@JC888:Honestly, quite unsure how to approach this topic without begining too technical. As I have never done anything like this, have to start from the beginning. { Please take a look at first image file. Table depicts how I arrived at my final argument }. Definition : S&P 500 stock market index comprises 503 stocks (companies) traded on US stock exchanges. The 503 stocks could be categorized into 11 Sectors. They are : - Communication Services - Consumer Discretionary - Consumer Staples - Energy - Financials - Health Care - Industrials - Information Technology - Materials - Real Estate - Utilities No of Coys : Number of stocks in each Sector that is part of 503 companies. No of Coy (50% Indx) : Number of stocks in each Sector that constitute Top 50% of the Index, based on a stock's market