Have you been paying attention to shares of Premier, Inc. (PINC) ? Shares have been on the move with the stock up 15.2% over the past month. The stock hit a new 52-week high of $23.56 in the previous session. Premier, Inc. has gained 3.6% since the start of the year compared to the 1% move for the Zacks Medical sector and the -6.1% return for the Zacks Medical Services industry.What's Driving the Outperformance?The stock has an impressive record of positive earnings surprises, as it hasn't missed our earnin ...