OLDWICK, N.J.--(BUSINESS WIRE)--A.M. Best has affirmed the financial strength rating of A (Excellent) and the issuer credit rating of “a+” of MS Frontier Reinsurance Limited (MS Frontier) (Hamilton, Bermuda). The outlook for both ratings is stable. MS Frontier is a wholly owned subsidiary of Mitsui Sumitomo Insurance Company, Limited (MSI), which is a subsidiary of MS&AD Insurance Group Holdings, Inc. (MS&AD) (both domiciled in Japan). The ratings reflect MS Frontier’s overall positive


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