Market cap: $632 billion Year-to-date performance: up 8.5%Market cap: $931 billion Year-to-date performance: up 1.7%Market cap: $1 trillion Year-to-date performance: up 8.6%Market cap: $1.27 trillion Year-to-date performance: up 5.4%Market cap: $1.38 trillion Year-to-date performance: up 8.1% Now read more markets coverage from Markets Insider and Business Insider: Stocks are the most expensive since the 1980s based on one critical metric US consumer confidence hits highest level since 2000 The world's most accurate economic forecaster 8 years running told us why Trump's Phase One trade deal is not nearly enough to prevent a looming US slowdown