DisclosureLens
UnknownOtherGovernment IDCritical

TransUnion

bd_83b605646965217d · schema v1 · pii pii-v1

Severity

Critical

Discovered

Jul 29, 2025

Filed

Sep 4, 2025

To disclose

5 weeks

Affected · nationwide

4,461,511377,357 in this filing

Linked

5 filings

Confidence

95%
Full breach record for TransUnion →13 incidents on file

TransUnion LLC based in Chicago, Illinois, a other entity reported a data breach to the Texas Attorney General. The breach was discovered on 2025-07-29 and reported on 2025-09-04. 377,357 Texas residents were affected. 4,461,511 individuals affected in total. Types of information involved: Social Security Number Information. Consumers were notified via U.S. Mail.

Leak gap clock⏱ Leak >30d5 weeks discovery → filing
⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 1 days
discovery → filing · ≤ 5 weeks / 37 days

Jul 28, 2025

Begins

Jul 29, 2025

Discovered

Sep 4, 2025

Filed

vs. sector median

3 wks faster

This filing is one of 5 about the same incident.View merged incident
A leak claim by shinyhunters about this victim predates this filing by 68 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Regulatory filings (3) · sorted by filing gap

Filing propagation · 4 filings · 4 states

View merged incident ↗
New Hampshire State AGSep 4 · first
South Carolina State AGSep 4 · first
Massachusetts State AGSep 4 · first
Texas State AGSep 4 · first · this page

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.