Look out below? Tech giants hit hardest by profit-taking Mon.:  $CRWD -9.0% $SQ -6.3 $CRM -5.3 $ADBE -5.1 $SNAP -4.9 $TWTR -4.5 $NFLX -4.2 $NVDA -4.1 $AMD -4.1 $EA -3.9 $PYPL -3.9 $MSFT -3.1 $TSLA -3.1 $AMZN -3.0  Nasdaq -2.1%