Please use this identifier to cite or link to this item: http://hdl.handle.net/10125/64783

Digital Insiders and Informed Trading before Earnings Announcements

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Title:Digital Insiders and Informed Trading before Earnings Announcements
Authors:Naomi Soderstrom
Henk Berkman
Gladys Lee
Jonathan Jona
Keywords:liquidity
cybersecurity
cyber risk disclosure
adverse selection
bid ask spread
show 7 moreprobability of informed trading
private information
hacking
cyber risk mitigation
price jump ratio
textual analysis
short selling
show less
Date Issued:13 Jun 2019
Abstract:We use firm-specific measures of cybersecurity risk mitigation based on textual analysis of 10-Ks to proxy for the probability of trading with digital insiders – hackers who target corporations to obtain non-public corporate information for illegal trading. We find that prior to earnings announcements, a larger share of new earnings information is already incorporated into prices for firms with low cybersecurity risk mitigation scores. We also find that pre-announcement trading by short sellers is more predictive of earnings surprises for firms with low cybersecurity risk mitigation. Further, on days closer to earnings announcements, firms with relatively low cybersecurity risk mitigation scores experience a larger increase in bid-ask spreads, particularly the adverse selection component. These results suggest that weak cybersecurity risk mitigation provides opportunities for acquisition of private information and that trading by privately informed traders is more likely in stocks of firms with higher exposure to cybercrimes.
URI:http://hdl.handle.net/10125/64783
Appears in Collections: 07 Financial: Disclosure


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