MEXICO CITY–(BUSINESS WIRE)–A.M. Best has upgraded the National Scale Ratings (NSR) for 17 Mexico insurance companies following the release of the updated criteria procedure, A.M. Best Ratings on a National Scale, which is in conjunction with the release of the updated Best’s Credit Rating Methodology. The NSR has been upgraded and the positive outlook maintained for the following companies: ANA Compañía de Seguros, S.A. de C.V. — to “a-.MX” from “bb+.MX” — Previous Rating Date: Feb. 24, 20