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The system of rating securities was originated by John Moody in 1909. The purpose of Moody’s rating.guide is to provide investors with a simple system of gradation by which future relative creditworthiness of securities may be gauged.
Rating Symbols
Gradations of creditworthiness are indicated by rating symbols, with each symbol representing a group in which the credit characteristics are broadly the same. There are nine symbols as shown below, from that used to designate least credit risk to that denoting greatest credit risk:
Moody’s appends numerical modifiers 1, 2, and 3 to each generic rating classification from Aa through Caa.
Where no rating has been assigned or where a rating has been withdrawn, it may be for reasons unrelated to the creditworthiness of the issue.
Should no rating be assigned, the reason may be one of the following:
1. An application was not received or accepted.
2. The issue or issuer belongs to a group of securities or entities that are not rated as a matter of policy.
3. There is a lack of essential data pertaining to the issue or issuer.
4. The issue was privately placed, in which case the rating is not published in Moody’s publications.
Withdrawal may occur if new and material circumstances arise, the effects of which preclude satisfactory analysis; if there is no longer available reasonable up-to-date data to permit a judgment to be formed; if a bond is called for redemption; or for other reasons.