Comparison of credit ratings from Moody’s, Standard & Poor’s and Fitch.

Moody's S&P / Fitch
Aaa AAA
Aa1 AA+
Aa2 AA
Aa3 AA-
A1 A+
A2 A
A3 A-
Baa1 BBB+
Baa2 BBB
Baa3 BBB-
non-investment grade:
Ba1 BB+
Ba2 BB
Ba3 BB-
B1 B+
B2 B
B3 B-
Caa1 CCC
Caa2 CC
Caa3 C
Ca CI
C D default!

Investment grade Moody’s >= Baa3, S&P/Fitch >= BBB.