As CEOs know, it is indeed lonely at the top. CEOs carry the the mental weight of their organizations through the inevitable ups and downs of business cycles and are ultimately held accountable for the success or failure of their companies. CEO peer advisory groups are one type of executive coaching that allows CEOs to receive advice from fellow CEOs on key business topics while acting as a forum to voice challenges they face in their roles. In our experience leading CEO groups, 5 reasons stand out above the rest for joining a CEO peer group.