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In one of the most significant data breaches in history, Equifax, one of the largest credit reporting agencies, suffered a breach that exposed the personal information of approximately 147 million people. The breach occurred due to a vulnerability in Equifax's website software, which allowed hackers to gain access to sensitive data such as Social Security numbers, birth dates, addresses, and in some cases, driver's license numbers.

Yahoo experienced two major data breaches in 2013 and 2014, but they were only disclosed to the public in 2016 and 2017, respectively. These breaches compromised the personal information of over 3 billion Yahoo users, including names, email addresses, telephone numbers, and encrypted passwords. The breaches severely damaged Yahoo's reputation and led to a decline in its acquisition value by Verizon.