Companies’ Stock Value Dropped 7.5% after Data Breaches After analyzing the top three breaches from the past three years, Bitglass found that in the aftermath of a data breach, a decrease in stock price was a notable repercussion identifiable for publicly traded companies. The report, Kings of the Monster Breaches, identified the extensive damage done by improper security by looking specifically at the Marriott breach of 2018, the Equifax breach of 2017 and the Yahoo!

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