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•87% Informative
The 10 largest U.S. companies accounted for 14% of the S&P 500 stock index a decade ago .
Today , they account for more than a third of the index.
Tech-stock euphoria has helped drive higher concentration at the top, particularly among the Magnificent 7.
Some experts fear such concentration may put investors at risk, but others think it's not a big deal.
Present-day market leaders "generally have higher profit margins and returns on equity" than those in 2000 , Goldman Sachs Research report says.
Concentration would be a problem for investors if the largest companies had related businesses that could be negatively impacted simultaneously.
A well-diversified equity portfolio will include the stock of large companies (like those in the S&P 500).
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