When a company experiences a data breach, the financial impacts of the compromise can be detrimental. Share prices are estimated to fall 3.5% within four months, and 8.6% after a year. But which global companies have experienced the most expensive data breaches? Recently, the team at Proxyrack conducted a study to look into the most costly data breaches, the most common methods, and the companies with the most data breaches to reveal the most exposed industries.