August 12 (SeeNews) - The main equity indices of the Zagreb Stock Exchange (ZSE) closed lower on Thursday for a second straight session due to a drop in the shares of holding company Adris [ZSE:ADRS2], hotel operator Valamar Riviera [ZSE: RIVP] and fast-moving consumer goods distributor Atlantic Grupa [ZSE:ATGR], bourse data showed.