Everest Group Begins Leaking Alleged Liberty Mutual Data

Fraud Management & Cybercrime , Ransomware Everest Group Begins Leaking Alleged Liberty Mutual Data Cybercrime Gang Claims to Have 108-Gbyte Trove of Insurer's Files, Folders Marianne Kolbasuk McGee (HealthInfoSec) • May 4, 2026     Share Post Share Credit Eligible Get Permission Everest Group claims it stole more than 108 gigabytes of data from insurer Liberty Mutual. The company said it is investigating a possible incident at a third-party vendor. (Image: Liberty Mutual) Ransomware gang Everest Group on Monday began leaking what it claims to be a 108 gigabyte trove of data stolen on April 30 from insurance underwriter Liberty Mutual. See Also: AI Pushes Cyberattacks to New Speed Levels The cybercrime group late Monday afternoon published the data after claiming the insurer "failed" to respond to the its demands. "After the full publication, all the data was duplicated across various hacker forums and leak database sites," Everest said on its dark website. Liberty Mutual in a statement acknowledged the claims, saying the Boston company is investigating the matter, which it said appears to involve an incident at a third-party vendor. "We are aware of and immediately launched an investigation into online allegations regarding a data incident at Liberty Mutual," the company said. "Our current review does not indicate a compromise of Liberty Mutual systems or networks." Policyholder information, including customer names, addresses, policy numbers and financial and insurance details, is among the tens-of-thousands of Liberty Mutual files and folders Everest claimed it stole. Liberty Mutual reported net revenue of nearly $50.5 billion in 2025. On its website, Liberty Mutual describes itself as a Fortune 100 company with more than 40,000 employees in 27 countries, ranking as the ninth largest global property and casualty insurer.