Exxon Mobil was upgraded by Bank of America Merrill Lynch and the raised price target caused stocks to get a lift in the morning session. However, the boost did not last long and stocks began to give back those gains. Ben Willis of Albert Fried notes many stocks being sold are ones with high margin requirements. Willis mostly sees a sector rotation happening out of the names and going into lower beta names. He also points out the biotech weakness at NASDAQ.