Biotech company Biogen lowered its full-year profit forecast, citing higher costs related to its purchase of drug maker Reata Pharmaceuticals as well as the launch of its Alzheimer's drug.
Google's head of search testified at the company's trial Thursday as it started presenting its defense. The Justice Department in several states alleged that Google violated antitrust law to achieve its dominance in search.
Stocks were mixed in Friday's opening session as the Nasdaq sought to recover after a rough week and following Amazon's earnings, which topped expectations.