Corporate governance remains the focus of current research and a concept that continues to evolve to meet the needs of business managers. Faced with the need for companies to cope with a world characterized by perpetual change and successive economic crises (Prowse in Revue d'économie financière 31:119–158, 1994), the identification of the results of the implementation of good governance mechanisms in the structure of the management of companies on financial performance remains a necessity that helps managers and researchers specialized in management sciences and financial accounting to have a better visibility on the importance of corporate governance. It should be mentioned that the economic environment and the characteristics of the sectors of activity of the companies remain a relevant criterion in the study of the relation between the governance of the companies and their financial performance. In this sense, we have tried through this research work to study the impact of the implementation of effective corporate governance on the financial performance of 160 companies in the UK between 2005 and 2018 while taking into account the specificity of the business sectors. Through our study, we used multivariate regressions based on FGLS models while dividing our sample to several clusters. As a result, we found that the implementation of good corporate governance leads to the improvement of the financial performance of companies measured by the return on equity. As a motivation, it must be said that this study can be of major importance for future studies that want to make comparisons on the sectoral and temporal level. Indeed, this study gives the possibility for future research work to make comparative studies based on comparisons for different sectors of activity in the UK before and after the Brexit and also after the COVID 19 period.

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