OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has removed from under review with negative implications and affirmed the Financial Strength Rating (FSR) of A (Excellent) and the Long-Term Issuer Credit Ratings (Long-Term ICR) of “a+” of Allied World Assurance Company, Ltd. (Allied World) and its operating affiliates. Concurrently, A.M. Best has removed from under review with negative implications and affirmed the Long-Term ICR of “bbb+” of the ultimate parent, Allied World Assurance Company Holdings