ResearchBenchmarksConcentration Measurement on S&P 500 top-20 by market cap 2015–2024Follow43.2Concentration ValueGini7.413616.704325.99535.2857Mar 23, 2026Evaluation ResultsMethodMethodLinksConcentration ValueGini2026.0343.2NCI2026.0319.39HHI2026.038.79