BreachCensus

Aon Plc

InsuranceUnited States of America

Aon Plc is an insurance organisation in United States of America. It appears on the Massachusetts Attorney General breach-notification register, the California Attorney General breach-notification register and the Washington State Attorney General breach-notification register with 3 confirmed incidents (4 filings); the most recent notice was filed on May 26, 2022.

Data as of September 6, 2026.

Confirmed incident

Filed in CA, WA and MA

The same incident was filed separately with 3 jurisdictions within a few days of each other (CA, WA and MA) — shown here as one incident.

Occurred
May 29, 2020
Disclosed
May 26, 2022

Timeline

  1. May 26, 2022
    Reported to regulator Regulator

    WA AG breach notification: 6,889 Washington residents affected

    source
  2. May 26, 2022
    Reported to regulator Regulator

    CA AG breach notification: an unknown number of California residents affected

    source
  3. May 26, 2022
    Reported to regulator Regulator

    MA AG breach notification: 648 Massachusetts residents affected

    source
What a California notice means

Required under Cal. Civ. Code §1798.82. A copy of the notification must be sent to the Attorney General when a single breach requires notifying more than 500 California residents.

Note: no affected-count is published on this register.

California breach-notification register ↗

What a Washington notice means

Required under RCW 19.255.010. Notice to the Attorney General is required when a breach affects more than 500 Washington residents.

Note: the count is Washington residents only, not a total.

Washington breach-notification register ↗

What a Massachusetts notice means

Required under M.G.L. c. 93H. Notice to the Attorney General is required for a breach affecting any number of Massachusetts residents' personal information -- the statute sets no minimum count.

Note: the count is Massachusetts residents only, not a total.

Massachusetts breach-notification register ↗

Unverified claim

US — Ransomware Attack

This is an unverified claim — it has allegedly happened to this organisation, as posted by a source below, but has not been confirmed by a regulator, a court filing or the organisation’s own disclosure.

Timeline

  1. June 16, 2023
    Claimed by threat actor (unverified) Claim

    Ransomware leak-site claim (ransomware_live)

    source
Unverified claim

US — Ransomware Attack

This is an unverified claim — it has allegedly happened to this organisation, as posted by a source below, but has not been confirmed by a regulator, a court filing or the organisation’s own disclosure.

Timeline

  1. July 3, 2022
    Claimed by threat actor (unverified) Claim

    Ransomware leak-site claim (ransomware_live)

    source