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Rating definitions

Financial strength rating

Standard & Poor's  
secure
AAA extremely strong
AA very strong
A strong
BBB good
Moody's  
secure
Aaa exceptional
Aa excellent
A good
Baa adequate
Fitch  
secure
AAA exceptionally strong
AA very strong
A strong
BBB good
A.M. Best  
secure
A++, A+ superior
A, A- excellent
B++, B+ good

Ratings lower than BBB, Baa or B++/B+ are considered "vulnerable" (S&P, A.M.Best and Fitch) or "weak" (Moody's).