Real-life caseFebruary 2017, older case
Verizon and Yahoo, United States
In July 2016, Verizon signed an agreement to buy Yahoo's internet business. Yahoo then revealed two massive leaks: more than a billion accounts in 2013, 500 million in 2014.
The two sides renegotiated. In February 2017, the price was cut by 350 million dollars, to around 4.48 billion. Yahoo also remained liable for part of the costs of investigations and lawsuits linked to the leaks.
The risk has not gone away. In an FTI Consulting survey published in March 2026, 42% of the executives of large US companies surveyed had seen the value of a deal drop sharply after a cyber incident (FTI Consulting (opens in a new tab)).
Read the sourceVerizon, Yahoo! renegotiate acquisition agreement — Lightwave (opens in a new tab)