Led by Four Trillion Dollar Companies, the Market Caps of Public Stocks Are Highly Concentrated
The public stock markets are highly concentrated in the top 500 companies both in terms of market capitalization and earnings. This post looks at those concentrations and at the declining number of public companies. We also discuss the S&P 500 Index and the Russell 2000 Index to see how the largest public companies have fared relative to small cap stocks since the markets recognized the COVID-19 Pandemic.