OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has removed from under review with positive implications and upgraded the Financial Strength Rating to A+ (Superior) from A- (Excellent) and the Long-Term Issuer Credit Ratings to “aa-” from “a-” of Maxum Indemnity Company and Maxum Casualty Insurance Company (together known as the Maxum companies) (both headquartered in Alpharetta, GA). The Maxum companies were acquired by The Hartford Financial Services Group, Inc. (The Hartford) [NYSE:HIG] on July 29