Abstract
In the study, the relationship between Turkey's Credit Default Swaps (CDS) premiums and credit ratings of Standard and Poor's (S&P), Moody's Investors Service (Moody's) and Fitch Ratings (CRA) and the BIST ALL index listed in Borsa Istanbul and The aim is to observe their effects on each other. The universe of the study; consists of 3956 daily Turkey CDS credit risk premiums and BIST ALL data and 93 credit ratings given by CRAs in the period 2009:1–2024:4. The effect of the increase or decrease in CDS and credit scores on the closing values of the BIST ALL index was analysed with Johansen cointegration and Granger causality tests. Findings obtained in the study; Increasing the credit rating and outlook of CRAs causes an increase in BIST ALL closing values in the short term. The change in Türkiye CDS premiums triggers changes in BIST ALL closing values in the short and long term. Finally, the study concluded that the change in CDS premiums has a negative effect on BIST ALL, while the increase in credit score and outlook has a positive effect on BIST ALL.
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