Top 10 Stocks in the S&P 500: Doubling Their Market Share

In December 2024, the top 10 stocks in the S&P 500 accounted for 39% of the index's total market capitalization, doubling their share compared to the 2010–2014 period. From 2018 to December 2024, these top 10 stocks contributed approximately 50% of the overall market cap growth in the S&P 500. This trend underscores the increasing concentration of market value among a small group of dominant companies. Furthermore, between 2014 and December 2024, the market capitalization of the top 10 stocks grew near 3 times faster than that of the remaining stocks in the S&P 500, highlighting the growing influence of these leading firms in the U.S. stock market.