The S&P 500 Is Getting More Concentrated 📈

What We're Showing

The share of the top 10 stocks in the S&P 500's total market capitalization over time, from 1880 to 2024.

The data comes from Finaeon, S&P500, and Citi Global Insights.

Key Takeaways

• The top 10 stocks of the S&P 500 have made up an average about one-quarter (24%) of the index from 1880 to 2010.
• Between 2010 to 2024, their share of the S&P 500's market cap doubled from 19% to 38%.
• As of early 2025, the top 10 stocks of the S&P 500 are mostly tech companies, including Apple, Microsoft, Nvidia, Amazon, Alphabet, Meta, Tesla, and Broadcom.