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The 12 Largest U.S. Data Breaches Since 2016

Here's a look at what massive data breaches at companies like Equifax, Facebook, and Marriott meant for the company's stock price, market cap, legal and remediation costs, and executive turnover.

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Breach Blues

The biggest breaches suffered by American companies since 2016 came as the result of external cyberattacks that leveraged phishing, malware, and technical vulnerabilities.

Cloud security vendor Bitglass researched the three largest breaches of publicly traded companies in 2016, 2017 and 2018 – as well as three large breaches of government and then-private organizations – to uncover trends and learn more about the extent of the damage.

Bitglass found that an average of 257 million people were affected by each data breach, with the breaches costing companies an average of $347 million in legal fees, penalties, remediation costs, and other expenses. These enterprises on average suffered a 7.5 percent decrease in stock price after being breached, Bitglass said, leading to a mean market cap loss of $5.4 billion per company.

Here's a look at the pain and suffering data breaches have inflicted on 12 major United States companies over the past three years.

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