A recent study discovered that the stock value of 28 companies affected by large data breaches has not performed as well as they might have otherwise. The study lasted several years and determined that the flow of stock prices for these breached companies has been impacted negatively. The total effect for each company ranges from moderate to minimal.

The study was conducted by the research team that stands behind the CompariTech web portal. They only looked at companies that were listed on the New York Stock Exchange (NYSE) and also publicly admitted to very large data breaches. The final criterion was that these breaches occurred within the past three years.

The research team put 28 companies on the list. This includes household names such as Anthem, Experian, Apple, Community Health Systems, Adobe, Dun & Bradstreet, eBay, Global Payments, Home Depot, JP Morgan Chase, Heartland Payment Systems, Health Net, LinkedIn, T-Mobile, Monster, Staples, Sony, TJ Maxx, Target, Under Armour, Yahoo, T-Mobile and Vodafone.