Tamilnad Mercantile Bank Ltd announced several rating actions from various agencies, including an Issuer Rating of IND AA- with a Stable outlook assigned by India Ratings and Research (Ind-Ra), and an Issuer Rating of IND AA-; Outlook Stable assigned by India Ratings & Research Private Limited, alongside an unspecified agency assigning an Issuer Rating with further details unavailable. India Ratings and Research Private Limited reaffirmed the rating for Tier II Bonds at CARE AAA with a Stable outlook, amounting to 500 crore, while India Ratings and Research Pvt Ltd and India Ratings reported no rating data or regulatory filing notifications, and N/A indicated no rating data was found.