The subject of article is weak and strong corporate governance practices of companies which are publicly traded on ISE Corporate Governance Index and rated by authorized corporations -to do corporate governance compliance rating- based on The Corporate Governance Guide of Capital Markets Board (CMB) in Turkey. As a result of examining the Rating Reports, the most powerful corporate governance practices are observed at the “stakeholders” section of the guide and the weakest corporate governance practices at the “board of directors” section of the guide. However, principles that need some improvements in order to ensure perfect compliance to corporate governance principles are observed at all the sections of the guide. Those common corporate governance principles which appear in most of the corporate governance rating reports and need to be improved are explained in article.