Arı, YakupYelgen, EsinUçak, Harun2026-01-242026-01-24202297817998911929781799891178https://doi.org/10.4018/978-1-7998-9117-8.ch009https://hdl.handle.net/20.500.12868/4718The aim of this study is to examine the volatility spillover between bitcoin and Turkish financial markets for the pre-COVID-19 and COVID-19 periods. Using GARCHbased volatility spillover indices, the authors find that BTC-USD was a volatility transmitter in the pre-COVID-19 period but has become the main volatility receiver in the COVID-19 period, and its net volatility transmission fell from 0.7% to -10.84%. Moreover, they concluded that the total spillover index increased from 12.49% to 15.25% indicates a low connectedness between the markets in both periods and the error variance in markets is on average 15.25% originated from other markets in the COVID-19 period. © 2021, IGI Global.eninfo:eu-repo/semantics/closedAccessBook Chapter10.4018/978-1-7998-9117-8.ch0091411652-s2.0-85137101131N/A