Nike Inc (NYSE:NKE) stock is up 5.5% at $85.42 at last glance, after news that CEO John Donahoe is retiring in October and will be replaced by former executive Elliott Hill, who is coming out of retirement for the role after working 32 years at the company. Donahoe's stint at the helm has been rocky, and investors are optimistic about the change. The stock has yet to recover from June 28, when it dropped 22.4% for its worst day ever after mixed earnings results and a guidance warning. Still, today's pop has ...