Independent public-records tracker. Not a government website.Facts from official state, HHS and SEC filings
BreachRecord

Data breaches that exposed tax id numbers

Data breaches whose official filings or notice letters list tax id numbers among the information involved: 4 breaches, newest first. Facts come from official filings with US state attorneys general, the U.S. Department of Health and Human Services (HHS) and the SEC; each breach page links its sources.

Updated Oct 21, 2026 · Showing 1–4 of 4

Organization First filed People affected Information exposed Filed with
SM Energy CompanySM Energy Company breach history 40,109
  • Social Security number
  • Tax ID number
  • Name
  • +4 more
 California AG, Texas AG
Kubota North America CorporationKubota North America Corporation breach history 5,891
  • Social Security number
  • Medical information
  • Driver's license
  • +8 more
 California AG, Texas AG
Blank Rome LLPBlank Rome LLP breach history 57,554
  • Social Security number
  • Medical information
  • Driver's license
  • +11 more
 Texas AG, California AG
AssuranceAmerica Managing General Agency, LLCAssuranceAmerica Managing General Agency, LLC breach history 6,998,886
  • Social Security number
  • Driver's license
  • Financial account number
  • +4 more
 Washington AG, California AG, Texas AG

People affected is the official total from a filing, or “At least” the sum of state filings where no total was filed. Spotted an error? Report a correction.