S&P 500 is a measure of the general level of stock prices, and includes a variety of different types of stocks. This is why the S&P 500 and the S&P 500 companies more accurately portray a realistic snapshot of where the American stock markets are.

Committees at Standard & Poor’s choose the stocks within the S&P 500. While the S&P 500 includes a small amount of non-US corporations, the majority are US corporations.

There are many mutual funds, called index funds that track and try to mirror the results of the S&P 500. This is a relatively safe and well respected method of investing in the S&P 500. Certainly, if an investor had the wherewithal he or she could buy the individual stocks listed in the S&P 500, but this trading strategy is not practical for most investors. In addition, trading S&P 500 companies does not guarantee profits. The stock market and individual stocks will always rise and fall on the fundamentals of the individual company.

There are many formulas and methods used by Standard & Poor’s to ensure that the S&P 500 companies do not affect the volatility of the S&P 500. As a prevention measure for the value of the index, the S&P 500 have what is known as divisor adjustment.

To prevent the value of the Index from changing merely as a result of corporate financial actions, all such actions affecting the market value of the Index require a Divisor adjustment. Adjustments are made daily as to not affect while price movements or values in the S&P 500. This adds stability to the S&P 500 index and security for the traders who use the S&P 500 as a tool for investing.