$SPX $SPY  David Kostin @ GSachs mentioned a couple of market stats to  @CarlQuintanilla.  1. 45% of the NASDAQ  YTD gains are attributable to five stocks  $FB $AMZN $AAPL $GOOGL, and I believe the 5th has to be $MSFT even t... https://t.co/uqHugRf9ud