OLDWICK, N.J.--(BUSINESS WIRE)--A.M. Best has affirmed the financial strength rating (FSR) of A+ (Superior) and the issuer credit ratings (ICR) of “aa-” of Arch Reinsurance Ltd. (Arch) (Bermuda) and its strategic affiliates. A.M. Best also has upgraded the ICR to “a-” from “bbb+” of Arch Capital Group (US) Inc. (Delaware). Concurrently, A.M. Best has affirmed the ICR of “a-” as well as all issue ratings of the ultimate holding company, Arch Capital Group Ltd (Arch Capital) (Bermuda) [NASDAQ: AC


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