SUMMARY
Mobile telecommunications markets across the world are characterized by a modest number of suppliers and a large number of subscribers. Nevertheless, the degree of market concentration varies from country to country. The purpose of this paper is to establish a methodological framework for measuring and analysing market concentration in the mobile telecommunications market in Serbia. The degree of market concentration is calculated using the annual data for the period 2009-2014. The research is made by applying a set of statistical-mathematical methods for measuring market concentration, comparative analysis and descriptive statistics. The analysis finds that mobile telecommunications market in Serbia is highly concentrated and that the degree of concentration exceeds the average of European Union member states. The study is useful to Serbian authorities such as Commission for the Protection of Competition and Regulatory Agency for Electronic Communications and Postal Services, providing significant findings of structural features of the mobile telecommunications market in Serbia.