In the past year $SPY, $QQQ, $AAPL, $MSFT, $AAPL, $AMZN, $FB all move positive/negative on the same day 118 times out of 252 days.  All but one moved in the same direction 66 out of 252 days.  All but two, 44 out of 252 days.  Only 24 days did 3/4 move out of sync.