Over recent years, the index has performed even better than usual, as it has rewarded the success of rapidly growing Big Tech companies. But the U.S. stock market’s concentration by market ...

We examine how elevated concentration levels have historically impacted returns, valuations, and long-term investor outcomes — and why today’s market dynamics may be setting the stage for a ...

While stock market concentration raises legitimate concerns, the historical performance of passive index funds compared to active management suggests that the issue may not be as dire as some fear.

"Stock market concentration – with a handful of mega-cap technology stocks driving index performance – has also contributed to volatility, as any weakness in these companies leads to outsized ...

What are implications of market concentration in developed vs ... Analyze the top five index stocks and leading country markets by weight. Evaluate the success of active funds in emerging markets.

A new exchange-traded fund is trying to combat that concentration risk ... As of the market close on March 31, the top-10 stocks in the S&P 500 index accounted for roughly 34% of the overall ...