How a Small Minority of Companies Drove the Majority of S&P 500 Growth Over the Last 50 Years
When people talk about investing in the S&P 500, it’s often described as a way to capture the broad performance of the U.S. stock market. After all, the index represents 500 of the largest publicly traded companies in the United States. But over the past five decades, research shows that a surprisingly small minority of these companies have driven the majority of the S&P 500’s growth, highlighting the unequal nature of stock market returns.