US Office of Personnel Management
Disclosed Jun 4, 201511 years ago4,200,000 affectedConfirmed
OPM personnel records of 4.2 million federal employees stolen
OPM discovered that personnel data of 4.2 million current and former federal employees, including names, birth dates, home addresses and Social Security numbers, had been stolen.
What is known
| People affected | 4,200,000 (as reported by the organization) |
|---|---|
| Disclosed | Jun 4, 2015 |
| Attack | Hacking |
| Data exposed | Names, Dates of birth, Addresses, Social Security numbers, Employment |
| Sector | Government · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| OPM: Cybersecurity Incidentsweb.archive.org · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| Researchtotal | Jun 4, 2015 | 4,200,000 |
Other breaches at US Office of Personnel Management
| Breach | Affected | ||||
|---|---|---|---|---|---|
| Background investigation files of 21.5 million people stolen from OPMJul 9, 201511 years agoHacking | Jul 9, 201511 years ago | Hacking | Government | Confirmed | 22M |
History of this record
- 2026-09-25 · added · seed source
First seen 2026-09-25 (Research), confirmed by Research. Record counts are as reported. Not legal advice.