This paper evaluates the financial performance of the Egyptian companies included in the Egyptian sustainability index (S&P/EGX ESG index), over the period 2010-2023. Environmental, social and governance (ESG) rating is measured in this study by three different methods. Both panel data and cross-sectional data regression models are employed, using modern as well as conventional financial performance metrics. Tobin's Q ratio, and Economic value added (EVA) are the modern performance metrics used in this study. The results support the superior performance of companies included in the Egyptian sustainability index, compared to other counterparts excluded from this index. However, there is no strong evidence supports the positive relationship between ESG ratings and financial performance. The results are validated by using univariate analyses. In addition to repeating the study after excluding financial sector. The findings of this research is expected to benefit prospected investors, portfolio managers, and policy makers.