The growing demand for sustainable business practices and responsible corporate governance has fostered the integration of environmental, social, and governance (ESG) factors into corporate strategies. This study aims to analyze the quantitative relationship between companies’ ESG performance and their financial results, with a particular focus on revenue, net profit, return on equity (ROE), and share price. The study uses Spearman correlation analysis based on data from the Corporate Knights Global 100 rankings and financial reports over a three-year period (2022–2024), covering nine companies from three strategically important European sectors: renewable energy, industrial automation, and telecommunications. The results indicate a moderate and statistically significant positive correlation between ESG ratings and revenue (rho = 0.438, p = 0.022). However, no significant correlation was found with other financial indicators such as ROE or share price, suggesting that the impact of ESG may manifest indirectly or over the long term. It can be concluded that companies with higher ESG performance tend to achieve stronger revenue outcomes, particularly in sectors where sustainability and reputation are key competitive advantages. However, the influence of ESG on profitability and market value may be limited in the short term or dependent on external factors, including industry specifics and the macroeconomic environment. Recommendations for future research include: (1) expanding the sample size and time frame; (2) analyzing the separate impact of ESG subcategories (environmental, social, governance); and (3) applying regression models with control variables to more precisely evaluate the strength and direction of ESG influence.