The purpose of this use is to reveal the variables that affect the financial performance of banks operating in Borsa Istanbul with an econometric model. For this purpose, quarterly data of 12 energy companies operating in the banking sector in Borsa Istanbul, the measure of which are 2005Q1 – 2021Q4, were gathered and panel data were collected. They are 2 model institutions that enable banks to reveal their working capital leverage values ​​and net interest incomes between their financial performances. While return on assets is the dependent variable of Model 1, the main independent variables are working capital leverage ratios and net interest returns. While return on equity is the dependent variable of Model 2, the main independent variables are working capital leverage ratios and net interest returns. With the obtained business, it has been concluded that the variables of estimating the return on assets and return on equity of the banks and the positive perspective variables in both models are net interest returns. No transactional relationship was found on the return on assets and equity of working capital and financial leverage.