Cybersecurity breaches may be correlated due to geography, similar infrastructure, or use of a third-party contractor. We show how a copula model may be used to estimate the probability of an attack where breaches may be correlated among firms. Losses arising from cybersecurity breaches have an...

Stock market reactions to cybersecurity breach announcements are generally negative. In virtually all cases, information asymmetry exists between firm management and investors between the date of cybersecurity breach discovery and the public announcement of the breach. We find significant...