The diagram below shows which codes the rating agencies use for creditworthy (investment grade) issuers and for non-creditworthy (non-investment grade bonds or high yield or junk bonds) issuers.
Sufficient quality to invest in
Excellent credit rating | Moody’s: Aaa Fitch: AAA Standard & Poor’s: AAA |
Very high credit rating | Moody’s: Aa Fitch: AA Standard & Poor’s: AA |
Good credit rating. Can deteriorate in bad economic situations. | Moody’s: A Fitch: A Standard & Poor’s: A |
Sufficient credit rating. Long-term quality will deteriorate in bad economic situations. | Moody’s: Baa Fitch: BBB Standard & Poor’s: BBB |
Insufficient quality to invest in
Insufficient quality to invest in. At best, these require better than expected economic situations (Ba/BB) to be able to pay in the long term and at worst (D), are bankrupt. | Moody’s: Ba, B, Caa, Ca, C Fitch: BB, B, CCC, CC, C, D Standard & Poor’s: BB, B, CCC, CC, C, D |