“…The determination of volatility spread and testing of volatility models in indices within Borsa Istanbul have become widespread especially since the 2000s, and Borsa Istanbul 100 Index volatility has an ARCH effect (Doğanay, 2003;Duran & Şahin, 2006;Akgün & Sayyan (2007); Sevüktekin & Nargeleçekenler, 2006;Atakan, 2009). After the 2008 financial crisis, studies testing the effects of volatility on Borsa Istanbul Stock Exchange with the help of GARCH models have increased significantly (Tülin, 2009, Çağıl & Okur, 2010Yorulmaz & Ekici, 2010;Güriş & Saçıldı, 2011;Demir & Çene, 2012;Evlimoğlu & Çondur, 2012;Çukur et al 2012;Kutlar & Torun, 2013;Er & Fidan, 2013;Samırkaş & Düzakın, 2013;Demirhan, 2013;Demirgil & Gök, 2014;Karabacak et al 2014;Gürsoy & Balaban, 2014;Gökbulut & Pekkaya, 2014;Eryılmaz, 2015, McMillan et al 2016Kırkulak & Ezzat, 2017, Baykut & Kula, 2018Kocabaş, 2019,). In addition to GARCH models, the EGARCH model can estimate volatility, taking into account the asymmetry of the shocks.…”