In re Trans Union, LLC, Customer Data Security Breach Litigation
ActiveMDL No. 3170 · N.D. Illinois · consolidated December 2025
- Breach
July 2025 · 4,461,511 people
- Cases at transfer
54, in five federal districts
The Judicial Panel on Multidistrict Litigation sent the lawsuits over the 2025 breach to the Northern District of Illinois on December 16, 2025. The panel's order describes a social-engineering attack on TransUnion's own Salesforce environment, not a flaw in Salesforce itself.


















