This study examines the information content of Standard & Poor's common stock ranking changes. Since prior studies find Standard & Poor's common stock rankings provide investors with a measure of risk, a ranking change may signify a change in risk. Common stock ranking changes made by Standard &...

This paper examines stock price reactions to changes in Standard & Poor's common stock rankings. Using internal memoranda obtained directly from Standard & Poor's, an event study methodology, and a sample of 191 upgrades and 582 downgrades, we find that the majority of stock price reactions...