OLDWICK, N.J.--(BUSINESS WIRE)-- #insurance--AM Best has upgraded the Financial Strength Rating (FSR) to A (Excellent) from A- (Excellent) and the Long-Term Issuer Credit Rating (Long-Term ICR) to “a” (Excellent) from “a-” (Excellent) of Hamilton Select Insurance Inc. (Hamilton Select) (Wilmington, DE). Concurrently. AM Best has affirmed the FSR of A (Excellent) and the Long-Term ICR of “a” (Excellent) of Hamilton Re, Ltd. (Pembroke, Bermuda) and Hamilton Insurance Designated Activity Company (Dublin, Irela.