AM Best Affirms Credit Ratings of Chubb Limited and Its Subsidiaries - Seite 3 AM Best has affirmed the Financial Strength Rating (FSR) of A++ (Superior) and the Long-Term Issuer Credit Ratings (Long-Term ICR) of "aa+" (Superior) of the grouped subsidiaries of Chubb Limited (Chubb) (Zurich, Switzerland) [NYSE: CB]. These …