The study aims to identify volatility in the banking sector and general market related to some different types of announcements. Totally 103 announcements are clustered considering their sentiment and source. Daily closing values of banking and market indices, XBANK and BIST100, are included in the dataset which spans from the beginning of January 2018 to the end of March 2019. Series of ordinary least squares (OLS) regressions are applied to evaluate the reaction of the indices to the announcements for each event type. Findings indicate that the banking sector is not affected by the announcements released by the government. Announcements of credit rating agencies carry an informative value and play an important role in volatility. Furthermore, the relationship between economic indicators and volatility exists for the national market. As an interesting finding, investors tend to react 2 days before to the announcements belonging to Standard & Poor's and Fitch.