S&P 500 Market Concentration Nears All-Time High at 195 HHI Points
The Herfindahl-Hirschman Index shows U.S. equity market value increasingly concentrated among fewer companies, approaching record levels.
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Terms & Concepts
- Herfindahl-Hirschman Index (HHI): A statistical measure of market concentration, where higher values indicate more dominance by fewer companies.
- S&P 500: A major U.S. stock market index tracking the performance of 500 large-cap companies listed on U.S. exchanges.