This paper adds to research on the effect of cyber events on the attacked firm’s value in light of conflicting results from previous studies. Using 536 cyberattack announcements that occurred during the 2007–2016 period, the main goal is to investigate for changes in investor reaction over time as cyberattacks have become more frequent. Empirical evidence shows that cumulative abnormal returns of attacked firms were volatile earlier in the period, became increasingly negative, but have moderated recently. This paper proposes and discusses potential explanations for this observed U-shaped pattern over the 10-year period. The relation between stock market reaction and type of attack, type of data affected, type of perpetrator and various firm level characteristics is also examined.
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The articles in the special issue investigate the management of IT risks by banks (Ashby et al. 2018), the perception of cyber risk by U.S. property casualty insurers (Pooser et al. 2018), the role of insurance in managing cyber risk, including the proposal of a cyber risk scoring tool (Shetty et al. 2018), and behavioural factors affecting perceptions of cyber risk by decision makers (de Smidt and Botzen 2018).
Following previous work, we use the daily value-weighted CRSP index to capture the market return Rm,t. Alternatively, using the daily equal-weighted index does not change the results.
The data type dummy variables for SSN, credit card information and personal information are not mutually exclusive since there are cases where all three of these types are affected and cases where none are.
The database is compiled from multiple sources of cyber-related incident records and carefully verified by the company’s research team. More importantly, Advisen Ltd. applies a rigorous quality assurance process, based both on pre-defined rules as well as manual examination to ensure a proper classification of these events. More information at https://www.advisenltd.com/data/cyber-loss-data/.
As suggested by previous studies, the following are considered confounding events: (1) mergers and acquisitions, (2) earnings/dividends announcements, (3) stock issuances and/or repurchases and (4) top executive changes.
To ensure our results of time-variant market reactions to cyber-related events are not affected by how we split the sample, we alternatively divide the sample into quartiles based on announcement dates and still find consistent evidence. These tests are available upon request.
We performed a rigorous check for confounding events for the shorter window used in the main part of this study. However, as in other long-horizon event studies, it is not practical to check for confounding events over long event windows. Therefore, the evidence reported in this analysis should be interpreted with caution. The same concern also applies to the buy-and-hold abnormal returns analysis reported in the later section.
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McShane, M., Nguyen, T. Time-varying effects of cyberattacks on firm value. Geneva Pap Risk Insur Issues Pract (2020). https://doi.org/10.1057/s41288-020-00170-x
- Cyber event study