Credit ratings agency AM Best has revised the outlooks of Everest Group, Ltd. and its operating subsidiaries to negative from stable, and affirmed the Financial Strength Rating (FSR) of A+ (Superior) and the Long-Term Issuer Credit Ratings (Long-Term ICR) of “aa-” (Superior).At the same time, Everest Group, Ltd. and Everest Reinsurance Holdings, Inc. (Delaware) have also received a revised outlook of negative from stable, with the affirmed Long-Term ICRs of “a-” (Excellent). Further, Everest Reinsurance Hol ...