OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has revised the outlook to positive from stable for the Long-Term Issuer Credit Rating (Long-Term ICR) and affirmed the Financial Strength Rating (FSR) of A (Excellent) and the Long-Term ICRs of “a” of Grinnell Mutual Reinsurance Company and its subsidiary Grinnell Select Insurance Company (both are domiciled in Grinnell, IA), which are collectively referred to as Grinnell Mutual Group (Grinnell). The outlook of the FSR remains stable. The ratings refle
