This study examines the relationship between corporate governance ratings and firm performance, includingboth a global measure of corporate governance and four sub-indices corresponding Audit, Board Structure,Shareholder Rights and Compensation, provided by Institutional Shareholder Services (ISS). The corporategovernance ratings represent a proper approximation of the quality of corporate governance practices from insidethe companies. This fact determines the investors which seek to hold shares in certain companies for a long termto be interested in the quality of corporate governance practices related to those companies. Using thecross-sectional multiple linear regression model for a random sample of 155 U.S. companies listed at New YorkStock Exchange, NASDAQ and NYSE Amex Equities, belonging to twenty industries, in 2011, our researchemphasizes a negative relationship between corporate governance global rating and firm performance. Also, wefind a negative relationship between corporate governance sub-indices and firm performance, with someexceptions. However, when we removed the companies from financial and real estate sectors, respectively 29companies, resulting another sample of 126 companies, the results support the same findings. This study revealsthat the commercial corporate governance ratings, like Governance Risk Indicators (GRId), provided byInstitutional Shareholder Services (ISS) are affected by measurement errors. This research is important to theshareholders and investors globally, who are using commercial corporate governance ratings, in order to identifyand quantify the risks of their investments. Our study suggests that shareholders and investors should not baseentirely on commercial corporate governance ratings in their investment decisions, because they couldn’t takethe proper investment decision each time.
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