Everyone had high hopes for Marissa Mayer when she was became the CEO of Yahoo a few years back, but not only is the company still losing market share to the likes of Facebook and Google, it’s losing executives as well. The latest executive to abandon Yahoo is Jacqueline Reses, the company’s former chief development officer who recently left, and has joined up with Square’s executive team, which happens to come at a time when the startup is preparing to go public.