Tag Archives: S&P 500 Equal Weight Information Technology
Concentrating on Technology
After the dominant performance of large-cap technology stocks in 2020, concentration concerns naturally come to mind. The HHI, or Herfindahl-Hirschman Index, is a widely-used concentration measure; it’s defined as the sum of the squared index constituents’ percentage weights (usually taken as whole numbers). For example, the HHI for an equally-weighted 50 stock portfolio is 200…