Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Experian

Disclosed Oct 1, 201515,000,000 affectedConfirmed

SEC filing

Experian server breach exposes 15 million T-Mobile credit applicants

T-Mobile said its credit application vendor Experian was breached and a hacker acquired records of about 15 million individuals who applied for T-Mobile service or device financing from September 2013 to September 2015.

What is known

People affected15,000,000 (as reported by the organization)
DisclosedOct 1, 2015
HappenedApr 9, 2016
AttackVendor breach
Data exposedNamesAddressesDates of birthSocial Security numbersGovernment IDs
SectorData brokers · IE
StatusConfirmed

Sources

SEC filingsec.gov
T-Mobile US 10-Q for Q3 2015
Official noticein.gov
Indiana Attorney General 2016 data breach report: Experian

Notices filed

TotalOct 1, 2015
Research15,000,000 people
Residents of INApr 29, 2016
Indiana AG3 people

Other breaches at Experian

Breach, details not statedExposed emails, employment records, government IDs, names and phone numbers.1.3M accountsTechUnverifiedSep 1, 2020Breach, details not statedBreach notice filed with the Indiana AG, details not stated.1,158 affectedTechUSJul 21, 2014
History of this record
occurred2026-09-25
empty to 2016-04-09by backfillSource
Added2026-09-25
First recordedby seedSource

First seen 2026-09-25 (Research), confirmed by Research. Record counts are as reported. Not legal advice.

Everything about Experian