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

Largest data breaches of 2019

The 4 data breaches first reported in 2019 with the most people affected, using official totals from the filings. Where no official total was filed, the number is the sum of state filings and is labelled "At least". 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
1 Evite, Inc.Evite, Inc. breach history 18,571,486Official total Not stated Maine AG, California AG
2 Laboratory Corporation of America HoldingsLaboratory Corporation of America Holdings breach history 10,241,756Official total
  • Social Security number
  • Medical information
  • Financial account number
  • +5 more
 Washington AG, HHS, California AG, Maine AG
3 Retrieval Masters Creditors Bureau Inc.Retrieval Masters Creditors Bureau Inc. breach history 7,651,395Official total
  • Social Security number
  • Medical information
  • Financial account number
  • +3 more
 Washington AG, Maine AG
4 Dominion Dental Services, Inc., Dominion National Insurance Company, and Dominion Dental Services USA, Inc. (hereinafter referred to collectively as “Dominion National”)Dominion Dental Services, Inc., Dominion National Insurance Company, and Dominion Dental Services USA, Inc. breach history 3,119,635Official total
  • Social Security number
  • Medical information
 Maine AG, HHS, California AG

Other years

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.