5 companies now make up 18% of the S&P 500. Is that a recipe for a crash?
Microsoft, Apple, Google, Amazon and Facebook have collectively added $4.4 trillion in market cap gains since 2013.
Feb 11, 2020 ... ... Amazon and Facebook have collectively added $4.4 trillion in market cap
gains since 2013. ... Chart: Ben Carlson SOURCE: YCharts ...