...OVERVIEW + On Aug. 23, 2016, we revised the outlook on Mexico to negative from stable. + As a result, we're revising our outlook on 12 Mexican financial institutions to negative from stable. + We're affirming the global and national scale ratings on these entities as well as on their senior unsecured and secured debt. + A downgrade of Mexico in the next 18-24 months could prompt a similar rating action on the global scale ratings on these financial institutions. MEXICO CITY (S&P Global Ratings) Aug. 23, 2016--S&P Global Ratings said today that it revised its long-term global scale rating outlook on 12 Mexican financial institutions (see rating list) to negative from stable, including six commercial private banks, five government-related entities (GREs), and the sole Mexican clearinghouse. At the same time, we affirmed the global and national scale issuer credit and issue-level ratings (where applicable). The outlook on the national scale ratings remains stable. The rating action on these...