Twitter shares reverse course after two firms made bullish calls on the stock, based on fundamentals and a potential upside for the stock.
PPG Industries shares fell sharply after the company warned it expects to post a third-quarter loss.
Homebuilders tumble on weak housing data, slower growth from Lennar
Apple shares rallied more than 3 percent as the company's new iPhone 7 launch in stores Friday.
Apple shares briefly surge more than 4 percent to their highest levels in nine months as the iPhone 7 cycle begins.
Diamond Offshore shares fall sharply after it reported a drilling contract was terminated prematurely by Petrobras.
Caterpillar shares fell after the company's latest retail machine sales report showed a sharp decline.