This research investigates whether the TOPSIS method, which is a multiple decision-making method, can help in compiling many financial data owned by the decision-makers in businesses during the decision-making process and in presenting such data in scores. After presenting the theoretical framework of the method, an investigation of the literature about the research was conducted. Two practices were conducted in order to test the financial applicability of the method. In the first practice, various financial values of the Production Industry companies traded on BIST-100 were utilised, the obtained TOPSIS scores were compared to the market perfor- mances of the businesses. In the second practice, the method was analysed based on the data of the banks traded in Istanbul Stock Exchange in order to analyse how the method worked in the companies in the same sector. Whether the scores obtained are in line with the indicators of the financial performance will provide an insight about the method.