| Aa1 |
AA+ |
High Grade - Investment Grade |
| Aa2 |
AA |
High Grade - Investment Grade |
| Aa3 |
AA- |
High Grade - Investment Grade |
| A1 |
A+ |
Upper Medium Grade - Investment Grade |
| A2 |
A |
Upper Medium Grade - Investment Grade |
| A3 |
A- |
Upper Medium Grade - Investment Grade |
| Baa1 |
BBB+ |
Lower Medium Grade - Investment Grade |
| Baa2 |
BBB |
Lower Medium Grade - Investment Grade |
| Baa3 |
BBB- |
Lower Medium Grade - Investment Grade |
| Ba1 |
BB+ |
Non-Investment Grade - Speculative |
| Ba2 |
BB |
Non-Investment Grade - Speculative |
| Ba3 |
BB- |
Non-Investment Grade - Speculative |