S&amp;P 500 Swings From Gains to Losses as Tech Giants Tumble @themotleyfool #stocks $AAPL $^SPX $BAC $C $MSFT $JPM $GOOGL $AMZN $^COMP $WFC $PEP $FB $DAL $WYNN $MGM $LVS $MXIM $NVR $GOOG https://t.co/Emnv6buBCJ