Insurance stocks have been on a roll, and an emerging leader in the industry is Hanover Insurance Group (THG). The stock is in buy range from the 83.38 buy point from which it broke out last month. The breakout came after the insurer beat expectations with a third-quarter profit of $1.61 a share, up 52% from the year-ago period. Revenue dipped 3% to $1.23 billion, breaking a long trend of single-digit increases.