The stock market is more top-heavy than it has been in decades. The collective market value of the top 10 companies in the S&P 500 has swelled to about $8 trillion as of Friday as investors have piled into big technology stocks including Apple Inc., Microsoft Corp. and Amazon.com Inc. Together, the 10 biggest firms comprise 29% of the...

Source: Wall Street Journal August 09, 2020 15:00 UTC