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Confirmed breach

OSI Systems data breach

USUnited States · CA · OSI Systems, Inc.

OSI Systems (CA, United States) notified the Texas Attorney General, the Indiana Attorney General, the California Attorney General and the Washington Attorney General of a data breach on 11 March 2026. It affected 4,910 people. Exposed: Social Security numbers, Names and Addresses. The breach began on 23 December 2025, 78 days before it was reported.

Status
Confirmed breach
People affected
4,910 people
Reported
11 March 2026
Breach began
23 December 2025
Time to tell
78 days (the median in California’s notices over the last year: 154 days)

What was exposed

  • Social Security numbers
  • Names
  • Addresses

Before the notice: the ransomware gang INC Ransom named OSI Systems on its leak site on 30 December 2025, 71 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, 4,910 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 Texas, Indiana, California, Washington. · Corrections and changes

If OSI Systems had your data

  1. Look for OSI Systems, Inc.’s own notice or letter: it should say what of yours was involved. Keep it.
  2. 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.
  3. Expect scams that use your details: calls, texts or emails pretending to be OSI Systems, 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.

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  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.