5 companies now make up 20% of the S&P 500. Here's why Goldman Sachs says that's a bad signal for future market returns. (MSFT, AAPL, AMZN, GOOGL, FB)

5 companies now make up 20% of the S&P 500. Here's why Goldman Sachs says that's a bad signal for future market returns. (MSFT, AAPL, AMZN, GOOGL, FB)

Business Insider

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· *The stock market has been propped up by a handful of mega-cap companies leading into the outb**reak of the coronavirus pandemic.*
· *The five largest stocks now account for 20% of the S&P 500 market cap, which exceeds the 18% concentration level reached during the dot-com bubble.*
· *Historically, such narrow breadth is a...

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