The S&P 100 (Standard and Poor's 100) is a stock market index of United States blue chip large-cap (and/or mega-cap) stocks maintained by S&P Dow Jones Indices. The S&P 100 is a subset of the S&P 500 and the S&P 1500, and holds stocks that tend to be the largest and most established companies in the S&P 500. However, the S&P 100 actually includes 101 larger US company stocks due to holding two different share classes of Alphabet Inc. Constituents of the S&P 100 are selected for sector balance an...