The S&P 500 rose 3.3 percent between Friday, September 21, and Friday, September 28. It was the biggest weekly gain since the end of June 29 – July 2.
The biggest decliner in the S&P 500 today, for instance, was Mylan (MYL). Disappointing results, manufacturing problems and weak demand hammered the drug maker 24 percent. That was its worst decline in at least a decade