MEXICO CITY--(BUSINESS WIRE)--A.M. Best has upgraded the financial strength rating to A (Excellent) from A- (Excellent) and the issuer credit rating to “a” from “a-” of Barents Re Reinsurance Company Inc. (Barents Re) (Panama City, Panama). The outlook for both ratings was revised to stable from positive. The upgrade reflects Barents Re’s strong operating performance registered as the company achieved its geographic diversification goals and maintained conservative retention levels supported by