Top 10 S&P 500 Companies by Market Cap (1980-2020)

Top 10 S&P 500 Companies (1980-2020) by market capitalization. Facebook, Microsoft, Amazon, Apple and Google make up 20-25% of the S&P 500. Paradigm shift? or asset bubble? The S&P 500 index consists of most of the largest companies in the United States. The S&P market cap is 70 to 80% of the total US stock market capitalization. It is a commonly used benchmark for stock portfolio performance in America and abroad. Beating the performance of the S&P with less risk is the goal of nearly every portfolio manager, hedge fund and private investor. S&P 500 Annualized Returns as of 6/23/20: % Source: Years 1980-2013: #2013 Years 2014 - 2019: Year 2020: Manually calculated as of 6/22/2020