Have you been paying attention to shares of Vertex (VERX) ? Shares have been on the move with the stock up 28.9% over the past month. The stock hit a new 52-week high of $55.52 in the previous session. Vertex has gained 104.7% since the start of the year compared to the 29.2% move for the Zacks Computer and Technology sector and the 34.2% return for the Zacks Internet - Software industry.What's Driving the Outperformance?The stock has an impressive record of positive earnings surprises, as it hasn't missed ...