Fitch Ratings has downgraded the support-driven Long-Term Issuer Default Ratings (IDRs) of Komercni Banka (KB) to 'A-' from 'A' as a result of the downgrade KB's ultimate parents', Societe Generale (SG), Long-Term IDRs to 'A'/Stable from 'A+'/Negative. The downgrades of the subsidiaries reflect Fitch's view of the parents' weakened ability to provide support, in case of need. /slightly NEGATIVE, nevetheless could have been expected after SG downgrade.