The winners-take-all effect of concentrated markets has reshaped the profile of global equity markets. At the end of 2025, the Magnificent Seven’s weight in the Morningstar Global Target Market ...

Over the last decade, the 10 largest stocks in the Russell 1000 Growth Index rose to dizzying heights to dominate the market. Market concentration rewarded passive investors who held market weights in ...

U.S. equity market concentration has increased sharply over the past decade as mega-cap companies have grown faster than the broader large cap universe. Measures such as the effective number of stocks ...