ABSTRACT: This study aimed to investigate the extent of corporate governance principles in the public shareholding companies listed on the First Market in Amman Stock Exchange .To achieve the objective of this study , the researchers distributed 55 questionnaires to first market companies in Amman Stock Exchange, The results showed that there is a strong application of corporate governance principles in the public shareholding companies listed in the First Market in the Amman Stock Exchange .Moreover there is a declination in staff awareness of public shareholding companies listed in the First Market in the Amman Stock Exchange , the importance of corporate governance and its principles .In addition, there is also a declination related to hide some information to shareholders , whether financial or non-financial , and a declination of disclosing strengths and weaknesses points , either in company’s financial system or its disclosures annual reports management in the, and a decrease in