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Confirmed breach

Mercer Advisors data breach

USUnited States · CO · Mercer Advisors Inc.

Mercer Advisors (CO, United States) notified the Oregon Department of Justice, the Texas Attorney General, the Indiana Attorney General, the California Attorney General and the Washington Attorney General of a data breach on 31 March 2026. It affected 143,104 people. Exposed: Social Security numbers, Government ID numbers, Health and medical information, Financial account and card details, Dates of birth and Names and more. The breach began on 1 January 2026, 89 days before it was reported.

Status
Confirmed breach
People affected
143,104 people
Reported
31 March 2026
Breach began
1 January 2026
Time to tell
89 days (the median in California’s notices over the last year: 154 days)

What was exposed

  • Social Security numbers
  • Government ID numbers
  • Health and medical information
  • Financial account and card details
  • Dates of birth
  • Names
  • Addresses

Before the notice: the ransomware gang Shinyhunters named Mercer Advisors on its leak site on 24 February 2026, 35 days before this was reported. Matched by the organisation’s name: the notice itself does not say who the attacker was.

What changed since it was first reported

  1. Confirmed breach, 15,486 Texas residents (Texas Attorney General)
  2. Confirmed breach, 143,104 people (Indiana Attorney General)

What the letter says

We have not read this letter yet.

Got a letter or email about this breach? Check it is real →

Read the letter (PDF), as filed with the California Attorney General.

Sources

Official notices are read by code from the regulator’s own register. More notices to Oregon, Texas, Indiana, California, Washington. · Corrections and changes

If Mercer Advisors had your data

  1. Look for Mercer Advisors Inc.’s own notice or letter: it should say what of yours was involved. Keep it.
  2. Call your bank on the number printed on your card (never one from a message), check recent payments and ask for a new card.
  3. An ID number cannot be changed, so lock it: a credit freeze or fraud alert in the US, a credit warning (kreditadvarsel) on borger.dk in Denmark, Cifas protective registration in the UK.
  4. Check your health insurer’s statements for treatment you never had.
  5. Expect scams that use your details: calls, texts or emails pretending to be Mercer Advisors Inc., your bank or the police. Never give codes or passwords, never approve a sign-in you did not start, never move money.

One email to confirm first. We use your address only for this alert, and one click deletes it.

More breaches in United States

  1. Quantum HealthUSUnited States · OH · 28 October 2026 Social Security numbersHealth insurance detailsHealth and medical information+1 273.1KTexas residents
  2. Indico Data SolutionsUSUnited States · MA · 28 October 2026 Social Security numbersDriver’s license numbersGovernment ID numbers+6 2.1KTexas residents
  3. Apollo Asset ManagementUSUnited States · NY · 28 October 2026 Social Security numbersDriver’s license numbersGovernment ID numbers+3 1.5KTexas residents
  4. DBA Tanya AlexanderUSUnited States · TX · 28 October 2026 NamesAddresses 417Texas residents
  5. DMW Retail Enterprises LLC dba Kult of Athena (KOA)USUnited States · IL · 28 October 2026 Financial account and card detailsNames 306Texas residents

Every breach in United States →

From the data breach tracker: official notices, breach databases and the news, every fact with its source. Open data (CC BY 4.0) · How the tracker works · Official registers · Corrections and changes · Found a mistake? Tell us and we correct it.