Have you been paying attention to shares of Sprouts Farmers (SFM) ? Shares have been on the move with the stock up 15.6% over the past month. The stock hit a new 52-week high of $103.8 in the previous session. Sprouts Farmers has gained 99.3% since the start of the year compared to the 11.3% move for the Zacks Retail-Wholesale sector and the 29% return for the Zacks Food - Natural Foods Products industry.What's Driving the Outperformance?The stock has an impressive record of positive earnings surprises, as ...