Risk management involves awareness toward risks, predicting them and minimizing losses or transforming them into an opportunity. Its instruments that emerged with the improvement of the financial system are looming large every passing day. For corporate purposes, risk management, as well as risk measurement, is a useful and essential issue. The research aims to make a comparative analysis of the risk structures of the MIST countries (Mexico, Indonesia, South Korea, and Turkey) and the US indexes (S&P 500) in terms of risk concepts. In this study, the risks of the national stock market indexes of the MIST (Mexico, Indonesia, South Korea, and Turkey) countries are measured using the monthly closing data for the 2010-2021 period, based on the US markets. The S&P 500 index is determined as the market index. Thus, the total risks of the securities market indexes of MIST countries are estimated and categorized as unsystematic and systematic. Moreover, beta coefficients indicating sensitivity to fluctuations in the market are estimated by using the 144-month data. Findings: It is indicated that the unsystematic risks of the securities markets in the MIST country group on the basis of index are, in general, quite low, and the systematic risk factor constitutes the majority of the risk