AM Best has affirmed the Financial Strength Rating [FSR] of A+ [Superior] and the Long-Term Issuer Credit Ratings of “aa-” [Superior] of the operating subsidiaries of Everest Group, Ltd. [Bermuda]. The ratings agency said, “Concurrently, AM Best has affirmed the Long-Term ICRs of “a-” [Excellent] of Everest Group, Ltd. and Everest Reinsurance Holdings, Inc. [Delaware]. …