David Paul Morris/Bloomberg via Getty ImagesThe U.S. stock market has become dominated by about a handful of companies in recent years. Some experts question whether that "concentrated" market puts investors at risk, though others think such fears are likely overblown. The so-called "Magnificent Seven" — Apple , Amazon , Alphabet , Meta , Microsoft , Nvidia and Tesla — make up about 31% of the index, it said. Why stock concentration may not be a concernThe S&P 500 tracks stock prices of the 500 largest publicly traded companies. When there were big market crashes, they generally don't appear to have been associated with stock concentration, he added.

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