Not financial advice - but here are some quick thoughts.
Apple is the top holding for many institutions; and looking at the movement now, my sensing is that big players are unloading some shares in anticipation of a poor earnings call.
To be more specific, the revenue of Apple could come in okay / decent, but forecast could be weak. And this may be deemed by investors that the economy ahead is going to be very weak.
But of course, the above can be invalidated if 1) Apple gives...