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Moody's and S&P Ratings: Are They Equivalent? Conservative Ratings and Split Rated Bond Yields

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We examine the relative impact of Moody's and S&P ratings on bond yields and find that at issuance, yields on split rated bonds with superior Moody's ratings are about 8 basis points lower than yields on split rated bonds with superior S&P ratings. This suggests that investors differentiate between the two ratings and assign more weight to the ratings from Moody’s, the more conservative rating agency. Moody's becomes more conservative after 1998 and the impact of a superior Moody's rating becomes stronger. Furthermore, the differential impact of the two ratings is more pronounced for the more opaque Rule 144A issues.
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Keywords: G12; G14; G21; G24; G28; bond ratings; bond yields; reputation capital

Document Type: Research Article

Affiliations: 1: Miles Livingston is a Professor of Finance at the University of Florida, Gainesville, FL, and a Visiting Professor at the Rotterdam School of Management, Erasmus University (: )., Email: [email protected] 2: Jie (Diana) Wei is a Financial Economist at the Office of the Comptroller of the Currency, Washington, DC (: )., Email: [email protected] 3: Lei Zhou is an Assistant Professor of Finance at Northern Illinois University, College of Business, DeKalb, IL (: )., Email: [email protected]

Publication date: 2010-10-01

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