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Updated: Dec 9, 2025

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Published on: November 10, 2023
COVID-19 and stock market volatility: An industry level analysis
Seungho Baek1, Sunil K Mohanty1, Mina Glambosky1
1Department of Finance, Koppelman School of Business, Brooklyn College, City University of New York (CUNY), 2900 Bedford Avenue, Brooklyn, NY 11210, USA.
Abstract:
COVID-19 has had significant impact on US stock market volatility. This study focuses on understanding the regime change from lower to higher volatility identified with a Markov Switching AR model. Utilizing machine learning feature selection methods, economic indicators are chosen to best explain changes in volatility. Results show that volatility is affected by specific economic indicators and is sensitive to COVID-19 news. Both negative and positive COVID-19 information is significant, though negative news is more impactful, suggesting a negativity bias. Significant increases in total and idiosyncratic risk are observed across all industries, while changes in systematic risk vary across industry.
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