With buyback help, Yahoo stock has soared under Mayer

By Rodrigo CamposNEW YORK (Reuters) – Investors who made early bets on Marissa Mayer’s ability to turn around Yahoo Inc were well rewarded for their faith: the share price has more than doubled and widely outperformed the broader stock market since she took over as president and CEO in July 2012. But those still betting on her may have lingered too long as the stock nearly halved from November 2014 to last September. Much of the long upward trajectory was funded by an aggressive shar