AM Best has 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+” for the members of Concord Group Insurance Companies, which is led by Concord General Mutual Insurance Company in Concord, N.H. The outlook of these credit ratings has been revised to stable from positive. Concord Group is a provider of home, auto, business and life insurance through the independent agency system.