AM Best has upgraded the Long-Term Issuer Credit Ratings [Long-Term ICR] to “aa” [Superior] from “aa-” [Superior] and affirmed the Financial Strength Rating [FSR] of A+ [Superior] of Arch Reinsurance Ltd. [Arch] [Bermuda] and its strategic affiliates. The outlook of the Long-Term ICRs has been revised to stable from positive, while the outlook of the […]