Post-Breach Share Prices Plummet Below NASDAQ Average

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When it comes to the business impact of data breaches, companies that have suffered a compromise of at least 1 million records average suffered an immediate post-breach decrease in share price of 0.43%, about equal to their average daily volatility. The security and privacy advice and comparison website, Comparitech.com, looked at the closing share prices of 24 companies, including Apple, Adobe, Anthem, BetFair, Countrywide, Community Health Systems, Dun & Bradstreet, eBay, Experian, Global Payments, Home Depot, Health Net, Heartland Payment Systems, JP Morgan Chase, LinkedIn, Monster, T-Mobile, Sony, Staples, Target, TJ Maxx, Vodafone, VTech and Yahoo.

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