Quotes from the news wire:
The focus is going to continue to be on earnings and what the message is and so far the message hasn't been that great, if they continue to be what they are, these kind of lackluster reports, the market is going to get exhausted and it is going to back off. It is going to be an important week just for direction.
There is nothing really to drive sentiment one way or the other that is going to change people's perceptions on anything at the moment so therefore you are just getting this churning back and forth, once we made that new high the other day, the market just backed off and now it is just churning until tomorrow.
That is very specific to Gilead, so that one is getting crushed, but it shouldn't necessarily set a completely negative tone over the rest of the market, there is no reason for it, the market has had a decent move the last couple of days, so anything could cause people to take a little money off the table.