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Aon

Disclosed May 26, 20224 years ago129,682 affectedConfirmed

Official notice

Aon, a business associate (BA) and covered entity (CE), reported that it experienced a ransomware incident that affected the protected health information (PHI) of 129,682 individuals. The PHI involved included names, dates of birth, Social Security numbers, drivers’ license numbers, health insurance information, and other treatment information. The BA/CE notified HHS, affected individuals, and the media. In response to the breach, the BA/CE offered complimentary credit monitoring and identity theft protection services and implemented additional administrative and technical safeguards. Staff were also retrained on protecting and securing PHI.

What is known

People affected129,682 (as reported to HHS)
DisclosedMay 26, 2022
DiscoveredFeb 25, 2022
HappenedMay 29, 2020
AttackHacking
Data exposedNames, Health
SectorTech · US
StatusConfirmed

Sources

Source
California Attorney General breach notice: Aonoag.ca.gov · Official notice
Washington Attorney General breach notice: Aonatg.wa.gov · Official notice
Oregon DOJ breach notice: Aonjustice.oregon.gov · Official notice
Indiana Attorney General 2022 data breach report: Aonin.gov · Official notice
HHS OCR breach report (archive, resolved): Aon (Business Associate, IL)ocrportal.hhs.gov · Official notice

Notices filed

WhereFiledPeople
California AGresidents of CAMay 26, 2022
Washington AGresidents of WAMay 26, 20226,889
Oregon DOJresidents of ORMay 26, 202231,799
HHS archivetotalMay 26, 2022129,682
Indiana AGresidents of INMay 27, 20223,080

Other breaches at Aon

BreachAffected
Disclosed Oct 13, 2015Oct 13, 201510 years ago13
History of this record
  • 2026-09-25 · data_types: [] to ["names","health"] · backfill source
  • 2026-09-25 · records_basis: organization to hhs · backfill source
  • 2026-09-25 · records: 31799 to 129682 · backfill source
  • 2026-09-25 · summary: empty to Aon, a business associate (BA) and covered entity (CE), reported that it experienced a ransomware incident that affected the protected health information (PHI) of 129,682 individuals. The PHI involved included names, dates of birth, Social · backfill source
  • 2026-09-25 · records_basis: empty to organization · backfill source
  • 2026-09-25 · records: empty to 31799 · backfill source
  • 2026-09-25 · attack: unknown to hacking · backfill source
  • 2026-09-25 · discovered: empty to 2022-02-25 · backfill source
  • 2026-09-25 · added · backfill source

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

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