The establishment, organization, termination and status changes of commercial companies in the Croatian legal system are governed by the Law on Commercial Companies. Accordingly, this law also regulates the bodies or organs that trading companies must or can have. The structure of the mandatory bodies of a joint-stock company is extremely important for the management of the joint-stock company, that is, for the management and supervision of the management of the business of the joint-stock company. Although as part of the adaptation of Croatian legislation to the legal acquis of the European Union, the 2007 amendment to the Companies Act introduced a monistic model of joint-stock company management into Croatian company law, the vast majority of joint-stock companies in the Republic of Croatia still retain a dualistic management model. The essential feature of this management model is reflected in the strict separation of the function of managing the company's affairs from the function of supervising that management, which in terms of the structure of the mandatory bodies of the joint-stock company in the dualistic management model means that in addition to the general assembly, joint-stock companies also have a management board and a supervisory board. Management of the affairs of a joint-stock company in a dualistic management system is the responsibility of the board, while the supervision of this management is the responsibility of the supervisory board. After this paper initially presents the basic theoretical assumptions of the dualistic model of management with legally prescribed mandatory bodies of joint-stock companies, and the continuation of the work, on the selected example of a joint-stock company, deals with the structure and practical functioning of the mandatory bodies of a joint-stock company which, by its statute, opted for a dualistic model of management.