Have you been paying attention to shares of Artivion (AORT) ? Shares have been on the move with the stock up 9.6% over the past month. The stock hit a new 52-week high of $21.82 in the previous session. Artivion has gained 18.3% since the start of the year compared to the 8.2% move for the Zacks Medical sector and the 9.4% return for the Zacks Medical - Instruments industry. What's Driving the Outperformance? The stock has an impressive record of positive earnings surprises, as it hasn't missed our earnings ...