MEXICO CITY–(BUSINESS WIRE)–A.M. Best has upgraded the Mexico National Scale Rating (NSR) to a+.MX from “a.MX” and affirmed the Financial Strength Rating (FSR) of B++ (Good) and the Long-Term Issuer Credit Rating (Long-Term ICR) of “bbb” of Grupo Mexicano de Seguros S.A. de C.V. (GMX) (Mexico). The outlook of the NSR and the Long-Term ICR has been revised to positive from stable, while the outlook of the FSR remains stable. The Credit Rating (rating) actions reflect GMX’s improved underwritin