OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has removed from under review with positive implications and upgraded the Financial Strength Rating (FSR) to A+ (Superior) from A (Excellent) and the Long-Term Issuer Credit Ratings (Long-Term ICR) to “aa-” from “a” of Endurance Specialty Insurance Ltd. (Endurance) (Bermuda) and its subsidiaries. A.M. Best also has upgraded the Long-Term ICR to “a-” from “bbb” and the Long-Term Issue Credit Ratings (Long-Term IR) of its immediate parent, Endurance Speci