Tech’s Influence Over Markets Eclipses Dot-Com Bubble Peak - The Wall Street Journal

Companies that do everything from manufacturing phones to operating social-media platforms now account for nearly 40% of the S&P 500, on pace to eclipse a record of 37% from 1999, according to a Dow Jones Market Data analysis of annual market-value data going back 30 years.

Apple Inc., which earlier this year became the first U.S....

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