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Related Experiment Video

Updated: Oct 15, 2025

Author Spotlight: Advancements in Multiplex Detection of Respiratory Viruses

Author Spotlight: Advancements in Multiplex Detection of Respiratory Viruses

Published on: November 10, 2023

Covid-19: Corporate diversification and post-crash returns.

Yerzhan Tokbolat¹, Hang Le²

¹Queen's Management School, Belfast, BT9 5EE, UK.

Finance Research Letters

|October 25, 2021

Summary

Corporate diversification negatively impacted stock returns during the Covid-19 crash. However, diversified firms with a premium showed better performance and faster recovery than those at a discount.

Keywords:

Covid-19 corporate diversification excess value stock market crash survival analysis

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Area of Science:

Finance
Economics
Business Strategy

Background:

The Covid-19 pandemic caused a significant market crash, impacting corporate performance.
Corporate diversification strategies are common, but their effectiveness during crises is debated.

Purpose of the Study:

To investigate the effect of corporate diversification on stock returns during and after the Covid-19 market crash.
To analyze how diversification premium or discount influences firm performance in crisis situations.

Main Methods:

Regression analysis to assess the relationship between diversification and stock returns.
Survival analysis to evaluate the speed of stock price recovery.

Main Results:

Diversified firms generally underperformed focused firms, exhibiting worse stock returns and slower recovery.
Firms trading at a diversification premium demonstrated superior returns and quicker recovery compared to those at a discount.

Conclusions:

Corporate diversification can be a liability during market downturns like the Covid-19 crash.
The market valuation of diversification (premium vs. discount) significantly moderates its impact on stock performance during crises.