Shares of AllianceBernstein (AB) have been strong performers lately, with the stock up 2.9% over the past month. The stock hit a new 52-week high of $35.83 in the previous session. AllianceBernstein has gained 13.4% since the start of the year compared to the 17.6% move for the Zacks Finance sector and the 26% return for the Zacks Financial - Investment Management industry.What's Driving the Outperformance?The stock has a great record of positive earnings surprises, as it hasn't missed our earnings consens ...