The definition of the publicly held joint stock company has been changed by the virtue of the Article 16/3 of the Capital Market Law which is amended by Article 109 of the Law No. 7061, dated 28 Novem-ber 2017. Thereby, the scope of the joint stock companies that are re-garded as publicly held due to the number of its shareholders is expan-ded to joint stock companies, in which the majority of the shares are owned by the cooperatives and cooperative associations which have more than five hundred shareholders. When the law amendment has been passed for a year ago, SerPK m. 16 once again changed by the Article 8 of the Law No. 7159, dated 27 December 2018. Besides, Communiqué No. II-16.2 on the Principles Regarding the Joint Stock Companies in Which Majority of the Shares Are Owned by Cooperatives and Cooperative Associations has been published in the Official Gazette dated 19 September 2018, and entered into force on 19 October 2018. The Communiqué No. II-16.2.a was published in the Offi-cial Gazette dated 25.01.2019 and numbered 30666 for the purpose of ensuring compliance with the secondary regulation after the amendment made to the Law No 7159. In our study, it is aimed to explain and evalu-ate the provision of law relating to the subject matter and the secondary regulation issued accordingly.